1 Version 1.63.0 (2022-08-11)
2 ==========================
6 - [Remove migrate borrowck mode for pre-NLL errors.][95565]
7 - [Modify MIR building to drop repeat expressions with length zero.][95953]
8 - [Remove label/lifetime shadowing warnings.][96296]
9 - [Allow explicit generic arguments in the presence of `impl Trait` args.][96868]
10 - [Make `cenum_impl_drop_cast` warnings deny-by-default.][97652]
11 - [Prevent unwinding when `-C panic=abort` is used regardless of declared ABI.][96959]
12 - [lub: don't bail out due to empty binders.][97867]
16 - [Stabilize the `bundle` native library modifier,][95818] also removing the
17 deprecated `static-nobundle` linking kind.
18 - [Add Apple WatchOS compile targets\*.][95243]
19 - [Add a Windows application manifest to rustc-main.][96737]
21 \* Refer to Rust's [platform support page][platform-support-doc] for more
22 information on Rust's tiered platform support.
26 - [Implement `Copy`, `Clone`, `PartialEq` and `Eq` for `core::fmt::Alignment`.][94530]
27 - [Extend `ptr::null` and `null_mut` to all thin (including extern) types.][94954]
28 - [`impl Read and Write for VecDeque<u8>`.][95632]
29 - [STD support for the Nintendo 3DS.][95897]
30 - [Use rounding in float to Duration conversion methods.][96051]
31 - [Make write/print macros eagerly drop temporaries.][96455]
32 - [Implement internal traits that enable `[OsStr]::join`.][96881]
33 - [Implement `Hash` for `core::alloc::Layout`.][97034]
34 - [Add capacity documentation for `OsString`.][97202]
35 - [Put a bound on collection misbehavior.][97316]
36 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
37 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
38 - [Document Rust's stance on `/proc/self/mem`.][97837]
45 - [`BinaryHeap::try_reserve`]
46 - [`BinaryHeap::try_reserve_exact`]
47 - [`OsString::try_reserve`]
48 - [`OsString::try_reserve_exact`]
49 - [`PathBuf::try_reserve`]
50 - [`PathBuf::try_reserve_exact`]
51 - [`Path::try_exists`]
53 - [`RefMut::filter_map`]
54 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
55 - [`ToOwned::clone_into`]
56 - [`Ipv6Addr::to_ipv4_mapped`]
58 - [`unix::io::BorrowedFd<'fd>`]
59 - [`unix::io::OwnedFd`]
60 - [`windows::io::AsHandle`]
61 - [`windows::io::BorrowedHandle<'handle>`]
62 - [`windows::io::OwnedHandle`]
63 - [`windows::io::HandleOrInvalid`]
64 - [`windows::io::HandleOrNull`]
65 - [`windows::io::InvalidHandleError`]
66 - [`windows::io::NullHandleError`]
67 - [`windows::io::AsSocket`]
68 - [`windows::io::BorrowedSocket<'handle>`]
69 - [`windows::io::OwnedSocket`]
72 - [`thread::ScopedJoinHandle`]
74 These APIs are now usable in const contexts:
78 - [`intrinsics::copy`]
79 - [`intrinsics::copy_nonoverlapping`]
80 - [`<*const T>::copy_to`]
81 - [`<*const T>::copy_to_nonoverlapping`]
82 - [`<*mut T>::copy_to`]
83 - [`<*mut T>::copy_to_nonoverlapping`]
84 - [`<*mut T>::copy_from`]
85 - [`<*mut T>::copy_from_nonoverlapping`]
87 - [`Utf8Error::error_len`]
88 - [`Utf8Error::valid_up_to`]
95 - [Stabilize the `--config path` command-line argument.][cargo/10755]
96 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
101 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
102 errors for invalid attribute arguments that were previously ignored.
103 - [Rounding is now used when converting a float to a `Duration`.][96051] The converted
104 duration can differ slightly from what it was.
109 These changes provide no direct user facing benefits, but represent significant
110 improvements to the internals and overall performance of rustc
113 - [Prepare Rust for LLVM opaque pointers.][94214]
115 [94214]: https://github.com/rust-lang/rust/pull/94214/
116 [94530]: https://github.com/rust-lang/rust/pull/94530/
117 [94954]: https://github.com/rust-lang/rust/pull/94954/
118 [95243]: https://github.com/rust-lang/rust/pull/95243/
119 [95565]: https://github.com/rust-lang/rust/pull/95565/
120 [95632]: https://github.com/rust-lang/rust/pull/95632/
121 [95818]: https://github.com/rust-lang/rust/pull/95818/
122 [95897]: https://github.com/rust-lang/rust/pull/95897/
123 [95953]: https://github.com/rust-lang/rust/pull/95953/
124 [96051]: https://github.com/rust-lang/rust/pull/96051/
125 [96296]: https://github.com/rust-lang/rust/pull/96296/
126 [96455]: https://github.com/rust-lang/rust/pull/96455/
127 [96737]: https://github.com/rust-lang/rust/pull/96737/
128 [96868]: https://github.com/rust-lang/rust/pull/96868/
129 [96881]: https://github.com/rust-lang/rust/pull/96881/
130 [96885]: https://github.com/rust-lang/rust/pull/96885/
131 [96959]: https://github.com/rust-lang/rust/pull/96959/
132 [97034]: https://github.com/rust-lang/rust/pull/97034/
133 [97202]: https://github.com/rust-lang/rust/pull/97202/
134 [97316]: https://github.com/rust-lang/rust/pull/97316/
135 [97652]: https://github.com/rust-lang/rust/pull/97652/
136 [97675]: https://github.com/rust-lang/rust/pull/97675/
137 [97803]: https://github.com/rust-lang/rust/pull/97803/
138 [97837]: https://github.com/rust-lang/rust/pull/97837/
139 [97867]: https://github.com/rust-lang/rust/pull/97867/
140 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
141 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
143 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
144 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
145 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
146 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
147 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
148 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
149 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
150 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
151 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
152 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
153 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
154 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
155 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
156 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
157 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
158 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
159 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
160 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
161 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
162 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
163 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
164 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
165 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
166 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
167 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
168 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
169 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
170 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
171 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
172 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
174 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
175 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
176 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
177 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
178 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
179 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
180 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
181 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
182 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
183 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
184 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
185 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
186 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
187 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
188 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
189 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
191 Version 1.62.1 (2022-07-19)
192 ==========================
194 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
195 library, and also mitigates a CPU vulnerability on Intel SGX.
197 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
198 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
199 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
200 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
201 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
203 [98608]: https://github.com/rust-lang/rust/issues/98608
204 [98890]: https://github.com/rust-lang/rust/issues/98890
205 [98950]: https://github.com/rust-lang/rust/pull/98950
206 [98126]: https://github.com/rust-lang/rust/pull/98126
207 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
209 Version 1.62.0 (2022-06-30)
210 ==========================
215 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
216 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
217 - [Fix constants not getting dropped if part of a diverging expression][94775]
218 - [Support unit struct/enum variant in destructuring assignment][95380]
219 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
224 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
225 - [Make `unaligned_references` lint deny-by-default][95372]
226 This lint is also a future compatibility lint, and is expected to eventually
228 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
229 - [Reject `#[thread_local]` attribute on non-static items][95006]
230 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
231 - [Implement a lint to warn about unused macro rules][96150]
232 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
234 \* Refer to Rust's [platform support page][platform-support-doc] for more
235 information on Rust's tiered platform support.
240 - [Windows: Use a pipe relay for chaining pipes][95841]
241 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
242 - [Replace RwLock by a futex based one on Linux][95801]
243 - [std: directly use pthread in UNIX parker implementation][96393]
248 - [`bool::then_some`]
252 - [`windows::CommandExt::raw_arg`]
253 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
254 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
255 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
256 - [`FusedIterator for EncodeWide`]
257 - [RDM intrinsics on aarch64][stdarch/1285]
262 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
267 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
269 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
270 - Package ID specs now support `name@version` syntax in addition to the
271 previous `name:version` to align with the behavior in `cargo add` and other
272 tools. `cargo install` and `cargo yank` also now support this syntax so the
273 version does not need to passed as a separate flag.
274 - The `git` and `registry` directories in Cargo's home directory (usually
275 `~/.cargo`) are now marked as cache directories so that they are not
276 included in backups or content indexing (on Windows).
277 - Added automatic `@` argfile support, which will use "response files" if the
278 command-line to `rustc` exceeds the operating system's limit.
283 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
284 the same as the host target.
285 [#10594](https://github.com/rust-lang/cargo/pull/10594)
286 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
287 - [rustdoc: Remove .woff font files][96279]
288 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
289 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
290 complete synchronously][95469].
295 - [Unify ReentrantMutex implementations across all platforms][96042]
297 These changes provide no direct user facing benefits, but represent significant
298 improvements to the internals and overall performance of rustc
301 [93313]: https://github.com/rust-lang/rust/pull/93313/
302 [93969]: https://github.com/rust-lang/rust/pull/93969/
303 [94206]: https://github.com/rust-lang/rust/pull/94206/
304 [94457]: https://github.com/rust-lang/rust/pull/94457/
305 [94775]: https://github.com/rust-lang/rust/pull/94775/
306 [94872]: https://github.com/rust-lang/rust/pull/94872/
307 [95006]: https://github.com/rust-lang/rust/pull/95006/
308 [95035]: https://github.com/rust-lang/rust/pull/95035/
309 [95372]: https://github.com/rust-lang/rust/pull/95372/
310 [95380]: https://github.com/rust-lang/rust/pull/95380/
311 [95431]: https://github.com/rust-lang/rust/pull/95431/
312 [95469]: https://github.com/rust-lang/rust/pull/95469/
313 [95705]: https://github.com/rust-lang/rust/pull/95705/
314 [95801]: https://github.com/rust-lang/rust/pull/95801/
315 [95819]: https://github.com/rust-lang/rust/pull/95819/
316 [95841]: https://github.com/rust-lang/rust/pull/95841/
317 [96042]: https://github.com/rust-lang/rust/pull/96042/
318 [96150]: https://github.com/rust-lang/rust/pull/96150/
319 [96268]: https://github.com/rust-lang/rust/pull/96268/
320 [96279]: https://github.com/rust-lang/rust/pull/96279/
321 [96393]: https://github.com/rust-lang/rust/pull/96393/
322 [96436]: https://github.com/rust-lang/rust/pull/96436/
323 [96557]: https://github.com/rust-lang/rust/pull/96557/
324 [96630]: https://github.com/rust-lang/rust/pull/96630/
326 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
327 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
328 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
329 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
330 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
331 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
332 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
333 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
334 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
335 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
337 Version 1.61.0 (2022-05-19)
338 ==========================
343 - [`const fn` signatures can now include generic trait bounds][93827]
344 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
345 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
346 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
351 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
352 - [The `char` type is now described as UTF-32 in debuginfo][89887]
353 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
354 - X86 [`#[target_feature = "adx"]` is now stable][93745]
359 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
360 - [`#[ignore = "…"]` messages are printed when running tests][92714]
361 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
362 - [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.
363 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
364 - [`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.
369 - [`Pin::static_mut`]
370 - [`Pin::static_ref`]
371 - [`Vec::retain_mut`]
372 - [`VecDeque::retain_mut`]
373 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
374 - [`std::os::unix::net::SocketAddr::from_pathname`]
375 - [`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.
376 - [`std::thread::JoinHandle::is_finished`]
378 These APIs are now usable in const contexts:
380 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
381 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
382 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
383 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
384 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
385 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
386 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
387 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
388 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
393 No feature changes, but see compatibility notes.
398 - 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
399 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
400 - (less common) or be updated to use the [`+whole-archive`] modifier.
401 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
402 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
403 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
404 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
405 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
406 - [`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`.
407 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
412 These changes provide no direct user facing benefits, but represent significant
413 improvements to the internals and overall performance of rustc
416 - [debuginfo: Refactor debuginfo generation for types][94261]
417 - [Remove the everybody loops pass][93913]
419 [88375]: https://github.com/rust-lang/rust/pull/88375/
420 [89887]: https://github.com/rust-lang/rust/pull/89887/
421 [90621]: https://github.com/rust-lang/rust/pull/90621/
422 [92285]: https://github.com/rust-lang/rust/pull/92285/
423 [92472]: https://github.com/rust-lang/rust/pull/92472/
424 [92697]: https://github.com/rust-lang/rust/pull/92697/
425 [92714]: https://github.com/rust-lang/rust/pull/92714/
426 [92911]: https://github.com/rust-lang/rust/pull/92911/
427 [93263]: https://github.com/rust-lang/rust/pull/93263/
428 [93745]: https://github.com/rust-lang/rust/pull/93745/
429 [93827]: https://github.com/rust-lang/rust/pull/93827/
430 [93901]: https://github.com/rust-lang/rust/pull/93901/
431 [93913]: https://github.com/rust-lang/rust/pull/93913/
432 [93965]: https://github.com/rust-lang/rust/pull/93965/
433 [94081]: https://github.com/rust-lang/rust/pull/94081/
434 [94261]: https://github.com/rust-lang/rust/pull/94261/
435 [94295]: https://github.com/rust-lang/rust/pull/94295/
436 [94832]: https://github.com/rust-lang/rust/pull/94832/
437 [95016]: https://github.com/rust-lang/rust/pull/95016/
438 [95251]: https://github.com/rust-lang/rust/pull/95251/
439 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
440 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
441 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
442 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
443 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
444 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
445 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
446 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
447 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
448 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
449 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
450 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
451 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
452 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
453 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
454 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
455 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
456 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
457 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
458 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
459 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
460 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
463 Version 1.60.0 (2022-04-07)
464 ==========================
468 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
469 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
473 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
474 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
475 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
476 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
477 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
478 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
479 - [Fix invalid removal of newlines from doc comments][92357]
480 - [Add kernel target for RustyHermit][92670]
481 - [Deny mixing bin crate type with lib crate types][92933]
482 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
483 - [Upgrade to LLVM 14][93577]
485 \* Refer to Rust's [platform support page][platform-support-doc] for more
486 information on Rust's tiered platform support.
490 - [Guarantee call order for `sort_by_cached_key`][89621]
491 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
492 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
493 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
494 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
498 - [`Arc::new_cyclic`][arc_new_cyclic]
499 - [`Rc::new_cyclic`][rc_new_cyclic]
500 - [`slice::EscapeAscii`][slice_escape_ascii]
501 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
502 - [`u8::escape_ascii`][u8_escape_ascii]
503 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
504 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
505 - [`MaybeUninit::assume_init_read`][assume_init_read]
506 - [`i8::abs_diff`][i8_abs_diff]
507 - [`i16::abs_diff`][i16_abs_diff]
508 - [`i32::abs_diff`][i32_abs_diff]
509 - [`i64::abs_diff`][i64_abs_diff]
510 - [`i128::abs_diff`][i128_abs_diff]
511 - [`isize::abs_diff`][isize_abs_diff]
512 - [`u8::abs_diff`][u8_abs_diff]
513 - [`u16::abs_diff`][u16_abs_diff]
514 - [`u32::abs_diff`][u32_abs_diff]
515 - [`u64::abs_diff`][u64_abs_diff]
516 - [`u128::abs_diff`][u128_abs_diff]
517 - [`usize::abs_diff`][usize_abs_diff]
518 - [`Display for io::ErrorKind`][display_error_kind]
519 - [`From<u8> for ExitCode`][from_u8_exit_code]
520 - [`Not for !` (the "never" type)][not_never]
521 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
522 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
526 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
527 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
528 - [Stabilize namespaced and weak dependency features.][cargo/10269]
529 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
530 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
534 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
535 - [Drop rustc-docs from complete profile][93742]
536 - [bootstrap: tidy up flag handling for llvm build][93918]
540 - [Remove compiler-rt linking hack on Android][83822]
541 - [Mitigations for platforms with non-monotonic clocks have been removed from
542 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
543 instant is not guaranteed to be greater than an earlier instant anymore.
