1 Version 1.62.0 (2022-06-30)
2 ==========================
7 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
8 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
9 - [Fix constants not getting dropped if part of a diverging expression][94775]
10 - [Support unit struct/enum variant in destructuring assignment][95380]
11 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
16 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
17 - [Make `unaligned_references` lint deny-by-default][95372]
18 This lint is also a future compatibility lint, and is expected to eventually
20 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
21 - [Reject `#[thread_local]` attribute on non-static items][95006]
22 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
23 - [Implement a lint to warn about unused macro rules][96150]
24 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
26 \* Refer to Rust's [platform support page][platform-support-doc] for more
27 information on Rust's tiered platform support.
32 - [Windows: Use a pipe relay for chaining pipes][95841]
33 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
34 - [Replace RwLock by a futex based one on Linux][95801]
35 - [std: directly use pthread in UNIX parker implementation][96393]
44 - [`windows::CommandExt::raw_arg`]
45 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
46 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
47 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
48 - [`FusedIterator for EncodeWide`]
49 - [RDM intrinsics on aarch64][stdarch/1285]
54 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
59 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
61 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
62 - Package ID specs now support `name@version` syntax in addition to the
63 previous `name:version` to align with the behavior in `cargo add` and other
64 tools. `cargo install` and `cargo yank` also now support this syntax so the
65 version does not need to passed as a separate flag.
66 - The `git` and `registry` directories in Cargo's home directory (usually
67 `~/.cargo`) are now marked as cache directories so that they are not
68 included in backups or content indexing (on Windows).
69 - Added automatic `@` argfile support, which will use "response files" if the
70 command-line to `rustc` exceeds the operating system's limit.
75 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
76 the same as the host target.
77 [#10594](https://github.com/rust-lang/cargo/pull/10594)
78 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
79 - [rustdoc: Remove .woff font files][96279]
80 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
81 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
82 complete synchronously][95469].
87 - [Unify ReentrantMutex implementations across all platforms][96042]
89 These changes provide no direct user facing benefits, but represent significant
90 improvements to the internals and overall performance of rustc
93 [93313]: https://github.com/rust-lang/rust/pull/93313/
94 [93969]: https://github.com/rust-lang/rust/pull/93969/
95 [94206]: https://github.com/rust-lang/rust/pull/94206/
96 [94457]: https://github.com/rust-lang/rust/pull/94457/
97 [94775]: https://github.com/rust-lang/rust/pull/94775/
98 [94872]: https://github.com/rust-lang/rust/pull/94872/
99 [95006]: https://github.com/rust-lang/rust/pull/95006/
100 [95035]: https://github.com/rust-lang/rust/pull/95035/
101 [95372]: https://github.com/rust-lang/rust/pull/95372/
102 [95380]: https://github.com/rust-lang/rust/pull/95380/
103 [95431]: https://github.com/rust-lang/rust/pull/95431/
104 [95469]: https://github.com/rust-lang/rust/pull/95469/
105 [95705]: https://github.com/rust-lang/rust/pull/95705/
106 [95801]: https://github.com/rust-lang/rust/pull/95801/
107 [95819]: https://github.com/rust-lang/rust/pull/95819/
108 [95841]: https://github.com/rust-lang/rust/pull/95841/
109 [96042]: https://github.com/rust-lang/rust/pull/96042/
110 [96150]: https://github.com/rust-lang/rust/pull/96150/
111 [96268]: https://github.com/rust-lang/rust/pull/96268/
112 [96279]: https://github.com/rust-lang/rust/pull/96279/
113 [96393]: https://github.com/rust-lang/rust/pull/96393/
114 [96436]: https://github.com/rust-lang/rust/pull/96436/
115 [96557]: https://github.com/rust-lang/rust/pull/96557/
116 [96630]: https://github.com/rust-lang/rust/pull/96630/
118 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
119 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
120 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
121 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
122 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
123 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
124 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
125 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
126 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
127 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
129 Version 1.61.0 (2022-05-19)
130 ==========================
135 - [`const fn` signatures can now include generic trait bounds][93827]
136 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
137 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
138 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
143 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
144 - [The `char` type is now described as UTF-32 in debuginfo][89887]
145 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
146 - X86 [`#[target_feature = "adx"]` is now stable][93745]
151 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
152 - [`#[ignore = "…"]` messages are printed when running tests][92714]
153 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
154 - [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users.
155 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
156 - [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4.
161 - [`Pin::static_mut`]
162 - [`Pin::static_ref`]
163 - [`Vec::retain_mut`]
164 - [`VecDeque::retain_mut`]
165 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
166 - [`std::os::unix::net::SocketAddr::from_pathname`]
167 - [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes.
168 - [`std::thread::JoinHandle::is_finished`]
170 These APIs are now usable in const contexts:
172 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
173 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
174 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
175 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
176 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
177 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
178 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
179 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
180 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
185 No feature changes, but see compatibility notes.
190 - Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to
191 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
192 - (less common) or be updated to use the [`+whole-archive`] modifier.
193 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
194 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
195 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
196 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
197 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
198 - [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`.
199 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
204 These changes provide no direct user facing benefits, but represent significant
205 improvements to the internals and overall performance of rustc
208 - [debuginfo: Refactor debuginfo generation for types][94261]
209 - [Remove the everybody loops pass][93913]
211 [88375]: https://github.com/rust-lang/rust/pull/88375/
212 [89887]: https://github.com/rust-lang/rust/pull/89887/
213 [90621]: https://github.com/rust-lang/rust/pull/90621/
214 [92285]: https://github.com/rust-lang/rust/pull/92285/
215 [92472]: https://github.com/rust-lang/rust/pull/92472/
216 [92697]: https://github.com/rust-lang/rust/pull/92697/
217 [92714]: https://github.com/rust-lang/rust/pull/92714/
218 [92911]: https://github.com/rust-lang/rust/pull/92911/
219 [93263]: https://github.com/rust-lang/rust/pull/93263/
220 [93745]: https://github.com/rust-lang/rust/pull/93745/
221 [93827]: https://github.com/rust-lang/rust/pull/93827/
222 [93901]: https://github.com/rust-lang/rust/pull/93901/
223 [93913]: https://github.com/rust-lang/rust/pull/93913/
224 [93965]: https://github.com/rust-lang/rust/pull/93965/
225 [94081]: https://github.com/rust-lang/rust/pull/94081/
226 [94261]: https://github.com/rust-lang/rust/pull/94261/
227 [94295]: https://github.com/rust-lang/rust/pull/94295/
228 [94832]: https://github.com/rust-lang/rust/pull/94832/
229 [95016]: https://github.com/rust-lang/rust/pull/95016/
230 [95251]: https://github.com/rust-lang/rust/pull/95251/
231 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
232 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
233 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
234 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
235 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
236 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
237 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
238 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
239 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
240 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
241 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
242 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
243 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
244 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
245 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
246 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
247 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
248 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
249 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
250 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
251 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
252 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
255 Version 1.60.0 (2022-04-07)
256 ==========================
260 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
261 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
265 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
266 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
267 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
268 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
269 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
270 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
271 - [Fix invalid removal of newlines from doc comments][92357]
272 - [Add kernel target for RustyHermit][92670]
273 - [Deny mixing bin crate type with lib crate types][92933]
274 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
275 - [Upgrade to LLVM 14][93577]
277 \* Refer to Rust's [platform support page][platform-support-doc] for more
278 information on Rust's tiered platform support.
282 - [Guarantee call order for `sort_by_cached_key`][89621]
283 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
284 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
285 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
286 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
290 - [`Arc::new_cyclic`][arc_new_cyclic]
291 - [`Rc::new_cyclic`][rc_new_cyclic]
292 - [`slice::EscapeAscii`][slice_escape_ascii]
293 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
294 - [`u8::escape_ascii`][u8_escape_ascii]
295 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
296 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
297 - [`MaybeUninit::assume_init_read`][assume_init_read]
298 - [`i8::abs_diff`][i8_abs_diff]
299 - [`i16::abs_diff`][i16_abs_diff]
300 - [`i32::abs_diff`][i32_abs_diff]
301 - [`i64::abs_diff`][i64_abs_diff]
302 - [`i128::abs_diff`][i128_abs_diff]
303 - [`isize::abs_diff`][isize_abs_diff]
304 - [`u8::abs_diff`][u8_abs_diff]
305 - [`u16::abs_diff`][u16_abs_diff]
306 - [`u32::abs_diff`][u32_abs_diff]
307 - [`u64::abs_diff`][u64_abs_diff]
308 - [`u128::abs_diff`][u128_abs_diff]
309 - [`usize::abs_diff`][usize_abs_diff]
310 - [`Display for io::ErrorKind`][display_error_kind]
311 - [`From<u8> for ExitCode`][from_u8_exit_code]
312 - [`Not for !` (the "never" type)][not_never]
313 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
314 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
318 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
319 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
320 - [Stabilize namespaced and weak dependency features.][cargo/10269]
321 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
322 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
326 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
327 - [Drop rustc-docs from complete profile][93742]
328 - [bootstrap: tidy up flag handling for llvm build][93918]
332 - [Remove compiler-rt linking hack on Android][83822]
333 - [Mitigations for platforms with non-monotonic clocks have been removed from
334 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
335 instant is not guaranteed to be greater than an earlier instant anymore.
336 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
337 saturating to `0` instead][89926]. In the real world the panic happened mostly
338 on platforms with buggy monotonic clock implementations rather than catching
339 programming errors like reversing the start and end times. Such programming
340 errors will now results in `0` rather than a panic.
341 - In a future release we're planning to increase the baseline requirements for
342 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
343 your feedback in [PR #95026][95026].
348 These changes provide no direct user facing benefits, but represent significant
349 improvements to the internals and overall performance of rustc
352 - [Switch all libraries to the 2021 edition][92068]
354 [83822]: https://github.com/rust-lang/rust/pull/83822
355 [86374]: https://github.com/rust-lang/rust/pull/86374
356 [87487]: https://github.com/rust-lang/rust/pull/87487
357 [89621]: https://github.com/rust-lang/rust/pull/89621
358 [89926]: https://github.com/rust-lang/rust/pull/89926
359 [90132]: https://github.com/rust-lang/rust/pull/90132
360 [90247]: https://github.com/rust-lang/rust/pull/90247
361 [91606]: https://github.com/rust-lang/rust/pull/91606
362 [92068]: https://github.com/rust-lang/rust/pull/92068
363 [92300]: https://github.com/rust-lang/rust/pull/92300
364 [92357]: https://github.com/rust-lang/rust/pull/92357
365 [92383]: https://github.com/rust-lang/rust/pull/92383
366 [92630]: https://github.com/rust-lang/rust/pull/92630
367 [92670]: https://github.com/rust-lang/rust/pull/92670
368 [92800]: https://github.com/rust-lang/rust/pull/92800
369 [92933]: https://github.com/rust-lang/rust/pull/92933
370 [93566]: https://github.com/rust-lang/rust/pull/93566
371 [93577]: https://github.com/rust-lang/rust/pull/93577
372 [93658]: https://github.com/rust-lang/rust/pull/93658
373 [93742]: https://github.com/rust-lang/rust/pull/93742
374 [93824]: https://github.com/rust-lang/rust/pull/93824
375 [93918]: https://github.com/rust-lang/rust/pull/93918
376 [95026]: https://github.com/rust-lang/rust/pull/95026
378 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
379 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
380 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
381 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
382 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
384 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
385 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
386 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
387 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
388 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
389 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
390 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
391 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
392 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
393 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
394 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
395 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
396 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
397 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
398 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
399 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
400 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
401 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
402 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
403 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
404 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
405 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
406 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
407 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
408 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
410 Version 1.59.0 (2022-02-24)
411 ==========================
416 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
417 - [Stabilize destructuring assignment][90521]
418 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
419 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
424 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
425 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
426 - [Fix sparc64 ABI for aggregates with floating point members][91003]
427 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
428 - [Add support for riscv64gc-unknown-freebsd][91284]
429 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
430 - [Soft disable incremental compilation][94124]
432 This release disables incremental compilation, unless the user has explicitly
433 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
434 This is due to a known and relatively frequently occurring bug in incremental
435 compilation, which causes builds to issue internal compiler errors. This
436 particular bug is already fixed on nightly, but that fix has not yet rolled out
437 to stable and is deemed too risky for a direct stable backport.
439 As always, we encourage users to test with nightly and report bugs so that we
440 can track failures and fix issues earlier.
442 See [94124] for more details.
444 [94124]: https://github.com/rust-lang/rust/issues/94124
449 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
454 - [`std::thread::available_parallelism`][available_parallelism]
455 - [`Result::copied`][result-copied]
456 - [`Result::cloned`][result-cloned]
457 - [`arch::asm!`][asm]
458 - [`arch::global_asm!`][global_asm]
459 - [`ops::ControlFlow::is_break`][is_break]
460 - [`ops::ControlFlow::is_continue`][is_continue]
461 - [`TryFrom<char> for u8`][try_from_char_u8]
462 - [`char::TryFromCharError`][try_from_char_err]
463 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
465 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
466 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
467 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
468 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
469 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
470 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
471 - [`DoubleEndedIterator for ToLowercase`][lowercase]
472 - [`DoubleEndedIterator for ToUppercase`][uppercase]
473 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
474 - [`UnwindSafe for Once`][unwindsafe_once]
475 - [`RefUnwindSafe for Once`][refunwindsafe_once]
476 - [armv8 neon intrinsics for aarch64][stdarch/1266]
480 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
481 - [`mem::MaybeUninit::assume_init`][muninit_init]
482 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
483 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
488 - [Stabilize the `strip` profile option][cargo/10088]
489 - [Stabilize future-incompat-report][cargo/10165]
490 - [Support abbreviating `--release` as `-r`][cargo/10133]
491 - [Support `term.quiet` configuration][cargo/10152]
492 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
497 - [Refactor weak symbols in std::sys::unix][90846]
498 This may add new, versioned, symbols when building with a newer glibc, as the
499 standard library uses weak linkage rather than dynamically attempting to load
500 certain symbols at runtime.
501 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
502 This adds a future compatibility lint to supporting the use of cfg_attr
503 wrapping either crate_type or crate_name specification within Rust files;
504 it is recommended that users migrate to setting the equivalent command line
506 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
507 This may expose new names, leading to conflicts with preexisting names in a
508 given namespace and a compilation failure.
509 - [Cargo will document libraries before binaries.][cargo/10172]
510 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
511 - [Weaken guarantee around advancing underlying iterators in zip][83791]
512 - [Make split_inclusive() on an empty slice yield an empty output][89825]
513 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
514 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
519 These changes provide no direct user facing benefits, but represent significant
520 improvements to the internals and overall performance of rustc
523 - [Fix many cases of normalization-related ICEs][91255]
524 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
525 - [Store liveness in interval sets for region inference][90637]
527 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
528 unstable feature.][91867]
530 [91867]: https://github.com/rust-lang/rust/issues/91867
531 [83744]: https://github.com/rust-lang/rust/pull/83744/
532 [83791]: https://github.com/rust-lang/rust/pull/83791/
533 [85013]: https://github.com/rust-lang/rust/pull/85013/
534 [89825]: https://github.com/rust-lang/rust/pull/89825/
535 [89999]: https://github.com/rust-lang/rust/pull/89999/
536 [90128]: https://github.com/rust-lang/rust/pull/90128/
537 [90207]: https://github.com/rust-lang/rust/pull/90207/
538 [90521]: https://github.com/rust-lang/rust/pull/90521/
539 [90586]: https://github.com/rust-lang/rust/pull/90586/
540 [90637]: https://github.com/rust-lang/rust/pull/90637/
541 [90833]: https://github.com/rust-lang/rust/pull/90833/
542 [90846]: https://github.com/rust-lang/rust/pull/90846/
543 [91003]: https://github.com/rust-lang/rust/pull/91003/
544 [91172]: https://github.com/rust-lang/rust/pull/91172/
545 [91255]: https://github.com/rust-lang/rust/pull/91255/
546 [91284]: https://github.com/rust-lang/rust/pull/91284/
547 [91535]: https://github.com/rust-lang/rust/pull/91535/
548 [91593]: https://github.com/rust-lang/rust/pull/91593/
549 [91728]: https://github.com/rust-lang/rust/pull/91728/
550 [91878]: https://github.com/rust-lang/rust/pull/91878/
551 [91896]: https://github.com/rust-lang/rust/pull/91896/
552 [91926]: https://github.com/rust-lang/rust/pull/91926/
553 [91984]: https://github.com/rust-lang/rust/pull/91984/
554 [92020]: https://github.com/rust-lang/rust/pull/92020/
555 [92034]: https://github.com/rust-lang/rust/pull/92034/
556 [92137]: https://github.com/rust-lang/rust/pull/92137/
557 [92483]: https://github.com/rust-lang/rust/pull/92483/
558 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
559 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
560 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
561 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
562 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
563 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
564 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
565 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
567 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
568 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
569 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
570 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
571 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
572 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
573 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
574 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
575 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
576 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
577 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
578 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
579 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
580 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
581 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
582 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
583 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
584 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
585 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
586 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
587 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
588 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
589 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
590 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
591 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
592 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
594 Version 1.58.1 (2022-01-19)
595 ===========================
597 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
598 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
599 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
600 * [Fix wrong error message displayed when some imports are missing][91254]
601 * [Fix rustfmt not formatting generated files from stdin][92912]
603 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
604 [91254]: https://github.com/rust-lang/rust/pull/91254
605 [92912]: https://github.com/rust-lang/rust/pull/92912
606 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
607 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
609 Version 1.58.0 (2022-01-13)
610 ==========================
615 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
616 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
617 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
622 - [Add LLVM CFI support to the Rust compiler][89652]
623 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
624 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
625 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
626 - [Update the minimum external LLVM to 12][90175]
627 - [Add `x86_64-unknown-none` at Tier 3*][89062]
628 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
629 - [Don't abort compilation after giving a lint error][87337]
630 - [Error messages point at the source of trait bound obligations in more places][89580]
632 \* Refer to Rust's [platform support page][platform-support-doc] for more
633 information on Rust's tiered platform support.
638 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
639 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
640 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
641 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
642 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
643 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
648 - [`Metadata::is_symlink`]
649 - [`Path::is_symlink`]
650 - [`{integer}::saturating_div`]
651 - [`Option::unwrap_unchecked`]
652 - [`Result::unwrap_unchecked`]
653 - [`Result::unwrap_err_unchecked`]
656 These APIs are now usable in const contexts:
659 - [`Duration::checked_add`]
660 - [`Duration::saturating_add`]
661 - [`Duration::checked_sub`]
662 - [`Duration::saturating_sub`]
663 - [`Duration::checked_mul`]
664 - [`Duration::saturating_mul`]
665 - [`Duration::checked_div`]
670 - [Add --message-format for install command][cargo/10107]
671 - [Warn when alias shadows external subcommand][cargo/10082]
676 - [Show all Deref implementations recursively in rustdoc][90183]
677 - [Use computed visibility in rustdoc][88447]
682 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
683 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
684 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
685 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
686 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
687 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
692 These changes provide no direct user facing benefits, but represent significant
693 improvements to the internals and overall performance of rustc
696 - [Implement coherence checks for negative trait impls][90104]
697 - [Add rustc lint, warning when iterating over hashmaps][89558]
698 - [Optimize live point computation][90491]
699 - [Enable verification for 1/32nd of queries loaded from disk][90361]
700 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
702 [87337]: https://github.com/rust-lang/rust/pull/87337/
703 [87467]: https://github.com/rust-lang/rust/pull/87467/
704 [87704]: https://github.com/rust-lang/rust/pull/87704/
705 [88041]: https://github.com/rust-lang/rust/pull/88041/
706 [88447]: https://github.com/rust-lang/rust/pull/88447/
707 [88601]: https://github.com/rust-lang/rust/pull/88601/
708 [89062]: https://github.com/rust-lang/rust/pull/89062/
709 [89174]: https://github.com/rust-lang/rust/pull/89174/
710 [89551]: https://github.com/rust-lang/rust/pull/89551/
711 [89558]: https://github.com/rust-lang/rust/pull/89558/
712 [89580]: https://github.com/rust-lang/rust/pull/89580/
713 [89652]: https://github.com/rust-lang/rust/pull/89652/
714 [90041]: https://github.com/rust-lang/rust/pull/90041/
715 [90058]: https://github.com/rust-lang/rust/pull/90058/
716 [90104]: https://github.com/rust-lang/rust/pull/90104/
717 [90117]: https://github.com/rust-lang/rust/pull/90117/
718 [90175]: https://github.com/rust-lang/rust/pull/90175/
719 [90183]: https://github.com/rust-lang/rust/pull/90183/
720 [90297]: https://github.com/rust-lang/rust/pull/90297/
721 [90329]: https://github.com/rust-lang/rust/pull/90329/
722 [90361]: https://github.com/rust-lang/rust/pull/90361/
723 [90417]: https://github.com/rust-lang/rust/pull/90417/
724 [90473]: https://github.com/rust-lang/rust/pull/90473/
725 [90491]: https://github.com/rust-lang/rust/pull/90491/
726 [90733]: https://github.com/rust-lang/rust/pull/90733/
727 [90833]: https://github.com/rust-lang/rust/pull/90833/
728 [90846]: https://github.com/rust-lang/rust/pull/90846/
729 [91026]: https://github.com/rust-lang/rust/pull/91026/
730 [91207]: https://github.com/rust-lang/rust/pull/91207/
731 [91255]: https://github.com/rust-lang/rust/pull/91255/
732 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
733 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
734 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
735 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
736 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
737 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
738 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
739 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
740 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
741 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
743 Version 1.57.0 (2021-12-02)
744 ==========================
749 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
750 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
751 - [Allow panicking in constant evaluation.][89508]
752 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
757 - [Create more accurate debuginfo for vtables.][89597]
758 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
759 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
760 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
761 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
763 \* Refer to Rust's [platform support page][platform-support-doc] for more
764 information on Rust's tiered platform support.
769 - [Avoid allocations and copying in `Vec::leak`][89337]
770 - [Add `#[repr(i8)]` to `Ordering`][89507]
771 - [Optimize `File::read_to_end` and `read_to_string`][89582]
772 - [Update to Unicode 14.0][89614]
773 - [Many more functions are marked `#[must_use]`][89692], producing a warning
774 when ignoring their return value. This helps catch mistakes such as expecting
775 a function to mutate a value in place rather than return a new value.
780 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
781 - [`[T; N]::as_slice`][`array::as_slice`]
782 - [`collections::TryReserveError`]
783 - [`HashMap::try_reserve`]
784 - [`HashSet::try_reserve`]
785 - [`String::try_reserve`]
786 - [`String::try_reserve_exact`]
787 - [`Vec::try_reserve`]
788 - [`Vec::try_reserve_exact`]
789 - [`VecDeque::try_reserve`]
790 - [`VecDeque::try_reserve_exact`]
791 - [`Iterator::map_while`]
793 - [`proc_macro::is_available`]
794 - [`Command::get_program`]
795 - [`Command::get_args`]
796 - [`Command::get_envs`]
797 - [`Command::get_current_dir`]
801 These APIs are now usable in const contexts:
803 - [`hint::unreachable_unchecked`]
808 - [Stabilize custom profiles][cargo/9943]
813 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
814 This will break some builds that set `#![deny(dead_code)]`.
818 These changes provide no direct user facing benefits, but represent significant
819 improvements to the internals and overall performance of rustc
822 - [Added an experimental backend for codegen with `libgccjit`.][87260]
824 [85200]: https://github.com/rust-lang/rust/pull/85200/
825 [86191]: https://github.com/rust-lang/rust/pull/86191/
826 [87220]: https://github.com/rust-lang/rust/pull/87220/
827 [87260]: https://github.com/rust-lang/rust/pull/87260/
828 [88321]: https://github.com/rust-lang/rust/pull/88321/
829 [88529]: https://github.com/rust-lang/rust/pull/88529/
830 [88690]: https://github.com/rust-lang/rust/pull/88690/
831 [88952]: https://github.com/rust-lang/rust/pull/88952/
832 [89337]: https://github.com/rust-lang/rust/pull/89337/
833 [89507]: https://github.com/rust-lang/rust/pull/89507/
834 [89508]: https://github.com/rust-lang/rust/pull/89508/
835 [89582]: https://github.com/rust-lang/rust/pull/89582/
836 [89597]: https://github.com/rust-lang/rust/pull/89597/
837 [89614]: https://github.com/rust-lang/rust/pull/89614/
838 [89692]: https://github.com/rust-lang/rust/issues/89692/
839 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
840 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
841 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
842 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
843 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
844 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
845 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
846 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
847 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
848 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
849 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
850 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
851 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
852 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
853 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
854 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
855 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
856 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
857 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
858 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
859 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
861 Version 1.56.1 (2021-11-01)
862 ===========================
864 - New lints to detect the presence of bidirectional-override Unicode
865 codepoints in the compiled source code ([CVE-2021-42574])
867 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
869 Version 1.56.0 (2021-10-21)
870 ========================
875 - [The 2021 Edition is now stable.][rust#88100]
876 See [the edition guide][rust-2021-edition-guide] for more details.
877 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
878 - [Union field access is permitted in `const fn`.][rust#85769]
880 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
885 - [Upgrade to LLVM 13.][rust#87570]
886 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
887 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
888 - [Warnings can be forced on with `--force-warn`.][rust#87472]
889 This feature is primarily intended for usage by `cargo fix`, rather than end users.
890 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
891 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
892 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
894 \* Refer to Rust's [platform support page][platform-support-doc] for more
895 information on Rust's tiered platform support.
900 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
901 The Windows console still requires valid Unicode, but this change allows
902 splitting a UTF-8 character across multiple write calls. This allows, for
903 instance, programs that just read and write data buffers (e.g. copying a file
904 to stdout) without regard for Unicode or character boundaries.
905 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
906 For this use case, atomics scale much better under contention.
907 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
908 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
909 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
910 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
911 - [Treat invalid environment variable names as non-existent.][rust#86183]
912 Previously, the environment functions would panic if given a variable name
913 with an internal null character or equal sign (`=`). Now, these functions will
914 just treat such names as non-existent variables, since the OS cannot represent
915 the existence of a variable with such a name.
920 - [`std::os::unix::fs::chroot`]
921 - [`UnsafeCell::raw_get`]
922 - [`BufWriter::into_parts`]
923 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
924 These APIs were previously stable in `std`, but are now also available in `core`.
926 - [`String::shrink_to`]
927 - [`OsString::shrink_to`]
928 - [`PathBuf::shrink_to`]
929 - [`BinaryHeap::shrink_to`]
930 - [`VecDeque::shrink_to`]
931 - [`HashMap::shrink_to`]
932 - [`HashSet::shrink_to`]
934 These APIs are now usable in const contexts:
936 - [`std::mem::transmute`]
937 - [`[T]::first`][`slice::first`]
938 - [`[T]::split_first`][`slice::split_first`]
939 - [`[T]::last`][`slice::last`]
940 - [`[T]::split_last`][`slice::split_last`]
945 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
946 This has no effect at present on dependency version selection.
947 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
948 that support Rust code to include a crate's specified minimum version in the test matrix for that
954 - [Update to new argument parsing rules on Windows.][rust#87580]
955 This adjusts Rust's standard library to match the behavior of the standard
956 libraries for C/C++. The rules have changed slightly over time, and this PR
957 brings us to the latest set of rules (changed in 2008).
958 - [Disallow the aapcs calling convention on aarch64][rust#88399]
959 This was already not supported by LLVM; this change surfaces this lack of
960 support with a better error message.
961 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
962 - [Warn when an escaped newline skips multiple lines.][rust#87671]
963 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
964 may return different values on glibc <= 2.24.][rust#81825]
965 Rust now invokes the `clone3` system call directly, when available, to use new functionality
966 available via that system call. Older versions of glibc cache the result of `getpid`, and only
967 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
968 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
972 These changes provide no direct user facing benefits, but represent significant
973 improvements to the internals and overall performance of rustc
976 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
977 This improves the performance of most Rust builds.
978 - [Unify representation of macros in internal data structures.][rust#88019]
979 This change fixes a host of bugs with the handling of macros by the compiler,
982 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
983 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
984 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
985 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
986 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
987 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
988 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
989 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
990 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
991 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
992 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
993 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
994 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
995 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
996 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
997 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
998 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
999 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1000 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1001 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1002 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1003 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1004 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1005 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1006 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1007 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1008 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1009 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1010 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1011 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1012 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1013 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1014 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1015 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1016 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1017 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1018 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1019 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1020 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1021 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1022 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1023 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1025 Version 1.55.0 (2021-09-09)
1026 ============================
1030 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1031 will end at the maximum value of the integer.][83918]
1032 - [You can now explicitly import the prelude of different editions
1033 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1037 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1039 \* Refer to Rust's [platform support page][platform-support-doc] for more
1040 information on Rust's tiered platform support.
1045 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1046 These improvements should in general provide faster string parsing of floats,
1047 no longer reject certain valid floating point values, and reduce
1048 the produced code size for non-stripped artifacts.
1049 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1056 - [`IntoInnerError::into_error`]
1057 - [`IntoInnerError::into_parts`]
1058 - [`MaybeUninit::assume_init_mut`]
1059 - [`MaybeUninit::assume_init_ref`]
1060 - [`MaybeUninit::write`]
1062 - [`ops::ControlFlow`]
1064 - [`x86::_bittestandcomplement`]
1065 - [`x86::_bittestandreset`]
1066 - [`x86::_bittestandset`]
1067 - [`x86_64::_bittest64`]
1068 - [`x86_64::_bittestandcomplement64`]
1069 - [`x86_64::_bittestandreset64`]
1070 - [`x86_64::_bittestandset64`]
1072 The following previously stable functions are now `const`.
1074 - [`str::from_utf8_unchecked`]
1079 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1080 rustc in parallel such as when using `cargo test`.][cargo/9675]
1081 - [The package definition in `cargo metadata` now includes the `"default_run"`
1082 field from the manifest.][cargo/9550]
1083 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1084 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1085 of packages.][cargo/9663]
1089 - [Added "Go to item on exact match" search option.][85876]
1090 - [The "Implementors" section on traits no longer shows redundant
1091 method definitions.][85970]
1092 - [Trait implementations are toggled open by default.][86260] This should make the
1093 implementations more searchable by tools like `CTRL+F` in your browser.
1094 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1095 through type aliases.][86334]
1096 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1097 "Trait Implementations" section.][86513]
1102 - [std functions that return an `io::Error` will no longer use the
1103 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1104 kinds of errors could be categorised [into newer more specific `ErrorKind`
1105 variants][79965], and that they do not represent a user error.
1106 - [Using environment variable names with `process::Command` on Windows now
1107 behaves as expected.][85270] Previously using envionment variables with
1108 `Command` would cause them to be ASCII-uppercased.
1109 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1110 with `rustdoc::`][86849]
1111 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1112 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1113 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1116 [86849]: https://github.com/rust-lang/rust/pull/86849
1117 [86513]: https://github.com/rust-lang/rust/pull/86513
1118 [86334]: https://github.com/rust-lang/rust/pull/86334
1119 [86260]: https://github.com/rust-lang/rust/pull/86260
1120 [85970]: https://github.com/rust-lang/rust/pull/85970
1121 [85876]: https://github.com/rust-lang/rust/pull/85876
1122 [83572]: https://github.com/rust-lang/rust/pull/83572
1123 [86294]: https://github.com/rust-lang/rust/pull/86294
1124 [86858]: https://github.com/rust-lang/rust/pull/86858
1125 [86761]: https://github.com/rust-lang/rust/pull/86761
1126 [85746]: https://github.com/rust-lang/rust/pull/85746
1127 [85270]: https://github.com/rust-lang/rust/pull/85270
1128 [83918]: https://github.com/rust-lang/rust/pull/83918
1129 [79965]: https://github.com/rust-lang/rust/pull/79965
1130 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1131 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1132 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1133 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1134 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1135 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1136 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1137 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1138 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1139 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1140 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1141 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1142 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1143 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1144 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1145 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1146 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1147 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1148 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1149 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1150 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1151 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1154 Version 1.54.0 (2021-07-29)
1155 ============================
1158 -----------------------
1160 - [You can now use macros for values in some built-in attributes.][83366]
1161 This primarily allows you to call macros within the `#[doc]` attribute. For
1162 example, to include external documentation in your crate, you can now write
1165 #![doc = include_str!("README.md")]
1168 - [You can now cast between unsized slice types (and types which contain
1169 unsized slices) in `const fn`.][85078]
1170 - [You can now use multiple generic lifetimes with `impl Trait` where the
1171 lifetimes don't explicitly outlive another.][84701] In code this means
1172 that you can now have `impl Trait<'a, 'b>` where as before you could
1173 only have `impl Trait<'a, 'b> where 'b: 'a`.
1176 -----------------------
1178 - [Rustc will now search for custom JSON targets in
1179 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1180 directory.][83800] You can find your sysroot directory by running
1181 `rustc --print sysroot`.
1182 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1183 - [You can now use `#[target_feature]` on safe functions when targeting
1184 WebAssembly platforms.][84988]
1185 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1186 - [Added tier 3\* support for `bpfel-unknown-none`
1187 and `bpfeb-unknown-none`.][79608]
1188 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1190 \* Refer to Rust's [platform support page][platform-support-doc] for more
1191 information on Rust's tiered platform support.
1194 -----------------------
1196 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1197 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1198 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1199 - [The implementations of vendor intrinsics in core::arch have been
1200 significantly refactored.][83278] The main user-visible changes are
1201 a 50% reduction in the size of libcore.rlib and stricter validation
1202 of constant operands passed to intrinsics. The latter is technically
1203 a breaking change, but allows Rust to more closely match the C vendor
1209 - [`BTreeMap::into_keys`]
1210 - [`BTreeMap::into_values`]
1211 - [`HashMap::into_keys`]
1212 - [`HashMap::into_values`]
1214 - [`VecDeque::binary_search`]
1215 - [`VecDeque::binary_search_by`]
1216 - [`VecDeque::binary_search_by_key`]
1217 - [`VecDeque::partition_point`]
1222 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1223 the dependency graph.][cargo/9520]
1224 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1225 in the tree ][cargo/9499]
1226 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1227 macro dependencies.][cargo/9488]
1228 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1229 This variable points to a directory that integration tests and benches
1230 can use as a "scratchpad" for testing filesystem operations.
1234 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1235 - [Previously unsound code is no longer permitted where different constructors in branches
1236 could require different lifetimes.][85574]
1237 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
1238 than before and may reject some previously accepted code.
1239 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1240 when compiled with `codegen-units = 1`.][86063]
1242 [85574]: https://github.com/rust-lang/rust/issues/85574
1243 [86831]: https://github.com/rust-lang/rust/issues/86831
1244 [86063]: https://github.com/rust-lang/rust/issues/86063
1245 [79608]: https://github.com/rust-lang/rust/pull/79608
1246 [84988]: https://github.com/rust-lang/rust/pull/84988
1247 [84701]: https://github.com/rust-lang/rust/pull/84701
1248 [84072]: https://github.com/rust-lang/rust/pull/84072
1249 [85745]: https://github.com/rust-lang/rust/pull/85745
1250 [84744]: https://github.com/rust-lang/rust/pull/84744
1251 [85078]: https://github.com/rust-lang/rust/pull/85078
1252 [84717]: https://github.com/rust-lang/rust/pull/84717
1253 [83800]: https://github.com/rust-lang/rust/pull/83800
1254 [83366]: https://github.com/rust-lang/rust/pull/83366
1255 [83278]: https://github.com/rust-lang/rust/pull/83278
1256 [85292]: https://github.com/rust-lang/rust/pull/85292
1257 [82834]: https://github.com/rust-lang/rust/pull/82834
1258 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1259 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1260 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1261 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1262 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1263 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1264 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1265 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1266 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1267 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1268 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1270 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1272 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1274 Version 1.53.0 (2021-06-17)
1275 ============================
1278 -----------------------
1279 - [You can now use unicode for identifiers.][83799] This allows multilingual
1280 identifiers but still doesn't allow glyphs that are not considered characters
1281 such as `◆` or `🦀`. More specifically you can now use any identifier that
1282 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1283 is the same standard as languages like Python, however Rust uses NFC
1284 normalization which may be different from other languages.
1285 - [You can now specify "or patterns" inside pattern matches.][79278]
1286 Previously you could only use `|` (OR) on complete patterns. E.g.
1290 matches!(x, Some(1) | Some(2));
1292 matches!(x, Some(1 | 2));
1294 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1295 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1296 to change semantics to being a pattern fragment in a future edition.
1299 -----------------------
1300 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1301 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1302 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1304 \* Refer to Rust's [platform support page][platform-support-doc] for more
1305 information on Rust's tiered platform support.
1308 -----------------------
1309 - [Abort messages will now forward to `android_set_abort_message` on
1310 Android platforms when available.][81469]
1311 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1312 - [Arrays of any length now implement `IntoIterator`.][84147]
1313 Currently calling `.into_iter()` as a method on an array will
1314 return `impl Iterator<Item=&T>`, but this may change in a
1315 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1316 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1317 - [`leading_zeros`, and `trailing_zeros` are now available on all
1318 `NonZero` integer types.][84082]
1319 - [`{f32, f64}::from_str` now parse and print special values
1320 (`NaN`, `-0`) according to IEEE 754.][78618]
1321 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1322 - [Add the `BITS` associated constant to all numeric types.][82565]
1326 - [`AtomicBool::fetch_update`]
1327 - [`AtomicPtr::fetch_update`]
1328 - [`BTreeMap::retain`]
1329 - [`BTreeSet::retain`]
1330 - [`BufReader::seek_relative`]
1331 - [`DebugStruct::non_exhaustive`]
1333 - [`Duration::ZERO`]
1334 - [`Duration::is_zero`]
1335 - [`Duration::saturating_add`]
1336 - [`Duration::saturating_mul`]
1337 - [`Duration::saturating_sub`]
1338 - [`ErrorKind::Unsupported`]
1339 - [`Option::insert`]
1340 - [`Ordering::is_eq`]
1341 - [`Ordering::is_ge`]
1342 - [`Ordering::is_gt`]
1343 - [`Ordering::is_le`]
1344 - [`Ordering::is_lt`]
1345 - [`Ordering::is_ne`]
1346 - [`OsStr::is_ascii`]
1347 - [`OsStr::make_ascii_lowercase`]
1348 - [`OsStr::make_ascii_uppercase`]
1349 - [`OsStr::to_ascii_lowercase`]
1350 - [`OsStr::to_ascii_uppercase`]
1351 - [`Peekable::peek_mut`]
1352 - [`Rc::decrement_strong_count`]
1353 - [`Rc::increment_strong_count`]
1354 - [`Vec::extend_from_within`]
1355 - [`array::from_mut`]
1356 - [`array::from_ref`]
1357 - [`cmp::max_by_key`]
1359 - [`cmp::min_by_key`]
1361 - [`f32::is_subnormal`]
1362 - [`f64::is_subnormal`]
1365 -----------------------
1366 - [Cargo now supports git repositories where the default `HEAD` branch is not
1367 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1368 which can handle default branches correctly.
1369 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1370 - [The `authors` field is no longer included in `Cargo.toml` for new
1371 projects.][cargo/9282]
1374 -----------------------
1375 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1376 without hyperlinks.][81764]
1380 - [Implement token-based handling of attributes during expansion][82608]
1381 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1382 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1383 to confusion and potential security vulnerabilities and [is no
1384 longer recommended][ietf6943].
1385 - [The added `BITS` constant may conflict with external definitions.][85667]
1386 In particular, this was known to be a problem in the `lexical-core` crate,
1387 but they have published fixes for semantic versions 0.4 through 0.7. To
1388 update this dependency alone, use `cargo update -p lexical-core`.
1389 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1393 These changes provide no direct user facing benefits, but represent significant
1394 improvements to the internals and overall performance of rustc and
1397 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1398 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1399 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1400 - [Rework rustdoc const type][82873]
1402 [85667]: https://github.com/rust-lang/rust/pull/85667
1403 [83386]: https://github.com/rust-lang/rust/pull/83386
1404 [82771]: https://github.com/rust-lang/rust/pull/82771
1405 [84147]: https://github.com/rust-lang/rust/pull/84147
1406 [84082]: https://github.com/rust-lang/rust/pull/84082
1407 [83799]: https://github.com/rust-lang/rust/pull/83799
1408 [83681]: https://github.com/rust-lang/rust/pull/83681
1409 [83652]: https://github.com/rust-lang/rust/pull/83652
1410 [83387]: https://github.com/rust-lang/rust/pull/83387
1411 [82873]: https://github.com/rust-lang/rust/pull/82873
1412 [82864]: https://github.com/rust-lang/rust/pull/82864
1413 [82608]: https://github.com/rust-lang/rust/pull/82608
1414 [82565]: https://github.com/rust-lang/rust/pull/82565
1415 [80525]: https://github.com/rust-lang/rust/pull/80525
1416 [79278]: https://github.com/rust-lang/rust/pull/79278
1417 [78618]: https://github.com/rust-lang/rust/pull/78618
1418 [77704]: https://github.com/rust-lang/rust/pull/77704
1419 [83941]: https://github.com/rust-lang/rust/pull/83941
1420 [83065]: https://github.com/rust-lang/rust/pull/83065
1421 [81764]: https://github.com/rust-lang/rust/pull/81764
1422 [81469]: https://github.com/rust-lang/rust/pull/81469
1423 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1424 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1425 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1426 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1427 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1428 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1429 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1430 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1431 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1432 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1433 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1434 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1435 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1436 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1437 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1438 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1439 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1440 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1441 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1442 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1443 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1444 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1445 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1446 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1447 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1448 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1449 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1450 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1451 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1452 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1453 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1454 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1455 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1456 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1457 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1458 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1459 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1460 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1461 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1462 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1463 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1466 Version 1.52.1 (2021-05-10)
1467 ============================
1469 This release disables incremental compilation, unless the user has explicitly
1470 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1472 This is due to the widespread, and frequently occurring, breakage encountered by
1473 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1474 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1475 newly added incremental verification are still present in past stable versions,
1476 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1479 These problems only affect incremental builds, so release builds with Cargo
1480 should not be affected unless the user has explicitly opted into incremental.
1481 Debug and check builds are affected.
1483 See [84970] for more details.
1485 [84970]: https://github.com/rust-lang/rust/issues/84970
1487 Version 1.52.0 (2021-05-06)
1488 ============================
1492 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1493 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1494 is allowed by default, and may become a warning or hard error in a
1496 - [You can now cast mutable references to arrays to a pointer of the same type as
1497 the element.][81479]
1501 - [Upgraded the default LLVM to LLVM 12.][81451]
1503 Added tier 3\* support for the following targets.
1505 - [`s390x-unknown-linux-musl`][82166]
1506 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1507 - [`powerpc-unknown-openbsd`][82733]
1509 \* Refer to Rust's [platform support page][platform-support-doc] for more
1510 information on Rust's tiered platform support.
1514 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1515 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1516 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1517 - [All integer division and remainder operations are now `const`.][80962]
1521 - [`Arguments::as_str`]
1523 - [`char::REPLACEMENT_CHARACTER`]
1524 - [`char::UNICODE_VERSION`]
1525 - [`char::decode_utf16`]
1526 - [`char::from_digit`]
1527 - [`char::from_u32_unchecked`]
1528 - [`char::from_u32`]
1529 - [`slice::partition_point`]
1530 - [`str::rsplit_once`]
1531 - [`str::split_once`]
1533 The following previously stable APIs are now `const`.
1535 - [`char::len_utf8`]
1536 - [`char::len_utf16`]
1537 - [`char::to_ascii_uppercase`]
1538 - [`char::to_ascii_lowercase`]
1539 - [`char::eq_ignore_ascii_case`]
1540 - [`u8::to_ascii_uppercase`]
1541 - [`u8::to_ascii_lowercase`]
1542 - [`u8::eq_ignore_ascii_case`]
1546 - [Rustdoc lints are now treated as a tool lint, meaning that
1547 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1548 Using the old style is still allowed, and will become a warning in
1550 - [Rustdoc now supports argument files.][82261]
1551 - [Rustdoc now generates smart punctuation for documentation.][79423]
1552 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1560 - [You can now pass multiple filters to tests.][81356] E.g.
1561 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1562 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1563 allowing you to see `std` symbols when debugging.][82218]
1567 These changes provide no direct user facing benefits, but represent significant
1568 improvements to the internals and overall performance of rustc and
1571 - [Check the result cache before the DepGraph when ensuring queries][81855]
1572 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1573 - [Only store a LocalDefId in some HIR nodes][81611]
1574 - [Store HIR attributes in a side table][79519]
1578 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1579 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1580 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1581 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1582 languages in code blocks.][78429]
1583 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1584 - [Changes in how proc macros handle whitespace may lead to panics when used
1585 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1586 - [Turn `#[derive]` into a regular macro attribute][79078]
1588 [84136]: https://github.com/rust-lang/rust/issues/84136
1589 [80763]: https://github.com/rust-lang/rust/pull/80763
1590 [82166]: https://github.com/rust-lang/rust/pull/82166
1591 [82121]: https://github.com/rust-lang/rust/pull/82121
1592 [81879]: https://github.com/rust-lang/rust/pull/81879
1593 [82261]: https://github.com/rust-lang/rust/pull/82261
1594 [82218]: https://github.com/rust-lang/rust/pull/82218
1595 [82216]: https://github.com/rust-lang/rust/pull/82216
1596 [82202]: https://github.com/rust-lang/rust/pull/82202
1597 [81855]: https://github.com/rust-lang/rust/pull/81855
1598 [81766]: https://github.com/rust-lang/rust/pull/81766
1599 [81744]: https://github.com/rust-lang/rust/pull/81744
1600 [81611]: https://github.com/rust-lang/rust/pull/81611
1601 [81479]: https://github.com/rust-lang/rust/pull/81479
1602 [81451]: https://github.com/rust-lang/rust/pull/81451
1603 [81356]: https://github.com/rust-lang/rust/pull/81356
1604 [80962]: https://github.com/rust-lang/rust/pull/80962
1605 [80553]: https://github.com/rust-lang/rust/pull/80553
1606 [80527]: https://github.com/rust-lang/rust/pull/80527
1607 [79519]: https://github.com/rust-lang/rust/pull/79519
1608 [79423]: https://github.com/rust-lang/rust/pull/79423
1609 [79208]: https://github.com/rust-lang/rust/pull/79208
1610 [78429]: https://github.com/rust-lang/rust/pull/78429
1611 [82733]: https://github.com/rust-lang/rust/pull/82733
1612 [82594]: https://github.com/rust-lang/rust/pull/82594
1613 [79078]: https://github.com/rust-lang/rust/pull/79078
1614 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1615 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1616 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1617 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1618 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1619 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1620 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1621 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1622 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1623 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1624 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1625 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1626 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1627 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1628 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1629 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1630 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1631 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1632 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1633 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1634 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1635 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1637 Version 1.51.0 (2021-03-25)
1638 ============================
1642 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1643 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1644 E.g. you can now write the following. Note: Only values of primitive integers,
1645 `bool`, or `char` types are currently permitted.
1647 struct GenericArray<T, const LENGTH: usize> {
1651 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1652 const fn last(&self) -> Option<&T> {
1656 Some(&self.inner[LENGTH - 1])
1666 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1667 This option controls whether debug information is split across multiple files
1668 or packed into a single file. **Note** This option is unstable on other platforms.
1669 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1670 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1671 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1672 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1674 \* Refer to Rust's [platform support page][platform-support-doc] for more
1675 information on Rust's tiered platform support.
1680 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1681 - [`str` now implements `AsMut<str>`.][80279]
1682 - [`u64` and `u128` now implement `From<char>`.][79502]
1683 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1684 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1685 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1686 - [`io::Empty` now implements `io::Seek`.][78044]
1687 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1688 `T: ?Sized` types.][80764]
1689 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1695 - [`Arc::decrement_strong_count`]
1696 - [`Arc::increment_strong_count`]
1697 - [`Once::call_once_force`]
1698 - [`Peekable::next_if_eq`]
1699 - [`Peekable::next_if`]
1700 - [`Seek::stream_position`]
1701 - [`array::IntoIter`]
1702 - [`panic::panic_any`]
1704 - [`ptr::addr_of_mut!`]
1705 - [`slice::fill_with`]
1706 - [`slice::split_inclusive_mut`]
1707 - [`slice::split_inclusive`]
1708 - [`slice::strip_prefix`]
1709 - [`slice::strip_suffix`]
1710 - [`str::split_inclusive`]
1711 - [`sync::OnceState`]
1713 - [`VecDeque::range`]
1714 - [`VecDeque::range_mut`]
1718 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1719 codegen option.][cargo/9112]
1720 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1721 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1722 to avoid unifying features of dependencies where that unification could be unwanted.
1723 Such as using the same dependency with a `std` feature in a build scripts and
1724 proc-macros, while using the `no-std` feature in the final binary. See the
1725 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1730 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1731 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1732 documentation.][79642]
1734 Various improvements to intra-doc links:
1736 - [You can link to non-path primitives such as `slice`.][80181]
1737 - [You can link to associated items.][74489]
1738 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1742 - [You can now pass `--include-ignored` to tests (e.g. with
1743 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1748 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1749 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1751 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1752 for the distributed artifacts.][81521]
1753 - `armv5te-unknown-linux-gnueabi`
1754 - `sparc64-unknown-linux-gnu`
1755 - `thumbv7neon-unknown-linux-gnueabihf`
1756 - `armv7-unknown-linux-gnueabi`
1757 - `x86_64-unknown-linux-gnux32`
1758 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1763 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1765 [79135]: https://github.com/rust-lang/rust/pull/79135
1766 [74489]: https://github.com/rust-lang/rust/pull/74489
1767 [76934]: https://github.com/rust-lang/rust/pull/76934
1768 [79570]: https://github.com/rust-lang/rust/pull/79570
1769 [80181]: https://github.com/rust-lang/rust/pull/80181
1770 [79642]: https://github.com/rust-lang/rust/pull/79642
1771 [80945]: https://github.com/rust-lang/rust/pull/80945
1772 [80279]: https://github.com/rust-lang/rust/pull/80279
1773 [80053]: https://github.com/rust-lang/rust/pull/80053
1774 [79502]: https://github.com/rust-lang/rust/pull/79502
1775 [75180]: https://github.com/rust-lang/rust/pull/75180
1776 [81521]: https://github.com/rust-lang/rust/pull/81521
1777 [80968]: https://github.com/rust-lang/rust/pull/80968
1778 [80959]: https://github.com/rust-lang/rust/pull/80959
1779 [80718]: https://github.com/rust-lang/rust/pull/80718
1780 [80653]: https://github.com/rust-lang/rust/pull/80653
1781 [80579]: https://github.com/rust-lang/rust/pull/80579
1782 [79998]: https://github.com/rust-lang/rust/pull/79998
1783 [78044]: https://github.com/rust-lang/rust/pull/78044
1784 [81455]: https://github.com/rust-lang/rust/pull/81455
1785 [80764]: https://github.com/rust-lang/rust/pull/80764
1786 [80749]: https://github.com/rust-lang/rust/pull/80749
1787 [80662]: https://github.com/rust-lang/rust/pull/80662
1788 [79134]: https://github.com/rust-lang/rust/pull/79134
1789 [80966]: https://github.com/rust-lang/rust/pull/80966
1790 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1791 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1792 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1793 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1794 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1795 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1796 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1797 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1798 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1799 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1800 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1801 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1802 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1803 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1804 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1805 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1806 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1807 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1808 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1809 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1810 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1811 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1812 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1814 Version 1.50.0 (2021-02-11)
1815 ============================
1818 -----------------------
1819 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1820 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1821 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1824 -----------------------
1825 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1826 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1827 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1828 - [Dropped support for all cloudabi targets.][78439]
1830 \* Refer to Rust's [platform support page][platform-support-doc] for more
1831 information on Rust's tiered platform support.
1834 -----------------------
1836 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1837 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1838 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1839 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1840 up the same amount of space as `File`.
1846 - [`btree_map::Entry::or_insert_with_key`]
1849 - [`hash_map::Entry::or_insert_with_key`]
1853 - [`UnsafeCell::get_mut`]
1855 The following previously stable methods are now `const`.
1857 - [`IpAddr::is_ipv4`]
1858 - [`IpAddr::is_ipv6`]
1859 - [`IpAddr::is_unspecified`]
1860 - [`IpAddr::is_loopback`]
1861 - [`IpAddr::is_multicast`]
1862 - [`Ipv4Addr::octets`]
1863 - [`Ipv4Addr::is_loopback`]
1864 - [`Ipv4Addr::is_private`]
1865 - [`Ipv4Addr::is_link_local`]
1866 - [`Ipv4Addr::is_multicast`]
1867 - [`Ipv4Addr::is_broadcast`]
1868 - [`Ipv4Addr::is_documentation`]
1869 - [`Ipv4Addr::to_ipv6_compatible`]
1870 - [`Ipv4Addr::to_ipv6_mapped`]
1871 - [`Ipv6Addr::segments`]
1872 - [`Ipv6Addr::is_unspecified`]
1873 - [`Ipv6Addr::is_loopback`]
1874 - [`Ipv6Addr::is_multicast`]
1875 - [`Ipv6Addr::to_ipv4`]
1878 - [`Layout::from_size_align`]
1879 - `pow` for all integer types.
1880 - `checked_pow` for all integer types.
1881 - `saturating_pow` for all integer types.
1882 - `wrapping_pow` for all integer types.
1883 - `next_power_of_two` for all unsigned integer types.
1884 - `checked_next_power_of_two` for all unsigned integer types.
1887 -----------------------
1889 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1890 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1891 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1892 contents of that directory for changes.][cargo/8973]
1893 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1898 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1899 - [Running tests will now print the total time taken to execute.][75752]
1904 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1905 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1906 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1907 unhygenic `macro_rules!` macros.][79472]
1908 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1909 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1910 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1911 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1912 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1913 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1915 [74989]: https://github.com/rust-lang/rust/pull/74989
1916 [79261]: https://github.com/rust-lang/rust/pull/79261
1917 [79896]: https://github.com/rust-lang/rust/pull/79896
1918 [79484]: https://github.com/rust-lang/rust/pull/79484
1919 [79472]: https://github.com/rust-lang/rust/pull/79472
1920 [79270]: https://github.com/rust-lang/rust/pull/79270
1921 [79003]: https://github.com/rust-lang/rust/pull/79003
1922 [78864]: https://github.com/rust-lang/rust/pull/78864
1923 [78636]: https://github.com/rust-lang/rust/pull/78636
1924 [78439]: https://github.com/rust-lang/rust/pull/78439
1925 [78343]: https://github.com/rust-lang/rust/pull/78343
1926 [78296]: https://github.com/rust-lang/rust/pull/78296
1927 [78068]: https://github.com/rust-lang/rust/pull/78068
1928 [75752]: https://github.com/rust-lang/rust/pull/75752
1929 [74699]: https://github.com/rust-lang/rust/pull/74699
1930 [78142]: https://github.com/rust-lang/rust/pull/78142
1931 [77484]: https://github.com/rust-lang/rust/pull/77484
1932 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1933 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1934 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1935 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1936 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1937 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1938 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1939 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1940 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1941 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1942 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1943 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1944 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1945 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1946 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1947 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1948 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1949 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1950 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1951 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1952 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1953 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1954 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1955 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1956 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1957 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1958 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1959 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1960 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1961 [`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
1962 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1963 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1964 [`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
1965 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1968 Version 1.49.0 (2020-12-31)
1969 ============================
1972 -----------------------
1974 - [Unions can now implement `Drop`, and you can now have a field in a union
1975 with `ManuallyDrop<T>`.][77547]
1976 - [You can now cast uninhabited enums to integers.][76199]
1977 - [You can now bind by reference and by move in patterns.][76119] This
1978 allows you to selectively borrow individual components of a type. E.g.
1986 let person = Person {
1987 name: String::from("Alice"),
1991 // `name` is moved out of person, but `age` is referenced.
1992 let Person { name, ref age } = person;
1993 println!("{} {}", name, age);
1997 -----------------------
1999 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2000 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2001 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2002 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2003 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2004 - [Output from threads spawned in tests is now captured.][78227]
2005 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2007 \* Refer to Rust's [platform support page][platform-support-doc] for more
2008 information on Rust's tiered platform support.
2011 -----------------------
2013 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2014 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2019 - [`slice::select_nth_unstable`]
2020 - [`slice::select_nth_unstable_by`]
2021 - [`slice::select_nth_unstable_by_key`]
2023 The following previously stable methods are now `const`.
2025 - [`Poll::is_ready`]
2026 - [`Poll::is_pending`]
2029 -----------------------
2030 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2031 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2032 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2033 variable will be set if the crate being built is one the user selected to build, either
2034 with `-p` or through defaults.
2035 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2041 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2042 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2043 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2044 Previously such invalid or unused attributes could be ignored.
2045 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2046 read [this post about the changes][rustdoc-ws-post] for more details.
2047 - [Trait bounds are no longer inferred for associated types.][79904]
2051 These changes provide no direct user facing benefits, but represent significant
2052 improvements to the internals and overall performance of rustc and
2055 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2056 Local Storage model.][78201]
2057 - [Calculate visibilities once in resolve.][78077]
2058 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2059 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2062 [75991]: https://github.com/rust-lang/rust/pull/75991
2063 [78951]: https://github.com/rust-lang/rust/pull/78951
2064 [78848]: https://github.com/rust-lang/rust/pull/78848
2065 [78746]: https://github.com/rust-lang/rust/pull/78746
2066 [78376]: https://github.com/rust-lang/rust/pull/78376
2067 [78228]: https://github.com/rust-lang/rust/pull/78228
2068 [78227]: https://github.com/rust-lang/rust/pull/78227
2069 [78201]: https://github.com/rust-lang/rust/pull/78201
2070 [78109]: https://github.com/rust-lang/rust/pull/78109
2071 [78077]: https://github.com/rust-lang/rust/pull/78077
2072 [77997]: https://github.com/rust-lang/rust/pull/77997
2073 [77703]: https://github.com/rust-lang/rust/pull/77703
2074 [77547]: https://github.com/rust-lang/rust/pull/77547
2075 [77015]: https://github.com/rust-lang/rust/pull/77015
2076 [76199]: https://github.com/rust-lang/rust/pull/76199
2077 [76119]: https://github.com/rust-lang/rust/pull/76119
2078 [75914]: https://github.com/rust-lang/rust/pull/75914
2079 [79004]: https://github.com/rust-lang/rust/pull/79004
2080 [78676]: https://github.com/rust-lang/rust/pull/78676
2081 [79904]: https://github.com/rust-lang/rust/issues/79904
2082 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2083 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2084 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2085 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2086 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2087 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2088 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2089 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2090 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2091 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2093 Version 1.48.0 (2020-11-19)
2094 ==========================
2099 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2100 is still rejected *semantically*, but can now be parsed by procedural macros.
2104 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2105 `rustc` whether to link its own C runtime and libraries or to rely on a external
2106 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2107 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2108 Note: If you're using cargo you must explicitly pass the `--target` flag.
2109 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2111 \* Refer to Rust's [platform support page][platform-support-doc] for more
2112 information on Rust's tiered platform support.
2116 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2117 and `&Stderr`.][76275]
2118 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2119 - [The `matches!` macro now supports having a trailing comma.][74880]
2120 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2121 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2125 - [`slice::as_ptr_range`]
2126 - [`slice::as_mut_ptr_range`]
2127 - [`VecDeque::make_contiguous`]
2128 - [`future::pending`]
2131 The following previously stable methods are now `const fn`'s:
2133 - [`Option::is_some`]
2134 - [`Option::is_none`]
2135 - [`Option::as_ref`]
2137 - [`Result::is_err`]
2138 - [`Result::as_ref`]
2139 - [`Ordering::reverse`]
2140 - [`Ordering::then`]
2147 - [You can now link to items in `rustdoc` using the intra-doc link
2148 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2149 a link to `std::future`'s documentation. See ["Linking to items by
2150 name"][intradoc-links] for more information.
2151 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2152 when searching through `rustdoc`'s UI.][75740]
2156 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2157 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2158 promoted to `'static` lifetime any more inside `const fn`s.
2159 - [Associated type bindings on trait objects are now verified to meet the bounds
2160 declared on the trait when checking that they implement the trait.][27675]
2161 - [When trait bounds on associated types or opaque types are ambiguous, the
2162 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2163 - [Fixed recursive nonterminals not being expanded in macros during
2164 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2165 correctly handling recursive nonterminal tokens.
2166 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2167 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2168 in places where they have no effect.][73461]
2169 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2170 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2171 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2172 disallow zero-initialization.][71274]
2173 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2174 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2175 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2176 see the [`catch_unwind`] documentation for further information.
2182 These changes provide no direct user facing benefits, but represent significant
2183 improvements to the internals and overall performance of rustc and
2186 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2187 You can continue building with `make` by setting `ninja=false` in
2189 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2190 - [Made `ensure_sufficient_stack()` non-generic][76680]
2192 [78143]: https://github.com/rust-lang/rust/issues/78143
2193 [76680]: https://github.com/rust-lang/rust/pull/76680/
2194 [76030]: https://github.com/rust-lang/rust/pull/76030/
2195 [70212]: https://github.com/rust-lang/rust/pull/70212/
2196 [27675]: https://github.com/rust-lang/rust/issues/27675/
2197 [54121]: https://github.com/rust-lang/rust/issues/54121/
2198 [71274]: https://github.com/rust-lang/rust/pull/71274/
2199 [77386]: https://github.com/rust-lang/rust/pull/77386/
2200 [77153]: https://github.com/rust-lang/rust/pull/77153/
2201 [77055]: https://github.com/rust-lang/rust/pull/77055/
2202 [76275]: https://github.com/rust-lang/rust/pull/76275/
2203 [76310]: https://github.com/rust-lang/rust/pull/76310/
2204 [76420]: https://github.com/rust-lang/rust/pull/76420/
2205 [76158]: https://github.com/rust-lang/rust/pull/76158/
2206 [75857]: https://github.com/rust-lang/rust/pull/75857/
2207 [75585]: https://github.com/rust-lang/rust/pull/75585/
2208 [75740]: https://github.com/rust-lang/rust/pull/75740/
2209 [75502]: https://github.com/rust-lang/rust/pull/75502/
2210 [74880]: https://github.com/rust-lang/rust/pull/74880/
2211 [74922]: https://github.com/rust-lang/rust/pull/74922/
2212 [74430]: https://github.com/rust-lang/rust/pull/74430/
2213 [74194]: https://github.com/rust-lang/rust/pull/74194/
2214 [73461]: https://github.com/rust-lang/rust/pull/73461/
2215 [73166]: https://github.com/rust-lang/rust/pull/73166/
2216 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2217 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2218 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2219 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2220 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2221 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2222 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2223 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2224 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2225 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2226 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2227 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2228 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2229 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2230 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2233 Version 1.47.0 (2020-10-08)
2234 ==========================
2238 - [Closures will now warn when not used.][74869]
2242 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2243 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2245 - [Upgraded to LLVM 11.][73526]
2246 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2247 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2248 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2250 \* Refer to Rust's [platform support page][platform-support-doc] for more
2251 information on Rust's tiered platform support.
2255 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2256 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2257 those of length less than 33.][74060]
2258 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2259 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2260 `PartialEq`, and `PartialOrd`.][73583]
2264 - [`Ident::new_raw`]
2265 - [`Range::is_empty`]
2266 - [`RangeInclusive::is_empty`]
2267 - [`Result::as_deref`]
2268 - [`Result::as_deref_mut`]
2270 - [`pointer::offset_from`]
2274 The following previously stable APIs have now been made const.
2276 - [The `new` method for all `NonZero` integers.][73858]
2277 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2278 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2279 methods for all integers.][73858]
2280 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2281 signed integers.][73858]
2282 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2283 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2284 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2285 `is_ascii_control` methods for `char` and `u8`.][73858]
2289 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2290 You can override this by setting the following in your `Cargo.toml`.
2292 [profile.release.build-override]
2295 - [`cargo-help` will now display man pages for commands rather just the
2296 `--help` text.][cargo/8456]
2297 - [`cargo-metadata` now emits a `test` field indicating if a target has
2298 tests enabled.][cargo/8478]
2299 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2300 - [`cargo-publish` will now use an alternative registry by default if it's the
2301 only registry specified in `package.publish`.][cargo/8571]
2305 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2306 type based search.][75366]
2307 - [Added the Ayu theme to rustdoc.][71237]
2311 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2312 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2313 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2314 help to preserve more span information.][73084] These changes may cause
2315 compiliation errors if your macro was unhygenic or didn't correctly handle
2317 - [Moved support for the CloudABI target to tier 3.][75568]
2318 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2319 - [Added the `rustc-docs` component.][75560] This allows you to install
2320 and read the documentation for the compiler internal APIs. (Currently only
2321 available for `x86_64-unknown-linux-gnu`.)
2326 - [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.
2328 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2329 [75048]: https://github.com/rust-lang/rust/pull/75048/
2330 [74163]: https://github.com/rust-lang/rust/pull/74163/
2331 [71237]: https://github.com/rust-lang/rust/pull/71237/
2332 [74869]: https://github.com/rust-lang/rust/pull/74869/
2333 [73858]: https://github.com/rust-lang/rust/pull/73858/
2334 [75716]: https://github.com/rust-lang/rust/pull/75716/
2335 [75560]: https://github.com/rust-lang/rust/pull/75560/
2336 [75568]: https://github.com/rust-lang/rust/pull/75568/
2337 [75366]: https://github.com/rust-lang/rust/pull/75366/
2338 [75204]: https://github.com/rust-lang/rust/pull/75204/
2339 [74650]: https://github.com/rust-lang/rust/pull/74650/
2340 [74419]: https://github.com/rust-lang/rust/pull/74419/
2341 [73964]: https://github.com/rust-lang/rust/pull/73964/
2342 [74021]: https://github.com/rust-lang/rust/pull/74021/
2343 [74060]: https://github.com/rust-lang/rust/pull/74060/
2344 [73893]: https://github.com/rust-lang/rust/pull/73893/
2345 [73526]: https://github.com/rust-lang/rust/pull/73526/
2346 [73583]: https://github.com/rust-lang/rust/pull/73583/
2347 [73084]: https://github.com/rust-lang/rust/pull/73084/
2348 [73197]: https://github.com/rust-lang/rust/pull/73197/
2349 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2350 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2351 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2352 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2353 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2354 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2355 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2356 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2357 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2358 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2359 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2360 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2361 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2362 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2365 Version 1.46.0 (2020-08-27)
2366 ==========================
2370 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2371 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2372 const functions.][73862]
2373 - [The `#[track_caller]` attribute can now be added to functions to use the
2374 function's caller's location information for panic messages.][72445]
2375 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2376 `x.0.0` over `(x.0).0`.
2377 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2378 You currently can't use `mem::transmute` in constant functions.
2382 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2383 - [Enabled static "Position Independent Executables" by default
2384 for `x86_64-unknown-linux-musl`.][70740]
2388 - [`mem::forget` is now a `const fn`.][73887]
2389 - [`String` now implements `From<char>`.][73466]
2390 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2391 integer types.][73032]
2392 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2393 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2394 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2395 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2396 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2397 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2402 - [`vec::Drain::as_slice`]
2406 Added a number of new environment variables that are now available when
2407 compiling your crate.
2409 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2410 the specific binary being compiled and the name of the crate.
2411 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2412 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2416 - [The target configuration option `abi_blacklist` has been renamed
2417 to `unsupported_abis`.][74150] The old name will still continue to work.
2418 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2419 This was previously accepted but will become a hard error in a future release.
2420 - [Rustc will fail to compile if you have a struct with
2421 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2423 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2424 ensure that spans have the correct information, and may cause breakage if you
2425 were relying on receiving spans with dummy information.
2426 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2427 a legacy installer that was replaced by a MSI installer a few years ago but
2428 was still being built.
2429 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2430 - [Rustc will no longer accept overlapping trait implementations that only
2431 differ in how the lifetime was bound.][72493]
2432 - [Rustc now correctly relates the lifetime of an existential associated
2433 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2434 you to pass a shorter lifetime than expected.
2435 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2436 The library will need to be installed for `rustc` to work, even though we
2437 expect it to be already available on most systems.
2438 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2440 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2441 exact output returned by rustc's pretty printing is an unstable
2442 implementation detail: we recommend any macro relying on it to switch to a
2443 more robust parsing system.
2445 [75453]: https://github.com/rust-lang/rust/issues/75453/
2446 [74820]: https://github.com/rust-lang/rust/issues/74820/
2447 [74420]: https://github.com/rust-lang/rust/issues/74420/
2448 [74109]: https://github.com/rust-lang/rust/pull/74109/
2449 [74150]: https://github.com/rust-lang/rust/pull/74150/
2450 [73862]: https://github.com/rust-lang/rust/pull/73862/
2451 [73887]: https://github.com/rust-lang/rust/pull/73887/
2452 [73466]: https://github.com/rust-lang/rust/pull/73466/
2453 [73516]: https://github.com/rust-lang/rust/pull/73516/
2454 [73293]: https://github.com/rust-lang/rust/pull/73293/
2455 [73007]: https://github.com/rust-lang/rust/pull/73007/
2456 [73032]: https://github.com/rust-lang/rust/pull/73032/
2457 [72920]: https://github.com/rust-lang/rust/pull/72920/
2458 [72569]: https://github.com/rust-lang/rust/pull/72569/
2459 [72583]: https://github.com/rust-lang/rust/pull/72583/
2460 [72584]: https://github.com/rust-lang/rust/pull/72584/
2461 [72717]: https://github.com/rust-lang/rust/pull/72717/
2462 [72437]: https://github.com/rust-lang/rust/pull/72437/
2463 [72445]: https://github.com/rust-lang/rust/pull/72445/
2464 [72486]: https://github.com/rust-lang/rust/pull/72486/
2465 [72493]: https://github.com/rust-lang/rust/pull/72493/
2466 [72331]: https://github.com/rust-lang/rust/pull/72331/
2467 [71896]: https://github.com/rust-lang/rust/pull/71896/
2468 [71660]: https://github.com/rust-lang/rust/pull/71660/
2469 [71322]: https://github.com/rust-lang/rust/pull/71322/
2470 [70740]: https://github.com/rust-lang/rust/pull/70740/
2471 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2472 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2473 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2474 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2475 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2478 Version 1.45.2 (2020-08-03)
2479 ==========================
2481 * [Fix bindings in tuple struct patterns][74954]
2482 * [Fix track_caller integration with trait objects][74784]
2484 [74954]: https://github.com/rust-lang/rust/issues/74954
2485 [74784]: https://github.com/rust-lang/rust/issues/74784
2488 Version 1.45.1 (2020-07-30)
2489 ==========================
2491 * [Fix const propagation with references.][73613]
2492 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2493 * [Avoid spurious implicit region bound.][74509]
2494 * [Install clippy on x.py install][74457]
2496 [73613]: https://github.com/rust-lang/rust/pull/73613
2497 [73078]: https://github.com/rust-lang/rust/issues/73078
2498 [74509]: https://github.com/rust-lang/rust/pull/74509
2499 [74457]: https://github.com/rust-lang/rust/pull/74457
2502 Version 1.45.0 (2020-07-16)
2503 ==========================
2507 - [Out of range float to int conversions using `as` has been defined as a saturating
2508 conversion.][71269] This was previously undefined behaviour, but you can use the
2509 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2510 may be desirable in rare performance sensitive situations.
2511 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2512 using `u64`.][70705]
2513 - [Function like procedural macros can now be used in expression, pattern, and statement
2514 positions.][68717] This means you can now use a function-like procedural macro
2515 anywhere you can use a declarative (`macro_rules!`) macro.
2519 - [You can now override individual target features through the `target-feature`
2520 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2521 equivalent to `-C target-feature=+avx2,+fma`.
2522 - [Added the `force-unwind-tables` flag.][69984] This option allows
2523 rustc to always generate unwind tables regardless of panic strategy.
2524 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2525 to include LLVM bitcode into generated `rlib`s (this is on by default).
2526 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2527 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2528 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2529 - [Upgraded to LLVM 10.][67759]
2531 \* Refer to Rust's [platform support page][platform-support-doc] for more
2532 information on Rust's tiered platform support.
2537 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2539 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2540 - [You can now use `char` with
2541 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2542 a range of codepoints.][72413] E.g.
2543 you can now write the following;
2545 for ch in 'a'..='z' {
2549 // Prints "abcdefghijklmnopqrstuvwxyz"
2551 - [`OsString` now implements `FromStr`.][71662]
2552 - [The `saturating_neg` method has been added to all signed integer primitive
2553 types, and the `saturating_abs` method has been added for all integer
2554 primitive types.][71886]
2555 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2556 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2558 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2559 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2560 integer types.][69813]
2561 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2562 integer types.][72324]
2563 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2568 - [`BTreeMap::remove_entry`]
2570 - [`rc::Weak::as_ptr`]
2571 - [`rc::Weak::from_raw`]
2572 - [`rc::Weak::into_raw`]
2573 - [`str::strip_prefix`]
2574 - [`str::strip_suffix`]
2575 - [`sync::Weak::as_ptr`]
2576 - [`sync::Weak::from_raw`]
2577 - [`sync::Weak::into_raw`]
2578 - [`char::UNICODE_VERSION`]
2579 - [`Span::resolved_at`]
2580 - [`Span::located_at`]
2581 - [`Span::mixed_site`]
2582 - [`unix::process::CommandExt::arg0`]
2587 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2592 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2593 `~~outdated information~~` becomes "~~outdated information~~".
2594 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2598 - [Trying to self initialize a static value (that is creating a value using
2599 itself) is unsound and now causes a compile error.][71140]
2600 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2601 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2602 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2603 previously undocumented and not intended for public use. Rustdoc still provides
2604 a non-zero exit code on errors.
2605 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2606 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2607 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2608 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2609 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2613 - [Make clippy a git subtree instead of a git submodule][70655]
2614 - [Unify the undo log of all snapshot types][69464]
2616 [71848]: https://github.com/rust-lang/rust/issues/71848/
2617 [73420]: https://github.com/rust-lang/rust/issues/73420/
2618 [72324]: https://github.com/rust-lang/rust/pull/72324/
2619 [71843]: https://github.com/rust-lang/rust/pull/71843/
2620 [71886]: https://github.com/rust-lang/rust/pull/71886/
2621 [72234]: https://github.com/rust-lang/rust/pull/72234/
2622 [72239]: https://github.com/rust-lang/rust/pull/72239/
2623 [72397]: https://github.com/rust-lang/rust/pull/72397/
2624 [72413]: https://github.com/rust-lang/rust/pull/72413/
2625 [72014]: https://github.com/rust-lang/rust/pull/72014/
2626 [72062]: https://github.com/rust-lang/rust/pull/72062/
2627 [72094]: https://github.com/rust-lang/rust/pull/72094/
2628 [72133]: https://github.com/rust-lang/rust/pull/72133/
2629 [67759]: https://github.com/rust-lang/rust/pull/67759/
2630 [71900]: https://github.com/rust-lang/rust/pull/71900/
2631 [71928]: https://github.com/rust-lang/rust/pull/71928/
2632 [71662]: https://github.com/rust-lang/rust/pull/71662/
2633 [71716]: https://github.com/rust-lang/rust/pull/71716/
2634 [71447]: https://github.com/rust-lang/rust/pull/71447/
2635 [71269]: https://github.com/rust-lang/rust/pull/71269/
2636 [71095]: https://github.com/rust-lang/rust/pull/71095/
2637 [71140]: https://github.com/rust-lang/rust/pull/71140/
2638 [70655]: https://github.com/rust-lang/rust/pull/70655/
2639 [70705]: https://github.com/rust-lang/rust/pull/70705/
2640 [69984]: https://github.com/rust-lang/rust/pull/69984/
2641 [69813]: https://github.com/rust-lang/rust/pull/69813/
2642 [69464]: https://github.com/rust-lang/rust/pull/69464/
2643 [68717]: https://github.com/rust-lang/rust/pull/68717/
2644 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2645 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2646 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2647 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2648 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2649 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2650 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2651 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2652 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2653 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2654 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2655 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2656 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2657 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2658 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2659 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2660 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2663 Version 1.44.1 (2020-06-18)
2664 ===========================
2666 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2667 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2668 * [Fix crashes when finding backtrace on macOS.][71397]
2669 * [Clippy applies lint levels into different files.][clippy/5356]
2671 [71397]: https://github.com/rust-lang/rust/issues/71397
2672 [73078]: https://github.com/rust-lang/rust/issues/73078
2673 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2674 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2677 Version 1.44.0 (2020-06-04)
2678 ==========================
2682 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2683 - [Added the `unused_braces` lint.][70081]
2685 **Syntax-only changes**
2687 - [Expansion-driven outline module parsing][69838]
2692 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2697 These are still rejected semantically, so you will likely receive an error but
2698 these changes can be seen and parsed by macros and conditional compilation.
2702 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2703 Additionally when in incremental mode rustc defaults to 256 codegen units.
2704 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2705 a panic is thrown.][67502]
2706 - [Added tier 3\* support for the `aarch64-unknown-none` and
2707 `aarch64-unknown-none-softfloat` targets.][68334]
2708 - [Added tier 3 support for `arm64-apple-tvos` and
2709 `x86_64-apple-tvos` targets.][68191]
2714 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2715 `vec![]` to be able to be used in `const` contexts.
2716 - [`convert::Infallible` now implements `Hash`.][70281]
2717 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2718 a `&mut OsStr`.][70048]
2719 - [Unicode 13 is now supported.][69929]
2720 - [`String` now implements `From<&mut str>`.][69661]
2721 - [`IoSlice` now implements `Copy`.][69403]
2722 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2723 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2724 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2725 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2726 integer types.][69373]
2730 - [`PathBuf::with_capacity`]
2731 - [`PathBuf::capacity`]
2732 - [`PathBuf::clear`]
2733 - [`PathBuf::reserve`]
2734 - [`PathBuf::reserve_exact`]
2735 - [`PathBuf::shrink_to_fit`]
2736 - [`f32::to_int_unchecked`]
2737 - [`f64::to_int_unchecked`]
2738 - [`Layout::align_to`]
2739 - [`Layout::pad_to_align`]
2741 - [`Layout::extend`]
2745 - [Added the `cargo tree` command which will print a tree graph of
2746 your dependencies.][cargo/8062] E.g.
2748 mdbook v0.3.2 (/Users/src/rust/mdbook)
2750 │ ├── html5ever v0.24.0
2752 │ │ │ └── cfg-if v0.1.9
2754 │ │ └── markup5ever v0.9.0
2755 │ │ ├── log v0.4.8 (*)
2757 │ │ │ └── phf_shared v0.7.24
2758 │ │ │ ├── siphasher v0.2.3
2759 │ │ │ └── unicase v1.4.2
2760 │ │ │ [build-dependencies]
2761 │ │ │ └── version_check v0.1.5
2764 You can also display dependencies on multiple versions of the same crate with
2765 `cargo tree -d` (short for `cargo tree --duplicates`).
2769 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2770 the version in the sidebar.][69494]
2774 - [Rustc now correctly generates static libraries on Windows GNU targets with
2775 the `.a` extension, rather than the previous `.lib`.][70937]
2776 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2777 - [The `file_name` property in JSON output of macro errors now points the actual
2778 source file rather than the previous format of `<NAME macros>`.][70969]
2779 **Note:** this may not point to a file that actually exists on the user's system.
2780 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2781 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2782 not allow zero initialization such as `NonZeroU8`.][66059] This was
2783 previously a warning.
2784 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2785 operator has been defined as a saturating operation.][71269] This was previously
2786 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2787 continue using the current behaviour, which may be desirable in rare performance
2788 sensitive situations.
2792 These changes provide no direct user facing benefits, but represent significant
2793 improvements to the internals and overall performance of rustc and
2796 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2797 - [Replace big JS dict with JSON parsing.][71250]
2799 [69373]: https://github.com/rust-lang/rust/pull/69373/
2800 [66059]: https://github.com/rust-lang/rust/pull/66059/
2801 [68191]: https://github.com/rust-lang/rust/pull/68191/
2802 [68899]: https://github.com/rust-lang/rust/pull/68899/
2803 [71147]: https://github.com/rust-lang/rust/pull/71147/
2804 [71250]: https://github.com/rust-lang/rust/pull/71250/
2805 [70937]: https://github.com/rust-lang/rust/pull/70937/
2806 [70969]: https://github.com/rust-lang/rust/pull/70969/
2807 [70632]: https://github.com/rust-lang/rust/pull/70632/
2808 [70281]: https://github.com/rust-lang/rust/pull/70281/
2809 [70345]: https://github.com/rust-lang/rust/pull/70345/
2810 [70048]: https://github.com/rust-lang/rust/pull/70048/
2811 [70081]: https://github.com/rust-lang/rust/pull/70081/
2812 [70156]: https://github.com/rust-lang/rust/pull/70156/
2813 [71269]: https://github.com/rust-lang/rust/pull/71269/
2814 [69838]: https://github.com/rust-lang/rust/pull/69838/
2815 [69929]: https://github.com/rust-lang/rust/pull/69929/
2816 [69661]: https://github.com/rust-lang/rust/pull/69661/
2817 [69778]: https://github.com/rust-lang/rust/pull/69778/
2818 [69494]: https://github.com/rust-lang/rust/pull/69494/
2819 [69403]: https://github.com/rust-lang/rust/pull/69403/
2820 [69033]: https://github.com/rust-lang/rust/pull/69033/
2821 [68692]: https://github.com/rust-lang/rust/pull/68692/
2822 [68334]: https://github.com/rust-lang/rust/pull/68334/
2823 [67502]: https://github.com/rust-lang/rust/pull/67502/
2824 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2825 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2826 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2827 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2828 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2829 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2830 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2831 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2832 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2833 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2834 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2835 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2836 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2839 Version 1.43.1 (2020-05-07)
2840 ===========================
2842 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2843 * [Fixed the stabilization of AVX-512 features.][71473]
2844 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2846 [71430]: https://github.com/rust-lang/rust/pull/71430
2847 [71473]: https://github.com/rust-lang/rust/issues/71473
2848 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2851 Version 1.43.0 (2020-04-23)
2852 ==========================
2856 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2857 the type inferred correctly.][68129]
2858 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2860 **Syntax only changes**
2861 - [Allow `type Foo: Ord` syntactically.][69361]
2862 - [Fuse associated and extern items up to defaultness.][69194]
2863 - [Syntactically allow `self` in all `fn` contexts.][68764]
2864 - [Merge `fn` syntax + cleanup item parsing.][68728]
2865 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2866 For example, you may now write:
2868 macro_rules! mac_trait {
2878 These are still rejected *semantically*, so you will likely receive an error but
2879 these changes can be seen and parsed by macros and
2880 conditional compilation.
2885 - [You can now pass multiple lint flags to rustc to override the previous
2886 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2887 everything in the `unused` lint group except `unused-variables` which
2888 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2889 everything in the `unused` lint group **including** `unused-variables` since
2890 the allow flag is specified before the deny flag (and therefore overridden).
2891 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2892 if they are available on `windows-gnu`.][67429]
2893 - [rustc now buffers errors/warnings printed in JSON.][69227]
2897 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2898 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2899 respectively.][69538] **Note** These conversions are only available when `N`
2901 - [You can now use associated constants on floats and integers directly, rather
2902 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2903 `f32::NAN` with no imports.
2904 - [`u8::is_ascii` is now `const`.][68984]
2905 - [`String` now implements `AsMut<str>`.][68742]
2906 - [Added the `primitive` module to `std` and `core`.][67637] This module
2907 reexports Rust's primitive types. This is mainly useful in macros
2908 where you want avoid these types being shadowed.
2909 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2910 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2914 - [`Once::is_completed`]
2919 - [`iter::once_with`]
2923 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2924 your environment.][cargo/7823]
2925 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2926 executable path when running integration tests or benchmarks.][cargo/7697]
2927 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2928 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2932 - [Certain checks in the `const_err` lint were deemed unrelated to const
2933 evaluation][69185], and have been moved to the `unconditional_panic` and
2934 `arithmetic_overflow` lints.
2939 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2940 has been a warning since 1.36.0.
2941 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2942 led to some instances being accepted, and now correctly emits a hard error.
2944 [69340]: https://github.com/rust-lang/rust/pull/69340
2948 These changes provide no direct user facing benefits, but represent significant
2949 improvements to the internals and overall performance of `rustc` and
2952 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2953 - [Improved how rustc generates drop code.][67332]
2954 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2955 - [traits: preallocate 2 Vecs of known initial size][69022]
2956 - [Avoid exponential behaviour when relating types][68772]
2957 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2958 - [Improve performance of coherence checks][68966]
2959 - [Deduplicate types in the generator witness][68672]
2960 - [Invert control in struct_lint_level.][68725]
2962 [67332]: https://github.com/rust-lang/rust/pull/67332/
2963 [67429]: https://github.com/rust-lang/rust/pull/67429/
2964 [67637]: https://github.com/rust-lang/rust/pull/67637/
2965 [67642]: https://github.com/rust-lang/rust/pull/67642/
2966 [67878]: https://github.com/rust-lang/rust/pull/67878/
2967 [67885]: https://github.com/rust-lang/rust/pull/67885/
2968 [68129]: https://github.com/rust-lang/rust/pull/68129/
2969 [68672]: https://github.com/rust-lang/rust/pull/68672/
2970 [68725]: https://github.com/rust-lang/rust/pull/68725/
2971 [68728]: https://github.com/rust-lang/rust/pull/68728/
2972 [68738]: https://github.com/rust-lang/rust/pull/68738/
2973 [68742]: https://github.com/rust-lang/rust/pull/68742/
2974 [68764]: https://github.com/rust-lang/rust/pull/68764/
2975 [68772]: https://github.com/rust-lang/rust/pull/68772/
2976 [68943]: https://github.com/rust-lang/rust/pull/68943/
2977 [68952]: https://github.com/rust-lang/rust/pull/68952/
2978 [68966]: https://github.com/rust-lang/rust/pull/68966/
2979 [68984]: https://github.com/rust-lang/rust/pull/68984/
2980 [69022]: https://github.com/rust-lang/rust/pull/69022/
2981 [69185]: https://github.com/rust-lang/rust/pull/69185/
2982 [69194]: https://github.com/rust-lang/rust/pull/69194/
2983 [69201]: https://github.com/rust-lang/rust/pull/69201/
2984 [69227]: https://github.com/rust-lang/rust/pull/69227/
2985 [69548]: https://github.com/rust-lang/rust/pull/69548/
2986 [69256]: https://github.com/rust-lang/rust/pull/69256/
2987 [69361]: https://github.com/rust-lang/rust/pull/69361/
2988 [69366]: https://github.com/rust-lang/rust/pull/69366/
2989 [69538]: https://github.com/rust-lang/rust/pull/69538/
2990 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2991 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2992 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2993 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2994 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2995 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2996 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2997 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3000 Version 1.42.0 (2020-03-12)
3001 ==========================
3005 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3007 fn foo(words: &[&str]) {
3009 ["Hello", "World", "!", ..] => println!("Hello World!"),
3010 ["Foo", "Bar", ..] => println!("Baz"),
3011 rest => println!("{:?}", rest),
3015 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3016 that you can create an enum that has the exact layout and ABI of the type
3018 - [You can now use outer attribute procedural macros on inline modules.][64273]
3019 - [There are some *syntax-only* changes:][67131]
3020 - `default` is syntactically allowed before items in `trait` definitions.