544 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
545 saturating to `0` instead][89926]. In the real world the panic happened mostly
546 on platforms with buggy monotonic clock implementations rather than catching
547 programming errors like reversing the start and end times. Such programming
548 errors will now results in `0` rather than a panic.
549 - In a future release we're planning to increase the baseline requirements for
550 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
551 your feedback in [PR #95026][95026].
556 These changes provide no direct user facing benefits, but represent significant
557 improvements to the internals and overall performance of rustc
560 - [Switch all libraries to the 2021 edition][92068]
562 [83822]: https://github.com/rust-lang/rust/pull/83822
563 [86374]: https://github.com/rust-lang/rust/pull/86374
564 [87487]: https://github.com/rust-lang/rust/pull/87487
565 [89621]: https://github.com/rust-lang/rust/pull/89621
566 [89926]: https://github.com/rust-lang/rust/pull/89926
567 [90132]: https://github.com/rust-lang/rust/pull/90132
568 [90247]: https://github.com/rust-lang/rust/pull/90247
569 [91606]: https://github.com/rust-lang/rust/pull/91606
570 [92068]: https://github.com/rust-lang/rust/pull/92068
571 [92300]: https://github.com/rust-lang/rust/pull/92300
572 [92357]: https://github.com/rust-lang/rust/pull/92357
573 [92383]: https://github.com/rust-lang/rust/pull/92383
574 [92630]: https://github.com/rust-lang/rust/pull/92630
575 [92670]: https://github.com/rust-lang/rust/pull/92670
576 [92800]: https://github.com/rust-lang/rust/pull/92800
577 [92933]: https://github.com/rust-lang/rust/pull/92933
578 [93566]: https://github.com/rust-lang/rust/pull/93566
579 [93577]: https://github.com/rust-lang/rust/pull/93577
580 [93658]: https://github.com/rust-lang/rust/pull/93658
581 [93742]: https://github.com/rust-lang/rust/pull/93742
582 [93824]: https://github.com/rust-lang/rust/pull/93824
583 [93918]: https://github.com/rust-lang/rust/pull/93918
584 [95026]: https://github.com/rust-lang/rust/pull/95026
586 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
587 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
588 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
589 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
590 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
592 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
593 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
594 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
595 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
596 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
597 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
598 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
599 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
600 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
601 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
602 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
603 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
604 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
605 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
606 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
607 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
608 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
609 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
610 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
611 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
612 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
613 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
614 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
615 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
616 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
618 Version 1.59.0 (2022-02-24)
619 ==========================
624 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
625 - [Stabilize destructuring assignment][90521]
626 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
627 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
632 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
633 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
634 - [Fix sparc64 ABI for aggregates with floating point members][91003]
635 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
636 - [Add support for riscv64gc-unknown-freebsd][91284]
637 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
638 - [Soft disable incremental compilation][94124]
640 This release disables incremental compilation, unless the user has explicitly
641 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
642 This is due to a known and relatively frequently occurring bug in incremental
643 compilation, which causes builds to issue internal compiler errors. This
644 particular bug is already fixed on nightly, but that fix has not yet rolled out
645 to stable and is deemed too risky for a direct stable backport.
647 As always, we encourage users to test with nightly and report bugs so that we
648 can track failures and fix issues earlier.
650 See [94124] for more details.
652 [94124]: https://github.com/rust-lang/rust/issues/94124
657 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
662 - [`std::thread::available_parallelism`][available_parallelism]
663 - [`Result::copied`][result-copied]
664 - [`Result::cloned`][result-cloned]
665 - [`arch::asm!`][asm]
666 - [`arch::global_asm!`][global_asm]
667 - [`ops::ControlFlow::is_break`][is_break]
668 - [`ops::ControlFlow::is_continue`][is_continue]
669 - [`TryFrom<char> for u8`][try_from_char_u8]
670 - [`char::TryFromCharError`][try_from_char_err]
671 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
673 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
674 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
675 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
676 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
677 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
678 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
679 - [`DoubleEndedIterator for ToLowercase`][lowercase]
680 - [`DoubleEndedIterator for ToUppercase`][uppercase]
681 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
682 - [`UnwindSafe for Once`][unwindsafe_once]
683 - [`RefUnwindSafe for Once`][refunwindsafe_once]
684 - [armv8 neon intrinsics for aarch64][stdarch/1266]
688 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
689 - [`mem::MaybeUninit::assume_init`][muninit_init]
690 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
691 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
696 - [Stabilize the `strip` profile option][cargo/10088]
697 - [Stabilize future-incompat-report][cargo/10165]
698 - [Support abbreviating `--release` as `-r`][cargo/10133]
699 - [Support `term.quiet` configuration][cargo/10152]
700 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
705 - [Refactor weak symbols in std::sys::unix][90846]
706 This may add new, versioned, symbols when building with a newer glibc, as the
707 standard library uses weak linkage rather than dynamically attempting to load
708 certain symbols at runtime.
709 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
710 This adds a future compatibility lint to supporting the use of cfg_attr
711 wrapping either crate_type or crate_name specification within Rust files;
712 it is recommended that users migrate to setting the equivalent command line
714 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
715 This may expose new names, leading to conflicts with preexisting names in a
716 given namespace and a compilation failure.
717 - [Cargo will document libraries before binaries.][cargo/10172]
718 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
719 - [Weaken guarantee around advancing underlying iterators in zip][83791]
720 - [Make split_inclusive() on an empty slice yield an empty output][89825]
721 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
722 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
727 These changes provide no direct user facing benefits, but represent significant
728 improvements to the internals and overall performance of rustc
731 - [Fix many cases of normalization-related ICEs][91255]
732 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
733 - [Store liveness in interval sets for region inference][90637]
735 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
736 unstable feature.][91867]
738 [91867]: https://github.com/rust-lang/rust/issues/91867
739 [83744]: https://github.com/rust-lang/rust/pull/83744/
740 [83791]: https://github.com/rust-lang/rust/pull/83791/
741 [85013]: https://github.com/rust-lang/rust/pull/85013/
742 [89825]: https://github.com/rust-lang/rust/pull/89825/
743 [89999]: https://github.com/rust-lang/rust/pull/89999/
744 [90128]: https://github.com/rust-lang/rust/pull/90128/
745 [90207]: https://github.com/rust-lang/rust/pull/90207/
746 [90521]: https://github.com/rust-lang/rust/pull/90521/
747 [90586]: https://github.com/rust-lang/rust/pull/90586/
748 [90637]: https://github.com/rust-lang/rust/pull/90637/
749 [90833]: https://github.com/rust-lang/rust/pull/90833/
750 [90846]: https://github.com/rust-lang/rust/pull/90846/
751 [91003]: https://github.com/rust-lang/rust/pull/91003/
752 [91172]: https://github.com/rust-lang/rust/pull/91172/
753 [91255]: https://github.com/rust-lang/rust/pull/91255/
754 [91284]: https://github.com/rust-lang/rust/pull/91284/
755 [91535]: https://github.com/rust-lang/rust/pull/91535/
756 [91593]: https://github.com/rust-lang/rust/pull/91593/
757 [91728]: https://github.com/rust-lang/rust/pull/91728/
758 [91878]: https://github.com/rust-lang/rust/pull/91878/
759 [91896]: https://github.com/rust-lang/rust/pull/91896/
760 [91926]: https://github.com/rust-lang/rust/pull/91926/
761 [91984]: https://github.com/rust-lang/rust/pull/91984/
762 [92020]: https://github.com/rust-lang/rust/pull/92020/
763 [92034]: https://github.com/rust-lang/rust/pull/92034/
764 [92137]: https://github.com/rust-lang/rust/pull/92137/
765 [92483]: https://github.com/rust-lang/rust/pull/92483/
766 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
767 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
768 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
769 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
770 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
771 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
772 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
773 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
775 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
776 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
777 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
778 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
779 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
780 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
781 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
782 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
783 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
784 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
785 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
786 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
787 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
788 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
789 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
790 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
791 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
792 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
793 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
794 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
795 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
796 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
797 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
798 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
799 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
800 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
802 Version 1.58.1 (2022-01-19)
803 ===========================
805 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
806 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
807 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
808 * [Fix wrong error message displayed when some imports are missing][91254]
809 * [Fix rustfmt not formatting generated files from stdin][92912]
811 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
812 [91254]: https://github.com/rust-lang/rust/pull/91254
813 [92912]: https://github.com/rust-lang/rust/pull/92912
814 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
815 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
817 Version 1.58.0 (2022-01-13)
818 ==========================
823 - [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.
824 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
825 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
830 - [Add LLVM CFI support to the Rust compiler][89652]
831 - [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.
832 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
833 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
834 - [Update the minimum external LLVM to 12][90175]
835 - [Add `x86_64-unknown-none` at Tier 3*][89062]
836 - [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.
837 - [Don't abort compilation after giving a lint error][87337]
838 - [Error messages point at the source of trait bound obligations in more places][89580]
840 \* Refer to Rust's [platform support page][platform-support-doc] for more
841 information on Rust's tiered platform support.
846 - [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.
847 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
848 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
849 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
850 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
851 - [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).
856 - [`Metadata::is_symlink`]
857 - [`Path::is_symlink`]
858 - [`{integer}::saturating_div`]
859 - [`Option::unwrap_unchecked`]
860 - [`Result::unwrap_unchecked`]
861 - [`Result::unwrap_err_unchecked`]
864 These APIs are now usable in const contexts:
867 - [`Duration::checked_add`]
868 - [`Duration::saturating_add`]
869 - [`Duration::checked_sub`]
870 - [`Duration::saturating_sub`]
871 - [`Duration::checked_mul`]
872 - [`Duration::saturating_mul`]
873 - [`Duration::checked_div`]
878 - [Add --message-format for install command][cargo/10107]
879 - [Warn when alias shadows external subcommand][cargo/10082]
884 - [Show all Deref implementations recursively in rustdoc][90183]
885 - [Use computed visibility in rustdoc][88447]
890 - [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.
891 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
892 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
893 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
894 - [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.
895 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
900 These changes provide no direct user facing benefits, but represent significant
901 improvements to the internals and overall performance of rustc
904 - [Implement coherence checks for negative trait impls][90104]
905 - [Add rustc lint, warning when iterating over hashmaps][89558]
906 - [Optimize live point computation][90491]
907 - [Enable verification for 1/32nd of queries loaded from disk][90361]
908 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
910 [87337]: https://github.com/rust-lang/rust/pull/87337/
911 [87467]: https://github.com/rust-lang/rust/pull/87467/
912 [87704]: https://github.com/rust-lang/rust/pull/87704/
913 [88041]: https://github.com/rust-lang/rust/pull/88041/
914 [88447]: https://github.com/rust-lang/rust/pull/88447/
915 [88601]: https://github.com/rust-lang/rust/pull/88601/
916 [89062]: https://github.com/rust-lang/rust/pull/89062/
917 [89174]: https://github.com/rust-lang/rust/pull/89174/
918 [89551]: https://github.com/rust-lang/rust/pull/89551/
919 [89558]: https://github.com/rust-lang/rust/pull/89558/
920 [89580]: https://github.com/rust-lang/rust/pull/89580/
921 [89652]: https://github.com/rust-lang/rust/pull/89652/
922 [90041]: https://github.com/rust-lang/rust/pull/90041/
923 [90058]: https://github.com/rust-lang/rust/pull/90058/
924 [90104]: https://github.com/rust-lang/rust/pull/90104/
925 [90117]: https://github.com/rust-lang/rust/pull/90117/
926 [90175]: https://github.com/rust-lang/rust/pull/90175/
927 [90183]: https://github.com/rust-lang/rust/pull/90183/
928 [90297]: https://github.com/rust-lang/rust/pull/90297/
929 [90329]: https://github.com/rust-lang/rust/pull/90329/
930 [90361]: https://github.com/rust-lang/rust/pull/90361/
931 [90417]: https://github.com/rust-lang/rust/pull/90417/
932 [90473]: https://github.com/rust-lang/rust/pull/90473/
933 [90491]: https://github.com/rust-lang/rust/pull/90491/
934 [90733]: https://github.com/rust-lang/rust/pull/90733/
935 [90833]: https://github.com/rust-lang/rust/pull/90833/
936 [90846]: https://github.com/rust-lang/rust/pull/90846/
937 [91026]: https://github.com/rust-lang/rust/pull/91026/
938 [91207]: https://github.com/rust-lang/rust/pull/91207/
939 [91255]: https://github.com/rust-lang/rust/pull/91255/
940 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
941 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
942 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
943 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
944 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
945 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
946 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
947 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
948 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
949 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
951 Version 1.57.0 (2021-12-02)
952 ==========================
957 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
958 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
959 - [Allow panicking in constant evaluation.][89508]
960 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
965 - [Create more accurate debuginfo for vtables.][89597]
966 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
967 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
968 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
969 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
971 \* Refer to Rust's [platform support page][platform-support-doc] for more
972 information on Rust's tiered platform support.
977 - [Avoid allocations and copying in `Vec::leak`][89337]
978 - [Add `#[repr(i8)]` to `Ordering`][89507]
979 - [Optimize `File::read_to_end` and `read_to_string`][89582]
980 - [Update to Unicode 14.0][89614]
981 - [Many more functions are marked `#[must_use]`][89692], producing a warning
982 when ignoring their return value. This helps catch mistakes such as expecting
983 a function to mutate a value in place rather than return a new value.
988 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
989 - [`[T; N]::as_slice`][`array::as_slice`]
990 - [`collections::TryReserveError`]
991 - [`HashMap::try_reserve`]
992 - [`HashSet::try_reserve`]
993 - [`String::try_reserve`]
994 - [`String::try_reserve_exact`]
995 - [`Vec::try_reserve`]
996 - [`Vec::try_reserve_exact`]
997 - [`VecDeque::try_reserve`]
998 - [`VecDeque::try_reserve_exact`]
999 - [`Iterator::map_while`]
1000 - [`iter::MapWhile`]
1001 - [`proc_macro::is_available`]
1002 - [`Command::get_program`]
1003 - [`Command::get_args`]
1004 - [`Command::get_envs`]
1005 - [`Command::get_current_dir`]
1009 These APIs are now usable in const contexts:
1011 - [`hint::unreachable_unchecked`]
1016 - [Stabilize custom profiles][cargo/9943]
1021 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1022 This will break some builds that set `#![deny(dead_code)]`.