3021 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3022 leave out their bodies in favor of `;`.
3023 - Bounds on associated types in `impl`s are now syntactically allowed
3024 (e.g. `type Foo: Ord;`).
3025 - `...` (the C-variadic type) may occur syntactically directly as the type of
3026 any function parameter.
3028 These are still rejected *semantically*, so you will likely receive an error
3029 but these changes can be seen and parsed by procedural macros and
3030 conditional compilation.
3034 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3035 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3036 - [`Option::{expect,unwrap}` and
3037 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3038 pointing to the location where they were called, rather than
3039 `core`'s internals. ][67887]
3041 \* Refer to Rust's [platform support page][platform-support-doc] for more
3042 information on Rust's tiered platform support.
3046 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3047 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3048 to implement `Sized`.][67935]
3049 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3050 - [`Layout::new` is now `const`.][66254]
3051 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3056 - [`CondVar::wait_while`]
3057 - [`CondVar::wait_timeout_while`]
3059 - [`DebugMap::value`]
3060 - [`ManuallyDrop::take`]
3062 - [`ptr::slice_from_raw_parts_mut`]
3063 - [`ptr::slice_from_raw_parts`]
3067 - [You no longer need to include `extern crate proc_macro;` to be able to
3068 `use proc_macro;` in the `2018` edition.][cargo/7700]
3072 - [`Error::description` has been deprecated, and its use will now produce a
3073 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3075 [68253]: https://github.com/rust-lang/rust/pull/68253/
3076 [68348]: https://github.com/rust-lang/rust/pull/68348/
3077 [67935]: https://github.com/rust-lang/rust/pull/67935/
3078 [68339]: https://github.com/rust-lang/rust/pull/68339/
3079 [68122]: https://github.com/rust-lang/rust/pull/68122/
3080 [64273]: https://github.com/rust-lang/rust/pull/64273/
3081 [67712]: https://github.com/rust-lang/rust/pull/67712/
3082 [67887]: https://github.com/rust-lang/rust/pull/67887/
3083 [67131]: https://github.com/rust-lang/rust/pull/67131/
3084 [67233]: https://github.com/rust-lang/rust/pull/67233/
3085 [66899]: https://github.com/rust-lang/rust/pull/66899/
3086 [66919]: https://github.com/rust-lang/rust/pull/66919/
3087 [66254]: https://github.com/rust-lang/rust/pull/66254/
3088 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3089 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3090 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3091 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3092 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3093 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3094 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3095 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3096 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3099 Version 1.41.1 (2020-02-27)
3100 ===========================
3102 * [Always check types of static items][69145]
3103 * [Always check lifetime bounds of `Copy` impls][69145]
3104 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3106 [69225]: https://github.com/rust-lang/rust/issues/69225
3107 [69145]: https://github.com/rust-lang/rust/pull/69145
3110 Version 1.41.0 (2020-01-30)
3111 ===========================
3116 - [You can now pass type parameters to foreign items when implementing
3117 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3118 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3119 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3120 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3121 - [You can now use any valid identifier in a `format_args` macro.][66847]
3122 Previously identifiers starting with an underscore were not allowed.
3123 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3124 enum variants.][66183] These are still rejected semantically, but
3125 can be seen and parsed by procedural macros and conditional compilation.
3126 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3127 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3128 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3130 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3135 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3136 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3137 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3138 - [You can now pass an arguments file passing the `@path` syntax
3139 to rustc.][66172] Note that the format differs somewhat from what is
3140 found in other tooling; please see [the documentation][argfile-docs] for
3142 - [You can now provide `--extern` flag without a path, indicating that it is
3143 available from the search path or specified with an `-L` flag.][64882]
3145 \* Refer to Rust's [platform support page][platform-support-doc] for more
3146 information on Rust's tiered platform support.
3148 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3153 - [The `core::panic` module is now stable.][66771] It was already stable
3155 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3156 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3157 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3162 - [`Result::map_or`]
3163 - [`Result::map_or_else`]
3164 - [`std::rc::Weak::weak_count`]
3165 - [`std::rc::Weak::strong_count`]
3166 - [`std::sync::Weak::weak_count`]
3167 - [`std::sync::Weak::strong_count`]
3172 - [Cargo will now document all the private items for binary crates
3173 by default.][cargo/7593]
3174 - [`cargo-install` will now reinstall the package if it detects that it is out
3175 of date.][cargo/7560]
3176 - [Cargo.lock now uses a more git friendly format that should help to reduce
3177 merge conflicts.][cargo/7579]
3178 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3179 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3180 optimisation level to `2` for debug builds. You can also use
3181 `[profile.<profile>.build-override]` to override build scripts and
3187 - [You can now specify `edition` in documentation code blocks to compile the block
3188 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3189 should be compiled the 2018 edition of Rust.
3190 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3191 current theme with `--check-theme`.][54733]
3192 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3197 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3198 Apple targets.][apple-32bit-drop] This means that the source code is still
3199 available to build, but the targets are no longer being tested and release
3200 binaries for those platforms will no longer be distributed by the Rust project.
3201 Please refer to the linked blog post for more information.
3203 [54733]: https://github.com/rust-lang/rust/pull/54733/
3204 [61351]: https://github.com/rust-lang/rust/pull/61351/
3205 [62514]: https://github.com/rust-lang/rust/pull/62514/
3206 [67255]: https://github.com/rust-lang/rust/pull/67255/
3207 [66661]: https://github.com/rust-lang/rust/pull/66661/
3208 [66771]: https://github.com/rust-lang/rust/pull/66771/
3209 [66847]: https://github.com/rust-lang/rust/pull/66847/
3210 [66238]: https://github.com/rust-lang/rust/pull/66238/
3211 [66277]: https://github.com/rust-lang/rust/pull/66277/
3212 [66325]: https://github.com/rust-lang/rust/pull/66325/
3213 [66172]: https://github.com/rust-lang/rust/pull/66172/
3214 [66183]: https://github.com/rust-lang/rust/pull/66183/
3215 [65879]: https://github.com/rust-lang/rust/pull/65879/
3216 [65013]: https://github.com/rust-lang/rust/pull/65013/
3217 [64882]: https://github.com/rust-lang/rust/pull/64882/
3218 [64325]: https://github.com/rust-lang/rust/pull/64325/
3219 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3220 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3221 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3222 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3223 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3224 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3225 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3226 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3227 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3228 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3229 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3231 Version 1.40.0 (2019-12-19)
3232 ===========================
3236 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3237 `const` contexts.][65188] e.g.
3240 pub struct Point(i32, i32);
3242 const ORIGIN: Point = {
3243 let constructor = Point;
3249 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3250 indicate that there may be variants or fields added in the future.][64639]
3251 For example this requires adding a wild-card branch (`_ => {}`) to any match
3252 statements on a non-exhaustive `enum`. [(RFC 2008)]
3253 - [You can now use function-like procedural macros in `extern` blocks and in
3254 type positions.][63931] e.g. `type Generated = macro!();`
3255 - [Function-like and attribute procedural macros can now emit
3256 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3257 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3258 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3259 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3263 - [Added tier 3 support\* for the
3264 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3265 - [Added tier 3 support for the
3266 `aarch64-unknown-none-softfloat` target.][64589]
3267 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3268 `mips64el-unknown-linux-muslabi64` targets.][65843]
3270 \* Refer to Rust's [platform support page][platform-support-doc] for more
3271 information on Rust's tiered platform support.
3275 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3279 - [`BTreeMap::get_key_value`]
3280 - [`HashMap::get_key_value`]
3281 - [`Option::as_deref_mut`]
3282 - [`Option::as_deref`]
3283 - [`Option::flatten`]
3284 - [`UdpSocket::peer_addr`]
3285 - [`f32::to_be_bytes`]
3286 - [`f32::to_le_bytes`]
3287 - [`f32::to_ne_bytes`]
3288 - [`f64::to_be_bytes`]
3289 - [`f64::to_le_bytes`]
3290 - [`f64::to_ne_bytes`]
3291 - [`f32::from_be_bytes`]
3292 - [`f32::from_le_bytes`]
3293 - [`f32::from_ne_bytes`]
3294 - [`f64::from_be_bytes`]
3295 - [`f64::from_le_bytes`]
3296 - [`f64::from_ne_bytes`]
3303 - [Cargo will now always display warnings, rather than only on
3304 fresh builds.][cargo/7450]
3305 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3306 now produce an error.][cargo/7507] Previously these flags were ignored.
3307 - [You can now publish `dev-dependencies` without including
3308 a `version`.][cargo/7333]
3312 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3313 when running documentation tests with `rustdoc`.][63803]
3317 - [As previously announced, any previous NLL warnings in the 2015 edition are
3318 now hard errors.][64221]
3319 - [The `include!` macro will now warn if it failed to include the
3320 entire file.][64284] The `include!` macro unintentionally only includes the
3321 first _expression_ in a file, and this can be unintuitive. This will become
3322 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3323 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3324 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3325 or `extern` blocks now correctly emits a hard error.
3327 [65294]: https://github.com/rust-lang/rust/pull/65294/
3328 [66103]: https://github.com/rust-lang/rust/pull/66103/
3329 [65843]: https://github.com/rust-lang/rust/pull/65843/
3330 [65188]: https://github.com/rust-lang/rust/pull/65188/
3331 [65092]: https://github.com/rust-lang/rust/pull/65092/
3332 [64589]: https://github.com/rust-lang/rust/pull/64589/
3333 [64639]: https://github.com/rust-lang/rust/pull/64639/
3334 [64221]: https://github.com/rust-lang/rust/pull/64221/
3335 [64284]: https://github.com/rust-lang/rust/pull/64284/
3336 [63931]: https://github.com/rust-lang/rust/pull/63931/
3337 [64035]: https://github.com/rust-lang/rust/pull/64035/
3338 [63674]: https://github.com/rust-lang/rust/pull/63674/
3339 [63803]: https://github.com/rust-lang/rust/pull/63803/
3340 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3341 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3342 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3343 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3344 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3345 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3346 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3347 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3348 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3349 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3350 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3351 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3352 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3353 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3354 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3355 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3356 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3357 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3358 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3359 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3360 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3361 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3362 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3363 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3364 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3367 Version 1.39.0 (2019-11-07)
3368 ===========================
3372 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3373 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3374 - [You can now use certain attributes on function, closure, and function pointer
3375 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3376 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3377 attributes applied to items. e.g.
3380 #[cfg(windows)] slice: &[u16],
3381 #[cfg(not(windows))] slice: &[u8],
3386 - [You can now take shared references to bind-by-move patterns in the `if` guards
3387 of `match` arms.][63118] e.g.
3390 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3394 // ---- `nums` is bound by move.
3395 if nums.iter().sum::<u8>() == 10
3396 // ^------ `.iter()` implicitly takes a reference to `nums`.
3399 // ----------- Legal as `nums` was bound by move and so we have ownership.
3401 _ => unreachable!(),
3410 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3411 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3412 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3413 **Note** Cargo currently doesn't use this feature. Refer to
3414 [cargo#7315][cargo/7315] to track this feature's progress.
3415 - [You can now pass `--show-output` argument to test binaries to print the
3416 output of successful tests.][62600]
3419 \* Refer to Rust's [platform support page][platform-support-doc] for more
3420 information on Rust's tiered platform support.
3424 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3425 - [`LinkedList::new` is now a `const` function.][63684]
3426 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3427 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3428 now `const`.][63786]
3432 - [`Pin::into_inner`]
3433 - [`Instant::checked_duration_since`]
3434 - [`Instant::saturating_duration_since`]
3438 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3439 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3440 `--all` is now deprecated.
3444 - [You can now pass `-Clinker` to rustdoc to control the linker used
3445 for compiling doctests.][63834]
3449 - [Code that was previously accepted by the old borrow checker, but rejected by
3450 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3451 previously a warning, and will also become a hard error in the Rust 2015
3452 edition in the 1.40.0 release.
3453 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3454 run tests.][63827] This should improve performance when running a large
3456 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3457 recommended to use the `?` operator instead.
3458 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3461 [62600]: https://github.com/rust-lang/rust/pull/62600/
3462 [62672]: https://github.com/rust-lang/rust/pull/62672/
3463 [63118]: https://github.com/rust-lang/rust/pull/63118/
3464 [63209]: https://github.com/rust-lang/rust/pull/63209/
3465 [63402]: https://github.com/rust-lang/rust/pull/63402/
3466 [63565]: https://github.com/rust-lang/rust/pull/63565/
3467 [63595]: https://github.com/rust-lang/rust/pull/63595/
3468 [63684]: https://github.com/rust-lang/rust/pull/63684/
3469 [63698]: https://github.com/rust-lang/rust/pull/63698/
3470 [63770]: https://github.com/rust-lang/rust/pull/63770/
3471 [63786]: https://github.com/rust-lang/rust/pull/63786/
3472 [63827]: https://github.com/rust-lang/rust/pull/63827/
3473 [63834]: https://github.com/rust-lang/rust/pull/63834/
3474 [64010]: https://github.com/rust-lang/rust/pull/64010/
3475 [64028]: https://github.com/rust-lang/rust/pull/64028/
3476 [64334]: https://github.com/rust-lang/rust/pull/64334/
3477 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3478 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3479 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3480 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3481 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3482 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3484 Version 1.38.0 (2019-09-26)
3485 ==========================
3489 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3490 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3494 - [Added pipelined compilation support to `rustc`.][62766] This will
3495 improve compilation times in some cases. For further information please refer
3496 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3497 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3498 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3499 `x86_64-uwp-windows-msvc` targets.][60260]
3500 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3501 `armv7-unknown-linux-musleabi` targets.][63107]
3502 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3503 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3504 - [Upgraded to LLVM 9.][62592]
3506 \* Refer to Rust's [platform support page][platform-support-doc] for more
3507 information on Rust's tiered platform support.
3511 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3512 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3513 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3514 is available at `std::clone::Clone`). This also makes all built-in macros
3515 available in `std`/`core` root. e.g. `std::include_bytes!`.
3516 - [`str::Chars` now implements `Debug`.][63000]
3517 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3518 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3519 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3520 - [Added euclidean remainder and division operations (`div_euclid`,
3521 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3522 `overflowing`, and `wrapping` versions are available for all
3524 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3525 `PartialEq`.][61491]
3526 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3530 - [`<*const T>::cast`]
3531 - [`<*mut T>::cast`]
3532 - [`Duration::as_secs_f32`]
3533 - [`Duration::as_secs_f64`]
3534 - [`Duration::div_f32`]
3535 - [`Duration::div_f64`]
3536 - [`Duration::from_secs_f32`]
3537 - [`Duration::from_secs_f64`]
3538 - [`Duration::mul_f32`]
3539 - [`Duration::mul_f64`]
3540 - [`any::type_name`]
3544 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3545 - [You can now pass the `--features` option multiple times to enable
3546 multiple features.][cargo/7084]
3551 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3555 - [`rustc` will now warn about some incorrect uses of
3556 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3560 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3562 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3563 issues][62896] with certain crates such as libc.
3565 [60260]: https://github.com/rust-lang/rust/pull/60260/
3566 [61457]: https://github.com/rust-lang/rust/pull/61457/
3567 [61491]: https://github.com/rust-lang/rust/pull/61491/
3568 [61884]: https://github.com/rust-lang/rust/pull/61884/
3569 [61953]: https://github.com/rust-lang/rust/pull/61953/
3570 [62042]: https://github.com/rust-lang/rust/pull/62042/
3571 [62528]: https://github.com/rust-lang/rust/pull/62528/
3572 [62583]: https://github.com/rust-lang/rust/pull/62583/
3573 [62735]: https://github.com/rust-lang/rust/pull/62735/
3574 [62766]: https://github.com/rust-lang/rust/pull/62766/
3575 [62784]: https://github.com/rust-lang/rust/pull/62784/
3576 [62592]: https://github.com/rust-lang/rust/pull/62592/
3577 [62785]: https://github.com/rust-lang/rust/issues/62785/
3578 [62814]: https://github.com/rust-lang/rust/pull/62814/
3579 [62896]: https://github.com/rust-lang/rust/issues/62896/
3580 [63000]: https://github.com/rust-lang/rust/pull/63000/
3581 [63056]: https://github.com/rust-lang/rust/pull/63056/
3582 [63107]: https://github.com/rust-lang/rust/pull/63107/
3583 [63346]: https://github.com/rust-lang/rust/pull/63346/
3584 [63421]: https://github.com/rust-lang/rust/pull/63421/
3585 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3586 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3587 [63048]: https://github.com/rust-lang/rust/pull/63048
3588 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3589 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3590 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3591 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3592 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3593 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3594 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3595 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3596 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3597 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3598 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3599 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3600 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3602 Version 1.37.0 (2019-08-15)
3603 ==========================
3607 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3608 [`Box`][62228], or an [array][62235] and unused.
3609 - [You can now use the `cfg` and `cfg_attr` attributes on
3610 generic parameters.][61547]
3611 - [You can now use enum variants through type alias.][61682] e.g. You can
3612 write the following:
3614 type MyOption = Option<u8>;
3616 fn increment_or_zero(x: MyOption) -> u8 {
3618 MyOption::Some(y) => y + 1,
3619 MyOption::None => 0,
3623 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3624 `const _: u32 = 5;`.
3625 - [You can now use `#[repr(align(X)]` on enums.][61229]
3626 - [The `?` Kleene macro operator is now available in the
3627 2015 edition.][60932]
3631 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3632 and `-C profile-use` flags.][61268] For more information on how to use profile
3633 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3634 - [The `rust-lldb` wrapper script should now work again.][61827]
3638 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3642 - [`BufReader::buffer`]
3643 - [`BufWriter::buffer`]
3644 - [`Cell::from_mut`]
3645 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3646 - [`DoubleEndedIterator::nth_back`]
3648 - [`Wrapping::reverse_bits`]
3649 - [`i128::reverse_bits`]
3650 - [`i16::reverse_bits`]
3651 - [`i32::reverse_bits`]
3652 - [`i64::reverse_bits`]
3653 - [`i8::reverse_bits`]
3654 - [`isize::reverse_bits`]
3655 - [`slice::copy_within`]
3656 - [`u128::reverse_bits`]
3657 - [`u16::reverse_bits`]
3658 - [`u32::reverse_bits`]
3659 - [`u64::reverse_bits`]
3660 - [`u8::reverse_bits`]
3661 - [`usize::reverse_bits`]
3665 - [`Cargo.lock` files are now included by default when publishing executable crates
3666 with executables.][cargo/7026]
3667 - [You can now specify `default-run="foo"` in `[package]` to specify the
3668 default executable to use for `cargo run`.][cargo/7056]
3675 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3676 Please transition your code to using the `..=` syntax for inclusive
3678 - [Using a trait object without the `dyn` will now warn by default.][61203]
3679 Please transition your code to use `dyn Trait` for trait objects instead.
3681 [62228]: https://github.com/rust-lang/rust/pull/62228/
3682 [62235]: https://github.com/rust-lang/rust/pull/62235/
3683 [61802]: https://github.com/rust-lang/rust/pull/61802/
3684 [61827]: https://github.com/rust-lang/rust/pull/61827/
3685 [61547]: https://github.com/rust-lang/rust/pull/61547/
3686 [61682]: https://github.com/rust-lang/rust/pull/61682/
3687 [61268]: https://github.com/rust-lang/rust/pull/61268/
3688 [61342]: https://github.com/rust-lang/rust/pull/61342/
3689 [61347]: https://github.com/rust-lang/rust/pull/61347/
3690 [61100]: https://github.com/rust-lang/rust/pull/61100/
3691 [61203]: https://github.com/rust-lang/rust/pull/61203/
3692 [61229]: https://github.com/rust-lang/rust/pull/61229/
3693 [60932]: https://github.com/rust-lang/rust/pull/60932/
3694 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3695 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3696 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3697 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3698 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3699 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3700 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3701 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3702 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3703 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3704 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3705 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3706 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3707 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3708 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3709 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3710 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3711 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3712 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3713 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3714 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3715 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3716 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3719 Version 1.36.0 (2019-07-04)
3720 ==========================
3724 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3725 - [The order of traits in trait objects no longer affects the semantics of that
3726 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3727 `dyn fmt::Debug + Send`, where this was previously not the case.
3731 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3732 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3733 - [`mem::needs_drop` is now available as a const fn.][60364]
3734 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3735 - [`String` now implements `BorrowMut<str>`.][60404]
3736 - [`io::Cursor` now implements `Default`.][60234]
3737 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3738 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3739 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3740 environment has access to heap memory allocation.
3741 - [`String` now implements `From<&String>`.][59825]
3742 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3743 return a tuple of each argument when there is multiple arguments.
3744 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3749 - [`VecDeque::rotate_left`]
3750 - [`VecDeque::rotate_right`]
3751 - [`Iterator::copied`]
3753 - [`io::IoSliceMut`]
3754 - [`Read::read_vectored`]
3755 - [`Write::write_vectored`]
3756 - [`str::as_mut_ptr`]
3757 - [`mem::MaybeUninit`]
3758 - [`pointer::align_offset`]
3759 - [`future::Future`]
3761 - [`task::RawWaker`]
3762 - [`task::RawWakerVTable`]
3768 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3769 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3771 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3775 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3782 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3783 longer recommended, and will be deprecated in 1.39.0.
3785 [60318]: https://github.com/rust-lang/rust/pull/60318/
3786 [60364]: https://github.com/rust-lang/rust/pull/60364/
3787 [60370]: https://github.com/rust-lang/rust/pull/60370/
3788 [60404]: https://github.com/rust-lang/rust/pull/60404/
3789 [60234]: https://github.com/rust-lang/rust/pull/60234/
3790 [60244]: https://github.com/rust-lang/rust/pull/60244/
3791 [58623]: https://github.com/rust-lang/rust/pull/58623/
3792 [59648]: https://github.com/rust-lang/rust/pull/59648/
3793 [59675]: https://github.com/rust-lang/rust/pull/59675/
3794 [59825]: https://github.com/rust-lang/rust/pull/59825/
3795 [59826]: https://github.com/rust-lang/rust/pull/59826/
3796 [59445]: https://github.com/rust-lang/rust/pull/59445/
3797 [59114]: https://github.com/rust-lang/rust/pull/59114/
3798 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3799 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3800 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3801 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3802 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3803 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3804 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3805 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3806 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3807 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3808 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3809 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3810 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3811 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3812 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3813 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3814 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3815 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3816 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3817 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3820 Version 1.35.0 (2019-05-23)
3821 ==========================
3825 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3826 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3827 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3829 unsafe fn call_unsafe(func: unsafe fn()) {
3834 unsafe { call_unsafe(|| {}); }
3841 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3842 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3843 - [Added the `wasm32-unknown-wasi` target.][59464]
3848 - [`Thread` will now show its ID in `Debug` output.][59460]
3849 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3850 - [`alloc::System` now implements `Default`.][59451]
3851 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3853 - [`char::{ToLowercase, ToUppercase}` now
3854 implement `ExactSizeIterator`.][58778]
3855 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3856 - [Removed the `Read` trait bounds
3857 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3858 - [You can now call the `dbg!` macro without any parameters to print the file
3859 and line where it is called.][57847]
3860 - [In place ASCII case conversions are now up to 4× faster.][59283]
3861 e.g. `str::make_ascii_lowercase`
3862 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3869 - [`RefCell::replace_with`]
3870 - [`RefCell::map_split`]
3872 - [`Range::contains`]
3873 - [`RangeFrom::contains`]
3874 - [`RangeTo::contains`]
3875 - [`RangeInclusive::contains`]
3876 - [`RangeToInclusive::contains`]
3877 - [`Option::copied`]
3881 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3882 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3887 - [The Rust toolchain is now available natively for musl based distros.][58575]
3889 [59460]: https://github.com/rust-lang/rust/pull/59460/
3890 [59464]: https://github.com/rust-lang/rust/pull/59464/
3891 [59500]: https://github.com/rust-lang/rust/pull/59500/
3892 [59512]: https://github.com/rust-lang/rust/pull/59512/
3893 [59580]: https://github.com/rust-lang/rust/pull/59580/
3894 [59283]: https://github.com/rust-lang/rust/pull/59283/
3895 [59451]: https://github.com/rust-lang/rust/pull/59451/
3896 [59076]: https://github.com/rust-lang/rust/pull/59076/
3897 [58778]: https://github.com/rust-lang/rust/pull/58778/
3898 [58717]: https://github.com/rust-lang/rust/pull/58717/
3899 [58369]: https://github.com/rust-lang/rust/pull/58369/
3900 [58423]: https://github.com/rust-lang/rust/pull/58423/
3901 [58080]: https://github.com/rust-lang/rust/pull/58080/
3902 [57847]: https://github.com/rust-lang/rust/pull/57847/
3903 [58575]: https://github.com/rust-lang/rust/pull/58575
3904 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3905 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3906 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3907 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3908 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3909 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3910 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3911 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3912 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3913 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3914 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3915 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3917 Version 1.34.2 (2019-05-14)
3918 ===========================
3920 * [Destabilize the `Error::type_id` function due to a security
3921 vulnerability][60785] ([CVE-2019-12083])
3923 [60785]: https://github.com/rust-lang/rust/pull/60785
3924 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3926 Version 1.34.1 (2019-04-25)
3927 ===========================
3929 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3930 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3931 * [Fix Clippy panic when checking some macros][clippy/3805]
3933 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3934 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3935 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3937 Version 1.34.0 (2019-04-11)
3938 ==========================
3942 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3943 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3945 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3946 `#[attr{}]` procedural macros.][57367]
3947 - [You can now write `extern crate self as foo;`][57407] to import your
3948 crate's root into the extern prelude.
3953 - [You can now target `riscv64imac-unknown-none-elf` and
3954 `riscv64gc-unknown-none-elf`.][58406]
3955 - [You can now enable linker plugin LTO optimisations with
3956 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3957 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3959 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3964 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3965 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3966 the `Hash` trait to create an iterator.
3967 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3968 methods.][58421] Most notably you no longer require the `Ord` trait to create
3970 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3971 for all numeric types.][58044]
3972 - [Indexing a `str` is now generic over all types that
3973 implement `SliceIndex<str>`.][57604]
3974 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3975 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3976 produce a warning if their returning type is unused.
3977 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3978 `overflowing_pow` are now available for all numeric types.][57873] These are
3979 equivalent to methods such as `wrapping_add` for the `pow` operation.
3987 * [`Error::type_id`]
3988 * [`atomic::AtomicI16`]
3989 * [`atomic::AtomicI32`]
3990 * [`atomic::AtomicI64`]
3991 * [`atomic::AtomicI8`]
3992 * [`atomic::AtomicU16`]
3993 * [`atomic::AtomicU32`]
3994 * [`atomic::AtomicU64`]
3995 * [`atomic::AtomicU8`]
3996 * [`convert::Infallible`]
3997 * [`convert::TryFrom`]
3998 * [`convert::TryInto`]
4000 * [`iter::successors`]
4001 * [`num::NonZeroI128`]
4002 * [`num::NonZeroI16`]
4003 * [`num::NonZeroI32`]
4004 * [`num::NonZeroI64`]
4005 * [`num::NonZeroI8`]
4006 * [`num::NonZeroIsize`]
4007 * [`slice::sort_by_cached_key`]
4008 * [`str::escape_debug`]
4009 * [`str::escape_default`]
4010 * [`str::escape_unicode`]
4011 * [`str::split_ascii_whitespace`]
4014 * [`Instant::checked_add`]
4015 * [`Instant::checked_sub`]
4016 * [`SystemTime::checked_add`]
4017 * [`SystemTime::checked_sub`]
4021 - [You can now use alternative registries to crates.io.][cargo/6654]
4025 - [You can now use the `?` operator in your documentation tests without manually
4026 adding `fn main() -> Result<(), _> {}`.][56470]
4030 - [`Command::before_exec` is being replaced by the unsafe method
4031 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4032 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4033 can now use `const` functions in `static` variables.
4035 [58370]: https://github.com/rust-lang/rust/pull/58370/
4036 [58406]: https://github.com/rust-lang/rust/pull/58406/
4037 [58421]: https://github.com/rust-lang/rust/pull/58421/
4038 [58166]: https://github.com/rust-lang/rust/pull/58166/
4039 [58044]: https://github.com/rust-lang/rust/pull/58044/
4040 [58057]: https://github.com/rust-lang/rust/pull/58057/
4041 [58059]: https://github.com/rust-lang/rust/pull/58059/
4042 [57809]: https://github.com/rust-lang/rust/pull/57809/
4043 [57873]: https://github.com/rust-lang/rust/pull/57873/
4044 [57604]: https://github.com/rust-lang/rust/pull/57604/
4045 [57367]: https://github.com/rust-lang/rust/pull/57367/
4046 [57407]: https://github.com/rust-lang/rust/pull/57407/
4047 [57425]: https://github.com/rust-lang/rust/pull/57425/
4048 [57106]: https://github.com/rust-lang/rust/pull/57106/
4049 [56470]: https://github.com/rust-lang/rust/pull/56470/
4050 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4051 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4052 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4053 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4054 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4055 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4056 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4057 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4058 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4059 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4060 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4061 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4062 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4063 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4064 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4065 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4066 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4067 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4068 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4069 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4070 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4071 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4072 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4073 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4074 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4075 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4076 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4077 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4078 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4079 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4080 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4083 Version 1.33.0 (2019-02-28)
4084 ==========================
4088 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4089 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4090 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4091 E.g. You can have match statement on a `u8` that covers `0..=255` and
4092 you would no longer be required to have a `_ => unreachable!()` case.
4093 - [You can now have multiple patterns in `if let` and `while let`
4094 expressions.][57532] You can do this with the same syntax as a `match`
4104 let state = Creature::Crab("Ferris");
4106 if let Creature::Crab(name) | Creature::Person(name) = state {
4107 println!("This creature's name is: {}", name);
4111 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4112 this feature will by default produce a warning as this behaviour can be
4113 unintuitive. E.g. `if let _ = 5 {}`
4114 - [You can now use `let` bindings, assignments, expression statements,
4115 and irrefutable pattern destructuring in const functions.][57175]
4116 - [You can now call unsafe const functions.][57067] E.g.
4118 const unsafe fn foo() -> i32 { 5 }
4119 const fn bar() -> i32 {
4123 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4124 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4125 - [You can now specify a specific alignment with the `#[repr(packed)]`
4126 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4127 with an alignment of 2 bytes and a size of 6 bytes.
4128 - [You can now import an item from a module as an `_`.][56303] This allows you to
4129 import a trait's impls, and not have the name in the namespace. E.g.
4131 use std::io::Read as _;
4133 // Allowed as there is only one `Read` in the module.
4136 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4140 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4141 command line argument.][56351]
4142 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4143 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4144 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4145 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4146 information on Rust's platform support.
4147 - [Added support for the `thumbv7neon-linux-androideabi` and
4148 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4149 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4153 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4154 functions for all numeric types.][57566]
4155 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4156 are now `const` functions for all numeric types.][57105]
4157 - [The methods `is_positive` and `is_negative` are now `const` functions for
4158 all signed numeric types.][57105]
4159 - [The `get` method for all `NonZero` types is now `const`.][57167]
4160 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4161 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4162 numeric types.][57234]
4163 - [`Ipv4Addr::new` is now a `const` function][57234]
4167 - [`unix::FileExt::read_exact_at`]
4168 - [`unix::FileExt::write_all_at`]
4169 - [`Option::transpose`]
4170 - [`Result::transpose`]
4171 - [`convert::identity`]
4174 - [`marker::PhantomPinned`]
4175 - [`Vec::resize_with`]
4176 - [`VecDeque::resize_with`]
4177 - [`Duration::as_millis`]
4178 - [`Duration::as_micros`]
4179 - [`Duration::as_nanos`]
4184 - [You can now publish crates that require a feature flag to compile with
4185 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4186 - [Cargo should now rebuild a crate if a file was modified during the initial
4191 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4192 are now deprecated in the standard library, and their usage will now produce a warning.
4193 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4195 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4197 - [Libtest no longer creates a new thread for each test when
4198 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4200 [56243]: https://github.com/rust-lang/rust/pull/56243
4201 [56303]: https://github.com/rust-lang/rust/pull/56303/
4202 [56351]: https://github.com/rust-lang/rust/pull/56351/
4203 [56362]: https://github.com/rust-lang/rust/pull/56362
4204 [56642]: https://github.com/rust-lang/rust/pull/56642/
4205 [56769]: https://github.com/rust-lang/rust/pull/56769/
4206 [56805]: https://github.com/rust-lang/rust/pull/56805
4207 [56947]: https://github.com/rust-lang/rust/pull/56947/
4208 [57049]: https://github.com/rust-lang/rust/pull/57049/
4209 [57067]: https://github.com/rust-lang/rust/pull/57067/
4210 [57105]: https://github.com/rust-lang/rust/pull/57105
4211 [57130]: https://github.com/rust-lang/rust/pull/57130/
4212 [57167]: https://github.com/rust-lang/rust/pull/57167/
4213 [57175]: https://github.com/rust-lang/rust/pull/57175/
4214 [57234]: https://github.com/rust-lang/rust/pull/57234/
4215 [57332]: https://github.com/rust-lang/rust/pull/57332/
4216 [57465]: https://github.com/rust-lang/rust/pull/57465/
4217 [57532]: https://github.com/rust-lang/rust/pull/57532/
4218 [57535]: https://github.com/rust-lang/rust/pull/57535/
4219 [57566]: https://github.com/rust-lang/rust/pull/57566/
4220 [57615]: https://github.com/rust-lang/rust/pull/57615/
4221 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4222 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4223 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4224 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4225 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4226 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4227 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4228 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4229 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4230 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4231 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4232 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4233 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4234 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4235 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4236 [platform-support]: https://forge.rust-lang.org/platform-support.html
4238 Version 1.32.0 (2019-01-17)
4239 ==========================
4244 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4245 operator allows you to specify zero or one repetitions similar to the `*` and
4247 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4248 now always resolve to the item (`enum`, `struct`, etc.) available in the
4249 module if present, before resolving to a external crate or an item the prelude.][56759]
4252 enum Color { Red, Green, Blue }
4258 - [You can now match against `PhantomData<T>` types.][55837]
4259 - [You can now match against literals in macros with the `literal`
4260 specifier.][56072] This will match against a literal of any type.
4261 E.g. `1`, `'A'`, `"Hello World"`
4262 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4264 struct Point(i32, i32);
4267 pub fn new(x: i32, y: i32) -> Self {
4271 pub fn is_origin(&self) -> bool {
4279 - [Self can also now be used in type definitions.][56366] E.g.
4283 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4286 Cons(T, Box<Self>) // likewise here
4289 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4290 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4294 - [The default allocator has changed from jemalloc to the default allocator on
4295 your system.][55238] The compiler itself on Linux & macOS will still use
4296 jemalloc, but programs compiled with it will use the system allocator.
4297 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4301 - [`PathBuf` now implements `FromStr`.][55148]
4302 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4303 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4304 easily debug expressions in your rust program. E.g.
4307 let b = dbg!(a * 2) + 1;
4308 // ^-- prints: [src/main.rs:4] a * 2 = 4
4312 The following APIs are now `const` functions and can be used in a
4316 - [`UnsafeCell::get`]
4317 - [`char::is_ascii`]
4319 - [`ManuallyDrop::new`]
4320 - [`ManuallyDrop::into_inner`]
4321 - [`RangeInclusive::start`]
4322 - [`RangeInclusive::end`]
4323 - [`NonNull::as_ptr`]
4326 - [`Duration::as_secs`]
4327 - [`Duration::subsec_millis`]
4328 - [`Duration::subsec_micros`]
4329 - [`Duration::subsec_nanos`]
4331 - [`Ipv4Addr::is_unspecified`]
4333 - [`Ipv6Addr::octets`]
4337 - [`i8::to_be_bytes`]
4338 - [`i8::to_le_bytes`]
4339 - [`i8::to_ne_bytes`]
4340 - [`i8::from_be_bytes`]
4341 - [`i8::from_le_bytes`]
4342 - [`i8::from_ne_bytes`]
4343 - [`i16::to_be_bytes`]
4344 - [`i16::to_le_bytes`]
4345 - [`i16::to_ne_bytes`]
4346 - [`i16::from_be_bytes`]
4347 - [`i16::from_le_bytes`]
4348 - [`i16::from_ne_bytes`]
4349 - [`i32::to_be_bytes`]
4350 - [`i32::to_le_bytes`]
4351 - [`i32::to_ne_bytes`]
4352 - [`i32::from_be_bytes`]
4353 - [`i32::from_le_bytes`]
4354 - [`i32::from_ne_bytes`]
4355 - [`i64::to_be_bytes`]
4356 - [`i64::to_le_bytes`]
4357 - [`i64::to_ne_bytes`]
4358 - [`i64::from_be_bytes`]
4359 - [`i64::from_le_bytes`]
4360 - [`i64::from_ne_bytes`]
4361 - [`i128::to_be_bytes`]
4362 - [`i128::to_le_bytes`]
4363 - [`i128::to_ne_bytes`]
4364 - [`i128::from_be_bytes`]
4365 - [`i128::from_le_bytes`]
4366 - [`i128::from_ne_bytes`]
4367 - [`isize::to_be_bytes`]
4368 - [`isize::to_le_bytes`]
4369 - [`isize::to_ne_bytes`]
4370 - [`isize::from_be_bytes`]
4371 - [`isize::from_le_bytes`]
4372 - [`isize::from_ne_bytes`]
4373 - [`u8::to_be_bytes`]
4374 - [`u8::to_le_bytes`]
4375 - [`u8::to_ne_bytes`]
4376 - [`u8::from_be_bytes`]
4377 - [`u8::from_le_bytes`]
4378 - [`u8::from_ne_bytes`]
4379 - [`u16::to_be_bytes`]
4380 - [`u16::to_le_bytes`]
4381 - [`u16::to_ne_bytes`]
4382 - [`u16::from_be_bytes`]
4383 - [`u16::from_le_bytes`]
4384 - [`u16::from_ne_bytes`]
4385 - [`u32::to_be_bytes`]
4386 - [`u32::to_le_bytes`]
4387 - [`u32::to_ne_bytes`]
4388 - [`u32::from_be_bytes`]
4389 - [`u32::from_le_bytes`]
4390 - [`u32::from_ne_bytes`]
4391 - [`u64::to_be_bytes`]
4392 - [`u64::to_le_bytes`]
4393 - [`u64::to_ne_bytes`]
4394 - [`u64::from_be_bytes`]
4395 - [`u64::from_le_bytes`]
4396 - [`u64::from_ne_bytes`]
4397 - [`u128::to_be_bytes`]
4398 - [`u128::to_le_bytes`]
4399 - [`u128::to_ne_bytes`]
4400 - [`u128::from_be_bytes`]
4401 - [`u128::from_le_bytes`]
4402 - [`u128::from_ne_bytes`]
4403 - [`usize::to_be_bytes`]
4404 - [`usize::to_le_bytes`]
4405 - [`usize::to_ne_bytes`]
4406 - [`usize::from_be_bytes`]
4407 - [`usize::from_le_bytes`]
4408 - [`usize::from_ne_bytes`]
4412 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4413 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4417 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4421 - [The argument types for AVX's
4422 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4423 been changed from `*const` to `*mut` as the previous implementation
4427 [55148]: https://github.com/rust-lang/rust/pull/55148/
4428 [55238]: https://github.com/rust-lang/rust/pull/55238/
4429 [55280]: https://github.com/rust-lang/rust/pull/55280/
4430 [55610]: https://github.com/rust-lang/rust/pull/55610/
4431 [55663]: https://github.com/rust-lang/rust/pull/55663/
4432 [55702]: https://github.com/rust-lang/rust/pull/55702/
4433 [55837]: https://github.com/rust-lang/rust/pull/55837/
4434 [55843]: https://github.com/rust-lang/rust/pull/55843/
4435 [56072]: https://github.com/rust-lang/rust/pull/56072/
4436 [56245]: https://github.com/rust-lang/rust/pull/56245/
4437 [56365]: https://github.com/rust-lang/rust/pull/56365/
4438 [56366]: https://github.com/rust-lang/rust/pull/56366/
4439 [56395]: https://github.com/rust-lang/rust/pull/56395/
4440 [56759]: https://github.com/rust-lang/rust/pull/56759/
4441 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4442 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4443 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4444 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4445 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4446 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4447 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4448 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4449 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4450 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4451 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4452 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4453 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4454 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4455 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4456 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4457 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4458 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4459 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4460 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4461 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4462 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4463 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4464 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4465 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4466 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4467 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4468 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4469 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4470 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4471 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4472 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4473 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4474 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4475 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4476 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4477 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4478 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4479 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4480 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4481 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4482 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4483 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4484 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4485 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4486 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4487 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4488 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4489 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4490 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4491 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4492 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4493 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4494 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4495 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4496 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4497 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4498 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4499 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4500 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4501 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4502 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4503 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4504 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4505 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4506 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4507 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4508 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4509 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4510 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4511 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4512 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4513 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4514 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4515 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4516 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4517 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4518 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4519 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4520 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4521 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4522 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4523 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4524 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4525 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4526 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4527 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4528 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4529 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4530 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4531 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4532 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4533 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4536 Version 1.31.1 (2018-12-20)
4537 ===========================
4539 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4540 - [Fix broken go-to-definition in RLS][rls/1171]
4541 - [Fix infinite loop on hover in RLS][rls/1170]
4543 [56562]: https://github.com/rust-lang/rust/pull/56562
4544 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4545 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4547 Version 1.31.0 (2018-12-06)
4548 ==========================
4552 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4553 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4554 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4555 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4557 - [You can now define and use `const` functions.][54835] These are currently
4558 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4559 [language reference][const-reference] for what exactly is available.
4560 - [You can now use tool lints, which allow you to scope lints from external
4561 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4562 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4563 a crate, not just in exported functions.][54451]
4564 - [You can now use parentheses in pattern matches.][54497]
4568 - [Updated musl to 1.1.20][54430]
4572 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4573 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4574 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4575 into `Option<&mut T>` using the `From` trait.][53218]
4576 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4581 - [`slice::align_to`]
4582 - [`slice::align_to_mut`]
4583 - [`slice::chunks_exact`]
4584 - [`slice::chunks_exact_mut`]
4585 - [`slice::rchunks`]
4586 - [`slice::rchunks_mut`]
4587 - [`slice::rchunks_exact`]
4588 - [`slice::rchunks_exact_mut`]
4589 - [`Option::replace`]
4593 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4594 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4595 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4597 [52813]: https://github.com/rust-lang/rust/pull/52813/
4598 [53218]: https://github.com/rust-lang/rust/pull/53218/
4599 [54057]: https://github.com/rust-lang/rust/pull/54057/
4600 [54240]: https://github.com/rust-lang/rust/pull/54240/
4601 [54430]: https://github.com/rust-lang/rust/pull/54430/
4602 [54451]: https://github.com/rust-lang/rust/pull/54451/
4603 [54497]: https://github.com/rust-lang/rust/pull/54497/
4604 [54778]: https://github.com/rust-lang/rust/pull/54778/
4605 [54835]: https://github.com/rust-lang/rust/pull/54835/
4606 [54870]: https://github.com/rust-lang/rust/pull/54870/
4607 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4608 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4609 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4610 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4611 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4612 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4613 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4614 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4615 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4616 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4617 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4618 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4619 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4620 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4622 Version 1.30.1 (2018-11-08)
4623 ===========================
4625 - [Fixed overflow ICE in rustdoc][54199]
4626 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4628 [54199]: https://github.com/rust-lang/rust/pull/54199
4629 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4631 Version 1.30.0 (2018-10-25)
4632 ==========================
4636 - [Procedural macros are now available.][52081] These kinds of macros allow for
4637 more powerful code generation. There is a [new chapter available][proc-macros]
4638 in the Rust Programming Language book that goes further in depth.
4639 - [You can now use keywords as identifiers using the raw identifiers
4640 syntax (`r#`),][53236] e.g. `let r#for = true;`
4641 - [Using anonymous parameters in traits is now deprecated with a warning and
4642 will be a hard error in the 2018 edition.][53272]
4643 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4644 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4645 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4646 Previously, using a external crate in a module without a use statement
4647 required `let json = ::serde_json::from_str(foo);` but can now be written
4648 as `let json = serde_json::from_str(foo);`.
4649 - [You can now apply the `#[used]` attribute to static items to prevent the
4650 compiler from optimising them away, even if they appear to be unused,][51363]
4651 e.g. `#[used] static FOO: u32 = 1;`
4652 - [You can now import and reexport macros from other crates with the `use`
4653 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4654 the root module of the crate. If your macro relies on calling other local
4655 macros, it is recommended to export with the
4656 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4658 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4659 using the `vis` specifier.][53370]
4660 - [Non-macro attributes now allow all forms of literals, not just
4661 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4662 write `#[attr(true)]`.
4663 - [You can now specify a function to handle a panic in the Rust runtime with the
4664 `#[panic_handler]` attribute.][51366]
4668 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4669 - [Added the `aarch64-unknown-netbsd` target][53165]
4670 - [Upgraded to LLVM 8.][53611]
4674 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4678 - [`Ipv4Addr::BROADCAST`]
4679 - [`Ipv4Addr::LOCALHOST`]
4680 - [`Ipv4Addr::UNSPECIFIED`]
4681 - [`Ipv6Addr::LOCALHOST`]
4682 - [`Ipv6Addr::UNSPECIFIED`]
4683 - [`Iterator::find_map`]
4685 The following methods are replacement methods for `trim_left`, `trim_right`,
4686 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4688 - [`str::trim_end_matches`]
4690 - [`str::trim_start_matches`]
4691 - [`str::trim_start`]
4695 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4696 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4697 equivalent to calling `rustdoc --error-format=json`.
4698 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4702 - [`rustdoc` allows you to specify what edition to treat your code as with the
4703 `--edition` option.][54057]
4704 - [`rustdoc` now has the `--color` (specify whether to output color) and
4705 `--error-format` (specify error format, e.g. `json`) options.][53003]
4706 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4707 debug symbols.][53774]
4708 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4709 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4711 [50911]: https://github.com/rust-lang/rust/pull/50911/
4712 [51363]: https://github.com/rust-lang/rust/pull/51363/
4713 [51366]: https://github.com/rust-lang/rust/pull/51366/
4714 [52081]: https://github.com/rust-lang/rust/pull/52081/
4715 [53003]: https://github.com/rust-lang/rust/pull/53003/
4716 [53033]: https://github.com/rust-lang/rust/pull/53033/
4717 [53044]: https://github.com/rust-lang/rust/pull/53044/
4718 [53165]: https://github.com/rust-lang/rust/pull/53165/
4719 [53611]: https://github.com/rust-lang/rust/pull/53611/
4720 [53236]: https://github.com/rust-lang/rust/pull/53236/
4721 [53272]: https://github.com/rust-lang/rust/pull/53272/
4722 [53370]: https://github.com/rust-lang/rust/pull/53370/
4723 [53459]: https://github.com/rust-lang/rust/pull/53459/
4724 [53774]: https://github.com/rust-lang/rust/pull/53774/
4725 [53822]: https://github.com/rust-lang/rust/pull/53822/
4726 [54057]: https://github.com/rust-lang/rust/pull/54057/
4727 [54404]: https://github.com/rust-lang/rust/pull/54404/
4728 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4729 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4730 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4731 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4733 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4734 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4735 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4736 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4737 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4738 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4739 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4740 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4741 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4742 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4745 Version 1.29.2 (2018-10-11)
4746 ===========================
4748 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4749 - The `rls-preview` component on the windows-gnu targets has been restored.
4751 [54639]: https://github.com/rust-lang/rust/pull/54639
4754 Version 1.29.1 (2018-09-25)
4755 ===========================
4760 - The standard library's `str::repeat` function contained an out of bounds write
4761 caused by an integer overflow. This has been fixed by deterministically
4762 panicking when an overflow happens.
4764 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4768 Version 1.29.0 (2018-09-13)
4769 ==========================
4773 - [Bumped minimum LLVM version to 5.0.][51899]
4774 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4775 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4776 - [Upgraded to LLVM 7.][51966]
4780 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4781 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4782 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4783 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4785 - [`Cell<T>` now allows `T` to be unsized.][50494]
4786 - [`SocketAddr` is now stable on Redox.][52656]
4791 - [`Iterator::flatten`]
4796 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4797 `--locked` to disable this behavior.
4798 - [`cargo-install` will now allow you to cross compile an install
4799 using `--target`.][cargo/5614]
4800 - [Added the `cargo-fix` subcommand to automatically move project code from
4801 2015 edition to 2018.][cargo/5723]
4802 - [`cargo doc` can now optionally document private types using the
4803 `--document-private-items` flag.][cargo/5543]
4807 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4808 the specified level to that level.][52354] For example `--cap-lints warn`
4809 will demote `deny` and `forbid` lints to `warn`.
4810 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4811 fails and `101` if there is a panic.][52197]
4812 - [A preview of clippy has been made available through rustup.][51122]
4813 You can install the preview with `rustup component add clippy-preview`.
4817 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4818 Use `str::get_unchecked(begin..end)` instead.
4819 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4820 Consider using the `home_dir` function from
4821 https://crates.io/crates/dirs instead.
4822 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4823 - [`cfg` attributes and `--cfg` command line flags are now more
4824 strictly validated.][53893]
4826 [53893]: https://github.com/rust-lang/rust/pull/53893/
4827 [52861]: https://github.com/rust-lang/rust/pull/52861/
4828 [51966]: https://github.com/rust-lang/rust/pull/51966/
4829 [52656]: https://github.com/rust-lang/rust/pull/52656/
4830 [52239]: https://github.com/rust-lang/rust/pull/52239/
4831 [52330]: https://github.com/rust-lang/rust/pull/52330/
4832 [52354]: https://github.com/rust-lang/rust/pull/52354/
4833 [52402]: https://github.com/rust-lang/rust/pull/52402/
4834 [52197]: https://github.com/rust-lang/rust/pull/52197/
4835 [51807]: https://github.com/rust-lang/rust/pull/51807/
4836 [51899]: https://github.com/rust-lang/rust/pull/51899/
4837 [51912]: https://github.com/rust-lang/rust/pull/51912/
4838 [51619]: https://github.com/rust-lang/rust/pull/51619/
4839 [51656]: https://github.com/rust-lang/rust/pull/51656/
4840 [51178]: https://github.com/rust-lang/rust/pull/51178/
4841 [51122]: https://github.com/rust-lang/rust/pull/51122
4842 [50494]: https://github.com/rust-lang/rust/pull/50494/
4843 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4844 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4845 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4846 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4847 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4848 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4849 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4852 Version 1.28.0 (2018-08-02)
4853 ===========================
4857 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4858 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4859 the inner type across Foreign Function Interface (FFI) boundaries.
4860 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4861 and can now be used as identifiers.][51196]
4862 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4863 stable.][51241] This will allow users to specify a global allocator for
4865 - [Unit test functions marked with the `#[test]` attribute can now return
4866 `Result<(), E: Debug>` in addition to `()`.][51298]
4867 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4868 allows macros to easily target lifetimes.
4872 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4873 prioritise making smaller binary sizes. `z` is the same as `s` with the
4874 exception that it does not vectorise loops, which typically results in an even
4876 - [The short error format is now stable.][49546] Specified with
4877 `--error-format=short` this option will provide a more compressed output of
4878 rust error messages.
4879 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4880 - [Reduced the number of allocations in the macro parser.][50855] This can
4881 improve compile times of macro heavy crates on average by 5%.
4885 - [Implemented `Default` for `&mut str`.][51306]
4886 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4887 - [Implemented `Extend` for `()`.][50234]
4888 - [The `Debug` implementation of `time::Duration` should now be more easily
4889 human readable.][50364] Previously a `Duration` of one second would printed as
4890 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4891 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4892 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4893 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4894 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4895 for `PathBuf`.][50170]
4896 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4897 and `Wrapping<i128>`.][50465]
4898 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4899 possible.][51050] This can provide up to a 40% speed increase.
4900 - [Improved error messages when using `format!`.][50610]
4904 - [`Iterator::step_by`]
4905 - [`Path::ancestors`]
4906 - [`SystemTime::UNIX_EPOCH`]
4907 - [`alloc::GlobalAlloc`]
4909 - [`alloc::LayoutErr`]
4912 - [`alloc::alloc_zeroed`]
4913 - [`alloc::dealloc`]
4914 - [`alloc::realloc`]
4915 - [`alloc::handle_alloc_error`]
4916 - [`btree_map::Entry::or_default`]
4917 - [`fmt::Alignment`]
4918 - [`hash_map::Entry::or_default`]
4919 - [`iter::repeat_with`]
4920 - [`num::NonZeroUsize`]
4921 - [`num::NonZeroU128`]
4922 - [`num::NonZeroU16`]
4923 - [`num::NonZeroU32`]
4924 - [`num::NonZeroU64`]
4925 - [`num::NonZeroU8`]
4926 - [`ops::RangeBounds`]
4927 - [`slice::SliceIndex`]
4928 - [`slice::from_mut`]
4929 - [`slice::from_ref`]
4930 - [`{Any + Send + Sync}::downcast_mut`]
4931 - [`{Any + Send + Sync}::downcast_ref`]
4932 - [`{Any + Send + Sync}::is`]
4936 - [Cargo will now no longer allow you to publish crates with build scripts that
4937 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4938 considered to be immutable.
4942 - [The `suggestion_applicability` field in `rustc`'s json output is now
4943 stable.][50486] This will allow dev tools to check whether a code suggestion
4944 would apply to them.
4948 - [Rust will consider trait objects with duplicated constraints to be the same
4949 type as without the duplicated constraint.][51276] For example the below code will
4950 now fail to compile.
4955 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4958 impl Trait + Send + Send {
4959 fn test(&self) { println!("two"); }
4963 [49546]: https://github.com/rust-lang/rust/pull/49546/
4964 [50143]: https://github.com/rust-lang/rust/pull/50143/
4965 [50170]: https://github.com/rust-lang/rust/pull/50170/
4966 [50234]: https://github.com/rust-lang/rust/pull/50234/
4967 [50265]: https://github.com/rust-lang/rust/pull/50265/
4968 [50364]: https://github.com/rust-lang/rust/pull/50364/
4969 [50385]: https://github.com/rust-lang/rust/pull/50385/
4970 [50465]: https://github.com/rust-lang/rust/pull/50465/
4971 [50486]: https://github.com/rust-lang/rust/pull/50486/
4972 [50554]: https://github.com/rust-lang/rust/pull/50554/
4973 [50610]: https://github.com/rust-lang/rust/pull/50610/
4974 [50855]: https://github.com/rust-lang/rust/pull/50855/
4975 [51050]: https://github.com/rust-lang/rust/pull/51050/
4976 [51196]: https://github.com/rust-lang/rust/pull/51196/
4977 [51241]: https://github.com/rust-lang/rust/pull/51241/
4978 [51276]: https://github.com/rust-lang/rust/pull/51276/
4979 [51298]: https://github.com/rust-lang/rust/pull/51298/
4980 [51306]: https://github.com/rust-lang/rust/pull/51306/
4981 [51562]: https://github.com/rust-lang/rust/pull/51562/
4982 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4983 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4984 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4985 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4986 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4987 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4988 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4989 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4990 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4991 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4992 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4993 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4994 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4995 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4996 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4997 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4998 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4999 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5000 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5001 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5002 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5003 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5004 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5005 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5006 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5007 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5008 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5009 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5010 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5011 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5013 Version 1.27.2 (2018-07-20)
5014 ===========================
5019 - The borrow checker was fixed to avoid potential unsoundness when using
5020 match ergonomics: [#52213][52213].
5022 [52213]: https://github.com/rust-lang/rust/issues/52213
5024 Version 1.27.1 (2018-07-10)
5025 ===========================
5030 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5031 when running, which enabled executing code as some other user on a
5032 given machine. This release fixes that vulnerability; you can read
5033 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5035 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5040 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5041 match ergonomics: [#51415][51415], [#49534][49534].
5043 [51415]: https://github.com/rust-lang/rust/issues/51415
5044 [49534]: https://github.com/rust-lang/rust/issues/49534
5045 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5046 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5048 Version 1.27.0 (2018-06-21)
5049 ==========================
5053 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5054 be used as an identifier.
5055 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5056 bare `Trait` syntax, and should make it clearer when being used in tandem with
5057 `impl Trait` because it is equivalent to the following syntax:
5058 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5059 `Box<Trait> == Box<dyn Trait>`.
5060 - [Attributes on generic parameters such as types and lifetimes are
5061 now stable.][48851] e.g.
5062 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5063 - [The `#[must_use]` attribute can now also be used on functions as well as
5064 types.][48925] It provides a lint that by default warns users when the
5065 value returned by a function has not been used.
5069 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5073 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5074 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5075 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5076 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5077 the `cfg` attribute.
5078 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5079 std are now available in core.][49896]
5080 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5082 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5083 that the operation isn't done in place.
5084 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5085 the `#[must_use]` attribute][49533] to warn about unused potentially
5086 expensive allocations.
5090 - [`DoubleEndedIterator::rfind`]
5091 - [`DoubleEndedIterator::rfold`]
5092 - [`DoubleEndedIterator::try_rfold`]
5093 - [`Duration::from_micros`]
5094 - [`Duration::from_nanos`]
5095 - [`Duration::subsec_micros`]
5096 - [`Duration::subsec_millis`]
5097 - [`HashMap::remove_entry`]
5098 - [`Iterator::try_fold`]
5099 - [`Iterator::try_for_each`]
5101 - [`Option::filter`]
5102 - [`String::replace_range`]
5103 - [`Take::set_limit`]
5104 - [`hint::unreachable_unchecked`]
5105 - [`os::unix::process::parent_id`]
5106 - [`ptr::swap_nonoverlapping`]
5107 - [`slice::rsplit_mut`]
5109 - [`slice::swap_with_slice`]
5113 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5114 `readme`, and `repository` fields.][cargo/5386]
5115 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5116 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5117 a different directory than `target` for placing compilation artifacts.
5118 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5119 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5120 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5121 where cargo would infer a binary, Cargo will produce a warning. You can
5122 disable this feature ahead of time by setting any of the following to false:
5123 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5124 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5125 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5129 - [Added “The Rustc book” into the official documentation.][49707]
5130 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5131 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5135 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5136 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5137 compile, `"".is_empty()` will still compile.
5138 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5139 will only print the inner type.][48553] E.g.
5140 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5141 not `AtomicBool(true)`.
5142 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5143 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5144 alignment should cover all use cases.
5145 - The `.description()` method on the `std::error::Error` trait
5146 [has been soft-deprecated][50163]. It is no longer required to implement it.
5148 [48553]: https://github.com/rust-lang/rust/pull/48553/
5149 [48851]: https://github.com/rust-lang/rust/pull/48851/
5150 [48925]: https://github.com/rust-lang/rust/pull/48925/
5151 [49533]: https://github.com/rust-lang/rust/pull/49533/
5152 [49623]: https://github.com/rust-lang/rust/pull/49623/
5153 [49630]: https://github.com/rust-lang/rust/pull/49630/
5154 [49664]: https://github.com/rust-lang/rust/pull/49664/
5155 [49699]: https://github.com/rust-lang/rust/pull/49699/
5156 [49707]: https://github.com/rust-lang/rust/pull/49707/
5157 [49896]: https://github.com/rust-lang/rust/pull/49896/
5158 [49968]: https://github.com/rust-lang/rust/pull/49968/
5159 [50163]: https://github.com/rust-lang/rust/pull/50163
5160 [50177]: https://github.com/rust-lang/rust/pull/50177/
5161 [50378]: https://github.com/rust-lang/rust/pull/50378/
5162 [50423]: https://github.com/rust-lang/rust/pull/50423/
5163 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5164 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5165 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5166 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5167 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5168 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5169 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5170 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5171 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5172 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5173 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5174 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5175 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5176 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5177 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5178 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5179 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5180 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5181 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5182 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5183 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5184 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5185 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5186 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5187 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5188 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5189 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5190 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5191 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5194 Version 1.26.2 (2018-06-05)
5195 ==========================
5200 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5202 [51117]: https://github.com/rust-lang/rust/issues/51117
5205 Version 1.26.1 (2018-05-29)
5206 ==========================
5211 - [RLS now works on Windows.][50646]
5212 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5218 - [`fn main() -> impl Trait` no longer works for non-Termination
5220 This reverts an accidental stabilization.
5221 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5222 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5224 [50646]: https://github.com/rust-lang/rust/issues/50646
5225 [50656]: https://github.com/rust-lang/rust/pull/50656
5226 [50812]: https://github.com/rust-lang/rust/pull/50812
5227 [50950]: https://github.com/rust-lang/rust/issues/50950
5228 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5230 Version 1.26.0 (2018-05-10)
5231 ==========================
5235 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5236 implement either or both traits.][49299]
5237 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5238 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5239 lifetime can be elided.][49458]
5240 - [`impl Trait` is now stable allowing you to have abstract types in returns
5241 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5242 `fn open(path: impl AsRef<Path>)`.
5243 - [Pattern matching will now automatically apply dereferences.][49394]
5244 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5245 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5246 - [A lot of operations are now available in a const context.][46882] E.g. You
5247 can now index into constant arrays, reference and dereference into constants,
5248 and use tuple struct constructors.
5249 - [Fixed entry slice patterns are now stable.][48516] E.g.
5251 let points = [1, 2, 3, 4];
5253 [1, 2, 3, 4] => println!("All points were sequential."),
5254 _ => println!("Not all points were sequential."),
5261 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5262 - [Fixed exponential projection complexity on nested types.][48296]
5263 This can provide up to a ~12% reduction in compile times for certain crates.
5264 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5265 to remap path prefixes outputted by the compiler.
5266 - [Added `powerpc-unknown-netbsd` target.][48281]
5270 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5271 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5272 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5273 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5274 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5275 - [`ascii::escape_default` is now available in libcore.][48735]
5276 - [Trailing commas are now supported in std and core macros.][48056]
5277 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5278 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5283 - [`*const T::copy_to_nonoverlapping`]
5284 - [`*const T::copy_to`]
5285 - [`*const T::read_unaligned`]
5286 - [`*const T::read_volatile`]
5287 - [`*const T::read`]
5289 - [`*const T::wrapping_add`]
5290 - [`*const T::wrapping_sub`]
5292 - [`*mut T::copy_to_nonoverlapping`]
5293 - [`*mut T::copy_to`]
5294 - [`*mut T::read_unaligned`]
5295 - [`*mut T::read_volatile`]
5297 - [`*mut T::replace`]
5300 - [`*mut T::wrapping_add`]
5301 - [`*mut T::wrapping_sub`]
5302 - [`*mut T::write_bytes`]
5303 - [`*mut T::write_unaligned`]
5304 - [`*mut T::write_volatile`]
5307 - [`FromUtf8Error::as_bytes`]
5308 - [`LocalKey::try_with`]
5309 - [`Option::cloned`]
5310 - [`btree_map::Entry::and_modify`]
5311 - [`fs::read_to_string`]
5314 - [`hash_map::Entry::and_modify`]
5315 - [`iter::FusedIterator`]
5316 - [`ops::RangeInclusive`]
5317 - [`ops::RangeToInclusive`]
5319 - [`slice::rotate_left`]
5320 - [`slice::rotate_right`]
5321 - [`String::retain`]
5326 - [Cargo will now output path to custom commands when `-v` is
5327 passed with `--list`][cargo/5041]
5328 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5332 - [The second edition of "The Rust Programming Language" book is now recommended
5333 over the first.][48404]
5338 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5339 syntax is now invalid.
5341 use std::ops::Fn as dyn;
5342 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5344 - [The result of dereferences are no longer promoted to `'static`.][47408]
5348 const PAIR: &(i32, i32) = &(0, 1);
5349 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5352 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5353 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5355 - [Removed hoedown from rustdoc.][48274]
5356 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5358 [46882]: https://github.com/rust-lang/rust/pull/46882
5359 [47379]: https://github.com/rust-lang/rust/pull/47379
5360 [47408]: https://github.com/rust-lang/rust/pull/47408
5361 [47813]: https://github.com/rust-lang/rust/pull/47813
5362 [48056]: https://github.com/rust-lang/rust/pull/48056
5363 [48125]: https://github.com/rust-lang/rust/pull/48125
5364 [48235]: https://github.com/rust-lang/rust/pull/48235
5365 [48274]: https://github.com/rust-lang/rust/pull/48274
5366 [48281]: https://github.com/rust-lang/rust/pull/48281
5367 [48296]: https://github.com/rust-lang/rust/pull/48296
5368 [48326]: https://github.com/rust-lang/rust/pull/48326
5369 [48359]: https://github.com/rust-lang/rust/pull/48359
5370 [48404]: https://github.com/rust-lang/rust/pull/48404
5371 [48481]: https://github.com/rust-lang/rust/pull/48481
5372 [48516]: https://github.com/rust-lang/rust/pull/48516
5373 [48628]: https://github.com/rust-lang/rust/pull/48628
5374 [48629]: https://github.com/rust-lang/rust/pull/48629
5375 [48657]: https://github.com/rust-lang/rust/pull/48657
5376 [48735]: https://github.com/rust-lang/rust/pull/48735
5377 [48978]: https://github.com/rust-lang/rust/pull/48978
5378 [49101]: https://github.com/rust-lang/rust/pull/49101
5379 [49109]: https://github.com/rust-lang/rust/pull/49109
5380 [49162]: https://github.com/rust-lang/rust/pull/49162
5381 [49255]: https://github.com/rust-lang/rust/pull/49255
5382 [49299]: https://github.com/rust-lang/rust/pull/49299
5383 [49305]: https://github.com/rust-lang/rust/pull/49305
5384 [49394]: https://github.com/rust-lang/rust/pull/49394
5385 [49458]: https://github.com/rust-lang/rust/pull/49458
5386 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5387 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5388 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5389 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5390 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5391 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5392 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5393 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5394 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5395 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5396 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5397 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5398 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5399 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5400 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5401 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5402 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5403 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5404 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5405 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5406 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5407 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5408 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5409 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5410 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5411 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5412 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5413 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5414 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5415 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5416 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5417 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5418 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5419 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5420 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5421 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5422 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5423 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5424 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5425 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5426 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5427 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5430 Version 1.25.0 (2018-03-29)
5431 ==========================
5435 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5436 - [You can now use nested groups of imports.][47948]
5437 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5438 - [You can now have `|` at the start of a match arm.][47947] e.g.
5440 enum Foo { A, B, C }
5446 | Foo::B => println!("AB"),
5447 | Foo::C => println!("C"),
5454 - [Upgraded to LLVM 6.][47828]
5455 - [Added `-C lto=val` option.][47521]
5456 - [Added `i586-unknown-linux-musl` target][47282]
5460 - [Impl Send for `process::Command` on Unix.][47760]
5461 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5462 - [`UnsafeCell::into_inner` is now safe.][47204]
5463 - [Implement libstd for CloudABI.][47268]
5464 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5465 - [Implement `AsRef<Path>` for Component][46985]
5466 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5467 - [Moved `Duration` to libcore.][46666]
5471 - [`Location::column`]
5474 The following functions can now be used in a constant expression.
5475 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5476 - [`Duration::new`][47300]
5477 - [`Duration::from_secs`][47300]
5478 - [`Duration::from_millis`][47300]
5482 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5483 - [`cargo new` now defaults to creating a binary crate, instead of a
5484 library crate.][cargo/5029]
5488 - [Rust by example is now shipped with new releases][46196]
5492 - [Deprecated `net::lookup_host`.][47510]
5493 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5494 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5495 around indexing operations (see [#47349][47349]). This has been fixed (which also
5496 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5497 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5499 [33903]: https://github.com/rust-lang/rust/pull/33903
5500 [47947]: https://github.com/rust-lang/rust/pull/47947
5501 [47948]: https://github.com/rust-lang/rust/pull/47948
5502 [47760]: https://github.com/rust-lang/rust/pull/47760
5503 [47790]: https://github.com/rust-lang/rust/pull/47790
5504 [47828]: https://github.com/rust-lang/rust/pull/47828
5505 [47398]: https://github.com/rust-lang/rust/pull/47398
5506 [47510]: https://github.com/rust-lang/rust/pull/47510
5507 [47521]: https://github.com/rust-lang/rust/pull/47521
5508 [47204]: https://github.com/rust-lang/rust/pull/47204
5509 [47251]: https://github.com/rust-lang/rust/pull/47251
5510 [47268]: https://github.com/rust-lang/rust/pull/47268
5511 [47282]: https://github.com/rust-lang/rust/pull/47282
5512 [47300]: https://github.com/rust-lang/rust/pull/47300
5513 [47349]: https://github.com/rust-lang/rust/pull/47349
5514 [46931]: https://github.com/rust-lang/rust/pull/46931
5515 [46985]: https://github.com/rust-lang/rust/pull/46985
5516 [47006]: https://github.com/rust-lang/rust/pull/47006
5517 [46830]: https://github.com/rust-lang/rust/pull/46830
5518 [46095]: https://github.com/rust-lang/rust/pull/46095
5519 [46666]: https://github.com/rust-lang/rust/pull/46666
5520 [46196]: https://github.com/rust-lang/rust/pull/46196
5521 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5522 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5523 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5524 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5525 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5528 Version 1.24.1 (2018-03-01)
5529 ==========================
5531 - [Do not abort when unwinding through FFI][48251]
5532 - [Emit UTF-16 files for linker arguments on Windows][48318]
5533 - [Make the error index generator work again][48308]
5534 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5536 [48251]: https://github.com/rust-lang/rust/issues/48251
5537 [48308]: https://github.com/rust-lang/rust/issues/48308
5538 [48318]: https://github.com/rust-lang/rust/issues/48318
5539 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5542 Version 1.24.0 (2018-02-15)
5543 ==========================
5547 - [External `sysv64` ffi is now available.][46528]
5548 eg. `extern "sysv64" fn foo () {}`
5552 - [rustc now uses 16 codegen units by default for release builds.][46910]
5553 For the fastest builds, utilize `codegen-units=1`.
5554 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5555 - [Add `aarch64-unknown-openbsd` support][46760]
5559 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5560 improvement in performance in the majority of cases.
5561 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5562 with Windows.][46798]
5563 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5564 - [impl `From<bool>` for `AtomicBool`][46293]
5565 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5566 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5567 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5568 - [float::from_bits now just uses transmute.][46012] This provides
5569 some optimisations from LLVM.
5570 - [Copied `AsciiExt` methods onto `char`][46077]
5571 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5572 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5573 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5574 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5578 - [`RefCell::replace`]
5580 - [`atomic::spin_loop_hint`]
5582 The following functions can now be used in a constant expression.
5583 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5585 - [`AtomicBool::new`][46287]
5586 - [`AtomicUsize::new`][46287]
5587 - [`AtomicIsize::new`][46287]
5588 - [`AtomicPtr::new`][46287]
5589 - [`Cell::new`][46287]
5590 - [`{integer}::min_value`][46287]
5591 - [`{integer}::max_value`][46287]
5592 - [`mem::size_of`][46287]
5593 - [`mem::align_of`][46287]
5594 - [`ptr::null`][46287]
5595 - [`ptr::null_mut`][46287]
5596 - [`RefCell::new`][46287]
5597 - [`UnsafeCell::new`][46287]
5601 - [Added a `workspace.default-members` config that
5602 overrides implied `--all` in virtual workspaces.][cargo/4743]
5603 - [Enable incremental by default on development builds.][cargo/4817] Also added
5604 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5605 per-project or global basis respectively.
5612 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5613 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5614 in accordance with IETF RFC 4291 §2.2.
5615 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5616 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5617 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5618 - [Leading zeros in tuple struct members is now an error][47084]
5619 - [`column!()` macro is one-based instead of zero-based][46977]
5620 - [`fmt::Arguments` can no longer be shared across threads][45198]
5621 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5622 - [Cargo sets a different working directory for the compiler][cargo/4788]
5624 [44884]: https://github.com/rust-lang/rust/pull/44884
5625 [45198]: https://github.com/rust-lang/rust/pull/45198
5626 [45506]: https://github.com/rust-lang/rust/pull/45506
5627 [45990]: https://github.com/rust-lang/rust/pull/45990
5628 [46012]: https://github.com/rust-lang/rust/pull/46012
5629 [46077]: https://github.com/rust-lang/rust/pull/46077
5630 [46094]: https://github.com/rust-lang/rust/pull/46094
5631 [46284]: https://github.com/rust-lang/rust/pull/46284
5632 [46287]: https://github.com/rust-lang/rust/pull/46287
5633 [46293]: https://github.com/rust-lang/rust/pull/46293
5634 [46528]: https://github.com/rust-lang/rust/pull/46528
5635 [46671]: https://github.com/rust-lang/rust/pull/46671
5636 [46713]: https://github.com/rust-lang/rust/pull/46713
5637 [46735]: https://github.com/rust-lang/rust/pull/46735
5638 [46760]: https://github.com/rust-lang/rust/pull/46760
5639 [46798]: https://github.com/rust-lang/rust/pull/46798
5640 [46828]: https://github.com/rust-lang/rust/pull/46828
5641 [46831]: https://github.com/rust-lang/rust/pull/46831
5642 [46833]: https://github.com/rust-lang/rust/pull/46833
5643 [46910]: https://github.com/rust-lang/rust/pull/46910
5644 [46977]: https://github.com/rust-lang/rust/pull/46977
5645 [47018]: https://github.com/rust-lang/rust/pull/47018
5646 [47080]: https://github.com/rust-lang/rust/pull/47080
5647 [47084]: https://github.com/rust-lang/rust/pull/47084
5648 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5649 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5650 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5651 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5652 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5653 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5656 Version 1.23.0 (2018-01-04)
5657 ==========================
5661 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5662 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5663 Which should fix some confusing errors in some operations.
5667 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5668 undefined behavior.][45920]
5669 - [rustc now suggests renaming import if names clash.][45660]
5670 - [Display errors/warnings correctly when there are zero-width or
5671 wide characters.][45711]
5672 - [rustc now avoids unnecessary copies of arguments that are
5673 simple bindings][45380] This should improve memory usage on average by 5-10%.
5674 - [Updated musl used to build musl rustc to 1.1.17][45393]
5678 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5679 - [Implement Hash for raw pointers to unsized types][45483]
5680 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5681 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5682 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5683 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5684 and `<*mut T>::as_mut`][44932]
5685 - [Optimized `Thread::{park, unpark}` implementation][45524]
5686 - [Improved `SliceExt::binary_search` performance.][45333]
5687 - [impl `FromIterator<()>` for `()`][45379]
5688 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5696 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5697 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5698 - [Added unit test checking to `cargo check`][cargo/4592]
5699 - [Cargo now lets you install a specific version
5700 using `cargo install --version`][cargo/4637]
5704 - [Releases now ship with the Cargo book documentation.][45692]
5705 - [rustdoc now prints rendering warnings on every run.][45324]
5709 - [Changes have been made to type equality to make it more correct,
5710 in rare cases this could break some code.][45853] [Tracking issue for
5711 further information][45852]
5712 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5713 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5714 Android 9, the minimum supported version is Android 14.
5715 - [Bumped the minimum LLVM to 3.9][45326]
5717 [44042]: https://github.com/rust-lang/rust/pull/44042
5718 [44932]: https://github.com/rust-lang/rust/pull/44932
5719 [45267]: https://github.com/rust-lang/rust/pull/45267
5720 [45324]: https://github.com/rust-lang/rust/pull/45324
5721 [45326]: https://github.com/rust-lang/rust/pull/45326
5722 [45333]: https://github.com/rust-lang/rust/pull/45333
5723 [45379]: https://github.com/rust-lang/rust/pull/45379
5724 [45380]: https://github.com/rust-lang/rust/pull/45380
5725 [45393]: https://github.com/rust-lang/rust/pull/45393
5726 [45435]: https://github.com/rust-lang/rust/pull/45435
5727 [45483]: https://github.com/rust-lang/rust/pull/45483
5728 [45524]: https://github.com/rust-lang/rust/pull/45524
5729 [45571]: https://github.com/rust-lang/rust/pull/45571
5730 [45580]: https://github.com/rust-lang/rust/pull/45580
5731 [45610]: https://github.com/rust-lang/rust/pull/45610
5732 [45660]: https://github.com/rust-lang/rust/pull/45660
5733 [45692]: https://github.com/rust-lang/rust/pull/45692
5734 [45711]: https://github.com/rust-lang/rust/pull/45711
5735 [45772]: https://github.com/rust-lang/rust/pull/45772
5736 [45852]: https://github.com/rust-lang/rust/issues/45852
5737 [45853]: https://github.com/rust-lang/rust/pull/45853
5738 [45887]: https://github.com/rust-lang/rust/pull/45887
5739 [45920]: https://github.com/rust-lang/rust/pull/45920
5740 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5741 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5742 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5745 Version 1.22.1 (2017-11-22)
5746 ==========================
5748 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5750 [46183]: https://github.com/rust-lang/rust/pull/46183
5752 Version 1.22.0 (2017-11-22)
5753 ==========================
5757 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5758 - [Now accepts underscores in unicode escapes][43716]
5759 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5760 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5764 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5765 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5766 This should decrease compile times for debug builds.
5767 - [strict memory alignment now enabled on ARMv6][45094]
5768 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5772 - [Allow atomic operations up to 32 bits
5773 on `armv5te_unknown_linux_gnueabi`][44978]
5774 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5775 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5776 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5777 - [Properly detect overflow in `Instant += Duration`.][44220]
5778 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5779 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5780 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5787 - [Cargo will now build multi file examples in subdirectories of the `examples`
5788 folder that have a `main.rs` file.][cargo/4496]
5789 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5790 the old format will continue to work and can be updated with `cargo update`.
5791 - [Now supports vendoring git repositories][cargo/3992]
5795 - [`libbacktrace` is now available on Apple platforms.][44251]
5796 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5797 This now lets you specify that a given code example will fail to compile.
5801 - [The minimum Android version that rustc can build for has been bumped
5802 to `4.0` from `2.3`][45656]
5803 - [Allowing `T op= &T` for numeric types has broken some type
5804 inference cases][45480]
5807 [42526]: https://github.com/rust-lang/rust/pull/42526
5808 [43716]: https://github.com/rust-lang/rust/pull/43716
5809 [43949]: https://github.com/rust-lang/rust/pull/43949
5810 [44015]: https://github.com/rust-lang/rust/pull/44015
5811 [44220]: https://github.com/rust-lang/rust/pull/44220
5812 [44251]: https://github.com/rust-lang/rust/pull/44251
5813 [44287]: https://github.com/rust-lang/rust/pull/44287
5814 [44303]: https://github.com/rust-lang/rust/pull/44303
5815 [44456]: https://github.com/rust-lang/rust/pull/44456
5816 [44466]: https://github.com/rust-lang/rust/pull/44466
5817 [44895]: https://github.com/rust-lang/rust/pull/44895
5818 [44966]: https://github.com/rust-lang/rust/pull/44966
5819 [44978]: https://github.com/rust-lang/rust/pull/44978
5820 [45041]: https://github.com/rust-lang/rust/pull/45041
5821 [45064]: https://github.com/rust-lang/rust/pull/45064
5822 [45075]: https://github.com/rust-lang/rust/pull/45075
5823 [45094]: https://github.com/rust-lang/rust/pull/45094
5824 [45095]: https://github.com/rust-lang/rust/pull/45095
5825 [45480]: https://github.com/rust-lang/rust/issues/45480
5826 [45656]: https://github.com/rust-lang/rust/pull/45656
5827 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5828 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5829 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5836 Version 1.21.0 (2017-10-12)
5837 ==========================
5841 - [You can now use static references for literals.][43838]
5845 let x: &'static u32 = &0;
5848 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5851 my_macro!(Vec<i32>::new); // Always worked
5852 my_macro!(Vec::<i32>::new); // Now works
5857 - [Upgraded jemalloc to 4.5.0][43911]
5858 - [Enabled unwinding panics on Redox][43917]
5859 - [Now runs LLVM in parallel during translation phase.][43506]
5860 This should reduce peak memory usage.
5864 - [Generate builtin impls for `Clone` for all arrays and tuples that
5865 are `T: Clone`][43690]
5866 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5867 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5868 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5873 [`std::mem::discriminant`]
5877 - [You can now call `cargo install` with multiple package names][cargo/4216]
5878 - [Cargo commands inside a virtual workspace will now implicitly
5879 pass `--all`][cargo/4335]
5880 - [Added a `[patch]` section to `Cargo.toml` to handle
5881 prepublication dependencies][cargo/4123] [RFC 1969]
5882 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5883 like patterns][cargo/4270]
5884 - [Added the `--all-targets` option][cargo/4400]
5885 - [Using required dependencies as a feature is now deprecated and emits
5886 a warning][cargo/4364]
5891 - [Cargo docs are moving][43916]
5892 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5893 - [The rustdoc book is now available][43863]
5894 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5895 - [Added a preview of RLS has been made available through rustup][44204]
5896 Install with `rustup component add rls-preview`
5897 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5898 Previously only showed `std::os::unix`.
5902 - [Changes in method matching against higher-ranked types][43880] This may cause
5903 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5904 - [rustc's JSON error output's byte position start at top of file.][42973]
5905 Was previously relative to the rustc's internal `CodeMap` struct which
5906 required the unstable library `libsyntax` to correctly use.
5907 - [`unused_results` lint no longer ignores booleans][43728]
5909 [42565]: https://github.com/rust-lang/rust/pull/42565
5910 [42973]: https://github.com/rust-lang/rust/pull/42973
5911 [43348]: https://github.com/rust-lang/rust/pull/43348
5912 [43459]: https://github.com/rust-lang/rust/pull/43459
5913 [43506]: https://github.com/rust-lang/rust/pull/43506
5914 [43540]: https://github.com/rust-lang/rust/pull/43540
5915 [43690]: https://github.com/rust-lang/rust/pull/43690
5916 [43728]: https://github.com/rust-lang/rust/pull/43728
5917 [43838]: https://github.com/rust-lang/rust/pull/43838
5918 [43863]: https://github.com/rust-lang/rust/pull/43863
5919 [43880]: https://github.com/rust-lang/rust/pull/43880
5920 [43911]: https://github.com/rust-lang/rust/pull/43911
5921 [43916]: https://github.com/rust-lang/rust/pull/43916
5922 [43917]: https://github.com/rust-lang/rust/pull/43917
5923 [44204]: https://github.com/rust-lang/rust/pull/44204
5924 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5925 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5926 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5927 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5928 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5929 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5930 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5931 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5932 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5934 Version 1.20.0 (2017-08-31)
5935 ===========================
5939 - [Associated constants are now stabilised.][42809]
5940 - [A lot of macro bugs are now fixed.][42913]
5945 - [Struct fields are now properly coerced to the expected field type.][42807]
5946 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5947 `wasm32-experimental-emscripten` target.
5948 - [Changed some of the error messages to be more helpful.][42033]
5949 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5951 - [rustc now reports the total number of errors on compilation failure][43015]
5952 previously this was only the number of errors in the pass that failed.
5953 - [Expansion in rustc has been sped up 29x.][42533]
5954 - [added `msp430-none-elf` target.][43099]
5955 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5957 - [Fixes backtraces on Redox][43228]
5958 - [rustc now identifies different versions of same crate when absolute paths of
5959 different types match in an error message.][42826]
5965 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5966 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5968 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5969 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5970 - [Impl `Clone` for `DefaultHasher`.][42799]
5971 - [Impl `Sync` for `SyncSender`.][42397]
5972 - [Impl `FromStr` for `char`][42271]
5973 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5975 - [allow messages in the `unimplemented!()` macro.][42155]
5976 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5977 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5978 - [Upgrade to Unicode 10.0.0][42999]
5979 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5980 - [Skip the main thread's manual stack guard on Linux][43072]
5981 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5982 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5984 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5989 - [`CStr::into_c_string`]
5990 - [`CString::as_c_str`]
5991 - [`CString::into_boxed_c_str`]
5992 - [`Chain::get_mut`]
5993 - [`Chain::get_ref`]
5994 - [`Chain::into_inner`]
5995 - [`Option::get_or_insert_with`]
5996 - [`Option::get_or_insert`]
5997 - [`OsStr::into_os_string`]
5998 - [`OsString::into_boxed_os_str`]
6001 - [`Utf8Error::error_len`]
6002 - [`char::EscapeDebug`]
6003 - [`char::escape_debug`]
6004 - [`compile_error!`]
6005 - [`f32::from_bits`]
6007 - [`f64::from_bits`]
6009 - [`mem::ManuallyDrop`]
6010 - [`slice::sort_unstable_by_key`]
6011 - [`slice::sort_unstable_by`]
6012 - [`slice::sort_unstable`]
6013 - [`str::from_boxed_utf8_unchecked`]
6014 - [`str::as_bytes_mut`]
6015 - [`str::as_bytes_mut`]
6016 - [`str::from_utf8_mut`]
6017 - [`str::from_utf8_unchecked_mut`]
6019 - [`str::get_unchecked_mut`]
6020 - [`str::get_unchecked`]
6022 - [`str::into_boxed_bytes`]
6027 - [Cargo API token location moved from `~/.cargo/config` to
6028 `~/.cargo/credentials`.][cargo/3978]
6029 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6030 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6031 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6032 - [You can now specify version of a binary when installed through
6033 `cargo install` using `--vers`.][cargo/4229]
6034 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6035 failure.][cargo/4248]
6036 - [Changed the convention around which file is the crate root.][cargo/4259]
6041 - [Functions with `'static` in their return types will now not be as usable as
6042 if they were using lifetime parameters instead.][42417]
6043 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6044 takes the sign of NaN into account where previously didn't.][42430]
6046 [42033]: https://github.com/rust-lang/rust/pull/42033
6047 [42155]: https://github.com/rust-lang/rust/pull/42155
6048 [42271]: https://github.com/rust-lang/rust/pull/42271
6049 [42397]: https://github.com/rust-lang/rust/pull/42397
6050 [42417]: https://github.com/rust-lang/rust/pull/42417
6051 [42430]: https://github.com/rust-lang/rust/pull/42430
6052 [42431]: https://github.com/rust-lang/rust/pull/42431
6053 [42533]: https://github.com/rust-lang/rust/pull/42533
6054 [42571]: https://github.com/rust-lang/rust/pull/42571
6055 [42613]: https://github.com/rust-lang/rust/pull/42613
6056 [42799]: https://github.com/rust-lang/rust/pull/42799
6057 [42807]: https://github.com/rust-lang/rust/pull/42807
6058 [42809]: https://github.com/rust-lang/rust/pull/42809
6059 [42822]: https://github.com/rust-lang/rust/pull/42822
6060 [42826]: https://github.com/rust-lang/rust/pull/42826
6061 [42854]: https://github.com/rust-lang/rust/pull/42854
6062 [42913]: https://github.com/rust-lang/rust/pull/42913
6063 [42999]: https://github.com/rust-lang/rust/pull/42999
6064 [43011]: https://github.com/rust-lang/rust/pull/43011
6065 [43015]: https://github.com/rust-lang/rust/pull/43015
6066 [43072]: https://github.com/rust-lang/rust/pull/43072
6067 [43077]: https://github.com/rust-lang/rust/pull/43077
6068 [43097]: https://github.com/rust-lang/rust/pull/43097
6069 [43099]: https://github.com/rust-lang/rust/pull/43099
6070 [43170]: https://github.com/rust-lang/rust/pull/43170
6071 [43178]: https://github.com/rust-lang/rust/pull/43178
6072 [43185]: https://github.com/rust-lang/rust/pull/43185
6073 [43228]: https://github.com/rust-lang/rust/pull/43228
6074 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6075 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6076 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6077 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6078 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6079 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6080 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6081 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6082 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6083 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6084 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6085 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6086 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6087 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6088 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6089 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6090 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6091 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6092 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6093 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6094 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6095 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6096 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6097 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6098 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6099 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6100 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6101 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6102 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6103 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6104 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6105 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6106 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6107 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6108 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6109 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6110 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6111 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6114 Version 1.19.0 (2017-07-20)
6115 ===========================
6120 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6121 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6122 - [Macro recursion limit increased to 1024 from 64.][41676]
6123 - [Added lint for detecting unused macros.][41907]
6124 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6125 For example: `let x = loop { break 7; };`
6126 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6127 contain `Copy` types and cannot have a `Drop` implementation.