1026 These changes provide no direct user facing benefits, but represent significant
1027 improvements to the internals and overall performance of rustc
1030 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1032 [85200]: https://github.com/rust-lang/rust/pull/85200/
1033 [86191]: https://github.com/rust-lang/rust/pull/86191/
1034 [87220]: https://github.com/rust-lang/rust/pull/87220/
1035 [87260]: https://github.com/rust-lang/rust/pull/87260/
1036 [88321]: https://github.com/rust-lang/rust/pull/88321/
1037 [88529]: https://github.com/rust-lang/rust/pull/88529/
1038 [88690]: https://github.com/rust-lang/rust/pull/88690/
1039 [88952]: https://github.com/rust-lang/rust/pull/88952/
1040 [89337]: https://github.com/rust-lang/rust/pull/89337/
1041 [89507]: https://github.com/rust-lang/rust/pull/89507/
1042 [89508]: https://github.com/rust-lang/rust/pull/89508/
1043 [89582]: https://github.com/rust-lang/rust/pull/89582/
1044 [89597]: https://github.com/rust-lang/rust/pull/89597/
1045 [89614]: https://github.com/rust-lang/rust/pull/89614/
1046 [89692]: https://github.com/rust-lang/rust/issues/89692/
1047 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1048 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1049 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1050 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1051 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1052 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1053 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1054 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1055 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1056 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1057 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1058 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1059 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1060 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1061 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1062 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1063 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1064 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1065 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1066 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1067 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1069 Version 1.56.1 (2021-11-01)
1070 ===========================
1072 - New lints to detect the presence of bidirectional-override Unicode
1073 codepoints in the compiled source code ([CVE-2021-42574])
1075 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1077 Version 1.56.0 (2021-10-21)
1078 ========================
1083 - [The 2021 Edition is now stable.][rust#88100]
1084 See [the edition guide][rust-2021-edition-guide] for more details.
1085 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1086 - [Union field access is permitted in `const fn`.][rust#85769]
1088 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1093 - [Upgrade to LLVM 13.][rust#87570]
1094 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1095 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1096 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1097 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1098 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1099 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1100 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1102 \* Refer to Rust's [platform support page][platform-support-doc] for more
1103 information on Rust's tiered platform support.
1108 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1109 The Windows console still requires valid Unicode, but this change allows
1110 splitting a UTF-8 character across multiple write calls. This allows, for
1111 instance, programs that just read and write data buffers (e.g. copying a file
1112 to stdout) without regard for Unicode or character boundaries.
1113 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1114 For this use case, atomics scale much better under contention.
1115 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1116 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1117 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1118 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1119 - [Treat invalid environment variable names as non-existent.][rust#86183]
1120 Previously, the environment functions would panic if given a variable name
1121 with an internal null character or equal sign (`=`). Now, these functions will
1122 just treat such names as non-existent variables, since the OS cannot represent
1123 the existence of a variable with such a name.
1128 - [`std::os::unix::fs::chroot`]
1129 - [`UnsafeCell::raw_get`]
1130 - [`BufWriter::into_parts`]
1131 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1132 These APIs were previously stable in `std`, but are now also available in `core`.
1133 - [`Vec::shrink_to`]
1134 - [`String::shrink_to`]
1135 - [`OsString::shrink_to`]
1136 - [`PathBuf::shrink_to`]
1137 - [`BinaryHeap::shrink_to`]
1138 - [`VecDeque::shrink_to`]
1139 - [`HashMap::shrink_to`]
1140 - [`HashSet::shrink_to`]
1142 These APIs are now usable in const contexts:
1144 - [`std::mem::transmute`]
1145 - [`[T]::first`][`slice::first`]
1146 - [`[T]::split_first`][`slice::split_first`]
1147 - [`[T]::last`][`slice::last`]
1148 - [`[T]::split_last`][`slice::split_last`]
1153 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1154 This has no effect at present on dependency version selection.
1155 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1156 that support Rust code to include a crate's specified minimum version in the test matrix for that
1162 - [Update to new argument parsing rules on Windows.][rust#87580]
1163 This adjusts Rust's standard library to match the behavior of the standard
1164 libraries for C/C++. The rules have changed slightly over time, and this PR
1165 brings us to the latest set of rules (changed in 2008).
1166 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1167 This was already not supported by LLVM; this change surfaces this lack of
1168 support with a better error message.
1169 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1170 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1171 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1172 may return different values on glibc <= 2.24.][rust#81825]
1173 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1174 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1175 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1176 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1180 These changes provide no direct user facing benefits, but represent significant
1181 improvements to the internals and overall performance of rustc
1184 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1185 This improves the performance of most Rust builds.
1186 - [Unify representation of macros in internal data structures.][rust#88019]
1187 This change fixes a host of bugs with the handling of macros by the compiler,
1190 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1191 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1192 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1193 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1194 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1195 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1196 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1197 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1198 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1199 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1200 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1201 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1202 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1203 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1204 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1205 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1206 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1207 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1208 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1209 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1210 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1211 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1212 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1213 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1214 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1215 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1216 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1217 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1218 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1219 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1220 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1221 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1222 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1223 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1224 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1225 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1226 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1227 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1228 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1229 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1230 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1231 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1233 Version 1.55.0 (2021-09-09)
1234 ============================
1238 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1239 will end at the maximum value of the integer.][83918]
1240 - [You can now explicitly import the prelude of different editions
1241 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1245 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1247 \* Refer to Rust's [platform support page][platform-support-doc] for more
1248 information on Rust's tiered platform support.
1253 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1254 These improvements should in general provide faster string parsing of floats,
1255 no longer reject certain valid floating point values, and reduce
1256 the produced code size for non-stripped artifacts.
1257 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1264 - [`IntoInnerError::into_error`]
1265 - [`IntoInnerError::into_parts`]
1266 - [`MaybeUninit::assume_init_mut`]
1267 - [`MaybeUninit::assume_init_ref`]
1268 - [`MaybeUninit::write`]
1270 - [`ops::ControlFlow`]
1272 - [`x86::_bittestandcomplement`]
1273 - [`x86::_bittestandreset`]
1274 - [`x86::_bittestandset`]
1275 - [`x86_64::_bittest64`]
1276 - [`x86_64::_bittestandcomplement64`]
1277 - [`x86_64::_bittestandreset64`]
1278 - [`x86_64::_bittestandset64`]
1280 The following previously stable functions are now `const`.
1282 - [`str::from_utf8_unchecked`]
1287 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1288 rustc in parallel such as when using `cargo test`.][cargo/9675]
1289 - [The package definition in `cargo metadata` now includes the `"default_run"`
1290 field from the manifest.][cargo/9550]
1291 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1292 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1293 of packages.][cargo/9663]
1297 - [Added "Go to item on exact match" search option.][85876]
1298 - [The "Implementors" section on traits no longer shows redundant
1299 method definitions.][85970]
1300 - [Trait implementations are toggled open by default.][86260] This should make the
1301 implementations more searchable by tools like `CTRL+F` in your browser.
1302 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1303 through type aliases.][86334]
1304 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1305 "Trait Implementations" section.][86513]
1310 - [std functions that return an `io::Error` will no longer use the
1311 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1312 kinds of errors could be categorised [into newer more specific `ErrorKind`
1313 variants][79965], and that they do not represent a user error.
1314 - [Using environment variable names with `process::Command` on Windows now
1315 behaves as expected.][85270] Previously using envionment variables with
1316 `Command` would cause them to be ASCII-uppercased.
1317 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1318 with `rustdoc::`][86849]
1319 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1320 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1321 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1324 [86849]: https://github.com/rust-lang/rust/pull/86849
1325 [86513]: https://github.com/rust-lang/rust/pull/86513
1326 [86334]: https://github.com/rust-lang/rust/pull/86334
1327 [86260]: https://github.com/rust-lang/rust/pull/86260
1328 [85970]: https://github.com/rust-lang/rust/pull/85970
1329 [85876]: https://github.com/rust-lang/rust/pull/85876
1330 [83572]: https://github.com/rust-lang/rust/pull/83572
1331 [86294]: https://github.com/rust-lang/rust/pull/86294
1332 [86858]: https://github.com/rust-lang/rust/pull/86858
1333 [86761]: https://github.com/rust-lang/rust/pull/86761
1334 [85746]: https://github.com/rust-lang/rust/pull/85746
1335 [85270]: https://github.com/rust-lang/rust/pull/85270
1336 [83918]: https://github.com/rust-lang/rust/pull/83918
1337 [79965]: https://github.com/rust-lang/rust/pull/79965
1338 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1339 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1340 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1341 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1342 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1343 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1344 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1345 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1346 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1347 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1348 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1349 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1350 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1351 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1352 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1353 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1354 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1355 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1356 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1357 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1358 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1359 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1362 Version 1.54.0 (2021-07-29)
1363 ============================
1366 -----------------------
1368 - [You can now use macros for values in some built-in attributes.][83366]
1369 This primarily allows you to call macros within the `#[doc]` attribute. For
1370 example, to include external documentation in your crate, you can now write
1373 #![doc = include_str!("README.md")]
1376 - [You can now cast between unsized slice types (and types which contain
1377 unsized slices) in `const fn`.][85078]
1378 - [You can now use multiple generic lifetimes with `impl Trait` where the
1379 lifetimes don't explicitly outlive another.][84701] In code this means
1380 that you can now have `impl Trait<'a, 'b>` where as before you could
1381 only have `impl Trait<'a, 'b> where 'b: 'a`.
1384 -----------------------
1386 - [Rustc will now search for custom JSON targets in
1387 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1388 directory.][83800] You can find your sysroot directory by running
1389 `rustc --print sysroot`.
1390 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1391 - [You can now use `#[target_feature]` on safe functions when targeting
1392 WebAssembly platforms.][84988]
1393 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1394 - [Added tier 3\* support for `bpfel-unknown-none`
1395 and `bpfeb-unknown-none`.][79608]
1396 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1398 \* Refer to Rust's [platform support page][platform-support-doc] for more
1399 information on Rust's tiered platform support.
1402 -----------------------
1404 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1405 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1406 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1407 - [The implementations of vendor intrinsics in core::arch have been
1408 significantly refactored.][83278] The main user-visible changes are
1409 a 50% reduction in the size of libcore.rlib and stricter validation
1410 of constant operands passed to intrinsics. The latter is technically
1411 a breaking change, but allows Rust to more closely match the C vendor
1417 - [`BTreeMap::into_keys`]
1418 - [`BTreeMap::into_values`]
1419 - [`HashMap::into_keys`]
1420 - [`HashMap::into_values`]
1422 - [`VecDeque::binary_search`]
1423 - [`VecDeque::binary_search_by`]
1424 - [`VecDeque::binary_search_by_key`]
1425 - [`VecDeque::partition_point`]
1430 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1431 the dependency graph.][cargo/9520]
1432 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1433 in the tree ][cargo/9499]
1434 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1435 macro dependencies.][cargo/9488]
1436 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1437 This variable points to a directory that integration tests and benches
1438 can use as a "scratchpad" for testing filesystem operations.
1442 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1443 - [Previously unsound code is no longer permitted where different constructors in branches
1444 could require different lifetimes.][85574]
1445 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
1446 than before and may reject some previously accepted code.
1447 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1448 when compiled with `codegen-units = 1`.][86063]
1450 [85574]: https://github.com/rust-lang/rust/issues/85574
1451 [86831]: https://github.com/rust-lang/rust/issues/86831
1452 [86063]: https://github.com/rust-lang/rust/issues/86063
1453 [79608]: https://github.com/rust-lang/rust/pull/79608
1454 [84988]: https://github.com/rust-lang/rust/pull/84988
1455 [84701]: https://github.com/rust-lang/rust/pull/84701
1456 [84072]: https://github.com/rust-lang/rust/pull/84072
1457 [85745]: https://github.com/rust-lang/rust/pull/85745
1458 [84744]: https://github.com/rust-lang/rust/pull/84744
1459 [85078]: https://github.com/rust-lang/rust/pull/85078
1460 [84717]: https://github.com/rust-lang/rust/pull/84717
1461 [83800]: https://github.com/rust-lang/rust/pull/83800
1462 [83366]: https://github.com/rust-lang/rust/pull/83366
1463 [83278]: https://github.com/rust-lang/rust/pull/83278
1464 [85292]: https://github.com/rust-lang/rust/pull/85292
1465 [82834]: https://github.com/rust-lang/rust/pull/82834
1466 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1467 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1468 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1469 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1470 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1471 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1472 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1473 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1474 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1475 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1476 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1478 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1480 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1482 Version 1.53.0 (2021-06-17)
1483 ============================
1486 -----------------------
1487 - [You can now use unicode for identifiers.][83799] This allows multilingual
1488 identifiers but still doesn't allow glyphs that are not considered characters
1489 such as `◆` or `🦀`. More specifically you can now use any identifier that
1490 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1491 is the same standard as languages like Python, however Rust uses NFC
1492 normalization which may be different from other languages.
1493 - [You can now specify "or patterns" inside pattern matches.][79278]
1494 Previously you could only use `|` (OR) on complete patterns. E.g.
1498 matches!(x, Some(1) | Some(2));
1500 matches!(x, Some(1 | 2));
1502 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1503 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1504 to change semantics to being a pattern fragment in a future edition.
1507 -----------------------
1508 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1509 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1510 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1512 \* Refer to Rust's [platform support page][platform-support-doc] for more
1513 information on Rust's tiered platform support.
1516 -----------------------
1517 - [Abort messages will now forward to `android_set_abort_message` on
1518 Android platforms when available.][81469]
1519 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1520 - [Arrays of any length now implement `IntoIterator`.][84147]
1521 Currently calling `.into_iter()` as a method on an array will
1522 return `impl Iterator<Item=&T>`, but this may change in a
1523 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1524 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1525 - [`leading_zeros`, and `trailing_zeros` are now available on all
1526 `NonZero` integer types.][84082]
1527 - [`{f32, f64}::from_str` now parse and print special values
1528 (`NaN`, `-0`) according to IEEE 754.][78618]
1529 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1530 - [Add the `BITS` associated constant to all numeric types.][82565]
1534 - [`AtomicBool::fetch_update`]
1535 - [`AtomicPtr::fetch_update`]
1536 - [`BTreeMap::retain`]
1537 - [`BTreeSet::retain`]
1538 - [`BufReader::seek_relative`]
1539 - [`DebugStruct::non_exhaustive`]
1541 - [`Duration::ZERO`]
1542 - [`Duration::is_zero`]
1543 - [`Duration::saturating_add`]
1544 - [`Duration::saturating_mul`]
1545 - [`Duration::saturating_sub`]
1546 - [`ErrorKind::Unsupported`]
1547 - [`Option::insert`]
1548 - [`Ordering::is_eq`]
1549 - [`Ordering::is_ge`]
1550 - [`Ordering::is_gt`]
1551 - [`Ordering::is_le`]
1552 - [`Ordering::is_lt`]
1553 - [`Ordering::is_ne`]
1554 - [`OsStr::is_ascii`]
1555 - [`OsStr::make_ascii_lowercase`]
1556 - [`OsStr::make_ascii_uppercase`]
1557 - [`OsStr::to_ascii_lowercase`]
1558 - [`OsStr::to_ascii_uppercase`]
1559 - [`Peekable::peek_mut`]
1560 - [`Rc::decrement_strong_count`]
1561 - [`Rc::increment_strong_count`]
1562 - [`Vec::extend_from_within`]
1563 - [`array::from_mut`]
1564 - [`array::from_ref`]
1565 - [`cmp::max_by_key`]
1567 - [`cmp::min_by_key`]
1569 - [`f32::is_subnormal`]
1570 - [`f64::is_subnormal`]
1573 -----------------------
1574 - [Cargo now supports git repositories where the default `HEAD` branch is not
1575 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1576 which can handle default branches correctly.