6128 Example: `union Foo { bar: u8, baz: usize }`
6129 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6130 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6135 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6136 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6137 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6138 you should use `--target armv7-linux-androideabi`.
6139 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6140 - [Minor optimisation of string operations.][42037]
6141 - [Compiler error message is now `aborting due to previous error(s)` instead of
6142 `aborting due to N previous errors`][42150] This was previously inaccurate and
6143 would only count certain kinds of errors.
6144 - [The compiler now supports Visual Studio 2017][42225]
6145 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6146 - [Added a lot][42264] of [new error codes][42302]
6147 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6148 libraries with C Run-time Libraries(CRT) to be statically linked.
6149 - [Fixed various ARM codegen bugs][42740]
6154 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6155 `Extend<Cow<'a, str>>`][41449]
6156 - [`Vec` now implements `From<&mut [T]>`][41530]
6157 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6158 - [`SplitWhitespace` now implements `Clone`][41659]
6159 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6161 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6162 macros, but for printing to stderr.
6167 - [`OsString::shrink_to_fit`]
6170 - [`thread::ThreadId`]
6175 - [Build scripts can now add environment variables to the environment
6176 the crate is being compiled in.
6177 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6178 - [Subcommands now replace the current process rather than spawning a new
6179 child process][cargo/3970]
6180 - [Workspace members can now accept glob file patterns][cargo/3979]
6181 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6182 the members in a given workspace.][cargo/3988]
6183 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6184 - [Target directory path is now in the cargo metadata][cargo/4022]
6185 - [Cargo no longer checks out a local working directory for the
6186 crates.io index][cargo/4026] This should provide smaller file size for the
6187 registry, and improve cloning times, especially on Windows machines.
6188 - [Added an `--exclude` option for excluding certain packages when using the
6189 `--all` option][cargo/4031]
6190 - [Cargo will now automatically retry when receiving a 5xx error
6191 from crates.io][cargo/4032]
6192 - [The `--features` option now accepts multiple comma or space
6193 delimited values.][cargo/4084]
6194 - [Added support for custom target specific runners][cargo/3954]
6199 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6201 - [Rust will now release XZ compressed packages][rust-installer/57]
6202 - [rustup will now prefer to download rust packages with
6203 XZ compression][rustup/1100] over GZip packages.
6204 - [Added the ability to escape `#` in rust documentation][41785] By adding
6205 additional `#`'s ie. `##` is now `#`
6210 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6211 - [`-Z` flags are now no longer allowed to be used on the stable
6212 compiler.][41751] This has been a warning for a year previous to this.
6213 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6214 longer works][42844]. Users should migrate to the built-in `check`
6215 command, which has been available since 1.16.
6216 - [Ending a float literal with `._` is now a hard error.
6217 Example: `42._` .][41946]
6218 - [Any use of a private `extern crate` outside of its module is now a
6219 hard error.][36886] This was previously a warning.
6220 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6221 relative while the `::` prefix makes a path absolute, but was ignored and the
6222 path was relative regardless.
6223 - [Floating point constants in match patterns is now a hard error][36890]
6224 This was previously a warning.
6225 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6226 match patterns is now a hard error][36891] This was previously a warning.
6227 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6229 - [From the pound escape, lines consisting of multiple `#`s are
6231 - [It is an error to re-export private enum variants][42460]. This is
6232 known to break a number of crates that depend on an older version of
6234 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6235 to use it to find the linker, and the build will fail where it did
6236 not previously][42607]
6238 [36886]: https://github.com/rust-lang/rust/issues/36886
6239 [36888]: https://github.com/rust-lang/rust/issues/36888
6240 [36890]: https://github.com/rust-lang/rust/issues/36890
6241 [36891]: https://github.com/rust-lang/rust/issues/36891
6242 [36892]: https://github.com/rust-lang/rust/issues/36892
6243 [37406]: https://github.com/rust-lang/rust/issues/37406
6244 [39983]: https://github.com/rust-lang/rust/pull/39983
6245 [41145]: https://github.com/rust-lang/rust/pull/41145
6246 [41192]: https://github.com/rust-lang/rust/pull/41192
6247 [41258]: https://github.com/rust-lang/rust/pull/41258
6248 [41370]: https://github.com/rust-lang/rust/pull/41370
6249 [41449]: https://github.com/rust-lang/rust/pull/41449
6250 [41530]: https://github.com/rust-lang/rust/pull/41530
6251 [41624]: https://github.com/rust-lang/rust/pull/41624
6252 [41656]: https://github.com/rust-lang/rust/pull/41656
6253 [41659]: https://github.com/rust-lang/rust/pull/41659
6254 [41676]: https://github.com/rust-lang/rust/pull/41676
6255 [41751]: https://github.com/rust-lang/rust/pull/41751
6256 [41764]: https://github.com/rust-lang/rust/pull/41764
6257 [41785]: https://github.com/rust-lang/rust/pull/41785
6258 [41873]: https://github.com/rust-lang/rust/pull/41873
6259 [41907]: https://github.com/rust-lang/rust/pull/41907
6260 [41946]: https://github.com/rust-lang/rust/pull/41946
6261 [42016]: https://github.com/rust-lang/rust/pull/42016
6262 [42037]: https://github.com/rust-lang/rust/pull/42037
6263 [42068]: https://github.com/rust-lang/rust/pull/42068
6264 [42150]: https://github.com/rust-lang/rust/pull/42150
6265 [42162]: https://github.com/rust-lang/rust/pull/42162
6266 [42225]: https://github.com/rust-lang/rust/pull/42225
6267 [42264]: https://github.com/rust-lang/rust/pull/42264
6268 [42302]: https://github.com/rust-lang/rust/pull/42302
6269 [42460]: https://github.com/rust-lang/rust/issues/42460
6270 [42607]: https://github.com/rust-lang/rust/issues/42607
6271 [42740]: https://github.com/rust-lang/rust/pull/42740
6272 [42844]: https://github.com/rust-lang/rust/issues/42844
6273 [42948]: https://github.com/rust-lang/rust/pull/42948
6274 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6275 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6276 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6277 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6278 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6279 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6280 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6281 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6282 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6283 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6284 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6285 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6286 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6287 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6288 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6289 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6290 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6291 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6292 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6293 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6294 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6295 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6298 Version 1.18.0 (2017-06-08)
6299 ===========================
6304 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6305 make the item visible to just that module tree. Also accepts the keyword
6306 `crate` to make something public to the whole crate but not users of the
6307 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6308 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6309 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6310 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6311 types like `Write + Send`, trailing `+` are now supported in trait objects,
6312 and better error reporting for trait objects starting with `?Sized`.
6313 - [0e+10 is now a valid floating point literal][40589]
6314 - [Now warns if you bind a lifetime parameter to 'static][40734]
6315 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6316 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6317 representation in some cases.][40377]
6322 - [rustc can now emit mir with `--emit mir`][39891]
6323 - [Improved LLVM IR for trivial functions][40367]
6324 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6325 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6326 opportunities found through profiling
6327 - [Improved backtrace formatting when panicking][38165]
6332 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6333 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6334 iteration or reallocation.
6335 - [Simplified HashMap Bucket interface][40561] provides performance
6336 improvements for iterating and cloning.
6337 - [Specialize Vec::from_elem to use calloc][40409]
6338 - [Fixed Race condition in fs::create_dir_all][39799]
6339 - [No longer caching stdio on Windows][40516]
6340 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6341 2.50%~ faster and in one case now 12.50% faster.
6342 - [Optimized `AtomicBool::fetch_nand`][41143]
6347 - [`Child::try_wait`]
6348 - [`HashMap::retain`]
6349 - [`HashSet::retain`]
6351 - [`TcpStream::peek`]
6352 - [`UdpSocket::peek`]
6353 - [`UdpSocket::peek_from`]
6358 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6359 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6360 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6361 - [Added Android build support][cargo/3885]
6362 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6363 of a certain type, for example `cargo build --bins` will build all
6365 - [Added support for haiku][cargo/3952]
6370 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6371 - [Rust now uses the official cross compiler for NetBSD][40612]
6372 - [rustdoc now accepts `#` at the start of files][40828]
6373 - [Fixed jemalloc support for musl][41168]
6378 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6379 always placed after the sign if it exists and before the digits. With the `#`
6380 flag the zeroes are placed after the prefix and before the digits.
6381 - [Due to the struct field optimisation][40377], using `transmute` on structs
6382 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6383 always been undefined behavior, but is now more likely to break in practice.
6384 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6385 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6386 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6387 - [Overlapping inherent `impl`s are now a hard error][40728]
6388 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6389 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6390 `out.asm` and `out.ll` instead of only one of the filetypes.
6391 - [ calling a function that returns `Self` will no longer work][41805] when
6392 the size of `Self` cannot be statically determined.
6393 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6394 this has caused a few regressions namely:
6396 - Changed the link order of local static/dynamic libraries (respecting the
6397 order on given rather than having the compiler reorder).
6398 - Changed how MinGW is linked, native code linked to dynamic libraries
6399 may require manually linking to the gcc support library (for the native
6402 [38165]: https://github.com/rust-lang/rust/pull/38165
6403 [39799]: https://github.com/rust-lang/rust/pull/39799
6404 [39891]: https://github.com/rust-lang/rust/pull/39891
6405 [40043]: https://github.com/rust-lang/rust/pull/40043
6406 [40241]: https://github.com/rust-lang/rust/pull/40241
6407 [40338]: https://github.com/rust-lang/rust/pull/40338
6408 [40367]: https://github.com/rust-lang/rust/pull/40367
6409 [40377]: https://github.com/rust-lang/rust/pull/40377
6410 [40409]: https://github.com/rust-lang/rust/pull/40409
6411 [40516]: https://github.com/rust-lang/rust/pull/40516
6412 [40556]: https://github.com/rust-lang/rust/pull/40556
6413 [40561]: https://github.com/rust-lang/rust/pull/40561
6414 [40589]: https://github.com/rust-lang/rust/pull/40589
6415 [40612]: https://github.com/rust-lang/rust/pull/40612
6416 [40723]: https://github.com/rust-lang/rust/pull/40723
6417 [40728]: https://github.com/rust-lang/rust/pull/40728
6418 [40731]: https://github.com/rust-lang/rust/pull/40731
6419 [40734]: https://github.com/rust-lang/rust/pull/40734
6420 [40805]: https://github.com/rust-lang/rust/pull/40805
6421 [40807]: https://github.com/rust-lang/rust/pull/40807
6422 [40828]: https://github.com/rust-lang/rust/pull/40828
6423 [40870]: https://github.com/rust-lang/rust/pull/40870
6424 [41085]: https://github.com/rust-lang/rust/pull/41085
6425 [41143]: https://github.com/rust-lang/rust/pull/41143
6426 [41168]: https://github.com/rust-lang/rust/pull/41168
6427 [41270]: https://github.com/rust-lang/rust/issues/41270
6428 [41469]: https://github.com/rust-lang/rust/pull/41469
6429 [41805]: https://github.com/rust-lang/rust/issues/41805
6430 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6431 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6432 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6433 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6434 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6435 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6436 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6437 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6438 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6439 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6440 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6441 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6442 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6443 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6446 Version 1.17.0 (2017-04-27)
6447 ===========================
6452 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6453 * [Fields of structs may be initialized without duplicating the field/variable
6454 names][39761]. [RFC 1682]
6455 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6456 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6457 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6458 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6459 `'b`. Soundness fix.
6460 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6461 * [Static variables may contain references to other statics][40027]
6466 * [Exit quickly on only `--emit dep-info`][40336]
6467 * [Make `-C relocation-model` more correctly determine whether the linker
6468 creates a position-independent executable][40245]
6469 * [Add `-C overflow-checks` to directly control whether integer overflow
6471 * [The rustc type checker now checks items on demand instead of in a single
6472 in-order pass][40008]. This is mostly an internal refactoring in support of
6473 future work, including incremental type checking, but also resolves [RFC
6474 1647], allowing `Self` to appear in `impl` `where` clauses.
6475 * [Optimize vtable loads][39995]
6476 * [Turn off vectorization for Emscripten targets][39990]
6477 * [Provide suggestions for unknown macros imported with `use`][39953]
6478 * [Fix ICEs in path resolution][39939]
6479 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6480 * [Add clearer error message using `&str + &str`][39116]
6491 * [`Ordering::then`]
6492 * [`Ordering::then_with`]
6493 * [`BTreeMap::range`]
6494 * [`BTreeMap::range_mut`]
6495 * [`collections::Bound`]
6496 * [`process::abort`]
6497 * [`ptr::read_unaligned`]
6498 * [`ptr::write_unaligned`]
6499 * [`Result::expect_err`]
6502 * [`Cell::into_inner`]
6508 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6509 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6510 * [`String` implements `FromIterator<&char>`][40028]
6511 * `Box` [implements][40009] a number of new conversions:
6512 `From<Box<str>> for String`,
6513 `From<Box<[T]>> for Vec<T>`,
6514 `From<Box<CStr>> for CString`,
6515 `From<Box<OsStr>> for OsString`,
6516 `From<Box<Path>> for PathBuf`,
6517 `Into<Box<str>> for String`,
6518 `Into<Box<[T]>> for Vec<T>`,
6519 `Into<Box<CStr>> for CString`,
6520 `Into<Box<OsStr>> for OsString`,
6521 `Into<Box<Path>> for PathBuf`,
6522 `Default for Box<str>`,
6523 `Default for Box<CStr>`,
6524 `Default for Box<OsStr>`,
6525 `From<&CStr> for Box<CStr>`,
6526 `From<&OsStr> for Box<OsStr>`,
6527 `From<&Path> for Box<Path>`
6528 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6529 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6530 * [Slightly optimize `slice::sort`][39538]
6531 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6532 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6533 `Box<str>` implements `From<&str>`][39438]
6534 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6535 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6536 * [`format!` estimates the needed capacity before writing a string][39356]
6537 * [Support unprivileged symlink creation in Windows][38921]
6538 * [`PathBuf` implements `Default`][38764]
6539 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6540 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6541 and poor hash functions.
6546 * [Add `cargo check --all`][cargo/3731]
6547 * [Add an option to ignore SSL revocation checking][cargo/3699]
6548 * [Add `cargo run --package`][cargo/3691]
6549 * [Add `required_features`][cargo/3667]
6550 * [Assume `build.rs` is a build script][cargo/3664]
6551 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6556 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6558 * [The "Unstable Book" documents nightly-only features][ubook]
6559 * [Improve the style of the sidebar in rustdoc output][40265]
6560 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6561 * [Fix MSP430 breakage due to `i128`][40257]
6562 * [Preliminary Solaris/SPARCv9 support][39903]
6563 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6564 run without installing the MSVC runtime.
6565 * [`rustdoc --test` includes file names in test names][39788]
6566 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6567 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6568 * [Initial support for `aarch64-unknown-freebsd`][39491]
6569 * [Initial support for `i686-unknown-netbsd`][39426]
6570 * [This release no longer includes the old makefile build system][39431]. Rust
6571 is built with a custom build system, written in Rust, and with Cargo.
6572 * [Add Debug implementations for libcollection structs][39002]
6573 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6574 * [`--test-threads=0` produces an error][38945]
6575 * [`rustup` installs documentation by default][40526]
6576 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6577 WinDbg and Visual Studio to improve the debugging experience.
6582 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6583 workaround, either use MSVC 2015 or run vcvars.bat.
6584 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6585 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6586 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6588 * [`format!` and `Display::to_string` panic if an underlying formatting
6589 implementation returns an error][40117]. Previously the error was silently
6590 ignored. It is incorrect for `write_fmt` to return an error when writing
6592 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6593 crates were marked stable and could be accessed from the stable toolchain.
6594 * [Rust git source no longer includes vendored crates][39728]. Those that need
6595 to build with vendored crates should build from release tarballs.
6596 * [Fix inert attributes from `proc_macro_derives`][39572]
6597 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6598 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6600 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6601 existing code generally ignores the type of dead-code unless a type-hint is
6602 provided; this can cause surprising inference interactions particularly around
6603 defaulting. The new code uniformly ignores the result type of dead-code.
6604 * [Tuple-struct constructors with private fields are no longer visible][38932]
6605 * [Lifetime parameters that do not appear in the arguments are now considered
6606 early-bound][38897], resolving a soundness bug (#[32330]). The
6607 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6609 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6610 * [Make transmuting from fn item types to pointer-sized types a hard
6613 [27787]: https://github.com/rust-lang/rust/issues/27787
6614 [32330]: https://github.com/rust-lang/rust/issues/32330
6615 [34198]: https://github.com/rust-lang/rust/pull/34198
6616 [38161]: https://github.com/rust-lang/rust/pull/38161
6617 [38368]: https://github.com/rust-lang/rust/pull/38368
6618 [38584]: https://github.com/rust-lang/rust/issues/38584
6619 [38661]: https://github.com/rust-lang/rust/pull/38661
6620 [38764]: https://github.com/rust-lang/rust/pull/38764
6621 [38864]: https://github.com/rust-lang/rust/issues/38864
6622 [38897]: https://github.com/rust-lang/rust/pull/38897
6623 [38921]: https://github.com/rust-lang/rust/pull/38921
6624 [38932]: https://github.com/rust-lang/rust/pull/38932
6625 [38945]: https://github.com/rust-lang/rust/pull/38945
6626 [38981]: https://github.com/rust-lang/rust/pull/38981
6627 [39002]: https://github.com/rust-lang/rust/pull/39002
6628 [39116]: https://github.com/rust-lang/rust/pull/39116
6629 [39193]: https://github.com/rust-lang/rust/pull/39193
6630 [39265]: https://github.com/rust-lang/rust/pull/39265
6631 [39356]: https://github.com/rust-lang/rust/pull/39356
6632 [39372]: https://github.com/rust-lang/rust/pull/39372
6633 [39426]: https://github.com/rust-lang/rust/pull/39426
6634 [39431]: https://github.com/rust-lang/rust/pull/39431
6635 [39438]: https://github.com/rust-lang/rust/pull/39438
6636 [39440]: https://github.com/rust-lang/rust/pull/39440
6637 [39485]: https://github.com/rust-lang/rust/pull/39485
6638 [39491]: https://github.com/rust-lang/rust/pull/39491
6639 [39518]: https://github.com/rust-lang/rust/pull/39518
6640 [39538]: https://github.com/rust-lang/rust/pull/39538
6641 [39572]: https://github.com/rust-lang/rust/pull/39572
6642 [39633]: https://github.com/rust-lang/rust/pull/39633
6643 [39642]: https://github.com/rust-lang/rust/pull/39642
6644 [39728]: https://github.com/rust-lang/rust/pull/39728
6645 [39761]: https://github.com/rust-lang/rust/pull/39761
6646 [39788]: https://github.com/rust-lang/rust/pull/39788
6647 [39793]: https://github.com/rust-lang/rust/pull/39793
6648 [39837]: https://github.com/rust-lang/rust/pull/39837
6649 [39843]: https://github.com/rust-lang/rust/pull/39843
6650 [39851]: https://github.com/rust-lang/rust/pull/39851
6651 [39903]: https://github.com/rust-lang/rust/pull/39903
6652 [39939]: https://github.com/rust-lang/rust/pull/39939
6653 [39953]: https://github.com/rust-lang/rust/pull/39953
6654 [39960]: https://github.com/rust-lang/rust/pull/39960
6655 [39990]: https://github.com/rust-lang/rust/pull/39990
6656 [39995]: https://github.com/rust-lang/rust/pull/39995
6657 [40008]: https://github.com/rust-lang/rust/pull/40008
6658 [40009]: https://github.com/rust-lang/rust/pull/40009
6659 [40027]: https://github.com/rust-lang/rust/pull/40027
6660 [40028]: https://github.com/rust-lang/rust/pull/40028
6661 [40037]: https://github.com/rust-lang/rust/pull/40037
6662 [40117]: https://github.com/rust-lang/rust/pull/40117
6663 [40166]: https://github.com/rust-lang/rust/pull/40166
6664 [40245]: https://github.com/rust-lang/rust/pull/40245
6665 [40257]: https://github.com/rust-lang/rust/pull/40257
6666 [40261]: https://github.com/rust-lang/rust/pull/40261
6667 [40265]: https://github.com/rust-lang/rust/pull/40265
6668 [40319]: https://github.com/rust-lang/rust/pull/40319
6669 [40336]: https://github.com/rust-lang/rust/pull/40336
6670 [40526]: https://github.com/rust-lang/rust/pull/40526
6671 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6672 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6673 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6674 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6675 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6676 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6677 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6678 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6679 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6680 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6681 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6682 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6683 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6684 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6685 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6686 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6687 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6688 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6689 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6690 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6691 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6692 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6693 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6694 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6695 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6696 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6697 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6698 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6699 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6700 [ubook]: https://doc.rust-lang.org/unstable-book/
6703 Version 1.16.0 (2017-03-16)
6704 ===========================
6709 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6710 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6711 match patterns][38069]
6712 * [Clean up semantics of `self` in an import list][38313]
6713 * [`Self` may appear in `impl` headers][38920]
6714 * [`Self` may appear in struct expressions][39282]
6719 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6720 a `.rmeta` file containing only crate metadata][38571]. This can be
6721 used by tools like the Rust Language Service to perform
6722 metadata-only builds.
6723 * [Levenshtein based typo suggestions now work in most places, while
6724 previously they worked only for fields and sometimes for local
6725 variables][38927]. Together with the overhaul of "no
6726 resolution"/"unexpected resolution" errors (#[38154]) they result in
6727 large and systematic improvement in resolution diagnostics.
6728 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6730 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6731 * [`rustc` no longer attempts to provide "consider using an explicit
6732 lifetime" suggestions][37057]. They were inaccurate.
6737 * [`VecDeque::truncate`]
6738 * [`VecDeque::resize`]
6739 * [`String::insert_str`]
6740 * [`Duration::checked_add`]
6741 * [`Duration::checked_sub`]
6742 * [`Duration::checked_div`]
6743 * [`Duration::checked_mul`]
6746 * [`SocketAddr::is_ipv4`]
6747 * [`SocketAddr::is_ipv6`]
6748 * [`IpAddr::is_ipv4`]
6749 * [`IpAddr::is_ipv6`]
6751 * [`Vec::dedup_by_key`]
6752 * [`Result::unwrap_or_default`]
6753 * [`<*const T>::wrapping_offset`]
6754 * [`<*mut T>::wrapping_offset`]
6755 * `CommandExt::creation_flags`
6756 * [`File::set_permissions`]
6757 * [`String::split_off`]
6762 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6763 their argument by `Borrow` parameter][37761]
6764 * [All public types in std implement `Debug`][38006]
6765 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6766 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6767 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6769 * [std: Fix partial writes in `LineWriter`][38062]
6770 * [std: Clamp max read/write sizes on Unix][38622]
6771 * [Use more specific panic message for `&str` slicing errors][38066]
6772 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6773 functionality cannot be achieved in std currently.
6774 * [`writeln!`, like `println!`, now accepts a form with no string
6775 or formatting arguments, to just print a newline][38469]
6776 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6777 * [Reduce the size of static data in `std_unicode::tables`][38781]
6778 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6779 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6781 * [`Duration` implements `Sum`][38712]
6782 * [`String` implements `ToSocketAddrs`][39048]
6787 * [The `cargo check` command does a type check of a project without
6788 building it][cargo/3296]
6789 * [crates.io will display CI badges from Travis and AppVeyor, if
6790 specified in Cargo.toml][cargo/3546]
6791 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6792 * [Compilation profiles accept integer values for `debug`, in addition
6793 to `true` and `false`. These are passed to `rustc` as the value to
6794 `-C debuginfo`][cargo/3534]
6795 * [Implement `cargo --version --verbose`][cargo/3604]
6796 * [All builds now output 'dep-info' build dependencies compatible with
6797 make and ninja][cargo/3557]
6798 * [Build all workspace members with `build --all`][cargo/3511]
6799 * [Document all workspace members with `doc --all`][cargo/3515]
6800 * [Path deps outside workspace are not members][cargo/3443]
6805 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6806 the path to the Rust implementation][38589]
6807 * [The `armv7-linux-androideabi` target no longer enables NEON
6808 extensions, per Google's ABI guide][38413]
6809 * [The stock standard library can be compiled for Redox OS][38401]
6810 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6812 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6814 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6819 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6820 match patterns][38069]
6821 * In this release, references to uninhabited types can not be
6822 pattern-matched. This was accidentally allowed in 1.15.
6823 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6824 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6826 * [Clean up semantics of `self` in an import list][38313]
6827 * Reimplemented lifetime elision. This change was almost entirely compatible
6828 with existing code, but it did close a number of small bugs and loopholes,
6829 as well as being more accepting in some other [cases][41105].
6831 [37057]: https://github.com/rust-lang/rust/pull/37057
6832 [37761]: https://github.com/rust-lang/rust/pull/37761
6833 [38006]: https://github.com/rust-lang/rust/pull/38006
6834 [38051]: https://github.com/rust-lang/rust/pull/38051
6835 [38062]: https://github.com/rust-lang/rust/pull/38062
6836 [38622]: https://github.com/rust-lang/rust/pull/38622
6837 [38066]: https://github.com/rust-lang/rust/pull/38066
6838 [38069]: https://github.com/rust-lang/rust/pull/38069
6839 [38131]: https://github.com/rust-lang/rust/pull/38131
6840 [38154]: https://github.com/rust-lang/rust/pull/38154
6841 [38274]: https://github.com/rust-lang/rust/pull/38274
6842 [38304]: https://github.com/rust-lang/rust/pull/38304
6843 [38313]: https://github.com/rust-lang/rust/pull/38313
6844 [38327]: https://github.com/rust-lang/rust/pull/38327
6845 [38401]: https://github.com/rust-lang/rust/pull/38401
6846 [38413]: https://github.com/rust-lang/rust/pull/38413
6847 [38469]: https://github.com/rust-lang/rust/pull/38469
6848 [38559]: https://github.com/rust-lang/rust/pull/38559
6849 [38571]: https://github.com/rust-lang/rust/pull/38571
6850 [38580]: https://github.com/rust-lang/rust/pull/38580
6851 [38589]: https://github.com/rust-lang/rust/pull/38589
6852 [38670]: https://github.com/rust-lang/rust/pull/38670
6853 [38712]: https://github.com/rust-lang/rust/pull/38712
6854 [38726]: https://github.com/rust-lang/rust/pull/38726
6855 [38781]: https://github.com/rust-lang/rust/pull/38781
6856 [38798]: https://github.com/rust-lang/rust/pull/38798
6857 [38909]: https://github.com/rust-lang/rust/pull/38909
6858 [38920]: https://github.com/rust-lang/rust/pull/38920
6859 [38927]: https://github.com/rust-lang/rust/pull/38927
6860 [39048]: https://github.com/rust-lang/rust/pull/39048
6861 [39282]: https://github.com/rust-lang/rust/pull/39282
6862 [39379]: https://github.com/rust-lang/rust/pull/39379
6863 [41105]: https://github.com/rust-lang/rust/issues/41105
6864 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6865 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6866 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6867 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6868 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6869 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6870 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6871 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6872 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6873 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6874 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6875 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6876 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6877 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6878 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6879 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6880 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6881 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6882 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6883 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6884 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6885 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6886 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6887 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6888 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6889 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6890 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6891 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6892 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6895 Version 1.15.1 (2017-02-09)
6896 ===========================
6898 * [Fix IntoIter::as_mut_slice's signature][39466]
6899 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6901 [39466]: https://github.com/rust-lang/rust/pull/39466
6902 [39523]: https://github.com/rust-lang/rust/pull/39523
6905 Version 1.15.0 (2017-02-02)
6906 ===========================
6911 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6912 stable. This allows popular code-generating crates like Serde and Diesel to
6913 work ergonomically. [RFC 1681].
6914 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6915 with curly braces][36868]. Part of [RFC 1506].
6916 * [A number of minor changes to name resolution have been activated][37127].
6917 They add up to more consistent semantics, allowing for future evolution of
6918 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6919 details of what is different. The breaking changes here have been transitioned
6920 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6921 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6923 * [`?Sized` can be used in `where` clauses][37791]
6924 * [There is now a limit on the size of monomorphized types and it can be
6925 modified with the `#![type_size_limit]` crate attribute, similarly to
6926 the `#![recursion_limit]` attribute][37789]
6931 * [On Windows, the compiler will apply dllimport attributes when linking to
6932 extern functions][37973]. Additional attributes and flags can control which
6933 library kind is linked and its name. [RFC 1717].
6934 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6935 * [The `--test` flag works with procedural macro crates][38107]
6936 * [Fix `extern "aapcs" fn` ABI][37814]
6937 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6938 * [The `format!` expander recognizes incorrect `printf` and shell-style
6939 formatting directives and suggests the correct format][37613].
6940 * [Only report one error for all unused imports in an import list][37456]
6942 Compiler Performance
6943 --------------------
6945 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6946 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6947 * [Don't clone in `UnificationTable::probe`][37848]
6948 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6949 * [Use small vectors in type walker][37760]
6950 * [Macro expansion performance was improved][37701]
6951 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6952 * [Replace FNV with a faster hash function][37229]
6957 * [`std::iter::Iterator::min_by`]
6958 * [`std::iter::Iterator::max_by`]
6959 * [`std::os::*::fs::FileExt`]
6960 * [`std::sync::atomic::Atomic*::get_mut`]
6961 * [`std::sync::atomic::Atomic*::into_inner`]
6962 * [`std::vec::IntoIter::as_slice`]
6963 * [`std::vec::IntoIter::as_mut_slice`]
6964 * [`std::sync::mpsc::Receiver::try_iter`]
6965 * [`std::os::unix::process::CommandExt::before_exec`]
6966 * [`std::rc::Rc::strong_count`]
6967 * [`std::rc::Rc::weak_count`]
6968 * [`std::sync::Arc::strong_count`]
6969 * [`std::sync::Arc::weak_count`]
6970 * [`std::char::encode_utf8`]
6971 * [`std::char::encode_utf16`]
6972 * [`std::cell::Ref::clone`]
6973 * [`std::io::Take::into_inner`]
6978 * [The standard sorting algorithm has been rewritten for dramatic performance
6979 improvements][38192]. It is a hybrid merge sort, drawing influences from
6980 Timsort. Previously it was a naive merge sort.
6981 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6982 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6984 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6985 and `char_indices().last()`][37882]
6986 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6987 * [Chinese characters display correctly in `fmt::Debug`][37855]
6988 * [Derive `Default` for `Duration`][37699]
6989 * [Support creation of anonymous pipes on WinXP/2k][37677]
6990 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6991 * [Don't pass overlapped handles to processes][38835]
6996 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6997 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6998 should instead check the variable at runtime with `std::env`. That the value
6999 was set at build time was a bug, and incorrect when cross-compiling. This
7000 change is known to cause breakage.
7001 * [Add `--all` flag to `cargo test`][cargo/3221]
7002 * [Compile statically against the MSVC CRT][cargo/3363]
7003 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7004 * [Link OpenSSL statically on OSX][cargo/3311]
7005 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7006 * [Test for bad path overrides with summaries][cargo/3336]
7007 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7008 * [Fix retrying crate downloads for network errors][cargo/3348]
7009 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7010 * [Emit more info on --message-format=json][cargo/3319]
7011 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7012 * [Don't ignore errors in workspace manifest][cargo/3409]
7013 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7018 * [Test runners (binaries built with `--test`) now support a `--list` argument
7019 that lists the tests it contains][38185]
7020 * [Test runners now support a `--exact` argument that makes the test filter
7021 match exactly, instead of matching only a substring of the test name][38181]
7022 * [rustdoc supports a `--playground-url` flag][37763]
7023 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7028 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7029 continue to be used in this release by passing `--disable-rustbuild` to the
7030 configure script, but they will be deleted soon. Note that the new build
7031 system uses a different on-disk layout that will likely affect any scripts
7033 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7035 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7036 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7042 * [A number of minor changes to name resolution have been activated][37127].
7043 They add up to more consistent semantics, allowing for future evolution of
7044 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7045 details of what is different. The breaking changes here have been transitioned
7046 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7047 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7048 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7049 should instead check the variable at runtime with `std::env`. That the value
7050 was set at build time was a bug, and incorrect when cross-compiling. This
7051 change is known to cause breakage.
7052 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7053 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7054 1.10 and is now an error by default. It will become a hard error in the near
7056 * [The semantics relating modules to file system directories are changing in
7057 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7058 lint, which is a warning in this release, and will become a hard error in the
7060 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7061 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7062 the underlying iterator][37834]
7064 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7065 [33685]: https://github.com/rust-lang/rust/issues/33685
7066 [36868]: https://github.com/rust-lang/rust/pull/36868
7067 [37127]: https://github.com/rust-lang/rust/pull/37127
7068 [37229]: https://github.com/rust-lang/rust/pull/37229
7069 [37456]: https://github.com/rust-lang/rust/pull/37456
7070 [37527]: https://github.com/rust-lang/rust/pull/37527
7071 [37602]: https://github.com/rust-lang/rust/pull/37602
7072 [37613]: https://github.com/rust-lang/rust/pull/37613
7073 [37615]: https://github.com/rust-lang/rust/pull/37615
7074 [37636]: https://github.com/rust-lang/rust/pull/37636
7075 [37627]: https://github.com/rust-lang/rust/pull/37627
7076 [37642]: https://github.com/rust-lang/rust/pull/37642
7077 [37677]: https://github.com/rust-lang/rust/pull/37677
7078 [37699]: https://github.com/rust-lang/rust/pull/37699
7079 [37701]: https://github.com/rust-lang/rust/pull/37701
7080 [37705]: https://github.com/rust-lang/rust/pull/37705
7081 [37749]: https://github.com/rust-lang/rust/pull/37749
7082 [37760]: https://github.com/rust-lang/rust/pull/37760
7083 [37763]: https://github.com/rust-lang/rust/pull/37763
7084 [37764]: https://github.com/rust-lang/rust/pull/37764
7085 [37789]: https://github.com/rust-lang/rust/pull/37789
7086 [37791]: https://github.com/rust-lang/rust/pull/37791
7087 [37814]: https://github.com/rust-lang/rust/pull/37814
7088 [37817]: https://github.com/rust-lang/rust/pull/37817
7089 [37834]: https://github.com/rust-lang/rust/pull/37834
7090 [37848]: https://github.com/rust-lang/rust/pull/37848
7091 [37855]: https://github.com/rust-lang/rust/pull/37855
7092 [37882]: https://github.com/rust-lang/rust/pull/37882
7093 [37888]: https://github.com/rust-lang/rust/pull/37888
7094 [37973]: https://github.com/rust-lang/rust/pull/37973
7095 [37979]: https://github.com/rust-lang/rust/pull/37979
7096 [38086]: https://github.com/rust-lang/rust/pull/38086
7097 [38107]: https://github.com/rust-lang/rust/pull/38107
7098 [38117]: https://github.com/rust-lang/rust/pull/38117
7099 [38134]: https://github.com/rust-lang/rust/pull/38134
7100 [38146]: https://github.com/rust-lang/rust/pull/38146
7101 [38181]: https://github.com/rust-lang/rust/pull/38181
7102 [38182]: https://github.com/rust-lang/rust/pull/38182
7103 [38185]: https://github.com/rust-lang/rust/pull/38185
7104 [38192]: https://github.com/rust-lang/rust/pull/38192
7105 [38279]: https://github.com/rust-lang/rust/pull/38279
7106 [38835]: https://github.com/rust-lang/rust/pull/38835
7107 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7108 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7109 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7110 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7111 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7112 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7113 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7114 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7115 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7116 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7117 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7118 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7119 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7120 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7121 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7122 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7123 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7124 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7125 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7126 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7127 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7128 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7129 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7130 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7131 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7132 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7133 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7134 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7135 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7136 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7137 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7138 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7139 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7140 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7141 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7142 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7143 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7146 Version 1.14.0 (2016-12-22)
7147 ===========================
7152 * [`..` matches multiple tuple fields in enum variants, structs
7153 and tuples][36843]. [RFC 1492].
7154 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7155 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7156 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7157 dereferencing][36822]
7162 * [Mark enums with non-zero discriminant as non-zero][37224]
7163 * [Lower-case `static mut` names are linted like other
7164 statics and consts][37162]
7165 * [Fix ICE on some macros in const integer positions
7166 (e.g. `[u8; m!()]`)][36819]
7167 * [Improve error message and snippet for "did you mean `x`"][36798]
7168 * [Add a panic-strategy field to the target specification][36794]
7169 * [Include LLVM version in `--version --verbose`][37200]
7171 Compile-time Optimizations
7172 --------------------------
7174 * [Improve macro expansion performance][37569]
7175 * [Shrink `Expr_::ExprInlineAsm`][37445]
7176 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7177 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7178 * [Avoid more allocations when compiling html5ever][37373]
7179 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7180 * [Avoid some allocations in the macro parser][37318]
7181 * [Use a faster deflate setting][37298]
7182 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7183 during interning of slices][37270]
7184 * [Optimize `write_metadata`][37267]
7185 * [Don't process obligation forest cycles when stalled][37231]
7186 * [Avoid many `CrateConfig` clones][37161]
7187 * [Optimize `Substs::super_fold_with`][37108]
7188 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7189 * [Speed up `plug_leaks`][36917]
7194 * [`println!()`, with no arguments, prints newline][36825].
7195 Previously, an empty string was required to achieve the same.
7196 * [`Wrapping` impls standard binary and unary operators, as well as
7197 the `Sum` and `Product` iterators][37356]
7198 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7200 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7201 `VecDeque` iterators][37315]
7202 * [Improve `SipHasher` performance on small values][37312]
7203 * [Add Iterator trait TrustedLen to enable better FromIterator /
7205 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7206 * [`ReadDir` implements `Debug`][37221]
7207 * [Implement `RefUnwindSafe` for atomic types][37178]
7208 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7209 * [Avoid allocations in `Decoder::read_str`][37064]
7210 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7211 * [Impl `Debug` for raw pointers to unsized data][36880]
7212 * [Don't reuse `HashMap` random seeds][37470]
7213 * [The internal memory layout of `HashMap` is more cache-friendly, for
7214 significant improvements in some operations][36692]
7215 * [`HashMap` uses less memory on 32-bit architectures][36595]
7216 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7221 * [Expose rustc cfg values to build scripts][cargo/3243]
7222 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7223 * [Fix passing --features when testing multiple packages][cargo/3280]
7224 * [Use a single profile set per workspace][cargo/3249]
7225 * [Load `replace` sections from lock files][cargo/3220]
7226 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7231 * [rustup is the recommended Rust installation method][1.14rustup]
7232 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7233 S390x. These are [tier 2] platforms and may have major defects. Follow the
7234 instructions on the website to install, or add the targets to an existing
7235 installation with `rustup target add`. The new target triples are:
7236 - `mips-unknown-linux-gnu`
7237 - `mipsel-unknown-linux-gnu`
7238 - `mips64-unknown-linux-gnuabi64`
7239 - `mips64el-unknown-linux-gnuabi64 `
7240 - `powerpc-unknown-linux-gnu`
7241 - `powerpc64-unknown-linux-gnu`
7242 - `powerpc64le-unknown-linux-gnu`
7243 - `s390x-unknown-linux-gnu `
7244 * This release includes target (std) builds for ARM Linux running MUSL
7245 libc. These are [tier 2] platforms and may have major defects. Add the
7246 following triples to an existing rustup installation with `rustup target add`:
7247 - `arm-unknown-linux-musleabi`
7248 - `arm-unknown-linux-musleabihf`
7249 - `armv7-unknown-linux-musleabihf`
7250 * This release includes [experimental support for WebAssembly][1.14wasm], via
7251 the `wasm32-unknown-emscripten` target. This target is known to have major
7252 defects. Please test, report, and fix.
7253 * rustup no longer installs documentation by default. Run `rustup
7254 component add rust-docs` to install.
7255 * [Fix line stepping in debugger][37310]
7256 * [Enable line number debuginfo in releases][37280]
7261 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7262 * [Add support for Fuchsia OS][37313]
7263 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7268 * [A number of forward-compatibility lints used by the compiler
7269 to gradually introduce language changes have been converted
7270 to deny by default][36894]:
7271 - ["use of inaccessible extern crate erroneously allowed"][36886]
7272 - ["type parameter default erroneously allowed in invalid location"][36887]
7273 - ["detects super or self keywords at the beginning of global path"][36888]
7274 - ["two overlapping inherent impls define an item with the same name
7275 were erroneously allowed"][36889]
7276 - ["floating-point constants cannot be used in patterns"][36890]
7277 - ["constants of struct or enum type can only be used in a pattern if
7278 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7279 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7280 * [Prohibit patterns in trait methods without bodies][37378]
7281 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7282 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7283 * [The `$crate` macro variable is accepted in fewer locations][37213]
7284 * [Impls specifying extra region requirements beyond the trait
7285 they implement are rejected][37167]
7286 * [Enums may not be unsized][37111]. Unsized enums are intended to
7287 work but never have. For now they are forbidden.
7288 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7290 [tier 2]: https://forge.rust-lang.org/platform-support.html
7291 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7292 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7293 [36430]: https://github.com/rust-lang/rust/pull/36430
7294 [36595]: https://github.com/rust-lang/rust/pull/36595
7295 [36692]: https://github.com/rust-lang/rust/pull/36692
7296 [36767]: https://github.com/rust-lang/rust/pull/36767
7297 [36794]: https://github.com/rust-lang/rust/pull/36794
7298 [36798]: https://github.com/rust-lang/rust/pull/36798
7299 [36819]: https://github.com/rust-lang/rust/pull/36819
7300 [36822]: https://github.com/rust-lang/rust/pull/36822
7301 [36825]: https://github.com/rust-lang/rust/pull/36825
7302 [36843]: https://github.com/rust-lang/rust/pull/36843
7303 [36880]: https://github.com/rust-lang/rust/pull/36880
7304 [36886]: https://github.com/rust-lang/rust/issues/36886
7305 [36887]: https://github.com/rust-lang/rust/issues/36887
7306 [36888]: https://github.com/rust-lang/rust/issues/36888
7307 [36889]: https://github.com/rust-lang/rust/issues/36889
7308 [36890]: https://github.com/rust-lang/rust/issues/36890
7309 [36891]: https://github.com/rust-lang/rust/issues/36891
7310 [36892]: https://github.com/rust-lang/rust/issues/36892
7311 [36894]: https://github.com/rust-lang/rust/pull/36894
7312 [36917]: https://github.com/rust-lang/rust/pull/36917
7313 [36993]: https://github.com/rust-lang/rust/pull/36993
7314 [37037]: https://github.com/rust-lang/rust/pull/37037
7315 [37064]: https://github.com/rust-lang/rust/pull/37064
7316 [37094]: https://github.com/rust-lang/rust/pull/37094
7317 [37108]: https://github.com/rust-lang/rust/pull/37108
7318 [37111]: https://github.com/rust-lang/rust/pull/37111
7319 [37161]: https://github.com/rust-lang/rust/pull/37161
7320 [37162]: https://github.com/rust-lang/rust/pull/37162
7321 [37167]: https://github.com/rust-lang/rust/pull/37167
7322 [37178]: https://github.com/rust-lang/rust/pull/37178
7323 [37200]: https://github.com/rust-lang/rust/pull/37200
7324 [37213]: https://github.com/rust-lang/rust/pull/37213
7325 [37221]: https://github.com/rust-lang/rust/pull/37221
7326 [37224]: https://github.com/rust-lang/rust/pull/37224
7327 [37230]: https://github.com/rust-lang/rust/pull/37230
7328 [37231]: https://github.com/rust-lang/rust/pull/37231
7329 [37247]: https://github.com/rust-lang/rust/pull/37247
7330 [37267]: https://github.com/rust-lang/rust/pull/37267
7331 [37270]: https://github.com/rust-lang/rust/pull/37270
7332 [37273]: https://github.com/rust-lang/rust/pull/37273
7333 [37280]: https://github.com/rust-lang/rust/pull/37280
7334 [37298]: https://github.com/rust-lang/rust/pull/37298
7335 [37306]: https://github.com/rust-lang/rust/pull/37306
7336 [37310]: https://github.com/rust-lang/rust/pull/37310
7337 [37312]: https://github.com/rust-lang/rust/pull/37312
7338 [37313]: https://github.com/rust-lang/rust/pull/37313
7339 [37315]: https://github.com/rust-lang/rust/pull/37315
7340 [37318]: https://github.com/rust-lang/rust/pull/37318
7341 [37322]: https://github.com/rust-lang/rust/pull/37322
7342 [37326]: https://github.com/rust-lang/rust/pull/37326
7343 [37351]: https://github.com/rust-lang/rust/pull/37351
7344 [37356]: https://github.com/rust-lang/rust/pull/37356
7345 [37367]: https://github.com/rust-lang/rust/pull/37367
7346 [37373]: https://github.com/rust-lang/rust/pull/37373
7347 [37378]: https://github.com/rust-lang/rust/pull/37378
7348 [37389]: https://github.com/rust-lang/rust/pull/37389
7349 [37392]: https://github.com/rust-lang/rust/pull/37392
7350 [37427]: https://github.com/rust-lang/rust/pull/37427
7351 [37439]: https://github.com/rust-lang/rust/pull/37439
7352 [37445]: https://github.com/rust-lang/rust/pull/37445
7353 [37470]: https://github.com/rust-lang/rust/pull/37470
7354 [37569]: https://github.com/rust-lang/rust/pull/37569
7355 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7356 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7357 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7358 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7359 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7360 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7361 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7364 Version 1.13.0 (2016-11-10)
7365 ===========================
7370 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7371 errors, like the `try!` macro, described in [RFC 0243].
7372 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7373 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7374 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7375 * [Fix lifetime rules for 'if' conditions][36029]
7376 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7381 * [Add the `-C link-arg` argument][36574]
7382 * [Remove the old AST-based backend from rustc_trans][35764]
7383 * [Don't enable NEON by default on armv7 Linux][35814]
7384 * [Fix debug line number info for macro expansions][35238]
7385 * [Do not emit "class method" debuginfo for types that are not
7386 DICompositeType][36008]
7387 * [Warn about multiple conflicting #[repr] hints][34623]
7388 * [When sizing DST, don't double-count nested struct prefixes][36351]
7389 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7390 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7391 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7392 * [Expand macros without recursing to avoid stack overflows][36214]
7397 * [Replace macro backtraces with labeled local uses][35702]
7398 * [Improve error message for misplaced doc comments][33922]
7399 * [Buffer unix and lock windows to prevent message interleaving][35975]
7400 * [Update lifetime errors to specifically note temporaries][36171]
7401 * [Special case a few colors for Windows][36178]
7402 * [Suggest `use self` when such an import resolves][36289]
7403 * [Be more specific when type parameter shadows primitive type][36338]
7404 * Many minor improvements
7406 Compile-time Optimizations
7407 --------------------------
7409 * [Compute and cache HIR hashes at beginning][35854]
7410 * [Don't hash types in loan paths][36004]
7411 * [Cache projections in trans][35761]
7412 * [Optimize the parser's last token handling][36527]
7413 * [Only instantiate #[inline] functions in codegen units referencing
7414 them][36524]. This leads to big improvements in cases where crates export
7415 define many inline functions without using them directly.
7416 * [Lazily allocate TypedArena's first chunk][36592]
7417 * [Don't allocate during default HashSet creation][36734]
7424 * [`overflowing_abs`]
7425 * [`RefCell::try_borrow`]
7426 * [`RefCell::try_borrow_mut`]
7431 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7432 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7434 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7435 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7436 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7437 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7438 * [Use arc4rand on FreeBSD][35884]
7439 * [memrchr: Correct aligned offset computation][35969]
7440 * [Improve Demangling of Rust Symbols][36059]
7441 * [Use monotonic time in condition variables][35048]
7442 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7443 * [Implement conversion traits for `char`][35755]
7444 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7445 * [Zero first byte of CString on drop][36264]
7446 * [Inherit overflow checks for sum and product][36372]
7447 * [Add missing Eq implementations][36423]
7448 * [Implement `Debug` for `DirEntry`][36631]
7449 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7451 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7452 * [Implement more traits for `std::io::ErrorKind`][35911]
7453 * [Optimize BinaryHeap bounds checking][36072]
7454 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7455 `extend_with_element`][36355]
7456 * [Fix overflow checking in unsigned pow()][34942]
7461 * This release includes security fixes to both curl and OpenSSL.
7462 * [Fix transitive doctests when panic=abort][cargo/3021]
7463 * [Add --all-features flag to cargo][cargo/3038]
7464 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7465 * [Don't parse the home directory more than once][cargo/3078]
7466 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7467 * [Update OpenSSL to 1.0.2j][cargo/3121]
7468 * [Add license and license_file to cargo metadata output][cargo/3110]
7469 * [Make crates-io registry URL optional in config; ignore all changes to
7470 source.crates-io][cargo/3089]
7471 * [Don't download dependencies from other platforms][cargo/3123]
7472 * [Build transitive dev-dependencies when needed][cargo/3125]
7473 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7474 * [Avoid updating registry when adding existing deps][cargo/3144]
7475 * [Warn about path overrides that won't work][cargo/3136]
7476 * [Use workspaces during `cargo install`][cargo/3146]
7477 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7478 * [Add --message-format flag][cargo/3000]
7479 * [Pass target environment for rustdoc][cargo/3205]
7480 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7481 * [Update curl and curl-sys][cargo/3241]
7482 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7487 * [rustdoc: Add the `--sysroot` argument][36586]
7488 * [rustdoc: Fix a couple of issues with the search results][35655]
7489 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7490 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7491 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7496 * [Remove unmaintained style guide][35124]
7497 * [Add s390x support][36369]
7498 * [Initial work at Haiku OS support][36727]
7499 * [Add mips-uclibc targets][35734]
7500 * [Crate-ify compiler-rt into compiler-builtins][35021]
7501 * [Add rustc version info (git hash + date) to dist tarball][36213]
7502 * Many documentation improvements
7507 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7508 * [Deny (by default) transmuting from fn item types to pointer-sized
7509 types][34923]. Continuing the long transition to zero-sized fn items,
7511 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7513 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7514 * [Fix lifetime rules for 'if' conditions][36029].
7515 * [Inherit overflow checks for sum and product][36372].
7516 * [Forbid user-defined macros named "macro_rules"][36730].
7518 [33922]: https://github.com/rust-lang/rust/pull/33922
7519 [34623]: https://github.com/rust-lang/rust/pull/34623
7520 [34923]: https://github.com/rust-lang/rust/pull/34923
7521 [34942]: https://github.com/rust-lang/rust/pull/34942
7522 [35021]: https://github.com/rust-lang/rust/pull/35021
7523 [35048]: https://github.com/rust-lang/rust/pull/35048
7524 [35074]: https://github.com/rust-lang/rust/pull/35074
7525 [35124]: https://github.com/rust-lang/rust/pull/35124
7526 [35234]: https://github.com/rust-lang/rust/pull/35234
7527 [35238]: https://github.com/rust-lang/rust/pull/35238
7528 [35354]: https://github.com/rust-lang/rust/pull/35354
7529 [35559]: https://github.com/rust-lang/rust/pull/35559
7530 [35585]: https://github.com/rust-lang/rust/pull/35585
7531 [35627]: https://github.com/rust-lang/rust/pull/35627
7532 [35655]: https://github.com/rust-lang/rust/pull/35655
7533 [35702]: https://github.com/rust-lang/rust/pull/35702
7534 [35707]: https://github.com/rust-lang/rust/pull/35707
7535 [35728]: https://github.com/rust-lang/rust/pull/35728
7536 [35734]: https://github.com/rust-lang/rust/pull/35734
7537 [35755]: https://github.com/rust-lang/rust/pull/35755
7538 [35761]: https://github.com/rust-lang/rust/pull/35761
7539 [35764]: https://github.com/rust-lang/rust/pull/35764
7540 [35814]: https://github.com/rust-lang/rust/pull/35814
7541 [35854]: https://github.com/rust-lang/rust/pull/35854
7542 [35871]: https://github.com/rust-lang/rust/pull/35871
7543 [35884]: https://github.com/rust-lang/rust/pull/35884
7544 [35911]: https://github.com/rust-lang/rust/pull/35911
7545 [35969]: https://github.com/rust-lang/rust/pull/35969
7546 [35975]: https://github.com/rust-lang/rust/pull/35975
7547 [36004]: https://github.com/rust-lang/rust/pull/36004
7548 [36008]: https://github.com/rust-lang/rust/pull/36008
7549 [36014]: https://github.com/rust-lang/rust/pull/36014
7550 [36029]: https://github.com/rust-lang/rust/pull/36029
7551 [36059]: https://github.com/rust-lang/rust/pull/36059
7552 [36072]: https://github.com/rust-lang/rust/pull/36072
7553 [36101]: https://github.com/rust-lang/rust/pull/36101
7554 [36104]: https://github.com/rust-lang/rust/pull/36104
7555 [36171]: https://github.com/rust-lang/rust/pull/36171
7556 [36173]: https://github.com/rust-lang/rust/pull/36173
7557 [36178]: https://github.com/rust-lang/rust/pull/36178
7558 [36213]: https://github.com/rust-lang/rust/pull/36213
7559 [36214]: https://github.com/rust-lang/rust/pull/36214
7560 [36264]: https://github.com/rust-lang/rust/pull/36264
7561 [36266]: https://github.com/rust-lang/rust/pull/36266
7562 [36289]: https://github.com/rust-lang/rust/pull/36289
7563 [36338]: https://github.com/rust-lang/rust/pull/36338
7564 [36351]: https://github.com/rust-lang/rust/pull/36351
7565 [36355]: https://github.com/rust-lang/rust/pull/36355
7566 [36369]: https://github.com/rust-lang/rust/pull/36369
7567 [36372]: https://github.com/rust-lang/rust/pull/36372
7568 [36423]: https://github.com/rust-lang/rust/pull/36423
7569 [36482]: https://github.com/rust-lang/rust/pull/36482
7570 [36505]: https://github.com/rust-lang/rust/pull/36505
7571 [36524]: https://github.com/rust-lang/rust/pull/36524
7572 [36527]: https://github.com/rust-lang/rust/pull/36527
7573 [36551]: https://github.com/rust-lang/rust/pull/36551
7574 [36574]: https://github.com/rust-lang/rust/pull/36574
7575 [36586]: https://github.com/rust-lang/rust/pull/36586
7576 [36592]: https://github.com/rust-lang/rust/pull/36592
7577 [36631]: https://github.com/rust-lang/rust/pull/36631
7578 [36721]: https://github.com/rust-lang/rust/pull/36721
7579 [36727]: https://github.com/rust-lang/rust/pull/36727
7580 [36730]: https://github.com/rust-lang/rust/pull/36730
7581 [36734]: https://github.com/rust-lang/rust/pull/36734
7582 [36754]: https://github.com/rust-lang/rust/pull/36754
7583 [36995]: https://github.com/rust-lang/rust/pull/36995
7584 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7585 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7586 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7587 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7588 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7589 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7590 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7591 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7592 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7593 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7594 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7595 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7596 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7597 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7598 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7599 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7600 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7601 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7602 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7603 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7604 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7605 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7606 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7607 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7608 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7609 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7610 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7611 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7612 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7613 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7614 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7615 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7618 Version 1.12.1 (2016-10-20)
7619 ===========================
7624 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7625 * [Confusion with double negation and booleans][36856]
7626 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7627 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7628 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7629 * [Corrupted memory after updated to 1.12][36936]
7630 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7631 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7632 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7634 [36381]: https://github.com/rust-lang/rust/issues/36381
7635 [36856]: https://github.com/rust-lang/rust/issues/36856
7636 [36875]: https://github.com/rust-lang/rust/issues/36875
7637 [36924]: https://github.com/rust-lang/rust/issues/36924
7638 [36926]: https://github.com/rust-lang/rust/issues/36926
7639 [36936]: https://github.com/rust-lang/rust/issues/36936
7640 [37026]: https://github.com/rust-lang/rust/issues/37026
7641 [37112]: https://github.com/rust-lang/rust/issues/37112
7642 [37153]: https://github.com/rust-lang/rust/issues/37153
7645 Version 1.12.0 (2016-09-29)
7646 ===========================
7651 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7652 This translation pass is far simpler than the previous AST->LLVM pass, and
7653 creates opportunities to perform new optimizations directly on the MIR. It
7654 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7655 * [`rustc` presents a new, more readable error format, along with
7656 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7657 Most common editors supporting Rust have been updated to work with it. It was
7658 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7663 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7664 This translation pass is far simpler than the previous AST->LLVM pass, and
7665 creates opportunities to perform new optimizations directly on the MIR. It
7666 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7667 * [Print the Rust target name, not the LLVM target name, with
7668 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7669 * [The computation of `TypeId` is correct in some cases where it was previously
7670 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7671 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7672 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7673 `--print relocation-models`, and `--print code-models` print the available
7674 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7675 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7676 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7677 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7678 These targets produce statically-linked binaries. There are no binary release
7684 * [`rustc` presents a new, more readable error format, along with
7685 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7686 Most common editors supporting Rust have been updated to work with it. It was
7687 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7688 * [In error descriptions, references are now described in plain English,
7689 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7690 * [In error type descriptions, unknown numeric types are named `{integer}` or
7691 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7692 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7697 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7698 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7699 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7700 useful](https://github.com/rust-lang/rust/pull/34908)
7701 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7702 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7703 * [Semicolons are properly required as statement delimiters inside
7704 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7705 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7710 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7711 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7712 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7713 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7714 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7715 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7716 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7717 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7718 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7719 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7720 Both on Unix and Windows.
7721 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7722 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7723 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7724 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7725 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7726 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7727 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7728 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7733 * [The `format!` macro and friends now allow a single argument to be formatted
7734 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7735 * [The lifetime bounds on `[T]::binary_search_by` and
7736 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7737 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7738 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7739 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7740 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7741 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7742 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7743 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7744 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7745 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7746 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7747 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7748 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7749 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7750 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7751 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7752 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7753 * [`mpsc::sync_channel` `Receiver`s return any available message before
7754 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7755 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7756 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7761 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7762 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7763 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7764 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7765 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7766 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7767 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7768 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7769 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7770 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7771 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7772 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7773 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7774 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7775 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7776 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7781 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7782 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7787 * [Test binaries now support a `--test-threads` argument to specify the number
7788 of threads used to run tests, and which acts the same as the
7789 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7790 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7791 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7792 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7793 * [Rust releases now come with source packages that can be installed by rustup
7794 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7795 The resulting source code can be used by tools and IDES, located in the
7796 sysroot under `lib/rustlib/src`.
7801 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7802 * Many minor improvements to the documentation.
7803 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7808 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7809 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7810 * [When formatting strings, if "precision" is specified, the "fill",
7811 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7812 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7815 Version 1.11.0 (2016-08-18)
7816 ===========================
7821 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7822 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7823 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7824 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7829 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7830 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7831 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7832 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7833 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7834 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7835 (in libcore - previously stabilized in libstd)
7836 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7837 (in libcore - previously stabilized in libstd)
7838 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7839 (in libcore - previously stabilized in libstd)
7840 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7841 (in libcore - previously stabilized in libstd)
7842 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7843 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7844 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7845 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7850 * [The `thread_local!` macro supports multiple definitions in a single
7851 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7852 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7853 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7854 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7855 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7856 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7857 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7858 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7863 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7864 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7865 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7866 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7867 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7868 and `-vv` prints warnings for all crates.
7869 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7870 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7871 This provides room for expansion by arbitrary tools.
7872 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7873 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7874 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7875 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7876 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7877 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7878 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7883 * [Caching projections speeds up type check dramatically for some
7884 workloads](https://github.com/rust-lang/rust/pull/33816)
7885 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7886 This hasher is faster, but is believed to provide sufficient
7887 protection from collision attacks.
7888 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7893 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7894 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7895 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7896 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7897 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7902 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7903 * [When emitting debug info, rustc emits frame pointers for closures,
7904 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7905 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7906 * Many more errors have been given error codes and extended
7908 * API documentation continues to be improved, with many new examples
7913 * [rustc no longer hangs when dependencies recursively re-export
7914 submodules](https://github.com/rust-lang/rust/pull/34542)
7915 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7916 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7917 rewritten](https://github.com/rust-lang/rust/pull/33895)
7918 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7919 No targets use this yet, but it works toward AVR support.
7924 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7925 * [The new follow-set rules that place restrictions on `macro_rules!`
7926 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7927 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7928 and has been a warning since 1.10.
7929 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7930 This causes breakage in some corner cases.
7933 Version 1.10.0 (2016-07-07)
7934 ===========================
7939 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7940 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7941 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7942 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7943 * [`panic!` can be converted to a runtime abort with the
7944 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7945 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7946 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7947 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7948 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7949 Note that Cargo does not yet directly support cdylibs.
7954 * `os::windows::fs::OpenOptionsExt::access_mode`
7955 * `os::windows::fs::OpenOptionsExt::share_mode`
7956 * `os::windows::fs::OpenOptionsExt::custom_flags`
7957 * `os::windows::fs::OpenOptionsExt::attributes`
7958 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7959 * `os::unix::fs::OpenOptionsExt::custom_flags`
7960 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7961 * `Default for sync::Weak`
7962 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7963 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7964 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7965 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7966 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7967 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7968 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7969 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7970 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7971 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7972 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7973 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7974 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7975 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7976 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7977 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7978 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7979 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7980 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7981 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7982 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7983 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7984 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7985 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7986 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7987 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7988 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7989 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7990 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7991 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7992 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7993 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7994 * Read/Write/RawFd impls for `UnixStream`
7995 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7996 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7997 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7998 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7999 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8000 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8001 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8002 * RawFd impls for `UnixListener`
8003 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8004 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8005 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8006 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8007 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8008 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8009 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8010 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8011 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8012 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8013 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8014 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8015 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8016 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8017 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8018 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8019 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8020 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8021 * RawFd impls for `UnixDatagram`
8022 * `{BTree,Hash}Map::values_mut`
8023 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8028 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8029 The semantics of this minor method are subtle and probably not what
8031 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8032 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8033 will fall back to `/dev/urandom` temporarily to avoid blocking
8034 during early boot](https://github.com/rust-lang/rust/pull/33086).
8035 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8036 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8037 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8038 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8039 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8040 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8041 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8045 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8046 This controls the runtime behavior of the `panic!` macro
8047 and can be either "unwind" (the default), or "abort".
8048 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8049 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8050 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8051 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8052 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8053 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8054 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8055 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8056 By default they are retried twice, which can be customized with the
8057 `net.retry` value in `.cargo/config`.
8058 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8059 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8060 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8061 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8062 Makes it possible to install multiple crates in parallel.
8063 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8064 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8065 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8066 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8067 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8068 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8073 * [rustc memory usage was reduced by refactoring the context used for
8074 type checking](https://github.com/rust-lang/rust/pull/33425).
8075 * [Speed up creation of `HashMap`s by caching the random keys used
8076 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8077 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8078 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8079 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8080 10x faster than the previous lookup tables.
8081 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8086 * Many incremental improvements to documentation and rustdoc.
8087 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8088 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8089 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8090 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8091 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8092 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8093 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8098 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8099 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8100 * [`std` no longer prints backtraces on platforms where the running
8101 module must be loaded with `env::current_exe`, which can't be relied
8102 on](https://github.com/rust-lang/rust/pull/33554).
8103 * This release includes std binaries for the i586-unknown-linux-gnu,
8104 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8105 i586 target is for old x86 hardware without SSE2, and the armv7
8106 target is for Android running on modern ARM architectures.
8107 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8108 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8109 * [On Unix the runtime aborts by calling `libc::abort` instead of
8110 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8111 * [Rust is now bootstrapped from the previous release of Rust,
8112 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8117 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8118 * [`target_env` for Linux ARM targets is just `gnu`, not
8119 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8120 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8121 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8122 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8123 Affects how macros are parsed.
8124 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8125 * [Feature-gated attributes on macro-generated macro invocations are
8126 now rejected](https://github.com/rust-lang/rust/pull/32791).
8127 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8128 This caused some minor changes to type inference.
8131 Version 1.9.0 (2016-05-26)
8132 ==========================
8137 * The `#[deprecated]` attribute when applied to an API will generate
8138 warnings when used. The warnings may be suppressed with
8139 `#[allow(deprecated)]`. [RFC 1270].
8140 * [`fn` item types are zero sized, and each `fn` names a unique
8141 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8142 `transmute` on a `fn` type will generate a warning for a few cycles,
8143 then will be converted to an error.
8144 * [Field and method resolution understand visibility, so private
8145 fields and methods cannot prevent the proper use of public fields
8146 and methods][1.9fv].
8147 * [The parser considers unicode codepoints in the
8148 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8154 * [`std::panic::catch_unwind`] (renamed from `recover`)
8155 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8156 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8157 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8158 * [`str::is_char_boundary`]
8159 * [`<*const T>::as_ref`]
8160 * [`<*mut T>::as_ref`]
8161 * [`<*mut T>::as_mut`]
8162 * [`AsciiExt::make_ascii_uppercase`]
8163 * [`AsciiExt::make_ascii_lowercase`]
8164 * [`char::decode_utf16`]
8165 * [`char::DecodeUtf16`]
8166 * [`char::DecodeUtf16Error`]
8167 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8168 * [`BTreeSet::take`]
8169 * [`BTreeSet::replace`]
8172 * [`HashSet::replace`]
8174 * [`OsString::with_capacity`]
8175 * [`OsString::clear`]
8176 * [`OsString::capacity`]
8177 * [`OsString::reserve`]
8178 * [`OsString::reserve_exact`]
8179 * [`OsStr::is_empty`]
8181 * [`std::os::unix::thread`]
8184 * [`JoinHandleExt::as_pthread_t`]
8185 * [`JoinHandleExt::into_pthread_t`]
8186 * [`HashSet::hasher`]
8187 * [`HashMap::hasher`]
8188 * [`CommandExt::exec`]
8189 * [`File::try_clone`]
8190 * [`SocketAddr::set_ip`]
8191 * [`SocketAddr::set_port`]
8192 * [`SocketAddrV4::set_ip`]
8193 * [`SocketAddrV4::set_port`]
8194 * [`SocketAddrV6::set_ip`]
8195 * [`SocketAddrV6::set_port`]
8196 * [`SocketAddrV6::set_flowinfo`]
8197 * [`SocketAddrV6::set_scope_id`]
8198 * [`slice::copy_from_slice`]
8199 * [`ptr::read_volatile`]
8200 * [`ptr::write_volatile`]
8201 * [`OpenOptions::create_new`]
8202 * [`TcpStream::set_nodelay`]
8203 * [`TcpStream::nodelay`]
8204 * [`TcpStream::set_ttl`]
8205 * [`TcpStream::ttl`]
8206 * [`TcpStream::set_only_v6`]
8207 * [`TcpStream::only_v6`]
8208 * [`TcpStream::take_error`]
8209 * [`TcpStream::set_nonblocking`]
8210 * [`TcpListener::set_ttl`]
8211 * [`TcpListener::ttl`]
8212 * [`TcpListener::set_only_v6`]
8213 * [`TcpListener::only_v6`]
8214 * [`TcpListener::take_error`]
8215 * [`TcpListener::set_nonblocking`]
8216 * [`UdpSocket::set_broadcast`]
8217 * [`UdpSocket::broadcast`]
8218 * [`UdpSocket::set_multicast_loop_v4`]
8219 * [`UdpSocket::multicast_loop_v4`]
8220 * [`UdpSocket::set_multicast_ttl_v4`]
8221 * [`UdpSocket::multicast_ttl_v4`]
8222 * [`UdpSocket::set_multicast_loop_v6`]
8223 * [`UdpSocket::multicast_loop_v6`]
8224 * [`UdpSocket::set_multicast_ttl_v6`]
8225 * [`UdpSocket::multicast_ttl_v6`]
8226 * [`UdpSocket::set_ttl`]
8227 * [`UdpSocket::ttl`]
8228 * [`UdpSocket::set_only_v6`]
8229 * [`UdpSocket::only_v6`]
8230 * [`UdpSocket::join_multicast_v4`]
8231 * [`UdpSocket::join_multicast_v6`]
8232 * [`UdpSocket::leave_multicast_v4`]
8233 * [`UdpSocket::leave_multicast_v6`]
8234 * [`UdpSocket::take_error`]
8235 * [`UdpSocket::connect`]
8236 * [`UdpSocket::send`]
8237 * [`UdpSocket::recv`]
8238 * [`UdpSocket::set_nonblocking`]
8243 * [`std::sync::Once` is poisoned if its initialization function
8245 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8246 * [Most types implement `fmt::Debug`][1.9db].
8247 * [The default buffer size used by `BufReader` and `BufWriter` was
8248 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8249 used by other languages.
8250 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8251 `Duration` additionally implements `*=` and `/=`][1.9ta].
8252 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8253 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8254 * [`Chain` implements `BufRead`][1.9ch].
8255 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8260 * [Cargo can now run concurrently][1.9cc].
8261 * [Top-level overrides allow specific revisions of crates to be
8262 overridden through the entire crate graph][1.9ct]. This is intended
8263 to make upgrades easier for large projects, by allowing crates to be
8264 forked temporarily until they've been upgraded and republished.
8265 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8266 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8267 on the commandline][1.9cf]. `rustc` arguments can also be specified
8268 in the `build.rustflags` configuration key.
8273 * [The time complexity of comparing variables for equivalence during type
8274 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8275 to major compilation time improvement in some scenarios.
8276 * [`ToString` is specialized for `str`, giving it the same performance
8277 as `to_owned`][1.9ts].
8278 * [Spawning processes with `Command::output` no longer creates extra
8280 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8281 for C-like enums][1.9cl].
8286 * [Passing the `--quiet` flag to a test runner will produce
8287 much-abbreviated output][1.9q].
8288 * The Rust Project now publishes std binaries for the
8289 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8290 `i586-pc-windows-msvc` targets.
8295 * [`std::sync::Once` is poisoned if its initialization function
8297 * [It is illegal to define methods with the same name in overlapping
8298 inherent `impl` blocks][1.9sn].
8299 * [`fn` item types are zero sized, and each `fn` names a unique
8300 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8301 `transmute` on a `fn` type will generate a warning for a few cycles,
8302 then will be converted to an error.
8303 * [Improvements to const evaluation may trigger new errors when integer
8304 literals are out of range][1.9ce].
8307 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8308 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8309 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8310 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8311 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8312 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8313 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8314 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8315 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8316 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8317 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8318 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8319 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8320 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8321 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8322 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8323 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8324 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8325 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8326 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8327 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8328 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8329 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8330 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8331 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8332 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8333 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8334 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8335 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8336 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8337 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8338 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8339 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8340 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8341 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8342 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8343 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8344 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8345 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8346 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8347 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8348 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8349 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8350 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8351 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8352 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8353 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8354 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8355 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8356 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8357 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8358 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8359 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8360 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8361 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8362 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8363 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8364 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8365 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8366 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8367 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8368 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8369 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8370 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8371 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8372 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8373 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8374 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8375 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8376 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8377 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8378 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8379 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8380 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8381 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8382 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8383 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8384 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8385 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8386 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8387 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8388 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8389 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8390 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8391 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8392 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8393 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8394 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8395 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8396 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8397 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8398 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8399 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8400 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8401 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8402 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8403 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8404 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8405 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8406 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8407 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8408 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8409 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8410 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8411 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8412 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8413 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8414 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8415 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8416 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8419 Version 1.8.0 (2016-04-14)
8420 ==========================
8425 * Rust supports overloading of compound assignment statements like
8426 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8427 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8428 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8430 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8431 addition to the non-braced form, `struct Foo;`. [RFC 218].
8437 * [`str::encode_utf16`] (renamed from `utf16_units`)
8438 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8441 * [`ptr::drop_in_place`]
8443 * [`time::SystemTime`]
8445 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8446 * [`Instant::elapsed`]
8447 * [`SystemTime::now`]
8448 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8449 * [`SystemTime::elapsed`]
8450 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8451 * [`SystemTimeError`]
8452 * [`SystemTimeError::duration`]
8453 * Various impls for `SystemTimeError`
8455 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8456 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8457 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8458 * [The `write!` and `writeln!` macros correctly emit errors if any of
8459 their arguments can't be formatted][1.8w].
8460 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8461 * [The Unix-specific `raw` modules, which contain a number of
8462 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8463 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8464 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8465 across platforms was making it difficult to implement `std`
8466 correctly. Those that need these definitions should use the `libc`
8468 * The Unix-specific `MetadataExt` traits, including
8469 `os::unix::fs::MetadataExt`, which expose values such as inode
8470 numbers [no longer return platform-specific types][1.8r], but
8471 instead return widened integers. [RFC 1415].
8472 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8473 * [Atomic loads and stores are not volatile][1.8a].
8474 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8479 * [Inlining hash functions lead to a 3% compile-time improvement in
8480 some workloads][1.8h].
8481 * When using jemalloc, its symbols are [unprefixed so that it
8482 overrides the libc malloc implementation][1.8h]. This means that for
8483 rustc, LLVM is now using jemalloc, which results in a 6%
8484 compile-time improvement on a specific workload.
8485 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8490 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8491 i686-pc-windows-msvc is now considered a tier-1 platform.
8492 * [The `--print targets` flag prints a list of supported targets][1.8t].
8493 * [The `--print cfg` flag prints the `cfg`s defined for the current
8495 * [`rustc` can be built with an new Cargo-based build system, written
8496 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8497 build system. To enable it configure with `configure --rustbuild`.
8498 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8499 variants while also indicating the total number of missing variants
8500 if more than 3][1.8m].
8501 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8502 * The Rust Project now publishes binary releases of the standard
8503 library for a number of tier-2 targets:
8504 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8505 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8506 `x86_64-rumprun-netbsd`. These can be installed with
8507 tools such as [multirust][1.8mr].
8512 * [`cargo init` creates a new Cargo project in the current
8513 directory][1.8ci]. It is otherwise like `cargo new`.
8514 * [Cargo has configuration keys for `-v` and
8515 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8516 `[term]` section of `.cargo/config`.
8517 * [Configuration keys that evaluate to strings or integers can be set
8518 via environment variables][1.8ce]. For example the `build.jobs` key
8519 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8520 precedence over config files.
8521 * [Target-specific dependencies support Rust `cfg` syntax for
8522 describing targets][1.8cfg] so that dependencies for multiple
8523 targets can be specified together. [RFC 1361].
8524 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8525 `RUSTDOC` take precedence over the `build.target-dir`,
8526 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8527 * [The child process tree is killed on Windows when Cargo is
8529 * [The `build.target` configuration value sets the target platform,
8530 like `--target`][1.8ct].
8535 * [Unstable compiler flags have been further restricted][1.8u]. Since
8536 1.0 `-Z` flags have been considered unstable, and other flags that
8537 were considered unstable additionally required passing `-Z
8538 unstable-options` to access. Unlike unstable language and library
8539 features though, these options have been accessible on the stable
8540 release channel. Going forward, *new unstable flags will not be
8541 available on the stable release channel*, and old unstable flags
8542 will warn about their usage. In the future, all unstable flags will
8543 be unavailable on the stable release channel.
8544 * [It is no longer possible to `match` on empty enum variants using
8545 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8546 * The Unix-specific `MetadataExt` traits, including
8547 `os::unix::fs::MetadataExt`, which expose values such as inode
8548 numbers [no longer return platform-specific types][1.8r], but
8549 instead return widened integers. [RFC 1415].
8550 * [Modules sourced from the filesystem cannot appear within arbitrary
8551 blocks, but only within other modules][1.8mf].
8552 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8553 * On Unix, [stack overflow triggers a runtime abort instead of a
8555 * [`Command::spawn` and its equivalents return an error if any of
8556 its command-line arguments contain interior `NUL`s][1.8n].
8557 * [Tuple and unit enum variants from other crates are in the type
8559 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8560 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8561 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8562 instead of `foo.lib`.
8565 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8566 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8567 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8568 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8569 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8570 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8571 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8572 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8573 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8574 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8575 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8576 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8577 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8578 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8579 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8580 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8581 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8582 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8583 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8584 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8585 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8586 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8587 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8588 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8589 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8590 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8591 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8592 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8593 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8594 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8595 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8596 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8597 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8598 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8599 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8600 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8601 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8602 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8603 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8604 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8605 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8606 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8607 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8608 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8609 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8610 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8611 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8612 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8613 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8614 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8615 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8616 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8617 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8618 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8619 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8620 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8621 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8622 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8623 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8624 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8627 Version 1.7.0 (2016-03-03)
8628 ==========================
8635 * [`Path::strip_prefix`] (renamed from relative_from)
8636 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8638 * [`Ipv4Addr::is_loopback`]
8639 * [`Ipv4Addr::is_private`]
8640 * [`Ipv4Addr::is_link_local`]
8641 * [`Ipv4Addr::is_multicast`]
8642 * [`Ipv4Addr::is_broadcast`]
8643 * [`Ipv4Addr::is_documentation`]
8645 * [`Ipv6Addr::is_unspecified`]
8646 * [`Ipv6Addr::is_loopback`]
8647 * [`Ipv6Addr::is_multicast`]
8650 * [`Vec::as_mut_slice`]
8652 * [`String::as_str`]
8653 * [`String::as_mut_str`]
8655 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8657 * `<[T]>::`[`sort_by_key`]
8658 * checked, saturated, and overflowing operations
8659 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8660 * [`i32::saturating_mul`]
8661 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8662 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8663 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8664 * [`u32::saturating_mul`]
8665 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8666 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8667 * and checked, saturated, and overflowing operations for other primitive types
8669 * [`ffi::IntoStringError`]
8670 * [`CString::into_string`]
8671 * [`CString::into_bytes`]
8672 * [`CString::into_bytes_with_nul`]
8673 * `From<CString> for Vec<u8>`
8675 * [`IntoStringError::into_cstring`]
8676 * [`IntoStringError::utf8_error`]
8677 * `Error for IntoStringError`
8679 * [`std::hash::BuildHasher`]
8680 * [`BuildHasher::Hasher`]
8681 * [`BuildHasher::build_hasher`]
8682 * [`std::hash::BuildHasherDefault`]
8683 * [`HashMap::with_hasher`]
8684 * [`HashMap::with_capacity_and_hasher`]
8685 * [`HashSet::with_hasher`]
8686 * [`HashSet::with_capacity_and_hasher`]
8687 * [`std::collections::hash_map::RandomState`]
8688 * [`RandomState::new`]
8689 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8690 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8691 from bytes is faster.
8692 * [The performance of `LineWriter` (and thus `io::stdout`) was
8693 improved by using `memchr` to search for newlines][1.7m].
8694 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8695 `f64` variants were stabilized previously.
8696 * [`BTreeMap` was rewritten to use less memory and improve the performance
8697 of insertion and iteration, the latter by as much as 5x][1.7bm].
8698 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8699 covariant over their contained type][1.7bt].
8700 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8701 over their contained type][1.7ll].
8702 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8704 * [`Any` is implemented for unsized types][1.7a].
8705 * [`Hash` is implemented for `Duration`][1.7h].
8710 * [When running tests with `--test`, rustdoc will pass `--cfg`
8711 arguments to the compiler][1.7dt].
8712 * [The compiler is built with RPATH information by default][1.7rpa].
8713 This means that it will be possible to run `rustc` when installed in
8714 unusual configurations without configuring the dynamic linker search
8716 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8717 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8718 over `LD_LIBRARY_PATH`.
8723 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8724 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8725 * [The `rerun-if-changed` build script directive no longer causes the
8726 build script to incorrectly run twice in certain scenarios][1.7rr].
8731 * Soundness fixes to the interactions between associated types and
8732 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8733 code that violates the new rules. This is a significant change that
8734 is known to break existing code, so it has emitted warnings for the
8735 new error cases since 1.4 to give crate authors time to adapt. The
8736 details of what is changing are subtle; read the RFC for more.
8737 * [Several bugs in the compiler's visibility calculations were
8738 fixed][1.7v]. Since this was found to break significant amounts of
8739 code, the new errors will be emitted as warnings for several release
8740 cycles, under the `private_in_public` lint.
8741 * Defaulted type parameters were accidentally accepted in positions
8742 that were not intended. In this release, [defaulted type parameters
8743 appearing outside of type definitions will generate a
8744 warning][1.7d], which will become an error in future releases.
8745 * [Parsing "." as a float results in an error instead of 0][1.7p].
8746 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8747 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8749 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8750 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8751 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8752 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8753 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8754 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8755 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8756 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8757 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8758 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8759 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8760 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8761 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8762 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8763 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8764 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8765 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8766 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8767 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8768 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8769 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8770 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8771 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8772 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8773 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8774 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8775 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8776 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8777 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8778 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8779 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8780 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8781 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8782 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8783 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8784 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8785 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8786 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8787 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8788 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8789 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8790 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8791 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8792 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8793 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8794 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8795 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8796 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8797 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8798 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8799 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8800 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8801 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8802 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8803 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8804 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8805 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8806 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8807 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8808 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8809 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8810 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8811 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8812 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8813 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8814 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8815 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8816 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8817 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8818 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8819 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8820 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8821 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8822 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8823 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8824 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8825 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8826 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8827 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8830 Version 1.6.0 (2016-01-21)
8831 ==========================
8836 * The `#![no_std]` attribute causes a crate to not be linked to the
8837 standard library, but only the [core library][1.6co], as described
8838 in [RFC 1184]. The core library defines common types and traits but
8839 has no platform dependencies whatsoever, and is the basis for Rust
8840 software in environments that cannot support a full port of the
8841 standard library, such as operating systems. Most of the core
8842 library is now stable.
8848 [`Read::read_exact`],
8849 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8850 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8851 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8852 [`os::unix::fs::DirBuilderExt`],
8853 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8854 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8855 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8856 [`collections::hash_map::Drain`],
8857 [`collections::hash_map::HashMap::drain`],
8858 [`collections::hash_set::Drain`],
8859 [`collections::hash_set::HashSet::drain`],
8860 [`collections::binary_heap::Drain`],
8861 [`collections::binary_heap::BinaryHeap::drain`],
8862 [`Vec::extend_from_slice`] (renamed from `push_all`),
8863 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8864 [`RwLock::into_inner`],
8865 [`Iterator::min_by_key`] (renamed from `min_by`),
8866 [`Iterator::max_by_key`] (renamed from `max_by`).
8867 * The [core library][1.6co] is stable, as are most of its APIs.
8868 * [The `assert_eq!` macro supports arguments that don't implement
8869 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8871 * Several timer functions that take duration in milliseconds [are
8872 deprecated in favor of those that take `Duration`][1.6ms]. These
8873 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8874 `thread::park_timeout_ms`.
8875 * The algorithm by which `Vec` reserves additional elements was
8876 [tweaked to not allocate excessive space][1.6a] while still growing
8878 * `From` conversions are [implemented from integers to floats][1.6f]
8879 in cases where the conversion is lossless. Thus they are not
8880 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8881 or `f64`. They are also not implemented for `isize` and `usize`
8882 because the implementations would be platform-specific. `From` is
8883 also implemented from `f32` to `f64`.
8884 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8885 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8886 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8887 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8889 * Sorting slices that are already sorted [is 50% faster in some
8895 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8896 * Cargo build scripts can specify their dependencies by emitting the
8897 [`rerun-if-changed`][1.6rr] key.
8898 * crates.io will reject publication of crates with dependencies that
8899 have a wildcard version constraint. Crates with wildcard
8900 dependencies were seen to cause a variety of problems, as described
8901 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8903 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8904 release folder. A variety of artifacts that Cargo failed to clean
8905 are now correctly deleted.
8910 * The `unreachable_code` lint [warns when a function call's argument
8912 * The parser indicates [failures that may be caused by
8913 confusingly-similar Unicode characters][1.6uc]
8914 * Certain macro errors [are reported at definition time][1.6m], not
8920 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8921 environment variable when locating crates. This was a pre-cargo
8922 feature for integrating with the package manager that was
8923 accidentally never removed.
8924 * [A number of bugs were fixed in the privacy checker][1.6p] that
8925 could cause previously-accepted code to break.
8926 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8927 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8928 struct pattern syntax (`Foo(..)`) can no longer be used to match
8929 unit structs. This is a warning now, but will become an error in
8930 future releases. Patterns that share the same name as a const are
8932 * A bug was fixed that causes [rustc not to apply default type
8933 parameters][1.6xc] when resolving certain method implementations of
8934 traits defined in other crates.
8936 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8937 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8938 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8939 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8940 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8941 [1.6co]: http://doc.rust-lang.org/core/index.html
8942 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8943 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8944 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8945 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8946 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8947 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8948 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8949 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8950 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8951 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8952 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8953 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8954 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8955 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8956 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8957 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8958 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8959 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8960 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8961 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8962 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8963 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8964 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8965 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8966 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8967 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8968 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8969 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8970 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8971 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8972 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8973 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8974 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8975 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8976 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8977 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8978 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8979 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8980 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8981 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8982 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8985 Version 1.5.0 (2015-12-10)
8986 ==========================
8988 * ~700 changes, numerous bugfixes
8994 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8995 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8996 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8997 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8998 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8999 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9000 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9001 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9002 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9003 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9004 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9005 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9006 [`Path::read_link`], [`Path::symlink_metadata`],
9007 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9008 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9009 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9010 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9011 [`slice::split_first_mut`], [`slice::split_first`],
9012 [`slice::split_last_mut`], [`slice::split_last`],
9013 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9014 [`str::MatchIndices`], [`str::RMatchIndices`],
9015 [`str::match_indices`], [`str::rmatch_indices`],
9016 [`str::slice_mut_unchecked`], [`string::ParseError`].
9017 * Rust applications hosted on crates.io can be installed locally to
9018 `~/.cargo/bin` with the [`cargo install`] command. Among other
9019 things this makes it easier to augment Cargo with new subcommands:
9020 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9021 invoked as `cargo foo`.
9022 * Crates with wildcard (`*`) dependencies will [emit warnings when
9023 published][1.5w]. In 1.6 it will no longer be possible to publish
9024 crates with wildcard dependencies.
9029 * The rules determining when a particular lifetime must outlive
9030 a particular value (known as '[dropck]') have been [modified
9031 to not rely on parametricity][1.5p].
9032 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9033 and `Arc`][1.5a]. Because these smart pointer types implement
9034 `Deref`, this causes breakage in cases where the interior type
9035 contains methods of the same name.
9036 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9037 that they could drop their content. Soundness fix.
9038 * All method invocations are [properly checked][1.5wf1] for
9039 [well-formedness][1.5wf2]. Soundness fix.
9040 * Traits whose supertraits contain `Self` are [not object
9041 safe][1.5o]. Soundness fix.
9042 * Target specifications support a [`no_default_libraries`][1.5nd]
9043 setting that controls whether `-nodefaultlibs` is passed to the
9044 linker, and in turn the `is_like_windows` setting no longer affects
9045 the `-nodefaultlibs` flag.