1577 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1578 - [The `authors` field is no longer included in `Cargo.toml` for new
1579 projects.][cargo/9282]
1582 -----------------------
1583 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1584 without hyperlinks.][81764]
1588 - [Implement token-based handling of attributes during expansion][82608]
1589 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1590 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1591 to confusion and potential security vulnerabilities and [is no
1592 longer recommended][ietf6943].
1593 - [The added `BITS` constant may conflict with external definitions.][85667]
1594 In particular, this was known to be a problem in the `lexical-core` crate,
1595 but they have published fixes for semantic versions 0.4 through 0.7. To
1596 update this dependency alone, use `cargo update -p lexical-core`.
1597 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1601 These changes provide no direct user facing benefits, but represent significant
1602 improvements to the internals and overall performance of rustc and
1605 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1606 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1607 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1608 - [Rework rustdoc const type][82873]
1610 [85667]: https://github.com/rust-lang/rust/pull/85667
1611 [83386]: https://github.com/rust-lang/rust/pull/83386
1612 [82771]: https://github.com/rust-lang/rust/pull/82771
1613 [84147]: https://github.com/rust-lang/rust/pull/84147
1614 [84082]: https://github.com/rust-lang/rust/pull/84082
1615 [83799]: https://github.com/rust-lang/rust/pull/83799
1616 [83681]: https://github.com/rust-lang/rust/pull/83681
1617 [83652]: https://github.com/rust-lang/rust/pull/83652
1618 [83387]: https://github.com/rust-lang/rust/pull/83387
1619 [82873]: https://github.com/rust-lang/rust/pull/82873
1620 [82864]: https://github.com/rust-lang/rust/pull/82864
1621 [82608]: https://github.com/rust-lang/rust/pull/82608
1622 [82565]: https://github.com/rust-lang/rust/pull/82565
1623 [80525]: https://github.com/rust-lang/rust/pull/80525
1624 [79278]: https://github.com/rust-lang/rust/pull/79278
1625 [78618]: https://github.com/rust-lang/rust/pull/78618
1626 [77704]: https://github.com/rust-lang/rust/pull/77704
1627 [83941]: https://github.com/rust-lang/rust/pull/83941
1628 [83065]: https://github.com/rust-lang/rust/pull/83065
1629 [81764]: https://github.com/rust-lang/rust/pull/81764
1630 [81469]: https://github.com/rust-lang/rust/pull/81469
1631 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1632 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1633 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1634 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1635 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1636 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1637 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1638 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1639 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1640 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1641 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1642 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1643 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1644 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1645 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1646 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1647 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1648 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1649 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1650 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1651 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1652 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1653 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1654 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1655 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1656 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1657 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1658 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1659 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1660 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1661 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1662 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1663 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1664 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1665 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1666 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1667 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1668 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1669 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1670 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1671 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1674 Version 1.52.1 (2021-05-10)
1675 ============================
1677 This release disables incremental compilation, unless the user has explicitly
1678 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1680 This is due to the widespread, and frequently occurring, breakage encountered by
1681 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1682 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1683 newly added incremental verification are still present in past stable versions,
1684 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1687 These problems only affect incremental builds, so release builds with Cargo
1688 should not be affected unless the user has explicitly opted into incremental.
1689 Debug and check builds are affected.
1691 See [84970] for more details.
1693 [84970]: https://github.com/rust-lang/rust/issues/84970
1695 Version 1.52.0 (2021-05-06)
1696 ============================
1700 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1701 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1702 is allowed by default, and may become a warning or hard error in a
1704 - [You can now cast mutable references to arrays to a pointer of the same type as
1705 the element.][81479]
1709 - [Upgraded the default LLVM to LLVM 12.][81451]
1711 Added tier 3\* support for the following targets.
1713 - [`s390x-unknown-linux-musl`][82166]
1714 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1715 - [`powerpc-unknown-openbsd`][82733]
1717 \* Refer to Rust's [platform support page][platform-support-doc] for more
1718 information on Rust's tiered platform support.
1722 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1723 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1724 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1725 - [All integer division and remainder operations are now `const`.][80962]
1729 - [`Arguments::as_str`]
1731 - [`char::REPLACEMENT_CHARACTER`]
1732 - [`char::UNICODE_VERSION`]
1733 - [`char::decode_utf16`]
1734 - [`char::from_digit`]
1735 - [`char::from_u32_unchecked`]
1736 - [`char::from_u32`]
1737 - [`slice::partition_point`]
1738 - [`str::rsplit_once`]
1739 - [`str::split_once`]
1741 The following previously stable APIs are now `const`.
1743 - [`char::len_utf8`]
1744 - [`char::len_utf16`]
1745 - [`char::to_ascii_uppercase`]
1746 - [`char::to_ascii_lowercase`]
1747 - [`char::eq_ignore_ascii_case`]
1748 - [`u8::to_ascii_uppercase`]
1749 - [`u8::to_ascii_lowercase`]
1750 - [`u8::eq_ignore_ascii_case`]
1754 - [Rustdoc lints are now treated as a tool lint, meaning that
1755 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1756 Using the old style is still allowed, and will become a warning in
1758 - [Rustdoc now supports argument files.][82261]
1759 - [Rustdoc now generates smart punctuation for documentation.][79423]
1760 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1768 - [You can now pass multiple filters to tests.][81356] E.g.
1769 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1770 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1771 allowing you to see `std` symbols when debugging.][82218]
1775 These changes provide no direct user facing benefits, but represent significant
1776 improvements to the internals and overall performance of rustc and
1779 - [Check the result cache before the DepGraph when ensuring queries][81855]
1780 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1781 - [Only store a LocalDefId in some HIR nodes][81611]
1782 - [Store HIR attributes in a side table][79519]
1786 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1787 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1788 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1789 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1790 languages in code blocks.][78429]
1791 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1792 - [Changes in how proc macros handle whitespace may lead to panics when used
1793 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1794 - [Turn `#[derive]` into a regular macro attribute][79078]
1796 [84136]: https://github.com/rust-lang/rust/issues/84136
1797 [80763]: https://github.com/rust-lang/rust/pull/80763
1798 [82166]: https://github.com/rust-lang/rust/pull/82166
1799 [82121]: https://github.com/rust-lang/rust/pull/82121
1800 [81879]: https://github.com/rust-lang/rust/pull/81879
1801 [82261]: https://github.com/rust-lang/rust/pull/82261
1802 [82218]: https://github.com/rust-lang/rust/pull/82218
1803 [82216]: https://github.com/rust-lang/rust/pull/82216
1804 [82202]: https://github.com/rust-lang/rust/pull/82202
1805 [81855]: https://github.com/rust-lang/rust/pull/81855
1806 [81766]: https://github.com/rust-lang/rust/pull/81766
1807 [81744]: https://github.com/rust-lang/rust/pull/81744
1808 [81611]: https://github.com/rust-lang/rust/pull/81611
1809 [81479]: https://github.com/rust-lang/rust/pull/81479
1810 [81451]: https://github.com/rust-lang/rust/pull/81451
1811 [81356]: https://github.com/rust-lang/rust/pull/81356
1812 [80962]: https://github.com/rust-lang/rust/pull/80962
1813 [80553]: https://github.com/rust-lang/rust/pull/80553
1814 [80527]: https://github.com/rust-lang/rust/pull/80527
1815 [79519]: https://github.com/rust-lang/rust/pull/79519
1816 [79423]: https://github.com/rust-lang/rust/pull/79423
1817 [79208]: https://github.com/rust-lang/rust/pull/79208
1818 [78429]: https://github.com/rust-lang/rust/pull/78429
1819 [82733]: https://github.com/rust-lang/rust/pull/82733
1820 [82594]: https://github.com/rust-lang/rust/pull/82594
1821 [79078]: https://github.com/rust-lang/rust/pull/79078
1822 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1823 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1824 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1825 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1826 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1827 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1828 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1829 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1830 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1831 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1832 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1833 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1834 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1835 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1836 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1837 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1838 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1839 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1840 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1841 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1842 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1843 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1845 Version 1.51.0 (2021-03-25)
1846 ============================
1850 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1851 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1852 E.g. you can now write the following. Note: Only values of primitive integers,
1853 `bool`, or `char` types are currently permitted.
1855 struct GenericArray<T, const LENGTH: usize> {
1859 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1860 const fn last(&self) -> Option<&T> {
1864 Some(&self.inner[LENGTH - 1])
1874 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1875 This option controls whether debug information is split across multiple files
1876 or packed into a single file. **Note** This option is unstable on other platforms.
1877 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1878 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1879 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1880 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1882 \* Refer to Rust's [platform support page][platform-support-doc] for more
1883 information on Rust's tiered platform support.
1888 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1889 - [`str` now implements `AsMut<str>`.][80279]
1890 - [`u64` and `u128` now implement `From<char>`.][79502]
1891 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1892 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1893 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1894 - [`io::Empty` now implements `io::Seek`.][78044]
1895 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1896 `T: ?Sized` types.][80764]
1897 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1903 - [`Arc::decrement_strong_count`]
1904 - [`Arc::increment_strong_count`]
1905 - [`Once::call_once_force`]
1906 - [`Peekable::next_if_eq`]
1907 - [`Peekable::next_if`]
1908 - [`Seek::stream_position`]
1909 - [`array::IntoIter`]
1910 - [`panic::panic_any`]
1912 - [`ptr::addr_of_mut!`]
1913 - [`slice::fill_with`]
1914 - [`slice::split_inclusive_mut`]
1915 - [`slice::split_inclusive`]
1916 - [`slice::strip_prefix`]
1917 - [`slice::strip_suffix`]
1918 - [`str::split_inclusive`]
1919 - [`sync::OnceState`]
1921 - [`VecDeque::range`]
1922 - [`VecDeque::range_mut`]
1926 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1927 codegen option.][cargo/9112]
1928 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1929 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1930 to avoid unifying features of dependencies where that unification could be unwanted.
1931 Such as using the same dependency with a `std` feature in a build scripts and
1932 proc-macros, while using the `no-std` feature in the final binary. See the
1933 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1938 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1939 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1940 documentation.][79642]
1942 Various improvements to intra-doc links:
1944 - [You can link to non-path primitives such as `slice`.][80181]
1945 - [You can link to associated items.][74489]
1946 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1950 - [You can now pass `--include-ignored` to tests (e.g. with
1951 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1956 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1957 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1959 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1960 for the distributed artifacts.][81521]
1961 - `armv5te-unknown-linux-gnueabi`
1962 - `sparc64-unknown-linux-gnu`
1963 - `thumbv7neon-unknown-linux-gnueabihf`
1964 - `armv7-unknown-linux-gnueabi`
1965 - `x86_64-unknown-linux-gnux32`
1966 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1971 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1973 [79135]: https://github.com/rust-lang/rust/pull/79135
1974 [74489]: https://github.com/rust-lang/rust/pull/74489
1975 [76934]: https://github.com/rust-lang/rust/pull/76934
1976 [79570]: https://github.com/rust-lang/rust/pull/79570
1977 [80181]: https://github.com/rust-lang/rust/pull/80181
1978 [79642]: https://github.com/rust-lang/rust/pull/79642
1979 [80945]: https://github.com/rust-lang/rust/pull/80945
1980 [80279]: https://github.com/rust-lang/rust/pull/80279
1981 [80053]: https://github.com/rust-lang/rust/pull/80053
1982 [79502]: https://github.com/rust-lang/rust/pull/79502
1983 [75180]: https://github.com/rust-lang/rust/pull/75180
1984 [81521]: https://github.com/rust-lang/rust/pull/81521
1985 [80968]: https://github.com/rust-lang/rust/pull/80968
1986 [80959]: https://github.com/rust-lang/rust/pull/80959
1987 [80718]: https://github.com/rust-lang/rust/pull/80718
1988 [80653]: https://github.com/rust-lang/rust/pull/80653
1989 [80579]: https://github.com/rust-lang/rust/pull/80579
1990 [79998]: https://github.com/rust-lang/rust/pull/79998
1991 [78044]: https://github.com/rust-lang/rust/pull/78044
1992 [81455]: https://github.com/rust-lang/rust/pull/81455
1993 [80764]: https://github.com/rust-lang/rust/pull/80764
1994 [80749]: https://github.com/rust-lang/rust/pull/80749
1995 [80662]: https://github.com/rust-lang/rust/pull/80662
1996 [79134]: https://github.com/rust-lang/rust/pull/79134
1997 [80966]: https://github.com/rust-lang/rust/pull/80966
1998 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1999 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
2000 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
2001 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
2002 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
2003 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2004 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2005 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2006 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2007 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2008 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2009 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2010 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2011 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2012 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2013 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2014 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2015 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2016 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2017 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2018 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2019 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2020 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2022 Version 1.50.0 (2021-02-11)
2023 ============================
2026 -----------------------
2027 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2028 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2029 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2032 -----------------------
2033 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2034 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2035 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2036 - [Dropped support for all cloudabi targets.][78439]
2038 \* Refer to Rust's [platform support page][platform-support-doc] for more
2039 information on Rust's tiered platform support.
2042 -----------------------
2044 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2045 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2046 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2047 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2048 up the same amount of space as `File`.
2054 - [`btree_map::Entry::or_insert_with_key`]
2057 - [`hash_map::Entry::or_insert_with_key`]
2061 - [`UnsafeCell::get_mut`]
2063 The following previously stable methods are now `const`.
2065 - [`IpAddr::is_ipv4`]
2066 - [`IpAddr::is_ipv6`]
2067 - [`IpAddr::is_unspecified`]
2068 - [`IpAddr::is_loopback`]
2069 - [`IpAddr::is_multicast`]
2070 - [`Ipv4Addr::octets`]
2071 - [`Ipv4Addr::is_loopback`]
2072 - [`Ipv4Addr::is_private`]
2073 - [`Ipv4Addr::is_link_local`]
2074 - [`Ipv4Addr::is_multicast`]
2075 - [`Ipv4Addr::is_broadcast`]
2076 - [`Ipv4Addr::is_documentation`]
2077 - [`Ipv4Addr::to_ipv6_compatible`]
2078 - [`Ipv4Addr::to_ipv6_mapped`]
2079 - [`Ipv6Addr::segments`]
2080 - [`Ipv6Addr::is_unspecified`]
2081 - [`Ipv6Addr::is_loopback`]
2082 - [`Ipv6Addr::is_multicast`]
2083 - [`Ipv6Addr::to_ipv4`]
2086 - [`Layout::from_size_align`]
2087 - `pow` for all integer types.
2088 - `checked_pow` for all integer types.
2089 - `saturating_pow` for all integer types.
2090 - `wrapping_pow` for all integer types.
2091 - `next_power_of_two` for all unsigned integer types.
2092 - `checked_next_power_of_two` for all unsigned integer types.
2095 -----------------------
2097 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2098 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2099 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2100 contents of that directory for changes.][cargo/8973]
2101 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2106 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2107 - [Running tests will now print the total time taken to execute.][75752]
2112 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2113 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2114 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2115 unhygenic `macro_rules!` macros.][79472]
2116 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2117 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2118 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2119 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2120 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2121 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2123 [74989]: https://github.com/rust-lang/rust/pull/74989
2124 [79261]: https://github.com/rust-lang/rust/pull/79261
2125 [79896]: https://github.com/rust-lang/rust/pull/79896
2126 [79484]: https://github.com/rust-lang/rust/pull/79484
2127 [79472]: https://github.com/rust-lang/rust/pull/79472
2128 [79270]: https://github.com/rust-lang/rust/pull/79270
2129 [79003]: https://github.com/rust-lang/rust/pull/79003
2130 [78864]: https://github.com/rust-lang/rust/pull/78864
2131 [78636]: https://github.com/rust-lang/rust/pull/78636
2132 [78439]: https://github.com/rust-lang/rust/pull/78439
2133 [78343]: https://github.com/rust-lang/rust/pull/78343
2134 [78296]: https://github.com/rust-lang/rust/pull/78296
2135 [78068]: https://github.com/rust-lang/rust/pull/78068
2136 [75752]: https://github.com/rust-lang/rust/pull/75752
2137 [74699]: https://github.com/rust-lang/rust/pull/74699
2138 [78142]: https://github.com/rust-lang/rust/pull/78142
2139 [77484]: https://github.com/rust-lang/rust/pull/77484
2140 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2141 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2142 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2143 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2144 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2145 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2146 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2147 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2148 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2149 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2150 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2151 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2152 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2153 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2154 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2155 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2156 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2157 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2158 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2159 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2160 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2161 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2162 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2163 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2164 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2165 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2166 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2167 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2168 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2169 [`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
2170 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2171 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2172 [`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
2173 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2176 Version 1.49.0 (2020-12-31)
2177 ============================
2180 -----------------------
2182 - [Unions can now implement `Drop`, and you can now have a field in a union
2183 with `ManuallyDrop<T>`.][77547]
2184 - [You can now cast uninhabited enums to integers.][76199]
2185 - [You can now bind by reference and by move in patterns.][76119] This
2186 allows you to selectively borrow individual components of a type. E.g.
2194 let person = Person {
2195 name: String::from("Alice"),
2199 // `name` is moved out of person, but `age` is referenced.
2200 let Person { name, ref age } = person;
2201 println!("{} {}", name, age);
2205 -----------------------
2207 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2208 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2209 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2210 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2211 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2212 - [Output from threads spawned in tests is now captured.][78227]
2213 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2215 \* Refer to Rust's [platform support page][platform-support-doc] for more
2216 information on Rust's tiered platform support.
2219 -----------------------
2221 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2222 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2227 - [`slice::select_nth_unstable`]
2228 - [`slice::select_nth_unstable_by`]
2229 - [`slice::select_nth_unstable_by_key`]
2231 The following previously stable methods are now `const`.
2233 - [`Poll::is_ready`]
2234 - [`Poll::is_pending`]
2237 -----------------------
2238 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2239 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2240 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2241 variable will be set if the crate being built is one the user selected to build, either
2242 with `-p` or through defaults.
2243 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2249 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2250 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2251 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2252 Previously such invalid or unused attributes could be ignored.
2253 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2254 read [this post about the changes][rustdoc-ws-post] for more details.
2255 - [Trait bounds are no longer inferred for associated types.][79904]
2259 These changes provide no direct user facing benefits, but represent significant
2260 improvements to the internals and overall performance of rustc and
2263 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2264 Local Storage model.][78201]
2265 - [Calculate visibilities once in resolve.][78077]
2266 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2267 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2270 [75991]: https://github.com/rust-lang/rust/pull/75991
2271 [78951]: https://github.com/rust-lang/rust/pull/78951
2272 [78848]: https://github.com/rust-lang/rust/pull/78848
2273 [78746]: https://github.com/rust-lang/rust/pull/78746
2274 [78376]: https://github.com/rust-lang/rust/pull/78376
2275 [78228]: https://github.com/rust-lang/rust/pull/78228
2276 [78227]: https://github.com/rust-lang/rust/pull/78227
2277 [78201]: https://github.com/rust-lang/rust/pull/78201
2278 [78109]: https://github.com/rust-lang/rust/pull/78109
2279 [78077]: https://github.com/rust-lang/rust/pull/78077
2280 [77997]: https://github.com/rust-lang/rust/pull/77997
2281 [77703]: https://github.com/rust-lang/rust/pull/77703
2282 [77547]: https://github.com/rust-lang/rust/pull/77547
2283 [77015]: https://github.com/rust-lang/rust/pull/77015
2284 [76199]: https://github.com/rust-lang/rust/pull/76199
2285 [76119]: https://github.com/rust-lang/rust/pull/76119
2286 [75914]: https://github.com/rust-lang/rust/pull/75914
2287 [79004]: https://github.com/rust-lang/rust/pull/79004
2288 [78676]: https://github.com/rust-lang/rust/pull/78676
2289 [79904]: https://github.com/rust-lang/rust/issues/79904
2290 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2291 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2292 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2293 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2294 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2295 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2296 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2297 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2298 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2299 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2301 Version 1.48.0 (2020-11-19)
2302 ==========================
2307 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2308 is still rejected *semantically*, but can now be parsed by procedural macros.
2312 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2313 `rustc` whether to link its own C runtime and libraries or to rely on a external
2314 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2315 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2316 Note: If you're using cargo you must explicitly pass the `--target` flag.
2317 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2319 \* Refer to Rust's [platform support page][platform-support-doc] for more
2320 information on Rust's tiered platform support.
2324 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2325 and `&Stderr`.][76275]
2326 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2327 - [The `matches!` macro now supports having a trailing comma.][74880]
2328 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2329 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2333 - [`slice::as_ptr_range`]
2334 - [`slice::as_mut_ptr_range`]
2335 - [`VecDeque::make_contiguous`]
2336 - [`future::pending`]
2339 The following previously stable methods are now `const fn`'s:
2341 - [`Option::is_some`]
2342 - [`Option::is_none`]
2343 - [`Option::as_ref`]
2345 - [`Result::is_err`]
2346 - [`Result::as_ref`]
2347 - [`Ordering::reverse`]
2348 - [`Ordering::then`]
2355 - [You can now link to items in `rustdoc` using the intra-doc link
2356 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2357 a link to `std::future`'s documentation. See ["Linking to items by
2358 name"][intradoc-links] for more information.
2359 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2360 when searching through `rustdoc`'s UI.][75740]
2364 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2365 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2366 promoted to `'static` lifetime any more inside `const fn`s.
2367 - [Associated type bindings on trait objects are now verified to meet the bounds
2368 declared on the trait when checking that they implement the trait.][27675]
2369 - [When trait bounds on associated types or opaque types are ambiguous, the
2370 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2371 - [Fixed recursive nonterminals not being expanded in macros during
2372 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2373 correctly handling recursive nonterminal tokens.
2374 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2375 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2376 in places where they have no effect.][73461]
2377 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2378 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2379 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2380 disallow zero-initialization.][71274]
2381 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2382 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2383 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2384 see the [`catch_unwind`] documentation for further information.
2390 These changes provide no direct user facing benefits, but represent significant
2391 improvements to the internals and overall performance of rustc and
2394 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2395 You can continue building with `make` by setting `ninja=false` in
2397 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2398 - [Made `ensure_sufficient_stack()` non-generic][76680]
2400 [78143]: https://github.com/rust-lang/rust/issues/78143
2401 [76680]: https://github.com/rust-lang/rust/pull/76680/
2402 [76030]: https://github.com/rust-lang/rust/pull/76030/
2403 [70212]: https://github.com/rust-lang/rust/pull/70212/
2404 [27675]: https://github.com/rust-lang/rust/issues/27675/
2405 [54121]: https://github.com/rust-lang/rust/issues/54121/
2406 [71274]: https://github.com/rust-lang/rust/pull/71274/
2407 [77386]: https://github.com/rust-lang/rust/pull/77386/
2408 [77153]: https://github.com/rust-lang/rust/pull/77153/
2409 [77055]: https://github.com/rust-lang/rust/pull/77055/
2410 [76275]: https://github.com/rust-lang/rust/pull/76275/
2411 [76310]: https://github.com/rust-lang/rust/pull/76310/
2412 [76420]: https://github.com/rust-lang/rust/pull/76420/
2413 [76158]: https://github.com/rust-lang/rust/pull/76158/
2414 [75857]: https://github.com/rust-lang/rust/pull/75857/
2415 [75585]: https://github.com/rust-lang/rust/pull/75585/
2416 [75740]: https://github.com/rust-lang/rust/pull/75740/
2417 [75502]: https://github.com/rust-lang/rust/pull/75502/
2418 [74880]: https://github.com/rust-lang/rust/pull/74880/
2419 [74922]: https://github.com/rust-lang/rust/pull/74922/
2420 [74430]: https://github.com/rust-lang/rust/pull/74430/
2421 [74194]: https://github.com/rust-lang/rust/pull/74194/
2422 [73461]: https://github.com/rust-lang/rust/pull/73461/
2423 [73166]: https://github.com/rust-lang/rust/pull/73166/
2424 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2425 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2426 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2427 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2428 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2429 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2430 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2431 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2432 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2433 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2434 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2435 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2436 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2437 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2438 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2441 Version 1.47.0 (2020-10-08)
2442 ==========================
2446 - [Closures will now warn when not used.][74869]
2450 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2451 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2453 - [Upgraded to LLVM 11.][73526]
2454 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2455 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2456 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2458 \* Refer to Rust's [platform support page][platform-support-doc] for more
2459 information on Rust's tiered platform support.
2463 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2464 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2465 those of length less than 33.][74060]
2466 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2467 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2468 `PartialEq`, and `PartialOrd`.][73583]
2472 - [`Ident::new_raw`]
2473 - [`Range::is_empty`]
2474 - [`RangeInclusive::is_empty`]
2475 - [`Result::as_deref`]
2476 - [`Result::as_deref_mut`]
2478 - [`pointer::offset_from`]
2482 The following previously stable APIs have now been made const.
2484 - [The `new` method for all `NonZero` integers.][73858]
2485 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2486 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2487 methods for all integers.][73858]
2488 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2489 signed integers.][73858]
2490 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2491 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2492 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2493 `is_ascii_control` methods for `char` and `u8`.][73858]
2497 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2498 You can override this by setting the following in your `Cargo.toml`.
2500 [profile.release.build-override]
2503 - [`cargo-help` will now display man pages for commands rather just the
2504 `--help` text.][cargo/8456]
2505 - [`cargo-metadata` now emits a `test` field indicating if a target has
2506 tests enabled.][cargo/8478]
2507 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2508 - [`cargo-publish` will now use an alternative registry by default if it's the
2509 only registry specified in `package.publish`.][cargo/8571]
2513 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2514 type based search.][75366]
2515 - [Added the Ayu theme to rustdoc.][71237]
2519 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2520 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2521 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2522 help to preserve more span information.][73084] These changes may cause
2523 compiliation errors if your macro was unhygenic or didn't correctly handle
2525 - [Moved support for the CloudABI target to tier 3.][75568]
2526 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2527 - [Added the `rustc-docs` component.][75560] This allows you to install
2528 and read the documentation for the compiler internal APIs. (Currently only
2529 available for `x86_64-unknown-linux-gnu`.)
2534 - [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.
2536 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2537 [75048]: https://github.com/rust-lang/rust/pull/75048/
2538 [74163]: https://github.com/rust-lang/rust/pull/74163/
2539 [71237]: https://github.com/rust-lang/rust/pull/71237/
2540 [74869]: https://github.com/rust-lang/rust/pull/74869/
2541 [73858]: https://github.com/rust-lang/rust/pull/73858/
2542 [75716]: https://github.com/rust-lang/rust/pull/75716/
2543 [75560]: https://github.com/rust-lang/rust/pull/75560/
2544 [75568]: https://github.com/rust-lang/rust/pull/75568/
2545 [75366]: https://github.com/rust-lang/rust/pull/75366/
2546 [75204]: https://github.com/rust-lang/rust/pull/75204/
2547 [74650]: https://github.com/rust-lang/rust/pull/74650/
2548 [74419]: https://github.com/rust-lang/rust/pull/74419/
2549 [73964]: https://github.com/rust-lang/rust/pull/73964/
2550 [74021]: https://github.com/rust-lang/rust/pull/74021/
2551 [74060]: https://github.com/rust-lang/rust/pull/74060/
2552 [73893]: https://github.com/rust-lang/rust/pull/73893/
2553 [73526]: https://github.com/rust-lang/rust/pull/73526/
2554 [73583]: https://github.com/rust-lang/rust/pull/73583/
2555 [73084]: https://github.com/rust-lang/rust/pull/73084/
2556 [73197]: https://github.com/rust-lang/rust/pull/73197/
2557 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2558 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2559 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2560 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2561 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2562 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2563 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2564 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2565 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2566 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2567 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2568 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2569 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2570 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2573 Version 1.46.0 (2020-08-27)
2574 ==========================
2578 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2579 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2580 const functions.][73862]
2581 - [The `#[track_caller]` attribute can now be added to functions to use the
2582 function's caller's location information for panic messages.][72445]
2583 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2584 `x.0.0` over `(x.0).0`.
2585 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2586 You currently can't use `mem::transmute` in constant functions.
2590 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2591 - [Enabled static "Position Independent Executables" by default
2592 for `x86_64-unknown-linux-musl`.][70740]
2596 - [`mem::forget` is now a `const fn`.][73887]
2597 - [`String` now implements `From<char>`.][73466]
2598 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2599 integer types.][73032]
2600 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2601 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2602 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2603 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2604 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2605 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2610 - [`vec::Drain::as_slice`]
2614 Added a number of new environment variables that are now available when
2615 compiling your crate.
2617 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2618 the specific binary being compiled and the name of the crate.
2619 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2620 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2624 - [The target configuration option `abi_blacklist` has been renamed
2625 to `unsupported_abis`.][74150] The old name will still continue to work.
2626 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2627 This was previously accepted but will become a hard error in a future release.
2628 - [Rustc will fail to compile if you have a struct with
2629 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2631 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2632 ensure that spans have the correct information, and may cause breakage if you
2633 were relying on receiving spans with dummy information.
2634 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2635 a legacy installer that was replaced by a MSI installer a few years ago but
2636 was still being built.
2637 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2638 - [Rustc will no longer accept overlapping trait implementations that only
2639 differ in how the lifetime was bound.][72493]
2640 - [Rustc now correctly relates the lifetime of an existential associated
2641 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2642 you to pass a shorter lifetime than expected.
2643 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2644 The library will need to be installed for `rustc` to work, even though we
2645 expect it to be already available on most systems.
2646 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2648 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2649 exact output returned by rustc's pretty printing is an unstable
2650 implementation detail: we recommend any macro relying on it to switch to a
2651 more robust parsing system.