9046 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9047 * The `#[inline]` and `#[repr]` attributes [can only appear
9048 in valid locations][1.5at].
9049 * Native libraries linked from the local crate are [passed to
9050 the linker before native libraries from upstream crates][1.5nl].
9051 * Two rarely-used attributes, `#[no_debug]` and
9052 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9053 * Negation of unsigned integers, which has been a warning for
9054 several releases, [is now behind a feature gate and will
9055 generate errors][1.5nu].
9056 * The parser accidentally accepted visibility modifiers on
9057 enum variants, a bug [which has been fixed][1.5ev].
9058 * [A bug was fixed that allowed `use` statements to import unstable
9064 * When evaluating expressions at compile-time that are not
9065 compile-time constants (const-evaluating expressions in non-const
9066 contexts), incorrect code such as overlong bitshifts and arithmetic
9067 overflow will [generate a warning instead of an error][1.5ce],
9068 delaying the error until runtime. This will allow the
9069 const-evaluator to be expanded in the future backwards-compatibly.
9070 * The `improper_ctypes` lint [no longer warns about using `isize` and
9071 `usize` in FFI][1.5ict].
9076 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9078 * `Default` is [implemented for mutable slices][1.5d].
9079 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9080 * There are now `From` conversions [between floating point
9081 types][1.5f] where the conversions are lossless.
9082 * There are now `From` conversions [between integer types][1.5i] where
9083 the conversions are lossless.
9084 * [`fs::Metadata` implements `Clone`][1.5fs].
9085 * The `parse` method [accepts a leading "+" when parsing
9087 * [`AsMut` is implemented for `Vec`][1.5am].
9088 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9089 been optimized][1.5cf] and no longer rely on the default impl.
9090 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9091 `unsafe extern "C"` function types now [implement `Clone`,
9092 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9093 `fmt::Debug` for up to 12 arguments][1.5fp].
9094 * [Dropping `Vec`s is much faster in unoptimized builds when the
9095 element types don't implement `Drop`][1.5dv].
9096 * A bug that caused in incorrect behavior when [combining `VecDeque`
9097 with zero-sized types][1.5vdz] was resolved.
9098 * [`PartialOrd` for slices is faster][1.5po].
9103 * [Crate metadata size was reduced by 20%][1.5md].
9104 * [Improvements to code generation reduced the size of libcore by 3.3
9105 MB and rustc's memory usage by 18MB][1.5m].
9106 * [Improvements to deref translation increased performance in
9107 unoptimized builds][1.5dr].
9108 * Various errors in trait resolution [are deduplicated to only be
9109 reported once][1.5te].
9110 * Rust has preliminary [support for rumprun kernels][1.5rr].
9111 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9113 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9114 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9115 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9116 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9117 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9118 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9119 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9120 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9121 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9122 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9123 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9124 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9125 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9126 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9127 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9128 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9129 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9130 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9131 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9132 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9133 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9134 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9135 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9136 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9137 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9138 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9139 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9140 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9141 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9142 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9143 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9144 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9145 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9146 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9147 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9148 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9149 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9150 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9151 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9152 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9153 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9154 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9155 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9156 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9157 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9158 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9159 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9160 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9161 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9162 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9163 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9164 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9165 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9166 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9167 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9168 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9169 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9170 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9171 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9172 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9173 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9174 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9175 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9176 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9177 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9178 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9179 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9180 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9181 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9182 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9183 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9184 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9185 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9186 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9187 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9188 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9189 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9190 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9191 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9192 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9193 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9194 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9195 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9196 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9197 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9198 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9199 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9200 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9201 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9203 Version 1.4.0 (2015-10-29)
9204 ==========================
9206 * ~1200 changes, numerous bugfixes
9211 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9212 GNU) are now supported and recommended for use.
9217 * [Several changes have been made to fix type soundness and improve
9218 the behavior of associated types][sound]. See [RFC 1214]. Although
9219 we have mostly introduced these changes as warnings this release, to
9220 become errors next release, there are still some scenarios that will
9221 see immediate breakage.
9222 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9223 line breaks in addition to `\n`][crlf].
9224 * [Loans of `'static` lifetime extend to the end of a function][stat].
9225 * [`str::parse` no longer introduces avoidable rounding error when
9226 parsing floating point numbers. Together with earlier changes to
9227 float formatting/output, "round trips" like f.to_string().parse()
9228 now preserve the value of f exactly. Additionally, leading plus
9229 signs are now accepted][fp3].
9235 * `use` statements that import multiple items [can now rename
9236 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9237 * [Binops work correctly on fat pointers][binfat].
9238 * `pub extern crate`, which does not behave as expected, [issues a
9239 warning][pec] until a better solution is found.
9244 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9245 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9246 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9247 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9248 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9249 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9250 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9251 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9252 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9253 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9254 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9255 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9256 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9257 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9258 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9259 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9260 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9261 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9263 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9264 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9265 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9266 `f64::from_str_radix`.
9267 * [Reverse-searching strings is faster with the 'two-way'
9269 * [`std::io::copy` allows `?Sized` arguments][cc].
9270 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9271 [override `count`, `nth` and `last` with an *O*(1)
9272 implementation][it].
9273 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9274 * [`IntoRawFd` has been added to the Unix-specific prelude,
9275 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9277 * [`Extend<String>` and `FromIterator<String` are both implemented for
9279 * [`IntoIterator` is implemented for references to `Option` and
9281 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9282 Copy`][ext] as part of [RFC 839]. This will cause type inference
9283 breakage in rare situations.
9284 * [`BinaryHeap` implements `Debug`][bh2].
9285 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9287 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9288 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9289 * [String comparison is faster][faststr].
9290 * `&mut T` where `T: std::fmt::Write` [also implements
9291 `std::fmt::Write`][mutw].
9292 * [A stable regression in `VecDeque::push_back` and other
9293 capacity-altering methods that caused panics for zero-sized types
9295 * [Function pointers implement traits for up to 12 parameters][fp2].
9300 * The compiler [no longer uses the 'morestack' feature to prevent
9301 stack overflow][mm]. Instead it uses guard pages and stack
9302 probes (though stack probes are not yet implemented on any platform
9304 * [The compiler matches traits faster when projections are involved][p].
9305 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9307 * [Cargo now displays useful information about what its doing during
9308 `cargo update`][cu].
9310 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9311 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9312 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9313 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9314 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9315 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9316 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9317 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9318 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9319 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9320 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9321 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9322 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9323 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9324 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9325 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9326 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9327 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9328 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9329 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9330 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9331 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9332 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9333 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9334 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9335 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9336 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9337 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9338 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9339 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9340 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9341 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9342 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9343 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9344 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9345 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9346 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9347 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9348 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9349 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9350 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9351 [bh2]: https://github.com/rust-lang/rust/pull/28156
9352 [binfat]: https://github.com/rust-lang/rust/pull/28270
9353 [bm]: https://github.com/rust-lang/rust/pull/28197
9354 [cc]: https://github.com/rust-lang/rust/pull/27531
9355 [crlf]: https://github.com/rust-lang/rust/pull/28034
9356 [cu]: https://github.com/rust-lang/cargo/pull/1931
9357 [d]: https://github.com/rust-lang/rust/pull/27825
9358 [dep]: https://github.com/rust-lang/rust/pull/28339
9359 [es]: https://github.com/rust-lang/rust/pull/27956
9360 [ext]: https://github.com/rust-lang/rust/pull/28094
9361 [faststr]: https://github.com/rust-lang/rust/pull/28338
9362 [ffi]: https://github.com/rust-lang/rust/pull/28779
9363 [fp]: https://github.com/rust-lang/rust/pull/28268
9364 [fp2]: https://github.com/rust-lang/rust/pull/28560
9365 [fp3]: https://github.com/rust-lang/rust/pull/27307
9366 [i]: https://github.com/rust-lang/rust/pull/27451
9367 [into2]: https://github.com/rust-lang/rust/pull/28039
9368 [it]: https://github.com/rust-lang/rust/pull/27652
9369 [mm]: https://github.com/rust-lang/rust/pull/27338
9370 [mutw]: https://github.com/rust-lang/rust/pull/28368
9371 [sound]: https://github.com/rust-lang/rust/pull/27641
9372 [p]: https://github.com/rust-lang/rust/pull/27866
9373 [pec]: https://github.com/rust-lang/rust/pull/28486
9374 [pr]: https://github.com/rust-lang/rust/pull/27896
9375 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9376 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9377 [s]: https://github.com/rust-lang/rust/pull/27474
9378 [stab]: https://github.com/rust-lang/rust/pull/28339
9379 [stat]: https://github.com/rust-lang/rust/pull/28321
9380 [vd]: https://github.com/rust-lang/rust/pull/28494
9382 Version 1.3.0 (2015-09-17)
9383 ==============================
9385 * ~900 changes, numerous bugfixes
9390 * The [new object lifetime defaults][nold] have been [turned
9391 on][nold2] after a cycle of warnings about the change. Now types
9392 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9393 being interpreted as `&'a Box<Trait+'a>` to `&'a
9394 Box<Trait+'static>`.
9395 * [The Rustonomicon][nom] is a new book in the official documentation
9396 that dives into writing unsafe Rust.
9397 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9398 timekeeping is employed by other std APIs, as well as out-of-tree
9404 * The [new object lifetime defaults][nold] have been [turned
9405 on][nold2] after a cycle of warnings about the change.
9406 * There is a known [regression][lr] in how object lifetime elision is
9407 interpreted, the proper solution for which is undetermined.
9408 * The `#[prelude_import]` attribute, an internal implementation
9409 detail, was accidentally stabilized previously. [It has been put
9410 behind the `prelude_import` feature gate][pi]. This change is
9411 believed to break no existing code.
9412 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9413 [more sane for dynamically sized types][dst3]. Code that relied on
9414 the previous behavior is thought to be broken.
9415 * The `dropck` rules, which checks that destructors can't access
9416 destroyed values, [have been updated][dropck] to match the
9417 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9418 cause some previously-compiling code to no longer build.
9423 * The [new object lifetime defaults][nold] have been [turned
9424 on][nold2] after a cycle of warnings about the change.
9425 * Semicolons may [now follow types and paths in
9426 macros](https://github.com/rust-lang/rust/pull/27000).
9427 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9428 [more sane for dynamically sized types][dst3]. Code that relied on
9429 the previous behavior is not known to exist, and suspected to be
9431 * `'static` variables [may now be recursive][st].
9432 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9433 implementations correctly.
9434 * The `dropck` rules, which checks that destructors can't access
9435 destroyed values, [have been updated][dropck] to match the
9441 * The [`Duration`] API, [has been stabilized][ds], as well as the
9442 `std::time` module, which presently contains only `Duration`.
9443 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9444 * The owned C string, [`CString`], implements [`Borrow`] and the
9445 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9446 these allow C strings to be borrowed and cloned in generic code.
9447 * [`CStr`] implements [`Debug`].
9448 * [`AtomicPtr`] implements [`Debug`].
9449 * [`Error`] trait objects [can be downcast to their concrete types][e]
9450 in many common configurations, using the [`is`], [`downcast`],
9451 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9453 * Searching for substrings now [employs the two-way algorithm][search]
9454 instead of doing a naive search. This gives major speedups to a
9455 number of methods, including [`contains`][sc], [`find`][sf],
9456 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9457 [`ends_with`][sew] are also faster.
9458 * The performance of `PartialEq` for slices is [much faster][ps].
9459 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9460 is overridden and optimized by the implementations for scalars.
9461 * The [`Hasher`] trait now has a number of specialized `write_*`
9462 methods for primitive types, for efficiency.
9463 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9464 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9465 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9466 of [`std::error::Error::cause`][iec] also delegates to the inner
9468 * [`process::Child`][pc] gained the [`id`] method, which returns a
9469 `u32` representing the platform-specific process identifier.
9470 * The [`connect`] method on slices is deprecated, replaced by the new
9471 [`join`] method (note that both of these are on the *unstable*
9472 [`SliceConcatExt`] trait, but through the magic of the prelude are
9473 available to stable code anyway).
9474 * The [`Div`] operator is implemented for [`Wrapping`] types.
9475 * [`DerefMut` is implemented for `String`][dms].
9476 * Performance of SipHash (the default hasher for `HashMap`) is
9477 [better for long data][sh].
9478 * [`AtomicPtr`] implements [`Send`].
9479 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9480 are now [specialized to use uninitialized buffers for increased
9482 * Lifetime parameters of foreign functions [are now resolved
9488 * Rust can now, with some coercion, [produce programs that run on
9489 Windows XP][xp], though XP is not considered a supported platform.
9490 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9491 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9492 recommended for use in 1.3, though should be fully-functional
9493 in the [64-bit 1.4 beta][b14].
9494 * On Fedora-based systems installation will [properly configure the
9495 dynamic linker][fl].
9496 * The compiler gained many new extended error descriptions, which can
9497 be accessed with the `--explain` flag.
9498 * The `dropck` pass, which checks that destructors can't access
9499 destroyed values, [has been rewritten][27261]. This fixes some
9500 soundness holes, and as such will cause some previously-compiling
9501 code to no longer build.
9502 * `rustc` now uses [LLVM to write archive files where possible][ar].
9503 Eventually this will eliminate the compiler's dependency on the ar
9505 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9506 supported FreeBSD on x86_64).
9507 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9508 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9510 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9511 will kill the process instead of leaking][nlp].
9513 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9514 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9515 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9516 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9517 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9518 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9519 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9520 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9521 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9522 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9523 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9524 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9525 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9526 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9527 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9528 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9529 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9530 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9531 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9532 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9533 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9534 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9535 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9536 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9537 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9538 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9539 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9540 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9541 [ar]: https://github.com/rust-lang/rust/pull/26926
9542 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9543 [dms]: https://github.com/rust-lang/rust/pull/26241
9544 [27261]: https://github.com/rust-lang/rust/pull/27261
9545 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9546 [ds]: https://github.com/rust-lang/rust/pull/26818
9547 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9548 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9549 [dst3]: https://github.com/rust-lang/rust/pull/27351
9550 [e]: https://github.com/rust-lang/rust/pull/24793
9551 [f]: https://github.com/rust-lang/rust/pull/26588
9552 [26959]: https://github.com/rust-lang/rust/pull/26959
9553 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9554 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9555 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9556 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9557 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9558 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9559 [lic]: https://github.com/rust-lang/rust/pull/26583
9560 [lnu]: https://github.com/rust-lang/rust/pull/27026
9561 [lr]: https://github.com/rust-lang/rust/issues/27248
9562 [lum]: https://github.com/rust-lang/rust/pull/26378
9563 [lur]: https://github.com/rust-lang/rust/pull/26783
9564 [nlp]: https://github.com/rust-lang/rust/pull/27176
9565 [nold2]: https://github.com/rust-lang/rust/pull/27045
9566 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9567 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9568 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9569 [pi]: https://github.com/rust-lang/rust/pull/26699
9570 [ps]: https://github.com/rust-lang/rust/pull/26884
9571 [rte]: https://github.com/rust-lang/rust/pull/26950
9572 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9573 [search]: https://github.com/rust-lang/rust/pull/26327
9574 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9575 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9576 [sh]: https://github.com/rust-lang/rust/pull/27280
9577 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9578 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9579 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9580 [st]: https://github.com/rust-lang/rust/pull/26630
9581 [win1]: https://github.com/rust-lang/rust/pull/26569
9582 [win2]: https://github.com/rust-lang/rust/pull/26741
9583 [win3]: https://github.com/rust-lang/rust/pull/26741
9584 [win4]: https://github.com/rust-lang/rust/pull/27210
9585 [xp]: https://github.com/rust-lang/rust/pull/26569
9587 Version 1.2.0 (2015-08-07)
9588 ==========================
9590 * ~1200 changes, numerous bugfixes
9595 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9596 like `Rc` to contain types without a fixed size, arrays and trait
9597 objects, finally enabling use of `Rc<[T]>` and completing the
9598 implementation of DST.
9599 * [Parallel codegen][parcodegen] is now working again, which can
9600 substantially speed up large builds in debug mode; It also gets
9601 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9602 jobs). It's not enabled by default, but will be "in the near
9603 future". It can be activated with the `-C codegen-units=N` flag to
9605 * This is the first release with [experimental support for linking
9606 with the MSVC linker and lib C on Windows (instead of using the GNU
9607 variants via MinGW)][win]. It is yet recommended only for the most
9608 intrepid Rustaceans.
9609 * Benchmark compilations are showing a 30% improvement in
9610 bootstrapping over 1.1.
9615 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9616 unicode case mapping, which is a previously-planned change in
9617 behavior and considered a bugfix.
9618 * [`mem::align_of`] now specifies [the *minimum alignment* for
9619 T][align], which is usually the alignment programs are interested
9620 in, and the same value reported by clang's
9621 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9623 * [The `#[packed]` attribute is no longer silently accepted by the
9624 compiler][packed]. This attribute did nothing and code that
9625 mentioned it likely did not work as intended.
9626 * Associated type defaults are [now behind the
9627 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9628 defaults *did not work*, but could be mentioned syntactically. As
9629 such this breakage has minimal impact.
9634 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9635 matching against dereferenceable values.
9640 * The [`Extend`] trait, which grows a collection from an iterator, is
9641 implemented over iterators of references, for `String`, `Vec`,
9642 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9643 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9644 * The [`iter::once`] function returns an iterator that yields a single
9645 element, and [`iter::empty`] returns an iterator that yields no
9647 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9648 over substring matches.
9649 * [`Cell`] and [`RefCell`] both implement `Eq`.
9650 * A number of methods for wrapping arithmetic are added to the
9651 integral types, [`wrapping_div`], [`wrapping_rem`],
9652 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9653 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9654 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9655 type.. It is illegal for the default arithmetic operations in Rust
9656 to overflow; the desire to wrap must be explicit.
9657 * The `{:#?}` formatting specifier [displays the alternate,
9658 pretty-printed][debugfmt] form of the `Debug` formatter. This
9659 feature was actually introduced prior to 1.0 with little
9661 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9662 for writing data to formatted strings, similar to [`io::Write`].
9663 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9664 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9665 are used by code generators to emit implementations of [`Debug`].
9666 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9667 methods that convert case, following Unicode case mapping.
9668 * It is now easier to handle poisoned locks. The [`PoisonError`]
9669 type, returned by failing lock operations, exposes `into_inner`,
9670 `get_ref`, and `get_mut`, which all give access to the inner lock
9671 guard, and allow the poisoned lock to continue to operate. The
9672 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9673 poisoned lock without attempting to take the lock.
9674 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9675 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9676 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9677 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9679 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9685 * `rustc` employs smarter heuristics for guessing at [typos].
9686 * `rustc` emits more efficient code for [no-op conversions between
9687 unsafe pointers][nop].
9688 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9689 resulting in faster compile times and smaller code.
9691 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9692 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9693 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9694 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9695 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9696 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9697 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9698 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9699 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9700 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9701 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9702 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9703 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9704 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9705 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9706 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9707 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9708 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9709 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9710 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9711 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9712 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9713 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9714 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9715 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9716 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9717 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9718 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9719 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9720 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9721 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9722 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9723 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9724 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9725 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9726 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9727 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9728 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9729 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9730 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9731 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9732 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9733 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9734 [align]: https://github.com/rust-lang/rust/pull/25646
9735 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9736 [typos]: https://github.com/rust-lang/rust/pull/26087
9737 [nop]: https://github.com/rust-lang/rust/pull/26336
9738 [fat]: https://github.com/rust-lang/rust/pull/26411
9739 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9740 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9741 [packed]: https://github.com/rust-lang/rust/pull/25541
9742 [ad]: https://github.com/rust-lang/rust/pull/27382
9743 [win]: https://github.com/rust-lang/rust/pull/25350
9745 Version 1.1.0 (2015-06-25)
9746 =========================
9748 * ~850 changes, numerous bugfixes
9753 * The [`std::fs` module has been expanded][fs] to expand the set of
9754 functionality exposed:
9755 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9756 don't incur a syscall on some platforms.
9757 * A `symlink_metadata` function has been added.
9758 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9759 access to all underlying information.
9760 * The compiler now contains extended explanations of many errors. When an error
9761 with an explanation occurs the compiler suggests using the `--explain` flag
9762 to read the explanation. Error explanations are also [available online][err-index].
9763 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9764 well as other work, the time to bootstrap the compiler decreased by
9770 * The [`str::split_whitespace`] method splits a string on unicode
9771 whitespace boundaries.
9772 * On both Windows and Unix, new extension traits provide conversion of
9773 I/O types to and from the underlying system handles. On Unix, these
9774 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9775 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9776 `TcpListener`, and `UpdSocket`. Further implementations for
9777 `std::process` will be stabilized later.
9778 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9779 Windows, symlinks can be created with
9780 `std::os::windows::symlink_dir` and
9781 `std::os::windows::symlink_file`.
9782 * The `mpsc::Receiver` type can now be converted into an iterator with
9783 `into_iter` on the [`IntoIterator`] trait.
9784 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9785 implementation of the [`From`] trait.
9786 * The `Debug` implementation for `RangeFull` [creates output that is
9787 more consistent with other implementations][rf].
9788 * [`Debug` is implemented for `File`][file].
9789 * The `Default` implementation for `Arc` [no longer requires `Sync +
9791 * [The `Iterator` methods `count`, `nth`, and `last` have been
9792 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9793 * Incorrect handling of paths on Windows has been improved in both the
9794 compiler and the standard library.
9795 * [`AtomicPtr` gained a `Default` implementation][ap].
9796 * In accordance with Rust's policy on arithmetic overflow `abs` now
9797 [panics on overflow when debug assertions are enabled][abs].
9798 * The [`Cloned`] iterator, which was accidentally left unstable for
9799 1.0 [has been stabilized][c].
9800 * The [`Incoming`] iterator, which iterates over incoming TCP
9801 connections, and which was accidentally unnamable in 1.0, [is now
9802 properly exported][inc].
9803 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9804 `sift_up` or `sift_down` panic][bh].
9805 * The [`split_off`] method of `LinkedList` [no longer corrupts
9806 the list in certain scenarios][ll].
9811 * Type checking performance [has improved notably][sk] with
9812 [multiple improvements][pre].
9813 * The compiler [suggests code changes][ch] for more errors.
9814 * rustc and it's build system have experimental support for [building
9815 toolchains against MUSL][m] instead of glibc on Linux.
9816 * The compiler defines the `target_env` cfg value, which is used for
9817 distinguishing toolchains that are otherwise for the same
9818 platform. Presently this is set to `gnu` for common GNU Linux
9819 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9820 * The [`cargo rustc`][crc] command invokes a build with custom flags
9822 * [Android executables are always position independent][pie].
9823 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9824 with `Drop`][24935].
9826 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9827 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9828 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9829 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9830 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9831 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9832 [rf]: https://github.com/rust-lang/rust/pull/24491
9833 [err-index]: https://doc.rust-lang.org/error-index.html
9834 [sk]: https://github.com/rust-lang/rust/pull/24615
9835 [pre]: https://github.com/rust-lang/rust/pull/25323
9836 [file]: https://github.com/rust-lang/rust/pull/24598
9837 [ch]: https://github.com/rust-lang/rust/pull/24683
9838 [arc]: https://github.com/rust-lang/rust/pull/24695
9839 [si]: https://github.com/rust-lang/rust/pull/24701
9840 [ap]: https://github.com/rust-lang/rust/pull/24834
9841 [m]: https://github.com/rust-lang/rust/pull/24777
9842 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9843 [crc]: https://github.com/rust-lang/cargo/pull/1568
9844 [pie]: https://github.com/rust-lang/rust/pull/24953
9845 [abs]: https://github.com/rust-lang/rust/pull/25441
9846 [c]: https://github.com/rust-lang/rust/pull/25496
9847 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9848 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9849 [inc]: https://github.com/rust-lang/rust/pull/25522
9850 [bh]: https://github.com/rust-lang/rust/pull/25856
9851 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9852 [ll]: https://github.com/rust-lang/rust/pull/26022
9853 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9854 [24935]: https://github.com/rust-lang/rust/pull/24935
9856 Version 1.0.0 (2015-05-15)
9857 ========================
9859 * ~1500 changes, numerous bugfixes
9864 * The vast majority of the standard library is now `#[stable]`. It is
9865 no longer possible to use unstable features with a stable build of
9867 * Many popular crates on [crates.io] now work on the stable release
9869 * Arithmetic on basic integer types now [checks for overflow in debug
9875 * Several [restrictions have been added to trait coherence][coh] in
9876 order to make it easier for upstream authors to change traits
9877 without breaking downstream code.
9878 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9879 improve error messages and macro behavior. For example, `0b1234` is
9880 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9881 * Trait bounds [are always invariant][inv], eliminating the need for
9882 the `PhantomFn` and `MarkerTrait` lang items, which have been
9884 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9885 "foo" as bar` syntax has been replaced with `extern crate foo as
9886 bar`, and Cargo now automatically translates "-" in *package* names
9887 to underscore for the crate name.
9888 * [Lifetime shadowing is an error][lt].
9889 * [`Send` no longer implies `'static`][send-rfc].
9890 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9891 `MyType::default()`.
9892 * Primitive types [now have inherent methods][prim-inherent],
9893 obviating the need for extension traits like `SliceExt`.
9894 * Methods with `Self: Sized` in their `where` clause are [considered
9895 object-safe][self-sized], allowing many extension traits like
9896 `IteratorExt` to be merged into the traits they extended.
9897 * You can now [refer to associated types][assoc-where] whose
9898 corresponding trait bounds appear only in a `where` clause.
9899 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9900 like `Send` and `Sync` are now library-defined.
9901 * A [Reflect trait][reflect] was introduced, which means that
9902 downcasting via the `Any` trait is effectively limited to concrete
9903 types. This helps retain the potentially-important "parametricity"
9904 property: generic code cannot behave differently for different type
9905 arguments except in minor ways.
9906 * The `unsafe_destructor` feature is now deprecated in favor of the
9907 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9913 * The `thread_local` module [has been renamed to `std::thread`][th].
9914 * The methods of `IteratorExt` [have been moved to the `Iterator`
9915 trait itself][23300].
9916 * Several traits that implement Rust's conventions for type
9917 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9918 [centralized in the `std::convert` module][con].
9919 * The `FromError` trait [was removed in favor of `From`][fe].
9920 * The basic sleep function [has moved to
9921 `std::thread::sleep_ms`][slp].
9922 * The `splitn` function now takes an `n` parameter that represents the
9923 number of items yielded by the returned iterator [instead of the
9924 number of 'splits'][spl].
9925 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9926 * [Derived implementations of `PartialOrd` now order enums according
9927 to their explicitly-assigned discriminants][po].
9928 * [Methods for searching strings are generic over `Pattern`s][pat],
9929 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9931 * [In method resolution, object methods are resolved before inherent
9933 * [`String::from_str` has been deprecated in favor of the `From` impl,
9934 `String::from`][24517].
9935 * [`io::Error` implements `Sync`][ios].
9936 * [The `words` method on `&str` has been replaced with
9937 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9939 * The new path and IO modules are complete and `#[stable]`. This
9940 was the major library focus for this cycle.
9941 * The path API was [revised][path-normalize] to normalize `.`,
9942 adjusting the tradeoffs in favor of the most common usage.
9943 * A large number of remaining APIs in `std` were also stabilized
9944 during this cycle; about 75% of the non-deprecated API surface
9946 * The new [string pattern API][string-pattern] landed, which makes
9947 the string slice API much more internally consistent and flexible.
9948 * A new set of [generic conversion traits][conversion] replaced
9949 many existing ad hoc traits.
9950 * Generic numeric traits were [completely removed][num-traits]. This
9951 was made possible thanks to inherent methods for primitive types,
9952 and the removal gives maximal flexibility for designing a numeric
9953 hierarchy in the future.
9954 * The `Fn` traits are now related via [inheritance][fn-inherit]
9955 and provide ergonomic [blanket implementations][fn-blanket].
9956 * The `Index` and `IndexMut` traits were changed to
9957 [take the index by value][index-value], enabling code like
9958 `hash_map["string"]` to work.
9959 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9960 `Copy` data is known to be `Clone` as well.
9965 * Many errors now have extended explanations that can be accessed with
9966 the `--explain` flag to `rustc`.
9967 * Many new examples have been added to the standard library
9969 * rustdoc has received a number of improvements focused on completion
9971 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9972 * Much headway was made on ecosystem-wide CI, making it possible
9973 to [compare builds for breakage][ci-compare].
9976 [crates.io]: http://crates.io
9977 [clo]: https://github.com/rust-lang/rust/pull/24034
9978 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9979 [con]: https://github.com/rust-lang/rust/pull/23875
9980 [cr]: https://github.com/rust-lang/rust/pull/23419
9981 [fe]: https://github.com/rust-lang/rust/pull/23879
9982 [23300]: https://github.com/rust-lang/rust/pull/23300
9983 [inv]: https://github.com/rust-lang/rust/pull/23938
9984 [ios]: https://github.com/rust-lang/rust/pull/24133
9985 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9986 [lt]: https://github.com/rust-lang/rust/pull/24057
9987 [meth]: https://github.com/rust-lang/rust/pull/24056
9988 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9989 [po]: https://github.com/rust-lang/rust/pull/24270
9990 [24517]: https://github.com/rust-lang/rust/pull/24517
9991 [slp]: https://github.com/rust-lang/rust/pull/23949
9992 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9993 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9994 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9995 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9996 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9997 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9998 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9999 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10000 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10001 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10002 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10003 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10004 [reflect]: https://github.com/rust-lang/rust/pull/23712
10005 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10006 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10007 [index-value]: https://github.com/rust-lang/rust/pull/23601
10008 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10009 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10010 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10011 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10012 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10013 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10016 Version 1.0.0-alpha.2 (2015-02-20)
10017 =====================================
10019 * ~1300 changes, numerous bugfixes
10023 * The various I/O modules were [overhauled][io-rfc] to reduce
10024 unnecessary abstractions and provide better interoperation with
10025 the underlying platform. The old `io` module remains temporarily
10027 * The standard library now [participates in feature gating][feat],
10028 so use of unstable libraries now requires a `#![feature(...)]`
10029 attribute. The impact of this change is [described on the
10030 forum][feat-forum]. [RFC][feat-rfc].
10034 * `for` loops [now operate on the `IntoIterator` trait][into],
10035 which eliminates the need to call `.iter()`, etc. to iterate
10036 over collections. There are some new subtleties to remember
10037 though regarding what sort of iterators various types yield, in
10038 particular that `for foo in bar { }` yields values from a move
10039 iterator, destroying the original collection. [RFC][into-rfc].
10040 * Objects now have [default lifetime bounds][obj], so you don't
10041 have to write `Box<Trait+'static>` when you don't care about
10042 storing references. [RFC][obj-rfc].
10043 * In types that implement `Drop`, [lifetimes must outlive the
10044 value][drop]. This will soon make it possible to safely
10045 implement `Drop` for types where `#[unsafe_destructor]` is now
10046 required. Read the [gorgeous RFC][drop-rfc] for details.
10047 * The fully qualified <T as Trait>::X syntax lets you set the Self
10048 type for a trait method or associated type. [RFC][ufcs-rfc].
10049 * References to types that implement `Deref<U>` now [automatically
10050 coerce to references][deref] to the dereferenced type `U`,
10051 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10052 should eliminate many unsightly uses of `&*`, as when converting
10053 from references to vectors into references to
10054 slices. [RFC][deref-rfc].
10055 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10056 `|:|`) is obsolete and closure kind is inferred from context.
10057 * [`Self` is a keyword][Self].
10061 * The `Show` and `String` formatting traits [have been
10062 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10063 their related purposes. Automatically getting a string
10064 conversion to use with `format!("{:?}", something_to_debug)` is
10065 now written `#[derive(Debug)]`.
10066 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10067 OsStr}`, provide strings in platform-specific encodings for easier
10068 interop with system APIs. [RFC][osstr-rfc].
10069 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10070 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10071 creating raw pointers.
10075 * Certain long error messages of the form 'expected foo found bar'
10076 are now [split neatly across multiple
10077 lines][multiline]. Examples in the PR.
10078 * On Unix Rust can be [uninstalled][un] by running
10079 `/usr/local/lib/rustlib/uninstall.sh`.
10080 * The `#[rustc_on_unimplemented]` attribute, requiring the
10081 'on_unimplemented' feature, lets rustc [display custom error
10082 messages when a trait is expected to be implemented for a type
10087 * Rust is tested against a [LALR grammar][lalr], which parses
10088 almost all the Rust files that rustc does.
10090 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10091 [close]: https://github.com/rust-lang/rust/pull/21843
10092 [deref]: https://github.com/rust-lang/rust/pull/21351
10093 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10094 [drop]: https://github.com/rust-lang/rust/pull/21972
10095 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10096 [feat]: https://github.com/rust-lang/rust/pull/21248
10097 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10098 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10099 [fmt]: https://github.com/rust-lang/rust/pull/21457
10100 [into]: https://github.com/rust-lang/rust/pull/20790
10101 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10102 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10103 [lalr]: https://github.com/rust-lang/rust/pull/21452
10104 [multiline]: https://github.com/rust-lang/rust/pull/19870
10105 [obj]: https://github.com/rust-lang/rust/pull/22230
10106 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10107 [onun]: https://github.com/rust-lang/rust/pull/20889
10108 [osstr]: https://github.com/rust-lang/rust/pull/21488
10109 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10110 [Self]: https://github.com/rust-lang/rust/pull/22158
10111 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10112 [un]: https://github.com/rust-lang/rust/pull/22256
10115 Version 1.0.0-alpha (2015-01-09)
10116 ==================================
10118 * ~2400 changes, numerous bugfixes
10122 * The language itself is considered feature complete for 1.0,
10123 though there will be many usability improvements and bugfixes
10124 before the final release.
10125 * Nearly 50% of the public API surface of the standard library has
10126 been declared 'stable'. Those interfaces are unlikely to change
10128 * The long-running debate over integer types has been
10129 [settled][ints]: Rust will ship with types named `isize` and
10130 `usize`, rather than `int` and `uint`, for pointer-sized
10131 integers. Guidelines will be rolled out during the alpha cycle.
10132 * Most crates that are not `std` have been moved out of the Rust
10133 distribution into the Cargo ecosystem so they can evolve
10134 separately and don't need to be stabilized as quickly, including
10135 'time', 'getopts', 'num', 'regex', and 'term'.
10136 * Documentation continues to be expanded with more API coverage, more
10137 examples, and more in-depth explanations. The guides have been
10138 consolidated into [The Rust Programming Language][trpl].
10139 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10140 * All official Rust binary installers now come with [Cargo], the
10141 Rust package manager.
10145 * Closures have been [completely redesigned][unboxed] to be
10146 implemented in terms of traits, can now be used as generic type
10147 bounds and thus monomorphized and inlined, or via an opaque
10148 pointer (boxed) as in the old system. The new system is often
10149 referred to as 'unboxed' closures.
10150 * Traits now support [associated types][assoc], allowing families
10151 of related types to be defined together and used generically in
10153 * Enum variants are [namespaced by their type names][enum].
10154 * [`where` clauses][where] provide a more versatile and attractive
10155 syntax for specifying generic bounds, though the previous syntax
10157 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10159 * Rust [no longer has a runtime][rt] of any description, and only
10160 supports OS threads, not green threads.
10161 * At long last, Rust has been overhauled for 'dynamically-sized
10162 types' ([DST]), which integrates 'fat pointers' (object types,
10163 arrays, and `str`) more deeply into the type system, making it
10165 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10166 `..j` that produce range types and which, when combined with the
10167 `Index` operator and multidispatch, leads to a convenient slice
10168 notation, `[i..j]`.
10169 * The new range syntax revealed an ambiguity in the fixed-length
10170 array syntax, so now fixed length arrays [are written `[T;
10172 * The `Copy` trait is no longer implemented automatically. Unsafe
10173 pointers no longer implement `Sync` and `Send` so types
10174 containing them don't automatically either. `Sync` and `Send`
10175 are now 'unsafe traits' so one can "forcibly" implement them via
10176 `unsafe impl` if a type confirms to the requirements for them
10177 even though the internals do not (e.g. structs containing unsafe
10178 pointers like `Arc`). These changes are intended to prevent some
10179 footguns and are collectively known as [opt-in built-in
10180 traits][oibit] (though `Sync` and `Send` will soon become pure
10181 library types unknown to the compiler).
10182 * Operator traits now take their operands [by value][ops], and
10183 comparison traits can use multidispatch to compare one type
10184 against multiple other types, allowing e.g. `String` to be
10185 compared with `&str`.
10186 * `if let` and `while let` are no longer feature-gated.
10187 * Rust has adopted a more [uniform syntax for escaping unicode
10188 characters][unicode].
10189 * `macro_rules!` [has been declared stable][mac]. Though it is a
10190 flawed system it is sufficiently popular that it must be usable
10191 for 1.0. Effort has gone into [future-proofing][mac-future] it
10192 in ways that will allow other macro systems to be developed in
10193 parallel, and won't otherwise impact the evolution of the
10195 * The prelude has been [pared back significantly][prelude] such
10196 that it is the minimum necessary to support the most pervasive
10197 code patterns, and through [generalized where clauses][where]
10198 many of the prelude extension traits have been consolidated.
10199 * Rust's rudimentary reflection [has been removed][refl], as it
10200 incurred too much code generation for little benefit.
10201 * [Struct variants][structvars] are no longer feature-gated.
10202 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10203 known as 'higher-ranked trait bounds', this crucially allows
10204 unboxed closures to work.
10205 * Macros invocations surrounded by parens or square brackets and
10206 not terminated by a semicolon are [parsed as
10207 expressions][macros], which makes expressions like `vec![1i32,
10208 2, 3].len()` work as expected.
10209 * Trait objects now implement their traits automatically, and
10210 traits that can be coerced to objects now must be [object
10212 * Automatically deriving traits is now done with `#[derive(...)]`
10213 not `#[deriving(...)]` for [consistency with other naming
10214 conventions][derive].
10215 * Importing the containing module or enum at the same time as
10216 items or variants they contain is [now done with `self` instead
10217 of `mod`][self], as in use `foo::{self, bar}`
10218 * Glob imports are no longer feature-gated.
10219 * The `box` operator and `box` patterns have been feature-gated
10220 pending a redesign. For now unique boxes should be allocated
10221 like other containers, with `Box::new`.
10225 * A [series][coll1] of [efforts][coll2] to establish
10226 [conventions][coll3] for collections types has resulted in API
10227 improvements throughout the standard library.
10228 * New [APIs for error handling][err] provide ergonomic interop
10229 between error types, and [new conventions][err-conv] describe
10230 more clearly the recommended error handling strategies in Rust.
10231 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10232 it is easier to discuss failure in the context of error handling
10233 without making clarifications as to whether you are referring to
10234 the 'fail' macro or failure more generally.
10235 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10236 syscall when available.
10237 * The 'serialize' crate has been renamed 'rustc-serialize' and
10238 moved out of the distribution to Cargo. Although it is widely
10239 used now, it is expected to be superseded in the near future.
10240 * The `Show` formatter, typically implemented with
10241 `#[derive(Show)]` is [now requested with the `{:?}`
10242 specifier][show] and is intended for use by all types, for uses
10243 such as `println!` debugging. The new `String` formatter must be
10244 implemented by hand, uses the `{}` specifier, and is intended
10245 for full-fidelity conversions of things that can logically be
10246 represented as strings.
10250 * [Flexible target specification][flex] allows rustc's code
10251 generation to be configured to support otherwise-unsupported
10253 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10254 respective debuggers with Rust-appropriate pretty-printing.
10255 * The Windows installation of Rust is distributed with the
10256 MinGW components currently required to link binaries on that
10261 * Nullable enum optimizations have been extended to more types so
10262 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10263 space than the inner types themselves.
10264 * Work has begun on supporting AArch64.
10266 [Cargo]: https://crates.io
10267 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10268 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10269 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10270 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10271 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10272 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10273 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10274 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10275 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10276 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10277 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10278 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10279 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10280 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10281 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10282 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10283 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10284 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10285 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10286 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10287 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10288 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10289 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10290 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10291 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10292 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10293 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10294 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10295 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10296 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10297 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10298 [trpl]: https://doc.rust-lang.org/book/index.html
10299 [rbe]: http://rustbyexample.com/
10302 Version 0.12.0 (2014-10-09)
10303 =============================
10305 * ~1900 changes, numerous bugfixes
10309 * The introductory documentation (now called The Rust Guide) has
10310 been completely rewritten, as have a number of supplementary
10312 * Rust's package manager, Cargo, continues to improve and is
10313 sometimes considered to be quite awesome.
10314 * Many API's in `std` have been reviewed and updated for
10315 consistency with the in-development Rust coding
10316 guidelines. The standard library documentation tracks
10317 stabilization progress.
10318 * Minor libraries have been moved out-of-tree to the rust-lang org
10319 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10320 be installed with Cargo.
10321 * Lifetime elision allows lifetime annotations to be left off of
10322 function declarations in many common scenarios.
10323 * Rust now works on 64-bit Windows.
10326 * Indexing can be overloaded with the `Index` and `IndexMut`
10328 * The `if let` construct takes a branch only if the `let` pattern
10329 matches, currently behind the 'if_let' feature gate.
10330 * 'where clauses', a more flexible syntax for specifying trait
10331 bounds that is more aesthetic, have been added for traits and
10332 free functions. Where clauses will in the future make it
10333 possible to constrain associated types, which would be
10334 impossible with the existing syntax.
10335 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10336 the 'slicing_syntax' feature gate, and can be overloaded with
10337 the `Slice` or `SliceMut` traits.
10338 * The syntax for matching of sub-slices has been changed to use a
10339 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10340 consistency with other uses of `..` and to future-proof
10341 potential additional uses of the syntax.
10342 * The syntax for matching inclusive ranges in patterns has changed
10343 from `0..3` to `0...4` to be consistent with the exclusive range
10344 syntax for slicing.
10345 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10346 c]`) has been put behind the 'advanced_slice_patterns' feature
10347 gate and may be removed in the future.
10348 * Components of tuples and tuple structs can be extracted using
10349 the `value.0` syntax, currently behind the `tuple_indexing`
10351 * The `#[crate_id]` attribute is no longer supported; versioning
10352 is handled by the package manager.
10353 * Renaming crate imports are now written `extern crate foo as bar`
10354 instead of `extern crate bar = foo`.
10355 * Renaming use statements are now written `use foo as bar` instead
10356 of `use bar = foo`.
10357 * `let` and `match` bindings and argument names in macros are now
10359 * The new, more efficient, closure types ('unboxed closures') have
10360 been added under a feature gate, 'unboxed_closures'. These will
10361 soon replace the existing closure types, once higher-ranked
10362 trait lifetimes are added to the language.
10363 * `move` has been added as a keyword, for indicating closures
10364 that capture by value.
10365 * Mutation and assignment is no longer allowed in pattern guards.
10366 * Generic structs and enums can now have trait bounds.
10367 * The `Share` trait is now called `Sync` to free up the term
10368 'shared' to refer to 'shared reference' (the default reference
10370 * Dynamically-sized types have been mostly implemented,
10371 unifying the behavior of fat-pointer types with the rest of the
10373 * As part of dynamically-sized types, the `Sized` trait has been
10374 introduced, which qualifying types implement by default, and
10375 which type parameters expect by default. To specify that a type
10376 parameter does not need to be sized, write `<Sized? T>`. Most
10377 types are `Sized`, notable exceptions being unsized arrays
10378 (`[T]`) and trait types.
10379 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10380 * Lifetime bounds can now be applied to type parameters and object
10382 * The old, reference counted GC type, `Gc<T>` which was once
10383 denoted by the `@` sigil, has finally been removed. GC will be
10384 revisited in the future.
10387 * Library documentation has been improved for a number of modules.