2653 [75453]: https://github.com/rust-lang/rust/issues/75453/
2654 [74820]: https://github.com/rust-lang/rust/issues/74820/
2655 [74420]: https://github.com/rust-lang/rust/issues/74420/
2656 [74109]: https://github.com/rust-lang/rust/pull/74109/
2657 [74150]: https://github.com/rust-lang/rust/pull/74150/
2658 [73862]: https://github.com/rust-lang/rust/pull/73862/
2659 [73887]: https://github.com/rust-lang/rust/pull/73887/
2660 [73466]: https://github.com/rust-lang/rust/pull/73466/
2661 [73516]: https://github.com/rust-lang/rust/pull/73516/
2662 [73293]: https://github.com/rust-lang/rust/pull/73293/
2663 [73007]: https://github.com/rust-lang/rust/pull/73007/
2664 [73032]: https://github.com/rust-lang/rust/pull/73032/
2665 [72920]: https://github.com/rust-lang/rust/pull/72920/
2666 [72569]: https://github.com/rust-lang/rust/pull/72569/
2667 [72583]: https://github.com/rust-lang/rust/pull/72583/
2668 [72584]: https://github.com/rust-lang/rust/pull/72584/
2669 [72717]: https://github.com/rust-lang/rust/pull/72717/
2670 [72437]: https://github.com/rust-lang/rust/pull/72437/
2671 [72445]: https://github.com/rust-lang/rust/pull/72445/
2672 [72486]: https://github.com/rust-lang/rust/pull/72486/
2673 [72493]: https://github.com/rust-lang/rust/pull/72493/
2674 [72331]: https://github.com/rust-lang/rust/pull/72331/
2675 [71896]: https://github.com/rust-lang/rust/pull/71896/
2676 [71660]: https://github.com/rust-lang/rust/pull/71660/
2677 [71322]: https://github.com/rust-lang/rust/pull/71322/
2678 [70740]: https://github.com/rust-lang/rust/pull/70740/
2679 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2680 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2681 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2682 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2683 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2686 Version 1.45.2 (2020-08-03)
2687 ==========================
2689 * [Fix bindings in tuple struct patterns][74954]
2690 * [Fix track_caller integration with trait objects][74784]
2692 [74954]: https://github.com/rust-lang/rust/issues/74954
2693 [74784]: https://github.com/rust-lang/rust/issues/74784
2696 Version 1.45.1 (2020-07-30)
2697 ==========================
2699 * [Fix const propagation with references.][73613]
2700 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2701 * [Avoid spurious implicit region bound.][74509]
2702 * [Install clippy on x.py install][74457]
2704 [73613]: https://github.com/rust-lang/rust/pull/73613
2705 [73078]: https://github.com/rust-lang/rust/issues/73078
2706 [74509]: https://github.com/rust-lang/rust/pull/74509
2707 [74457]: https://github.com/rust-lang/rust/pull/74457
2710 Version 1.45.0 (2020-07-16)
2711 ==========================
2715 - [Out of range float to int conversions using `as` has been defined as a saturating
2716 conversion.][71269] This was previously undefined behaviour, but you can use the
2717 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2718 may be desirable in rare performance sensitive situations.
2719 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2720 using `u64`.][70705]
2721 - [Function like procedural macros can now be used in expression, pattern, and statement
2722 positions.][68717] This means you can now use a function-like procedural macro
2723 anywhere you can use a declarative (`macro_rules!`) macro.
2727 - [You can now override individual target features through the `target-feature`
2728 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2729 equivalent to `-C target-feature=+avx2,+fma`.
2730 - [Added the `force-unwind-tables` flag.][69984] This option allows
2731 rustc to always generate unwind tables regardless of panic strategy.
2732 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2733 to include LLVM bitcode into generated `rlib`s (this is on by default).
2734 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2735 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2736 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2737 - [Upgraded to LLVM 10.][67759]
2739 \* Refer to Rust's [platform support page][platform-support-doc] for more
2740 information on Rust's tiered platform support.
2745 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2747 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2748 - [You can now use `char` with
2749 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2750 a range of codepoints.][72413] E.g.
2751 you can now write the following;
2753 for ch in 'a'..='z' {
2757 // Prints "abcdefghijklmnopqrstuvwxyz"
2759 - [`OsString` now implements `FromStr`.][71662]
2760 - [The `saturating_neg` method has been added to all signed integer primitive
2761 types, and the `saturating_abs` method has been added for all integer
2762 primitive types.][71886]
2763 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2764 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2766 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2767 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2768 integer types.][69813]
2769 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2770 integer types.][72324]
2771 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2776 - [`BTreeMap::remove_entry`]
2778 - [`rc::Weak::as_ptr`]
2779 - [`rc::Weak::from_raw`]
2780 - [`rc::Weak::into_raw`]
2781 - [`str::strip_prefix`]
2782 - [`str::strip_suffix`]
2783 - [`sync::Weak::as_ptr`]
2784 - [`sync::Weak::from_raw`]
2785 - [`sync::Weak::into_raw`]
2786 - [`char::UNICODE_VERSION`]
2787 - [`Span::resolved_at`]
2788 - [`Span::located_at`]
2789 - [`Span::mixed_site`]
2790 - [`unix::process::CommandExt::arg0`]
2795 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2800 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2801 `~~outdated information~~` becomes "~~outdated information~~".
2802 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2806 - [Trying to self initialize a static value (that is creating a value using
2807 itself) is unsound and now causes a compile error.][71140]
2808 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2809 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2810 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2811 previously undocumented and not intended for public use. Rustdoc still provides
2812 a non-zero exit code on errors.
2813 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2814 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2815 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2816 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2817 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2821 - [Make clippy a git subtree instead of a git submodule][70655]
2822 - [Unify the undo log of all snapshot types][69464]
2824 [71848]: https://github.com/rust-lang/rust/issues/71848/
2825 [73420]: https://github.com/rust-lang/rust/issues/73420/
2826 [72324]: https://github.com/rust-lang/rust/pull/72324/
2827 [71843]: https://github.com/rust-lang/rust/pull/71843/
2828 [71886]: https://github.com/rust-lang/rust/pull/71886/
2829 [72234]: https://github.com/rust-lang/rust/pull/72234/
2830 [72239]: https://github.com/rust-lang/rust/pull/72239/
2831 [72397]: https://github.com/rust-lang/rust/pull/72397/
2832 [72413]: https://github.com/rust-lang/rust/pull/72413/
2833 [72014]: https://github.com/rust-lang/rust/pull/72014/
2834 [72062]: https://github.com/rust-lang/rust/pull/72062/
2835 [72094]: https://github.com/rust-lang/rust/pull/72094/
2836 [72133]: https://github.com/rust-lang/rust/pull/72133/
2837 [67759]: https://github.com/rust-lang/rust/pull/67759/
2838 [71900]: https://github.com/rust-lang/rust/pull/71900/
2839 [71928]: https://github.com/rust-lang/rust/pull/71928/
2840 [71662]: https://github.com/rust-lang/rust/pull/71662/
2841 [71716]: https://github.com/rust-lang/rust/pull/71716/
2842 [71447]: https://github.com/rust-lang/rust/pull/71447/
2843 [71269]: https://github.com/rust-lang/rust/pull/71269/
2844 [71095]: https://github.com/rust-lang/rust/pull/71095/
2845 [71140]: https://github.com/rust-lang/rust/pull/71140/
2846 [70655]: https://github.com/rust-lang/rust/pull/70655/
2847 [70705]: https://github.com/rust-lang/rust/pull/70705/
2848 [69984]: https://github.com/rust-lang/rust/pull/69984/
2849 [69813]: https://github.com/rust-lang/rust/pull/69813/
2850 [69464]: https://github.com/rust-lang/rust/pull/69464/
2851 [68717]: https://github.com/rust-lang/rust/pull/68717/
2852 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2853 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2854 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2855 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2856 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2857 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2858 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2859 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2860 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2861 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2862 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2863 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2864 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2865 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2866 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2867 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2868 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2871 Version 1.44.1 (2020-06-18)
2872 ===========================
2874 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2875 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2876 * [Fix crashes when finding backtrace on macOS.][71397]
2877 * [Clippy applies lint levels into different files.][clippy/5356]
2879 [71397]: https://github.com/rust-lang/rust/issues/71397
2880 [73078]: https://github.com/rust-lang/rust/issues/73078
2881 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2882 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2885 Version 1.44.0 (2020-06-04)
2886 ==========================
2890 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2891 - [Added the `unused_braces` lint.][70081]
2893 **Syntax-only changes**
2895 - [Expansion-driven outline module parsing][69838]
2900 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2905 These are still rejected semantically, so you will likely receive an error but
2906 these changes can be seen and parsed by macros and conditional compilation.
2910 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2911 Additionally when in incremental mode rustc defaults to 256 codegen units.
2912 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2913 a panic is thrown.][67502]
2914 - [Added tier 3\* support for the `aarch64-unknown-none` and
2915 `aarch64-unknown-none-softfloat` targets.][68334]
2916 - [Added tier 3 support for `arm64-apple-tvos` and
2917 `x86_64-apple-tvos` targets.][68191]
2922 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2923 `vec![]` to be able to be used in `const` contexts.
2924 - [`convert::Infallible` now implements `Hash`.][70281]
2925 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2926 a `&mut OsStr`.][70048]
2927 - [Unicode 13 is now supported.][69929]
2928 - [`String` now implements `From<&mut str>`.][69661]
2929 - [`IoSlice` now implements `Copy`.][69403]
2930 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2931 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2932 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2933 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2934 integer types.][69373]
2938 - [`PathBuf::with_capacity`]
2939 - [`PathBuf::capacity`]
2940 - [`PathBuf::clear`]
2941 - [`PathBuf::reserve`]
2942 - [`PathBuf::reserve_exact`]
2943 - [`PathBuf::shrink_to_fit`]
2944 - [`f32::to_int_unchecked`]
2945 - [`f64::to_int_unchecked`]
2946 - [`Layout::align_to`]
2947 - [`Layout::pad_to_align`]
2949 - [`Layout::extend`]
2953 - [Added the `cargo tree` command which will print a tree graph of
2954 your dependencies.][cargo/8062] E.g.
2956 mdbook v0.3.2 (/Users/src/rust/mdbook)
2958 │ ├── html5ever v0.24.0
2960 │ │ │ └── cfg-if v0.1.9
2962 │ │ └── markup5ever v0.9.0
2963 │ │ ├── log v0.4.8 (*)
2965 │ │ │ └── phf_shared v0.7.24
2966 │ │ │ ├── siphasher v0.2.3
2967 │ │ │ └── unicase v1.4.2
2968 │ │ │ [build-dependencies]
2969 │ │ │ └── version_check v0.1.5
2972 You can also display dependencies on multiple versions of the same crate with
2973 `cargo tree -d` (short for `cargo tree --duplicates`).
2977 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2978 the version in the sidebar.][69494]
2982 - [Rustc now correctly generates static libraries on Windows GNU targets with
2983 the `.a` extension, rather than the previous `.lib`.][70937]
2984 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2985 - [The `file_name` property in JSON output of macro errors now points the actual
2986 source file rather than the previous format of `<NAME macros>`.][70969]
2987 **Note:** this may not point to a file that actually exists on the user's system.
2988 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2989 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2990 not allow zero initialization such as `NonZeroU8`.][66059] This was
2991 previously a warning.
2992 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2993 operator has been defined as a saturating operation.][71269] This was previously
2994 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2995 continue using the current behaviour, which may be desirable in rare performance
2996 sensitive situations.
3000 These changes provide no direct user facing benefits, but represent significant
3001 improvements to the internals and overall performance of rustc and
3004 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3005 - [Replace big JS dict with JSON parsing.][71250]
3007 [69373]: https://github.com/rust-lang/rust/pull/69373/
3008 [66059]: https://github.com/rust-lang/rust/pull/66059/
3009 [68191]: https://github.com/rust-lang/rust/pull/68191/
3010 [68899]: https://github.com/rust-lang/rust/pull/68899/
3011 [71147]: https://github.com/rust-lang/rust/pull/71147/
3012 [71250]: https://github.com/rust-lang/rust/pull/71250/
3013 [70937]: https://github.com/rust-lang/rust/pull/70937/
3014 [70969]: https://github.com/rust-lang/rust/pull/70969/
3015 [70632]: https://github.com/rust-lang/rust/pull/70632/
3016 [70281]: https://github.com/rust-lang/rust/pull/70281/
3017 [70345]: https://github.com/rust-lang/rust/pull/70345/
3018 [70048]: https://github.com/rust-lang/rust/pull/70048/
3019 [70081]: https://github.com/rust-lang/rust/pull/70081/
3020 [70156]: https://github.com/rust-lang/rust/pull/70156/
3021 [71269]: https://github.com/rust-lang/rust/pull/71269/
3022 [69838]: https://github.com/rust-lang/rust/pull/69838/
3023 [69929]: https://github.com/rust-lang/rust/pull/69929/
3024 [69661]: https://github.com/rust-lang/rust/pull/69661/
3025 [69778]: https://github.com/rust-lang/rust/pull/69778/
3026 [69494]: https://github.com/rust-lang/rust/pull/69494/
3027 [69403]: https://github.com/rust-lang/rust/pull/69403/
3028 [69033]: https://github.com/rust-lang/rust/pull/69033/
3029 [68692]: https://github.com/rust-lang/rust/pull/68692/
3030 [68334]: https://github.com/rust-lang/rust/pull/68334/
3031 [67502]: https://github.com/rust-lang/rust/pull/67502/
3032 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3033 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3034 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3035 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3036 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3037 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3038 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3039 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3040 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3041 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3042 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3043 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3044 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3047 Version 1.43.1 (2020-05-07)
3048 ===========================
3050 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3051 * [Fixed the stabilization of AVX-512 features.][71473]
3052 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3054 [71430]: https://github.com/rust-lang/rust/pull/71430
3055 [71473]: https://github.com/rust-lang/rust/issues/71473
3056 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3059 Version 1.43.0 (2020-04-23)
3060 ==========================
3064 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3065 the type inferred correctly.][68129]
3066 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3068 **Syntax only changes**
3069 - [Allow `type Foo: Ord` syntactically.][69361]
3070 - [Fuse associated and extern items up to defaultness.][69194]
3071 - [Syntactically allow `self` in all `fn` contexts.][68764]
3072 - [Merge `fn` syntax + cleanup item parsing.][68728]
3073 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3074 For example, you may now write:
3076 macro_rules! mac_trait {
3086 These are still rejected *semantically*, so you will likely receive an error but
3087 these changes can be seen and parsed by macros and
3088 conditional compilation.
3093 - [You can now pass multiple lint flags to rustc to override the previous
3094 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3095 everything in the `unused` lint group except `unused-variables` which
3096 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3097 everything in the `unused` lint group **including** `unused-variables` since
3098 the allow flag is specified before the deny flag (and therefore overridden).
3099 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3100 if they are available on `windows-gnu`.][67429]
3101 - [rustc now buffers errors/warnings printed in JSON.][69227]
3105 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3106 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3107 respectively.][69538] **Note** These conversions are only available when `N`
3109 - [You can now use associated constants on floats and integers directly, rather
3110 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3111 `f32::NAN` with no imports.
3112 - [`u8::is_ascii` is now `const`.][68984]
3113 - [`String` now implements `AsMut<str>`.][68742]
3114 - [Added the `primitive` module to `std` and `core`.][67637] This module
3115 reexports Rust's primitive types. This is mainly useful in macros
3116 where you want avoid these types being shadowed.
3117 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3118 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3122 - [`Once::is_completed`]
3127 - [`iter::once_with`]
3131 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3132 your environment.][cargo/7823]
3133 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3134 executable path when running integration tests or benchmarks.][cargo/7697]
3135 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3136 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3140 - [Certain checks in the `const_err` lint were deemed unrelated to const
3141 evaluation][69185], and have been moved to the `unconditional_panic` and
3142 `arithmetic_overflow` lints.
3147 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3148 has been a warning since 1.36.0.
3149 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3150 led to some instances being accepted, and now correctly emits a hard error.
3152 [69340]: https://github.com/rust-lang/rust/pull/69340
3156 These changes provide no direct user facing benefits, but represent significant
3157 improvements to the internals and overall performance of `rustc` and
3160 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3161 - [Improved how rustc generates drop code.][67332]
3162 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3163 - [traits: preallocate 2 Vecs of known initial size][69022]
3164 - [Avoid exponential behaviour when relating types][68772]
3165 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3166 - [Improve performance of coherence checks][68966]
3167 - [Deduplicate types in the generator witness][68672]
3168 - [Invert control in struct_lint_level.][68725]
3170 [67332]: https://github.com/rust-lang/rust/pull/67332/
3171 [67429]: https://github.com/rust-lang/rust/pull/67429/
3172 [67637]: https://github.com/rust-lang/rust/pull/67637/
3173 [67642]: https://github.com/rust-lang/rust/pull/67642/
3174 [67878]: https://github.com/rust-lang/rust/pull/67878/
3175 [67885]: https://github.com/rust-lang/rust/pull/67885/
3176 [68129]: https://github.com/rust-lang/rust/pull/68129/
3177 [68672]: https://github.com/rust-lang/rust/pull/68672/
3178 [68725]: https://github.com/rust-lang/rust/pull/68725/
3179 [68728]: https://github.com/rust-lang/rust/pull/68728/
3180 [68738]: https://github.com/rust-lang/rust/pull/68738/
3181 [68742]: https://github.com/rust-lang/rust/pull/68742/
3182 [68764]: https://github.com/rust-lang/rust/pull/68764/
3183 [68772]: https://github.com/rust-lang/rust/pull/68772/
3184 [68943]: https://github.com/rust-lang/rust/pull/68943/
3185 [68952]: https://github.com/rust-lang/rust/pull/68952/
3186 [68966]: https://github.com/rust-lang/rust/pull/68966/
3187 [68984]: https://github.com/rust-lang/rust/pull/68984/
3188 [69022]: https://github.com/rust-lang/rust/pull/69022/
3189 [69185]: https://github.com/rust-lang/rust/pull/69185/
3190 [69194]: https://github.com/rust-lang/rust/pull/69194/
3191 [69201]: https://github.com/rust-lang/rust/pull/69201/
3192 [69227]: https://github.com/rust-lang/rust/pull/69227/
3193 [69548]: https://github.com/rust-lang/rust/pull/69548/
3194 [69256]: https://github.com/rust-lang/rust/pull/69256/
3195 [69361]: https://github.com/rust-lang/rust/pull/69361/
3196 [69366]: https://github.com/rust-lang/rust/pull/69366/
3197 [69538]: https://github.com/rust-lang/rust/pull/69538/
3198 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3199 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3200 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3201 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3202 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3203 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3204 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3205 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3208 Version 1.42.0 (2020-03-12)
3209 ==========================
3213 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3215 fn foo(words: &[&str]) {
3217 ["Hello", "World", "!", ..] => println!("Hello World!"),
3218 ["Foo", "Bar", ..] => println!("Baz"),
3219 rest => println!("{:?}", rest),
3223 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3224 that you can create an enum that has the exact layout and ABI of the type
3226 - [You can now use outer attribute procedural macros on inline modules.][64273]
3227 - [There are some *syntax-only* changes:][67131]
3228 - `default` is syntactically allowed before items in `trait` definitions.
3229 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3230 leave out their bodies in favor of `;`.
3231 - Bounds on associated types in `impl`s are now syntactically allowed
3232 (e.g. `type Foo: Ord;`).
3233 - `...` (the C-variadic type) may occur syntactically directly as the type of
3234 any function parameter.
3236 These are still rejected *semantically*, so you will likely receive an error
3237 but these changes can be seen and parsed by procedural macros and
3238 conditional compilation.
3242 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3243 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3244 - [`Option::{expect,unwrap}` and
3245 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3246 pointing to the location where they were called, rather than
3247 `core`'s internals. ][67887]
3249 \* Refer to Rust's [platform support page][platform-support-doc] for more
3250 information on Rust's tiered platform support.
3254 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3255 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3256 to implement `Sized`.][67935]
3257 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3258 - [`Layout::new` is now `const`.][66254]
3259 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3264 - [`CondVar::wait_while`]
3265 - [`CondVar::wait_timeout_while`]
3267 - [`DebugMap::value`]
3268 - [`ManuallyDrop::take`]
3270 - [`ptr::slice_from_raw_parts_mut`]
3271 - [`ptr::slice_from_raw_parts`]
3275 - [You no longer need to include `extern crate proc_macro;` to be able to
3276 `use proc_macro;` in the `2018` edition.][cargo/7700]
3280 - [`Error::description` has been deprecated, and its use will now produce a
3281 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3283 [68253]: https://github.com/rust-lang/rust/pull/68253/
3284 [68348]: https://github.com/rust-lang/rust/pull/68348/
3285 [67935]: https://github.com/rust-lang/rust/pull/67935/
3286 [68339]: https://github.com/rust-lang/rust/pull/68339/
3287 [68122]: https://github.com/rust-lang/rust/pull/68122/
3288 [64273]: https://github.com/rust-lang/rust/pull/64273/
3289 [67712]: https://github.com/rust-lang/rust/pull/67712/
3290 [67887]: https://github.com/rust-lang/rust/pull/67887/
3291 [67131]: https://github.com/rust-lang/rust/pull/67131/
3292 [67233]: https://github.com/rust-lang/rust/pull/67233/
3293 [66899]: https://github.com/rust-lang/rust/pull/66899/
3294 [66919]: https://github.com/rust-lang/rust/pull/66919/
3295 [66254]: https://github.com/rust-lang/rust/pull/66254/
3296 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3297 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3298 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3299 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3300 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3301 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3302 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3303 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3304 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3307 Version 1.41.1 (2020-02-27)
3308 ===========================
3310 * [Always check types of static items][69145]
3311 * [Always check lifetime bounds of `Copy` impls][69145]
3312 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3314 [69225]: https://github.com/rust-lang/rust/issues/69225
3315 [69145]: https://github.com/rust-lang/rust/pull/69145
3318 Version 1.41.0 (2020-01-30)
3319 ===========================
3324 - [You can now pass type parameters to foreign items when implementing
3325 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3326 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3327 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3328 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3329 - [You can now use any valid identifier in a `format_args` macro.][66847]
3330 Previously identifiers starting with an underscore were not allowed.
3331 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3332 enum variants.][66183] These are still rejected semantically, but
3333 can be seen and parsed by procedural macros and conditional compilation.
3334 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3335 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3336 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3338 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3343 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3344 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3345 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3346 - [You can now pass an arguments file passing the `@path` syntax
3347 to rustc.][66172] Note that the format differs somewhat from what is
3348 found in other tooling; please see [the documentation][argfile-docs] for
3350 - [You can now provide `--extern` flag without a path, indicating that it is
3351 available from the search path or specified with an `-L` flag.][64882]
3353 \* Refer to Rust's [platform support page][platform-support-doc] for more
3354 information on Rust's tiered platform support.
3356 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3361 - [The `core::panic` module is now stable.][66771] It was already stable
3363 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3364 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3365 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3370 - [`Result::map_or`]
3371 - [`Result::map_or_else`]
3372 - [`std::rc::Weak::weak_count`]
3373 - [`std::rc::Weak::strong_count`]
3374 - [`std::sync::Weak::weak_count`]
3375 - [`std::sync::Weak::strong_count`]
3380 - [Cargo will now document all the private items for binary crates
3381 by default.][cargo/7593]
3382 - [`cargo-install` will now reinstall the package if it detects that it is out
3383 of date.][cargo/7560]
3384 - [Cargo.lock now uses a more git friendly format that should help to reduce
3385 merge conflicts.][cargo/7579]
3386 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3387 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3388 optimisation level to `2` for debug builds. You can also use
3389 `[profile.<profile>.build-override]` to override build scripts and
3395 - [You can now specify `edition` in documentation code blocks to compile the block
3396 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3397 should be compiled the 2018 edition of Rust.
3398 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3399 current theme with `--check-theme`.][54733]
3400 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3405 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3406 Apple targets.][apple-32bit-drop] This means that the source code is still
3407 available to build, but the targets are no longer being tested and release
3408 binaries for those platforms will no longer be distributed by the Rust project.
3409 Please refer to the linked blog post for more information.
3411 [54733]: https://github.com/rust-lang/rust/pull/54733/
3412 [61351]: https://github.com/rust-lang/rust/pull/61351/
3413 [62514]: https://github.com/rust-lang/rust/pull/62514/
3414 [67255]: https://github.com/rust-lang/rust/pull/67255/
3415 [66661]: https://github.com/rust-lang/rust/pull/66661/
3416 [66771]: https://github.com/rust-lang/rust/pull/66771/
3417 [66847]: https://github.com/rust-lang/rust/pull/66847/
3418 [66238]: https://github.com/rust-lang/rust/pull/66238/
3419 [66277]: https://github.com/rust-lang/rust/pull/66277/
3420 [66325]: https://github.com/rust-lang/rust/pull/66325/
3421 [66172]: https://github.com/rust-lang/rust/pull/66172/
3422 [66183]: https://github.com/rust-lang/rust/pull/66183/
3423 [65879]: https://github.com/rust-lang/rust/pull/65879/
3424 [65013]: https://github.com/rust-lang/rust/pull/65013/
3425 [64882]: https://github.com/rust-lang/rust/pull/64882/
3426 [64325]: https://github.com/rust-lang/rust/pull/64325/
3427 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3428 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3429 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3430 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3431 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3432 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3433 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3434 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3435 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3436 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3437 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3439 Version 1.40.0 (2019-12-19)
3440 ===========================
3444 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3445 `const` contexts.][65188] e.g.
3448 pub struct Point(i32, i32);
3450 const ORIGIN: Point = {
3451 let constructor = Point;
3457 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3458 indicate that there may be variants or fields added in the future.][64639]
3459 For example this requires adding a wild-card branch (`_ => {}`) to any match
3460 statements on a non-exhaustive `enum`. [(RFC 2008)]
3461 - [You can now use function-like procedural macros in `extern` blocks and in
3462 type positions.][63931] e.g. `type Generated = macro!();`
3463 - [Function-like and attribute procedural macros can now emit
3464 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3465 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3466 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3467 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3471 - [Added tier 3 support\* for the
3472 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3473 - [Added tier 3 support for the
3474 `aarch64-unknown-none-softfloat` target.][64589]
3475 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3476 `mips64el-unknown-linux-muslabi64` targets.][65843]
3478 \* Refer to Rust's [platform support page][platform-support-doc] for more
3479 information on Rust's tiered platform support.
3483 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3487 - [`BTreeMap::get_key_value`]
3488 - [`HashMap::get_key_value`]
3489 - [`Option::as_deref_mut`]
3490 - [`Option::as_deref`]
3491 - [`Option::flatten`]
3492 - [`UdpSocket::peer_addr`]
3493 - [`f32::to_be_bytes`]
3494 - [`f32::to_le_bytes`]
3495 - [`f32::to_ne_bytes`]
3496 - [`f64::to_be_bytes`]
3497 - [`f64::to_le_bytes`]
3498 - [`f64::to_ne_bytes`]
3499 - [`f32::from_be_bytes`]
3500 - [`f32::from_le_bytes`]
3501 - [`f32::from_ne_bytes`]
3502 - [`f64::from_be_bytes`]
3503 - [`f64::from_le_bytes`]
3504 - [`f64::from_ne_bytes`]
3511 - [Cargo will now always display warnings, rather than only on
3512 fresh builds.][cargo/7450]
3513 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3514 now produce an error.][cargo/7507] Previously these flags were ignored.
3515 - [You can now publish `dev-dependencies` without including
3516 a `version`.][cargo/7333]
3520 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3521 when running documentation tests with `rustdoc`.][63803]
3525 - [As previously announced, any previous NLL warnings in the 2015 edition are
3526 now hard errors.][64221]
3527 - [The `include!` macro will now warn if it failed to include the
3528 entire file.][64284] The `include!` macro unintentionally only includes the
3529 first _expression_ in a file, and this can be unintuitive. This will become
3530 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3531 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3532 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3533 or `extern` blocks now correctly emits a hard error.
3535 [65294]: https://github.com/rust-lang/rust/pull/65294/
3536 [66103]: https://github.com/rust-lang/rust/pull/66103/
3537 [65843]: https://github.com/rust-lang/rust/pull/65843/
3538 [65188]: https://github.com/rust-lang/rust/pull/65188/
3539 [65092]: https://github.com/rust-lang/rust/pull/65092/
3540 [64589]: https://github.com/rust-lang/rust/pull/64589/
3541 [64639]: https://github.com/rust-lang/rust/pull/64639/
3542 [64221]: https://github.com/rust-lang/rust/pull/64221/
3543 [64284]: https://github.com/rust-lang/rust/pull/64284/
3544 [63931]: https://github.com/rust-lang/rust/pull/63931/
3545 [64035]: https://github.com/rust-lang/rust/pull/64035/
3546 [63674]: https://github.com/rust-lang/rust/pull/63674/
3547 [63803]: https://github.com/rust-lang/rust/pull/63803/
3548 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3549 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3550 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3551 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3552 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3553 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3554 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3555 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3556 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3557 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3558 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3559 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3560 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3561 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3562 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3563 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3564 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3565 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3566 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3567 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3568 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3569 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3570 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3571 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3572 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3575 Version 1.39.0 (2019-11-07)
3576 ===========================
3580 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3581 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3582 - [You can now use certain attributes on function, closure, and function pointer
3583 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3584 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3585 attributes applied to items. e.g.
3588 #[cfg(windows)] slice: &[u16],
3589 #[cfg(not(windows))] slice: &[u8],
3594 - [You can now take shared references to bind-by-move patterns in the `if` guards
3595 of `match` arms.][63118] e.g.
3598 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3602 // ---- `nums` is bound by move.
3603 if nums.iter().sum::<u8>() == 10
3604 // ^------ `.iter()` implicitly takes a reference to `nums`.
3607 // ----------- Legal as `nums` was bound by move and so we have ownership.
3609 _ => unreachable!(),
3618 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3619 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3620 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3621 **Note** Cargo currently doesn't use this feature. Refer to
3622 [cargo#7315][cargo/7315] to track this feature's progress.
3623 - [You can now pass `--show-output` argument to test binaries to print the
3624 output of successful tests.][62600]
3627 \* Refer to Rust's [platform support page][platform-support-doc] for more
3628 information on Rust's tiered platform support.