10388 * Bit-vectors, collections::bitv has been modernized.
10389 * The url crate is deprecated in favor of
10390 http://github.com/servo/rust-url, which can be installed with
10392 * Most I/O stream types can be cloned and subsequently closed from
10393 a different thread.
10394 * A `std::time::Duration` type has been added for use in I/O
10395 methods that rely on timers, as well as in the 'time' crate's
10396 `Timespec` arithmetic.
10397 * The runtime I/O abstraction layer that enabled the green thread
10398 scheduler to do non-thread-blocking I/O has been removed, along
10399 with the libuv-based implementation employed by the green thread
10400 scheduler. This will greatly simplify the future I/O work.
10401 * `collections::btree` has been rewritten to have a more
10402 idiomatic and efficient design.
10405 * rustdoc output now indicates the stability levels of API's.
10406 * The `--crate-name` flag can specify the name of the crate
10407 being compiled, like `#[crate_name]`.
10408 * The `-C metadata` specifies additional metadata to hash into
10409 symbol names, and `-C extra-filename` specifies additional
10410 information to put into the output filename, for use by the
10411 package manager for versioning.
10412 * debug info generation has continued to improve and should be
10413 more reliable under both gdb and lldb.
10414 * rustc has experimental support for compiling in parallel
10415 using the `-C codegen-units` flag.
10416 * rustc no longer encodes rpath information into binaries by
10420 * Stack usage has been optimized with LLVM lifetime annotations.
10421 * Official Rust binaries on Linux are more compatible with older
10422 kernels and distributions, built on CentOS 5.10.
10425 Version 0.11.0 (2014-07-02)
10426 ==========================
10428 * ~1700 changes, numerous bugfixes
10431 * ~[T] has been removed from the language. This type is superseded by
10433 * ~str has been removed from the language. This type is superseded by
10435 * ~T has been removed from the language. This type is superseded by the
10437 * @T has been removed from the language. This type is superseded by the
10438 standard library's std::gc::Gc<T> type.
10439 * Struct fields are now all private by default.
10440 * Vector indices and shift amounts are both required to be a `uint`
10441 instead of any integral type.
10442 * Byte character, byte string, and raw byte string literals are now all
10443 supported by prefixing the normal literal with a `b`.
10444 * Multiple ABIs are no longer allowed in an ABI string
10445 * The syntax for lifetimes on closures/procedures has been tweaked
10446 slightly: `<'a>|A, B|: 'b + K -> T`
10447 * Floating point modulus has been removed from the language; however it
10448 is still provided by a library implementation.
10449 * Private enum variants are now disallowed.
10450 * The `priv` keyword has been removed from the language.
10451 * A closure can no longer be invoked through a &-pointer.
10452 * The `use foo, bar, baz;` syntax has been removed from the language.
10453 * The transmute intrinsic no longer works on type parameters.
10454 * Statics now allow blocks/items in their definition.
10455 * Trait bounds are separated from objects with + instead of : now.
10456 * Objects can no longer be read while they are mutably borrowed.
10457 * The address of a static is now marked as insignificant unless the
10458 #[inline(never)] attribute is placed it.
10459 * The #[unsafe_destructor] attribute is now behind a feature gate.
10460 * Struct literals are no longer allowed in ambiguous positions such as
10461 if, while, match, and for..in.
10462 * Declaration of lang items and intrinsics are now feature-gated by
10464 * Integral literals no longer default to `int`, and floating point
10465 literals no longer default to `f64`. Literals must be suffixed with an
10466 appropriate type if inference cannot determine the type of the
10468 * The Box<T> type is no longer implicitly borrowed to &mut T.
10469 * Procedures are now required to not capture borrowed references.
10472 * The standard library is now a "facade" over a number of underlying
10473 libraries. This means that development on the standard library should
10474 be speedier due to smaller crates, as well as a clearer line between
10476 * A new library, libcore, lives under the standard library's facade
10477 which is Rust's "0-assumption" library, suitable for embedded and
10478 kernel development for example.
10479 * A regex crate has been added to the standard distribution. This crate
10480 includes statically compiled regular expressions.
10481 * The unwrap/unwrap_err methods on Result require a Show bound for
10482 better error messages.
10483 * The return types of the std::comm primitives have been centralized
10484 around the Result type.
10485 * A number of I/O primitives have gained the ability to time out their
10487 * A number of I/O primitives have gained the ability to close their
10488 reading/writing halves to cancel pending operations.
10489 * Reverse iterator methods have been removed in favor of `rev()` on
10490 their forward-iteration counterparts.
10491 * A bitflags! macro has been added to enable easy interop with C and
10492 management of bit flags.
10493 * A debug_assert! macro is now provided which is disabled when
10494 `--cfg ndebug` is passed to the compiler.
10495 * A graphviz crate has been added for creating .dot files.
10496 * The std::cast module has been migrated into std::mem.
10497 * The std::local_data api has been migrated from freestanding functions
10498 to being based on methods.
10499 * The Pod trait has been renamed to Copy.
10500 * jemalloc has been added as the default allocator for types.
10501 * The API for allocating memory has been changed to use proper alignment
10502 and sized deallocation
10503 * Connecting a TcpStream or binding a TcpListener is now based on a
10504 string address and a u16 port. This allows connecting to a hostname as
10506 * The Reader trait now contains a core method, read_at_least(), which
10507 correctly handles many repeated 0-length reads.
10508 * The process-spawning API is now centered around a builder-style
10510 * The :? printing qualifier has been moved from the standard library to
10511 an external libdebug crate.
10512 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10513 have been renamed to Eq/Ord.
10514 * The select/plural methods have been removed from format!. The escapes
10515 for { and } have also changed from \{ and \} to {{ and }},
10517 * The TaskBuilder API has been re-worked to be a true builder, and
10518 extension traits for spawning native/green tasks have been added.
10521 * All breaking changes to the language or libraries now have their
10522 commit message annotated with `[breaking-change]` to allow for easy
10523 discovery of breaking changes.
10524 * The compiler will now try to suggest how to annotate lifetimes if a
10525 lifetime-related error occurs.
10526 * Debug info continues to be improved greatly with general bug fixes and
10527 better support for situations like link time optimization (LTO).
10528 * Usage of syntax extensions when cross-compiling has been fixed.
10529 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10530 -fdata-sections and --gc-sections has been enabled by default
10531 * The compiler is now stricter about where it will load module files
10532 from when a module is declared via `mod foo;`.
10533 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10534 Syntax extensions are now discovered via a "plugin registrar" type
10535 which will be extended in the future to other various plugins.
10536 * Lints have been restructured to allow for dynamically loadable lints.
10537 * A number of rustdoc improvements:
10538 * The HTML output has been visually redesigned.
10539 * Markdown is now powered by hoedown instead of sundown.
10540 * Searching heuristics have been greatly improved.
10541 * The search index has been reduced in size by a great amount.
10542 * Cross-crate documentation via `pub use` has been greatly improved.
10543 * Primitive types are now hyperlinked and documented.
10544 * Documentation has been moved from static.rust-lang.org/doc to
10546 * A new sandbox, play.rust-lang.org, is available for running and
10547 sharing rust code examples on-line.
10548 * Unused attributes are now more robustly warned about.
10549 * The dead_code lint now warns about unused struct fields.
10550 * Cross-compiling to iOS is now supported.
10551 * Cross-compiling to mipsel is now supported.
10552 * Stability attributes are now inherited by default and no longer apply
10553 to intra-crate usage, only inter-crate usage.
10554 * Error message related to non-exhaustive match expressions have been
10558 Version 0.10 (2014-04-03)
10559 =========================
10561 * ~1500 changes, numerous bugfixes
10564 * A new RFC process is now in place for modifying the language.
10565 * Patterns with `@`-pointers have been removed from the language.
10566 * Patterns with unique vectors (`~[T]`) have been removed from the
10568 * Patterns with unique strings (`~str`) have been removed from the
10570 * `@str` has been removed from the language.
10571 * `@[T]` has been removed from the language.
10572 * `@self` has been removed from the language.
10573 * `@Trait` has been removed from the language.
10574 * Headers on `~` allocations which contain `@` boxes inside the type for
10575 reference counting have been removed.
10576 * The semantics around the lifetimes of temporary expressions have changed,
10577 see #3511 and #11585 for more information.
10578 * Cross-crate syntax extensions are now possible, but feature gated. See
10579 #11151 for more information. This includes both `macro_rules!` macros as
10580 well as syntax extensions such as `format!`.
10581 * New lint modes have been added, and older ones have been turned on to be
10583 * Unnecessary parentheses
10584 * Uppercase statics
10586 * Uppercase variables
10587 * Publicly visible private types
10588 * `#[deriving]` with raw pointers
10589 * Unsafe functions can no longer be coerced to closures.
10590 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10591 * The `#[simd]` attribute is now behind a feature gate.
10592 * Visibility is no longer allowed on `extern crate` statements, and
10593 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10594 * Trailing commas are now allowed in argument lists and tuple patterns.
10595 * The `do` keyword has been removed, it is now a reserved keyword.
10596 * Default type parameters have been implemented, but are feature gated.
10597 * Borrowed variables through captures in closures are now considered soundly.
10598 * `extern mod` is now `extern crate`
10599 * The `Freeze` trait has been removed.
10600 * The `Share` trait has been added for types that can be shared among
10602 * Labels in macros are now hygienic.
10603 * Expression/statement macro invocations can be delimited with `{}` now.
10604 * Treatment of types allowed in `static mut` locations has been tweaked.
10605 * The `*` and `.` operators are now overloadable through the `Deref` and
10607 * `~Trait` and `proc` no longer have `Send` bounds by default.
10608 * Partial type hints are now supported with the `_` type marker.
10609 * An `Unsafe` type was introduced for interior mutability. It is now
10610 considered undefined to transmute from `&T` to `&mut T` without using the
10612 * The #[linkage] attribute was implemented for extern statics/functions.
10613 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10614 * `Pod` was renamed to `Copy`.
10617 * The `libextra` library has been removed. It has now been decomposed into
10618 component libraries with smaller and more focused nuggets of
10619 functionality. The full list of libraries can be found on the
10620 documentation index page.
10621 * std: `std::condition` has been removed. All I/O errors are now propagated
10622 through the `Result` type. In order to assist with error handling, a
10623 `try!` macro for unwrapping errors with an early return and a lint for
10624 unused results has been added. See #12039 for more information.
10625 * std: The `vec` module has been renamed to `slice`.
10626 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10627 This will become the only growable vector in the future.
10628 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10629 are now found at `std::io::BufferedReader` instead of
10630 `std::io::buffered::BufferedReader`.
10631 * std: `print` and `println` are no longer in the prelude, the `print!` and
10632 `println!` macros are intended to be used instead.
10633 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10634 attempts to statically prevent cycles.
10635 * std: The standard distribution is adopting the policy of pushing failure
10636 to the user rather than failing in libraries. Many functions (such as
10637 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10638 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10639 deriving mode: `#[deriving(Show)]`.
10640 * std: `ToStr` is now implemented for all types implementing `Show`.
10641 * std: The formatting trait methods now take `&self` instead of `&T`
10642 * std: The `invert()` method on iterators has been renamed to `rev()`
10643 * std: `std::num` has seen a reduction in the genericity of its traits,
10644 consolidating functionality into a few core traits.
10645 * std: Backtraces are now printed on task failure if the environment
10646 variable `RUST_BACKTRACE` is present.
10647 * std: Naming conventions for iterators have been standardized. More details
10648 can be found on the wiki's style guide.
10649 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10650 still implement the function.
10651 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10652 * std: `assert_approx_eq!` has been removed
10653 * std: The `e` and `E` formatting specifiers for floats have been added to
10654 print them in exponential notation.
10655 * std: The `Times` trait has been removed
10656 * std: Indications of variance and opting out of builtin bounds is done
10657 through marker types in `std::kinds::marker` now
10658 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10659 `#[deriving(Hash)]` is now possible.
10660 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10661 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10662 * std: `Chan::new` is now `channel()`.
10663 * std: A new synchronous channel type has been implemented.
10664 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10665 * std: `hashmap` and `trie` have been moved to `libcollections`
10666 * std: `run` has been rolled into `io::process`
10667 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10668 * std: The equality and comparison traits have seen some reorganization.
10669 * std: `rand` has moved to `librand`.
10670 * std: `to_{lower,upper}case` has been implemented for `char`.
10671 * std: Logging has been moved to `liblog`.
10672 * collections: `HashMap` has been rewritten for higher performance and less
10674 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10675 it can be booted manually. The runtime guide has more information and
10677 * native: All I/O functionality except signals has been implemented.
10678 * green: Task spawning with `libgreen` has been optimized with stack caching
10679 and various trimming of code.
10680 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10681 * sync: The `extra::sync` module has been updated to modern rust (and moved
10682 to the `sync` library), tweaking and improving various interfaces while
10683 dropping redundant functionality.
10684 * sync: A new `Barrier` type has been added to the `sync` library.
10685 * sync: An efficient mutex for native and green tasks has been implemented.
10686 * serialize: The `base64` module has seen some improvement. It treats
10687 newlines better, has non-string error values, and has seen general
10689 * fourcc: A `fourcc!` macro was introduced
10690 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10691 hexadecimal literal.
10694 * `rustpkg` has been deprecated and removed from the main repository. Its
10695 replacement, `cargo`, is under development.
10696 * Nightly builds of rust are now available
10697 * The memory usage of rustc has been improved many times throughout this
10699 * The build process supports disabling rpath support for the rustc binary
10701 * Code generation has improved in some cases, giving more information to the
10702 LLVM optimization passes to enable more extensive optimizations.
10703 * Debuginfo compatibility with lldb on OSX has been restored.
10704 * The master branch is now gated on an android bot, making building for
10705 android much more reliable.
10706 * Output flags have been centralized into one `--emit` flag.
10707 * Crate type flags have been centralized into one `--crate-type` flag.
10708 * Codegen flags have been consolidated behind a `-C` flag.
10709 * Linking against outdated crates now has improved error messages.
10710 * Error messages with lifetimes will often suggest how to annotate the
10711 function to fix the error.
10712 * Many more types are documented in the standard library, and new guides
10714 * Many `rustdoc` improvements:
10715 * code blocks are syntax highlighted.
10716 * render standalone markdown files.
10717 * the --test flag tests all code blocks by default.
10718 * exported macros are displayed.
10719 * re-exported types have their documentation inlined at the location of the
10721 * search works across crates that have been rendered to the same output
10725 Version 0.9 (2014-01-09)
10726 ==========================
10728 * ~1800 changes, numerous bugfixes
10731 * The `float` type has been removed. Use `f32` or `f64` instead.
10732 * A new facility for enabling experimental features (feature gating) has
10733 been added, using the crate-level `#[feature(foo)]` attribute.
10734 * Managed boxes (@) are now behind a feature gate
10735 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10736 standard library's `Gc` or `Rc` types instead.
10737 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10738 * Jumping back to the top of a loop is now done with `continue` instead of
10740 * Strings can no longer be mutated through index assignment.
10741 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10742 hash delimiters, as in `r###"foo"###`.
10743 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10745 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10746 * `@fn`s have been removed.
10747 * `do` only works with procs in order to make it obvious what the cost
10749 * Single-element tuple-like structs can no longer be dereferenced to
10750 obtain the inner value. A more comprehensive solution for overloading
10751 the dereference operator will be provided in the future.
10752 * The `#[link(...)]` attribute has been replaced with
10753 `#[crate_id = "name#vers"]`.
10754 * Empty `impl`s must be terminated with empty braces and may not be
10755 terminated with a semicolon.
10756 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10757 no longer has any special meaning.
10758 * The old `fmt!` string formatting macro has been removed.
10759 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10760 `print!` and `println!`.
10761 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10762 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10763 `extern mod foo = "bar"` instead.
10764 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10765 * Macros can have attributes.
10766 * Macros can expand to items with attributes.
10767 * Macros can expand to multiple items.
10768 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10769 * Comments may be nested.
10770 * Values automatically coerce to trait objects they implement, without
10772 * Enum discriminants are no longer an entire word but as small as needed to
10773 contain all the variants. The `repr` attribute can be used to override
10774 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10775 `#[repr(C)]` to match C enums.
10776 * Non-string literals are not allowed in attributes (they never worked).
10777 * The FFI now supports variadic functions.
10778 * Octal numeric literals, as in `0o7777`.
10779 * The `concat!` syntax extension performs compile-time string concatenation.
10780 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10781 removed as Rust no longer uses segmented stacks.
10782 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10783 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10784 not `*`; ignoring remaining fields of a struct is also done with `..`,
10785 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10786 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10787 * `rustc` supports the "system" calling convention, which defaults to the
10788 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10790 * The `type_overflow` lint (default: warn) checks literals for overflow.
10791 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10792 * The `attribute_usage` lint (default: warn) warns about unknown
10794 * The `unknown_features` lint (default: warn) warns about unknown
10796 * The `dead_code` lint (default: warn) checks for dead code.
10797 * Rust libraries can be linked statically to one another
10798 * `#[link_args]` is behind the `link_args` feature gate.
10799 * Native libraries are now linked with `#[link(name = "foo")]`
10800 * Native libraries can be statically linked to a rust crate
10801 (`#[link(name = "foo", kind = "static")]`).
10802 * Native OS X frameworks are now officially supported
10803 (`#[link(name = "foo", kind = "framework")]`).
10804 * The `#[thread_local]` attribute creates thread-local (not task-local)
10805 variables. Currently behind the `thread_local` feature gate.
10806 * The `return` keyword may be used in closures.
10807 * Types that can be copied via a memcpy implement the `Pod` kind.
10808 * The `cfg` attribute can now be used on struct fields and enum variants.
10811 * std: The `option` and `result` API's have been overhauled to make them
10812 simpler, more consistent, and more composable.
10813 * std: The entire `std::io` module has been replaced with one that is
10814 more comprehensive and that properly interfaces with the underlying
10815 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10817 * std: `io::util` contains a number of useful implementations of
10818 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10819 `ZeroReader`, `TeeReader`.
10820 * std: The reference counted pointer type `extra::rc` moved into std.
10821 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10822 just a wrapper around it).
10823 * std: The `Either` type has been removed.
10824 * std: `fmt::Default` can be implemented for any type to provide default
10825 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10826 * std: The `rand` API continues to be tweaked.
10827 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10828 on failure in gdb, is now named `rust_fail`.
10829 * std: The `each_key` and `each_value` methods on `HashMap` have been
10830 replaced by the `keys` and `values` iterators.
10831 * std: Functions dealing with type size and alignment have moved from the
10832 `sys` module to the `mem` module.
10833 * std: The `path` module was written and API changed.
10834 * std: `str::from_utf8` has been changed to cast instead of allocate.
10835 * std: `starts_with` and `ends_with` methods added to vectors via the
10836 `ImmutableEqVector` trait, which is in the prelude.
10837 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10838 if the index is out of bounds.
10839 * std: Task failure no longer propagates between tasks, as the model was
10840 complex, expensive, and incompatible with thread-based tasks.
10841 * std: The `Any` type can be used for dynamic typing.
10842 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10844 * std: Methods that produce iterators generally do not have an `_iter`
10846 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10847 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10848 * std: `util::ignore` renamed to `prelude::drop`.
10849 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10851 * std: `vec::raw` has seen a lot of cleanup and API changes.
10852 * std: The standard library no longer includes any C++ code, and very
10853 minimal C, eliminating the dependency on libstdc++.
10854 * std: Runtime scheduling and I/O functionality has been factored out into
10855 extensible interfaces and is now implemented by two different crates:
10856 libnative, for native threading and I/O; and libgreen, for green threading
10857 and I/O. This paves the way for using the standard library in more limited
10858 embedded environments.
10859 * std: The `comm` module has been rewritten to be much faster, have a
10860 simpler, more consistent API, and to work for both native and green
10862 * std: All libuv dependencies have been moved into the rustuv crate.
10863 * native: New implementations of runtime scheduling on top of OS threads.
10864 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10866 * green: The green thread scheduler and message passing types are almost
10867 entirely lock-free.
10868 * extra: The `flatpipes` module had bitrotted and was removed.
10869 * extra: All crypto functions have been removed and Rust now has a policy of
10870 not reimplementing crypto in the standard library. In the future crypto
10871 will be provided by external crates with bindings to established libraries.
10872 * extra: `c_vec` has been modernized.
10873 * extra: The `sort` module has been removed. Use the `sort` method on
10877 * The `rust` and `rusti` commands have been removed, due to lack of
10879 * `rustdoc` was completely rewritten.
10880 * `rustdoc` can test code examples in documentation.
10881 * `rustpkg` can test packages with the argument, 'test'.
10882 * `rustpkg` supports arbitrary dependencies, including C libraries.
10883 * `rustc`'s support for generating debug info is improved again.
10884 * `rustc` has better error reporting for unbalanced delimiters.
10885 * `rustc`'s JIT support was removed due to bitrot.
10886 * Executables and static libraries can be built with LTO (-Z lto)
10887 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10891 Version 0.8 (2013-09-26)
10892 ============================
10894 * ~2200 changes, numerous bugfixes
10897 * The `for` loop syntax has changed to work with the `Iterator` trait.
10898 * At long last, unwinding works on Windows.
10899 * Default methods are ready for use.
10900 * Many trait inheritance bugs fixed.
10901 * Owned and borrowed trait objects work more reliably.
10902 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10903 * rustc can omit emission of code for the `debug!` macro if it is passed
10905 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10906 for foo.rs, then foo/mod.rs, and will generate an error when both are
10908 * Strings no longer contain trailing nulls. The new `std::c_str` module
10909 provides new mechanisms for converting to C strings.
10910 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10911 * The FFI has been overhauled such that foreign functions are called directly,
10912 instead of through a stack-switching wrapper.
10913 * Calling a foreign function must be done through a Rust function with the
10914 `#[fixed_stack_segment]` attribute.
10915 * The `externfn!` macro can be used to declare both a foreign function and
10916 a `#[fixed_stack_segment]` wrapper at once.
10917 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10918 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10919 * `priv` is disallowed everywhere except for struct fields and enum variants.
10920 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10921 * `ref` bindings in irrefutable patterns work correctly now.
10922 * `char` is now prevented from containing invalid code points.
10923 * Casting to `bool` is no longer allowed.
10924 * `\0` is now accepted as an escape in chars and strings.
10925 * `yield` is a reserved keyword.
10926 * `typeof` is a reserved keyword.
10927 * Crates may be imported by URL with `extern mod foo = "url";`.
10928 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10929 * Static vectors can be initialized with repeating elements,
10930 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10931 * Static structs can be initialized with functional record update,
10932 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10933 * `cfg!` can be used to conditionally execute code based on the crate
10934 configuration, similarly to `#[cfg(...)]`.
10935 * The `unnecessary_qualification` lint detects unneeded module
10936 prefixes (default: allow).
10937 * Arithmetic operations have been implemented on the SIMD types in
10938 `std::unstable::simd`.
10939 * Exchange allocation headers were removed, reducing memory usage.
10940 * `format!` implements a completely new, extensible, and higher-performance
10941 string formatting system. It will replace `fmt!`.
10942 * `print!` and `println!` write formatted strings (using the `format!`
10943 extension) to stdout.
10944 * `write!` and `writeln!` write formatted strings (using the `format!`
10945 extension) to the new Writers in `std::rt::io`.
10946 * The library section in which a function or static is placed may
10947 be specified with `#[link_section = "..."]`.
10948 * The `proto!` syntax extension for defining bounded message protocols
10950 * `macro_rules!` is hygienic for `let` declarations.
10951 * The `#[export_name]` attribute specifies the name of a symbol.
10952 * `unreachable!` can be used to indicate unreachable code, and fails
10956 * std: Transitioned to the new runtime, written in Rust.
10957 * std: Added an experimental I/O library, `rt::io`, based on the new
10959 * std: A new generic `range` function was added to the prelude, replacing
10960 `uint::range` and friends.
10961 * std: `range_rev` no longer exists. Since range is an iterator it can be
10962 reversed with `range(lo, hi).invert()`.
10963 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10964 renamed to `unwrap_or`.
10965 * std: The `iterator` module was renamed to `iter`.
10966 * std: Integral types now support the `checked_add`, `checked_sub`, and
10967 `checked_mul` operations for detecting overflow.
10968 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10970 * std: Methods are standardizing on conventions for casting methods:
10971 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10973 * std: The `CString` type in `c_str` provides new ways to convert to and
10975 * std: `DoubleEndedIterator` can yield elements in two directions.
10976 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10978 * std: `str::from_bytes` renamed to `str::from_utf8`.
10979 * std: `pop_opt` and `shift_opt` methods added to vectors.
10980 * std: The task-local data interface no longer uses @, and keys are
10981 no longer function pointers.
10982 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10983 * std: Added `SharedPort` to `comm`.
10984 * std: `Eq` has a default method for `ne`; only `eq` is required
10985 in implementations.
10986 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10987 is required in implementations.
10988 * std: `is_utf8` performance is improved, impacting many string functions.
10989 * std: `os::MemoryMap` provides cross-platform mmap.
10990 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10991 are not 'in-bounds' are considered undefined.
10992 * std: Many freestanding functions in `vec` removed in favor of methods.
10993 * std: Many freestanding functions on scalar types removed in favor of
10995 * std: Many options to task builders were removed since they don't make
10996 sense in the new scheduler design.
10997 * std: More containers implement `FromIterator` so can be created by the
10999 * std: More complete atomic types in `unstable::atomics`.
11000 * std: `comm::PortSet` removed.
11001 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11002 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11003 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11004 default implementations.
11005 * std: Various `from_str` functions were removed in favor of a generic
11006 `from_str` which is available in the prelude.
11007 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11008 * extra: `dlist`, the doubly-linked list was modernized.
11009 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11010 * extra: Added `glob` module, replacing `std::os::glob`.
11011 * extra: `rope` was removed.
11012 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11013 * extra: `net`, and `timer` were removed. The experimental replacements
11014 are `std::rt::io::net` and `std::rt::io::timer`.
11015 * extra: Iterators implemented for `SmallIntMap`.
11016 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11017 * extra: `SmallIntSet` removed. Use `BitvSet`.
11018 * extra: Performance of JSON parsing greatly improved.
11019 * extra: `semver` updated to SemVer 2.0.0.
11020 * extra: `term` handles more terminals correctly.
11021 * extra: `dbg` module removed.
11022 * extra: `par` module removed.
11023 * extra: `future` was cleaned up, with some method renames.
11024 * extra: Most free functions in `getopts` were converted to methods.
11027 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11028 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11029 similarly to gcc's `--march` flag.
11030 * rustc's performance compiling small crates is much better.
11031 * rustpkg has received many improvements.
11032 * rustpkg supports git tags as package IDs.
11033 * rustpkg builds into target-specific directories so it can be used for
11035 * The number of concurrent test tasks is controlled by the environment
11036 variable RUST_TEST_TASKS.
11037 * The test harness can now report metrics for benchmarks.
11038 * All tools have man pages.
11039 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11040 * The runtime uses jemalloc for allocations.
11041 * Segmented stacks are temporarily disabled as part of the transition to
11042 the new runtime. Stack overflows are possible!
11043 * A new documentation backend, rustdoc_ng, is available for use. It is
11044 still invoked through the normal `rustdoc` command.
11047 Version 0.7 (2013-07-03)
11048 =======================
11050 * ~2000 changes, numerous bugfixes
11053 * `impl`s no longer accept a visibility qualifier. Put them on methods
11055 * The borrow checker has been rewritten with flow-sensitivity, fixing
11056 many bugs and inconveniences.
11057 * The `self` parameter no longer implicitly means `&'self self`,
11058 and can be explicitly marked with a lifetime.
11059 * Overloadable compound operators (`+=`, etc.) have been temporarily
11060 removed due to bugs.
11061 * The `for` loop protocol now requires `for`-iterators to return `bool`
11062 so they compose better.
11063 * The `Durable` trait is replaced with the `'static` bounds.
11064 * Trait default methods work more often.
11065 * Structs with the `#[packed]` attribute have byte alignment and
11066 no padding between fields.
11067 * Type parameters bound by `Copy` must now be copied explicitly with
11068 the `copy` keyword.
11069 * It is now illegal to move out of a dereferenced unsafe pointer.
11070 * `Option<~T>` is now represented as a nullable pointer.
11071 * `@mut` does dynamic borrow checks correctly.
11072 * The `main` function is only detected at the topmost level of the crate.
11073 The `#[main]` attribute is still valid anywhere.
11074 * Struct fields may no longer be mutable. Use inherited mutability.
11075 * The `#[no_send]` attribute makes a type that would otherwise be
11077 * The `#[no_freeze]` attribute makes a type that would otherwise be
11079 * Unbounded recursion will abort the process after reaching the limit
11080 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11081 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11082 are never implicitly copyable.
11083 * `#[static_assert]` makes compile-time assertions about static bools.
11084 * At long last, 'argument modes' no longer exist.
11085 * The rarely used `use mod` statement no longer exists.
11087 * Syntax extensions
11088 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11090 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11091 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11092 `#[deriving(...)]`.
11093 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11094 and unsuffixed integer literals.
11097 * The `core` crate was renamed to `std`.
11098 * The `std` crate was renamed to `extra`.
11099 * More and improved documentation.
11100 * std: `iterator` module for external iterator objects.
11101 * Many old-style (internal, higher-order function) iterators replaced by
11102 implementations of `Iterator`.
11103 * std: Many old internal vector and string iterators,
11104 incl. `any`, `all`. removed.
11105 * std: The `finalize` method of `Drop` renamed to `drop`.
11106 * std: The `drop` method now takes `&mut self` instead of `&self`.
11107 * std: The prelude no longer re-exports any modules, only types and traits.
11108 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11109 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11110 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11111 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11112 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11113 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11114 * std: Many types implement `Clone`.
11115 * std: `path` type renamed to `Path`.
11116 * std: `mut` module and `Mut` type removed.
11117 * std: Many standalone functions removed in favor of methods and iterators
11118 in `vec`, `str`. In the future methods will also work as functions.
11119 * std: `reinterpret_cast` removed. Use `transmute`.
11120 * std: ascii string handling in `std::ascii`.
11121 * std: `Rand` is implemented for ~/@.
11122 * std: `run` module for spawning processes overhauled.
11123 * std: Various atomic types added to `unstable::atomic`.
11124 * std: Various types implement `Zero`.
11125 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11126 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11127 * std: Added `os::mkdir_recursive`.
11128 * std: Added `os::glob` function performs filesystems globs.
11129 * std: `FuzzyEq` renamed to `ApproxEq`.
11130 * std: `Map` now defines `pop` and `swap` methods.
11131 * std: `Cell` constructors converted to static methods.
11132 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11133 * extra: `flate` module moved from `std` to `extra`.
11134 * extra: `fileinput` module for iterating over a series of files.
11135 * extra: `Complex` number type and `complex` module.
11136 * extra: `Rational` number type and `rational` module.
11137 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11138 * extra: `term` uses terminfo now, is more correct.
11139 * extra: `arc` functions converted to methods.
11140 * extra: Implementation of fixed output size variations of SHA-2.
11143 * `unused_variables` lint mode for unused variables (default: warn).
11144 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11146 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11148 * `dead_assignment` lint mode for unread variables (default: warn).
11149 * `unnecessary_allocation` lint mode detects some heap allocations that are
11150 immediately borrowed so could be written without allocating (default: warn).
11151 * `missing_doc` lint mode (default: allow).
11152 * `unreachable_code` lint mode (default: warn).
11153 * The `rusti` command has been rewritten and a number of bugs addressed.
11154 * rustc outputs in color on more terminals.
11155 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11156 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11157 * Compiling with `-g` will make the binary record information about
11158 dynamic borrowcheck failures for debugging.
11159 * rustdoc has a nicer stylesheet.
11160 * Various improvements to rustdoc.
11161 * Improvements to rustpkg (see the detailed release notes).
11164 Version 0.6 (2013-04-03)
11165 ========================
11167 * ~2100 changes, numerous bugfixes
11170 * The self type parameter in traits is now spelled `Self`
11171 * The `self` parameter in trait and impl methods must now be explicitly
11172 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11173 * Static methods no longer require the `static` keyword and instead
11174 are distinguished by the lack of a `self` parameter
11175 * Replaced the `Durable` trait with the `'static` lifetime
11176 * The old closure type syntax with the trailing sigil has been
11177 removed in favor of the more consistent leading sigil
11178 * `super` is a keyword, and may be prefixed to paths
11179 * Trait bounds are separated with `+` instead of whitespace
11180 * Traits are implemented with `impl Trait for Type`
11181 instead of `impl Type: Trait`
11182 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11183 * The `export` keyword has finally been removed
11184 * The `move` keyword has been removed (see "Semantic changes")
11185 * The interior mutability qualifier on vectors, `[mut T]`, has been
11186 removed. Use `&mut [T]`, etc.
11187 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11188 * `fail` is no longer a keyword. Use `fail!()`
11189 * `assert` is no longer a keyword. Use `assert!()`
11190 * `log` is no longer a keyword. use `debug!`, etc.
11191 * 1-tuples may be represented as `(T,)`
11192 * Struct fields may no longer be `mut`. Use inherited mutability,
11193 `@mut T`, `core::mut` or `core::cell`
11194 * `extern mod { ... }` is no longer valid syntax for foreign
11195 function modules. Use extern blocks: `extern { ... }`
11196 * Newtype enums removed. Use tuple-structs.
11197 * Trait implementations no longer support visibility modifiers
11198 * Pattern matching over vectors improved and expanded
11199 * `const` renamed to `static` to correspond to lifetime name,
11200 and make room for future `static mut` unsafe mutable globals.
11201 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11202 * `Clone` implementations can be automatically generated with
11203 `#[deriving(Clone)]`
11204 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11205 instead of `foo as Bar`.
11206 * Fixed length vector types are now written as `[int, .. 3]`
11207 instead of `[int * 3]`.
11208 * Fixed length vector types can express the length as a constant
11209 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11212 * Types with owned pointers or custom destructors move by default,
11213 eliminating the `move` keyword
11214 * All foreign functions are considered unsafe
11215 * &mut is now unaliasable
11216 * Writes to borrowed @mut pointers are prevented dynamically
11218 * The name of the main function can be customized using #[main]
11219 * The default type of an inferred closure is &fn instead of @fn
11220 * `use` statements may no longer be "chained" - they cannot import
11221 identifiers imported by previous `use` statements
11222 * `use` statements are crate relative, importing from the "top"
11223 of the crate by default. Paths may be prefixed with `super::`
11224 or `self::` to change the search behavior.
11225 * Method visibility is inherited from the implementation declaration
11226 * Structural records have been removed
11227 * Many more types can be used in static items, including enums
11228 'static-lifetime pointers and vectors
11229 * Pattern matching over vectors improved and expanded
11230 * Typechecking of closure types has been overhauled to
11231 improve inference and eliminate unsoundness
11232 * Macros leave scope at the end of modules, unless that module is
11233 tagged with #[macro_escape]
11236 * Added big integers to `std::bigint`
11237 * Removed `core::oldcomm` module
11238 * Added pipe-based `core::comm` module
11239 * Numeric traits have been reorganized under `core::num`
11240 * `vec::slice` finally returns a slice
11241 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11242 * Containers reorganized around traits in `core::container`
11243 * `core::dvec` removed, `~[T]` is a drop-in replacement
11244 * `core::send_map` renamed to `core::hashmap`
11245 * `std::map` removed; replaced with `core::hashmap`
11246 * `std::treemap` reimplemented as an owned balanced tree
11247 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11248 * `core::trie` added as a fast ordered map for integer keys
11249 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11250 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11251 overload the comparison operators, whereas `TotalOrd` is used
11252 by certain container types
11255 * Replaced the 'cargo' package manager with 'rustpkg'
11256 * Added all-purpose 'rust' tool
11257 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11258 * rustc now *attempts* to offer spelling suggestions
11259 * Improved support for ARM and Android
11260 * Preliminary MIPS backend
11261 * Improved foreign function ABI implementation for x86, x86_64
11262 * Various memory usage improvements
11263 * Rust code may be embedded in foreign code under limited circumstances
11264 * Inline assembler supported by new asm!() syntax extension.
11267 Version 0.5 (2012-12-21)
11268 ===========================
11270 * ~900 changes, numerous bugfixes
11273 * Removed `<-` move operator
11274 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11275 * Removed old fixed length vector syntax - `[T]/N`
11276 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11277 * Macros may now expand to items and statements
11278 * `a.b()` is always parsed as a method call, never as a field projection
11279 * `Eq` and `IterBytes` implementations can be automatically generated
11280 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11281 * Removed the special crate language for `.rc` files
11282 * Function arguments may consist of any irrefutable pattern
11285 * `&` and `~` pointers may point to objects
11286 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11287 * Enum variants may be structs
11288 * Destructors can be added to all nominal types with the Drop trait
11289 * Structs and nullary enum variants may be constants
11290 * Values that cannot be implicitly copied are now automatically moved
11291 without writing `move` explicitly
11292 * `&T` may now be coerced to `*T`
11293 * Coercions happen in `let` statements as well as function calls
11294 * `use` statements now take crate-relative paths
11295 * The module and type namespaces have been merged so that static
11296 method names can be resolved under the trait in which they are
11299 * Improved support for language features
11300 * Trait inheritance works in many scenarios
11301 * More support for explicit self arguments in methods - `self`, `&self`
11302 `@self`, and `~self` all generally work as expected
11303 * Static methods work in more situations
11304 * Experimental: Traits may declare default methods for the implementations
11308 * New condition handling system in `core::condition`
11309 * Timsort added to `std::sort`
11310 * New priority queue, `std::priority_queue`
11311 * Pipes for serializable types, `std::flatpipes'
11312 * Serialization overhauled to be trait-based
11313 * Expanded `getopts` definitions
11314 * Moved futures to `std`
11315 * More functions are pure now
11316 * `core::comm` renamed to `oldcomm`. Still deprecated
11317 * `rustdoc` and `cargo` are libraries now
11320 * Added a preliminary REPL, `rusti`
11321 * License changed from MIT to dual MIT/APL2
11324 Version 0.4 (2012-10-15)
11325 ==========================
11327 * ~2000 changes, numerous bugfixes
11330 * All keywords are now strict and may not be used as identifiers anywhere
11331 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11332 'of', 'with', 'to', 'class'.
11333 * Classes are replaced with simpler structs
11334 * Explicit method self types
11335 * `ret` became `return` and `alt` became `match`
11336 * `import` is now `use`; `use is now `extern mod`
11337 * `extern mod { ... }` is now `extern { ... }`
11338 * `use mod` is the recommended way to import modules
11339 * `pub` and `priv` replace deprecated export lists
11340 * The syntax of `match` pattern arms now uses fat arrow (=>)
11341 * `main` no longer accepts an args vector; use `os::args` instead
11344 * Trait implementations are now coherent, ala Haskell typeclasses
11345 * Trait methods may be static
11346 * Argument modes are deprecated
11347 * Borrowed pointers are much more mature and recommended for use
11348 * Strings and vectors in the static region are stored in constant memory
11349 * Typestate was removed
11350 * Resolution rewritten to be more reliable
11351 * Support for 'dual-mode' data structures (freezing and thawing)
11354 * Most binary operators can now be overloaded via the traits in
11356 * `std::net::url` for representing URLs
11357 * Sendable hash maps in `core::send_map`
11358 * `core::task' gained a (currently unsafe) task-local storage API
11361 * An efficient new intertask communication primitive called the pipe,
11362 along with a number of higher-level channel types, in `core::pipes`
11363 * `std::arc`, an atomically reference counted, immutable, shared memory
11365 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11366 * Futures are now based on pipes and sendable
11367 * More robust linked task failure
11368 * Improved task builder API
11371 * Improved error reporting
11372 * Preliminary JIT support
11373 * Preliminary work on precise GC
11374 * Extensive architectural improvements to rustc
11375 * Begun a transition away from buggy C++-based reflection (shape) code to
11376 Rust-based (visitor) code
11377 * All hash functions and tables converted to secure, randomized SipHash
11380 Version 0.3 (2012-07-12)
11381 ========================
11383 * ~1900 changes, numerous bugfixes
11385 * New coding conveniences
11386 * Integer-literal suffix inference
11387 * Per-item control over warnings, errors
11388 * #[cfg(windows)] and #[cfg(unix)] attributes
11389 * Documentation comments
11390 * More compact closure syntax
11391 * 'do' expressions for treating higher-order functions as
11393 * *-patterns (wildcard extended to all constructor fields)
11396 * Name resolution pass and exhaustiveness checker rewritten
11397 * Region pointers and borrow checking supersede alias
11399 * Init-ness checking is now provided by a region-based liveness
11400 pass instead of the typestate pass; same for last-use analysis
11401 * Extensive work on region pointers
11403 * Experimental new language features
11404 * Slices and fixed-size, interior-allocated vectors
11405 * #!-comments for lang versioning, shell execution
11406 * Destructors and iface implementation for classes;
11407 type-parameterized classes and class methods
11408 * 'const' type kind for types that can be used to implement
11409 shared-memory concurrency patterns
11413 * Removal of various obsolete features
11414 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11415 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11417 * Constructs: do-while loops ('do' repurposed), fn binding,
11418 resources (replaced by destructors)
11420 * Compiler reorganization
11421 * Syntax-layer of compiler split into separate crate
11422 * Clang (from LLVM project) integrated into build
11423 * Typechecker split into sub-modules
11426 * New time functions
11427 * Extension methods for many built-in types
11428 * Arc: atomic-refcount read-only / exclusive-use shared cells
11429 * Par: parallel map and search routines
11430 * Extensive work on libuv interface
11431 * Much vector code moved to libraries
11432 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11433 #include, #include_str, #include_bin
11435 * Tool improvements
11436 * Cargo automatically resolves dependencies
11439 Version 0.2 (2012-03-29)
11440 =========================
11442 * >1500 changes, numerous bugfixes
11444 * New docs and doc tooling
11446 * New port: FreeBSD x86_64
11448 * Compilation model enhancements
11449 * Generics now specialized, multiply instantiated
11450 * Functions now inlined across separate crates
11452 * Scheduling, stack and threading fixes
11453 * Noticeably improved message-passing performance
11454 * Explicit schedulers
11458 * Experimental new language features
11459 * Operator overloading
11463 * Various language extensions
11464 * C-callback function types: 'crust fn ...'
11465 * Infinite-loop construct: 'loop { ... }'
11466 * Shorten 'mutable' to 'mut'
11467 * Required mutable-local qualifier: 'let mut ...'
11468 * Basic glob-exporting: 'export foo::*;'
11469 * Alt now exhaustive, 'alt check' for runtime-checked
11470 * Block-function form of 'for' loop, with 'break' and 'ret'.
11473 * AST quasi-quote syntax extension
11474 * Revived libuv interface
11475 * New modules: core::{future, iter}, std::arena
11476 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11477 * Extensive cleanup, regularization in libstd, libcore
11480 Version 0.1 (2012-01-20)
11481 ===============================
11483 * Most language features work, including:
11484 * Unique pointers, unique closures, move semantics
11485 * Interface-constrained generics
11486 * Static interface dispatch
11488 * Multithread task scheduling
11489 * Typestate predicates
11490 * Failure unwinding, destructors
11491 * Pattern matching and destructuring assignment
11492 * Lightweight block-lambda syntax
11493 * Preliminary macro-by-example
11495 * Compiler works with the following configurations:
11496 * Linux: x86 and x86_64 hosts and targets
11497 * macOS: x86 and x86_64 hosts and targets
11498 * Windows: x86 hosts and targets
11500 * Cross compilation / multi-target configuration supported.
11502 * Preliminary API-documentation and package-management tools included.
11506 * Documentation is incomplete.
11508 * Performance is below intended target.
11510 * Standard library APIs are subject to extensive change, reorganization.
11512 * Language-level versioning is not yet operational - future code will
11513 break unexpectedly.