3632 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3633 - [`LinkedList::new` is now a `const` function.][63684]
3634 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3635 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3636 now `const`.][63786]
3640 - [`Pin::into_inner`]
3641 - [`Instant::checked_duration_since`]
3642 - [`Instant::saturating_duration_since`]
3646 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3647 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3648 `--all` is now deprecated.
3652 - [You can now pass `-Clinker` to rustdoc to control the linker used
3653 for compiling doctests.][63834]
3657 - [Code that was previously accepted by the old borrow checker, but rejected by
3658 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3659 previously a warning, and will also become a hard error in the Rust 2015
3660 edition in the 1.40.0 release.
3661 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3662 run tests.][63827] This should improve performance when running a large
3664 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3665 recommended to use the `?` operator instead.
3666 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3669 [62600]: https://github.com/rust-lang/rust/pull/62600/
3670 [62672]: https://github.com/rust-lang/rust/pull/62672/
3671 [63118]: https://github.com/rust-lang/rust/pull/63118/
3672 [63209]: https://github.com/rust-lang/rust/pull/63209/
3673 [63402]: https://github.com/rust-lang/rust/pull/63402/
3674 [63565]: https://github.com/rust-lang/rust/pull/63565/
3675 [63595]: https://github.com/rust-lang/rust/pull/63595/
3676 [63684]: https://github.com/rust-lang/rust/pull/63684/
3677 [63698]: https://github.com/rust-lang/rust/pull/63698/
3678 [63770]: https://github.com/rust-lang/rust/pull/63770/
3679 [63786]: https://github.com/rust-lang/rust/pull/63786/
3680 [63827]: https://github.com/rust-lang/rust/pull/63827/
3681 [63834]: https://github.com/rust-lang/rust/pull/63834/
3682 [64010]: https://github.com/rust-lang/rust/pull/64010/
3683 [64028]: https://github.com/rust-lang/rust/pull/64028/
3684 [64334]: https://github.com/rust-lang/rust/pull/64334/
3685 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3686 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3687 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3688 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3689 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3690 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3692 Version 1.38.0 (2019-09-26)
3693 ==========================
3697 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3698 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3702 - [Added pipelined compilation support to `rustc`.][62766] This will
3703 improve compilation times in some cases. For further information please refer
3704 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3705 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3706 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3707 `x86_64-uwp-windows-msvc` targets.][60260]
3708 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3709 `armv7-unknown-linux-musleabi` targets.][63107]
3710 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3711 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3712 - [Upgraded to LLVM 9.][62592]
3714 \* Refer to Rust's [platform support page][platform-support-doc] for more
3715 information on Rust's tiered platform support.
3719 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3720 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3721 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3722 is available at `std::clone::Clone`). This also makes all built-in macros
3723 available in `std`/`core` root. e.g. `std::include_bytes!`.
3724 - [`str::Chars` now implements `Debug`.][63000]
3725 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3726 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3727 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3728 - [Added euclidean remainder and division operations (`div_euclid`,
3729 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3730 `overflowing`, and `wrapping` versions are available for all
3732 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3733 `PartialEq`.][61491]
3734 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3738 - [`<*const T>::cast`]
3739 - [`<*mut T>::cast`]
3740 - [`Duration::as_secs_f32`]
3741 - [`Duration::as_secs_f64`]
3742 - [`Duration::div_f32`]
3743 - [`Duration::div_f64`]
3744 - [`Duration::from_secs_f32`]
3745 - [`Duration::from_secs_f64`]
3746 - [`Duration::mul_f32`]
3747 - [`Duration::mul_f64`]
3748 - [`any::type_name`]
3752 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3753 - [You can now pass the `--features` option multiple times to enable
3754 multiple features.][cargo/7084]
3759 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3763 - [`rustc` will now warn about some incorrect uses of
3764 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3768 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3770 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3771 issues][62896] with certain crates such as libc.
3773 [60260]: https://github.com/rust-lang/rust/pull/60260/
3774 [61457]: https://github.com/rust-lang/rust/pull/61457/
3775 [61491]: https://github.com/rust-lang/rust/pull/61491/
3776 [61884]: https://github.com/rust-lang/rust/pull/61884/
3777 [61953]: https://github.com/rust-lang/rust/pull/61953/
3778 [62042]: https://github.com/rust-lang/rust/pull/62042/
3779 [62528]: https://github.com/rust-lang/rust/pull/62528/
3780 [62583]: https://github.com/rust-lang/rust/pull/62583/
3781 [62735]: https://github.com/rust-lang/rust/pull/62735/
3782 [62766]: https://github.com/rust-lang/rust/pull/62766/
3783 [62784]: https://github.com/rust-lang/rust/pull/62784/
3784 [62592]: https://github.com/rust-lang/rust/pull/62592/
3785 [62785]: https://github.com/rust-lang/rust/issues/62785/
3786 [62814]: https://github.com/rust-lang/rust/pull/62814/
3787 [62896]: https://github.com/rust-lang/rust/issues/62896/
3788 [63000]: https://github.com/rust-lang/rust/pull/63000/
3789 [63056]: https://github.com/rust-lang/rust/pull/63056/
3790 [63107]: https://github.com/rust-lang/rust/pull/63107/
3791 [63346]: https://github.com/rust-lang/rust/pull/63346/
3792 [63421]: https://github.com/rust-lang/rust/pull/63421/
3793 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3794 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3795 [63048]: https://github.com/rust-lang/rust/pull/63048
3796 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3797 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3798 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3799 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3800 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3801 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3802 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3803 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3804 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3805 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3806 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3807 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3808 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3810 Version 1.37.0 (2019-08-15)
3811 ==========================
3815 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3816 [`Box`][62228], or an [array][62235] and unused.
3817 - [You can now use the `cfg` and `cfg_attr` attributes on
3818 generic parameters.][61547]
3819 - [You can now use enum variants through type alias.][61682] e.g. You can
3820 write the following:
3822 type MyOption = Option<u8>;
3824 fn increment_or_zero(x: MyOption) -> u8 {
3826 MyOption::Some(y) => y + 1,
3827 MyOption::None => 0,
3831 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3832 `const _: u32 = 5;`.
3833 - [You can now use `#[repr(align(X)]` on enums.][61229]
3834 - [The `?` Kleene macro operator is now available in the
3835 2015 edition.][60932]
3839 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3840 and `-C profile-use` flags.][61268] For more information on how to use profile
3841 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3842 - [The `rust-lldb` wrapper script should now work again.][61827]
3846 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3850 - [`BufReader::buffer`]
3851 - [`BufWriter::buffer`]
3852 - [`Cell::from_mut`]
3853 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3854 - [`DoubleEndedIterator::nth_back`]
3856 - [`Wrapping::reverse_bits`]
3857 - [`i128::reverse_bits`]
3858 - [`i16::reverse_bits`]
3859 - [`i32::reverse_bits`]
3860 - [`i64::reverse_bits`]
3861 - [`i8::reverse_bits`]
3862 - [`isize::reverse_bits`]
3863 - [`slice::copy_within`]
3864 - [`u128::reverse_bits`]
3865 - [`u16::reverse_bits`]
3866 - [`u32::reverse_bits`]
3867 - [`u64::reverse_bits`]
3868 - [`u8::reverse_bits`]
3869 - [`usize::reverse_bits`]
3873 - [`Cargo.lock` files are now included by default when publishing executable crates
3874 with executables.][cargo/7026]
3875 - [You can now specify `default-run="foo"` in `[package]` to specify the
3876 default executable to use for `cargo run`.][cargo/7056]
3883 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3884 Please transition your code to using the `..=` syntax for inclusive
3886 - [Using a trait object without the `dyn` will now warn by default.][61203]
3887 Please transition your code to use `dyn Trait` for trait objects instead.
3889 [62228]: https://github.com/rust-lang/rust/pull/62228/
3890 [62235]: https://github.com/rust-lang/rust/pull/62235/
3891 [61802]: https://github.com/rust-lang/rust/pull/61802/
3892 [61827]: https://github.com/rust-lang/rust/pull/61827/
3893 [61547]: https://github.com/rust-lang/rust/pull/61547/
3894 [61682]: https://github.com/rust-lang/rust/pull/61682/
3895 [61268]: https://github.com/rust-lang/rust/pull/61268/
3896 [61342]: https://github.com/rust-lang/rust/pull/61342/
3897 [61347]: https://github.com/rust-lang/rust/pull/61347/
3898 [61100]: https://github.com/rust-lang/rust/pull/61100/
3899 [61203]: https://github.com/rust-lang/rust/pull/61203/
3900 [61229]: https://github.com/rust-lang/rust/pull/61229/
3901 [60932]: https://github.com/rust-lang/rust/pull/60932/
3902 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3903 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3904 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3905 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3906 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3907 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3908 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3909 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3910 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3911 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3912 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3913 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3914 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3915 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3916 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3917 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3918 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3919 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3920 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3921 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3922 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3923 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3924 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3927 Version 1.36.0 (2019-07-04)
3928 ==========================
3932 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3933 - [The order of traits in trait objects no longer affects the semantics of that
3934 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3935 `dyn fmt::Debug + Send`, where this was previously not the case.
3939 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3940 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3941 - [`mem::needs_drop` is now available as a const fn.][60364]
3942 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3943 - [`String` now implements `BorrowMut<str>`.][60404]
3944 - [`io::Cursor` now implements `Default`.][60234]
3945 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3946 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3947 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3948 environment has access to heap memory allocation.
3949 - [`String` now implements `From<&String>`.][59825]
3950 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3951 return a tuple of each argument when there is multiple arguments.
3952 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3957 - [`VecDeque::rotate_left`]
3958 - [`VecDeque::rotate_right`]
3959 - [`Iterator::copied`]
3961 - [`io::IoSliceMut`]
3962 - [`Read::read_vectored`]
3963 - [`Write::write_vectored`]
3964 - [`str::as_mut_ptr`]
3965 - [`mem::MaybeUninit`]
3966 - [`pointer::align_offset`]
3967 - [`future::Future`]
3969 - [`task::RawWaker`]
3970 - [`task::RawWakerVTable`]
3976 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3977 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3979 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3983 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3990 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3991 longer recommended, and will be deprecated in 1.39.0.
3993 [60318]: https://github.com/rust-lang/rust/pull/60318/
3994 [60364]: https://github.com/rust-lang/rust/pull/60364/
3995 [60370]: https://github.com/rust-lang/rust/pull/60370/
3996 [60404]: https://github.com/rust-lang/rust/pull/60404/
3997 [60234]: https://github.com/rust-lang/rust/pull/60234/
3998 [60244]: https://github.com/rust-lang/rust/pull/60244/
3999 [58623]: https://github.com/rust-lang/rust/pull/58623/
4000 [59648]: https://github.com/rust-lang/rust/pull/59648/
4001 [59675]: https://github.com/rust-lang/rust/pull/59675/
4002 [59825]: https://github.com/rust-lang/rust/pull/59825/
4003 [59826]: https://github.com/rust-lang/rust/pull/59826/
4004 [59445]: https://github.com/rust-lang/rust/pull/59445/
4005 [59114]: https://github.com/rust-lang/rust/pull/59114/
4006 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4007 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4008 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4009 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4010 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4011 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4012 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4013 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4014 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4015 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4016 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4017 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4018 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4019 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4020 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4021 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4022 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4023 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4024 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4025 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4028 Version 1.35.0 (2019-05-23)
4029 ==========================
4033 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4034 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4035 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4037 unsafe fn call_unsafe(func: unsafe fn()) {
4042 unsafe { call_unsafe(|| {}); }
4049 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4050 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4051 - [Added the `wasm32-unknown-wasi` target.][59464]
4056 - [`Thread` will now show its ID in `Debug` output.][59460]
4057 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4058 - [`alloc::System` now implements `Default`.][59451]
4059 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4061 - [`char::{ToLowercase, ToUppercase}` now
4062 implement `ExactSizeIterator`.][58778]
4063 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4064 - [Removed the `Read` trait bounds
4065 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4066 - [You can now call the `dbg!` macro without any parameters to print the file
4067 and line where it is called.][57847]
4068 - [In place ASCII case conversions are now up to 4× faster.][59283]
4069 e.g. `str::make_ascii_lowercase`
4070 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4077 - [`RefCell::replace_with`]
4078 - [`RefCell::map_split`]
4080 - [`Range::contains`]
4081 - [`RangeFrom::contains`]
4082 - [`RangeTo::contains`]
4083 - [`RangeInclusive::contains`]
4084 - [`RangeToInclusive::contains`]
4085 - [`Option::copied`]
4089 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4090 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4095 - [The Rust toolchain is now available natively for musl based distros.][58575]
4097 [59460]: https://github.com/rust-lang/rust/pull/59460/
4098 [59464]: https://github.com/rust-lang/rust/pull/59464/
4099 [59500]: https://github.com/rust-lang/rust/pull/59500/
4100 [59512]: https://github.com/rust-lang/rust/pull/59512/
4101 [59580]: https://github.com/rust-lang/rust/pull/59580/
4102 [59283]: https://github.com/rust-lang/rust/pull/59283/
4103 [59451]: https://github.com/rust-lang/rust/pull/59451/
4104 [59076]: https://github.com/rust-lang/rust/pull/59076/
4105 [58778]: https://github.com/rust-lang/rust/pull/58778/
4106 [58717]: https://github.com/rust-lang/rust/pull/58717/
4107 [58369]: https://github.com/rust-lang/rust/pull/58369/
4108 [58423]: https://github.com/rust-lang/rust/pull/58423/
4109 [58080]: https://github.com/rust-lang/rust/pull/58080/
4110 [57847]: https://github.com/rust-lang/rust/pull/57847/
4111 [58575]: https://github.com/rust-lang/rust/pull/58575
4112 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4113 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4114 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4115 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4116 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4117 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4118 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4119 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4120 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4121 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4122 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4123 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4125 Version 1.34.2 (2019-05-14)
4126 ===========================
4128 * [Destabilize the `Error::type_id` function due to a security
4129 vulnerability][60785] ([CVE-2019-12083])
4131 [60785]: https://github.com/rust-lang/rust/pull/60785
4132 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4134 Version 1.34.1 (2019-04-25)
4135 ===========================
4137 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4138 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4139 * [Fix Clippy panic when checking some macros][clippy/3805]
4141 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4142 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4143 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4145 Version 1.34.0 (2019-04-11)
4146 ==========================
4150 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4151 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4153 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4154 `#[attr{}]` procedural macros.][57367]
4155 - [You can now write `extern crate self as foo;`][57407] to import your
4156 crate's root into the extern prelude.
4161 - [You can now target `riscv64imac-unknown-none-elf` and
4162 `riscv64gc-unknown-none-elf`.][58406]
4163 - [You can now enable linker plugin LTO optimisations with
4164 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4165 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4167 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4172 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4173 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4174 the `Hash` trait to create an iterator.
4175 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4176 methods.][58421] Most notably you no longer require the `Ord` trait to create
4178 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4179 for all numeric types.][58044]
4180 - [Indexing a `str` is now generic over all types that
4181 implement `SliceIndex<str>`.][57604]
4182 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4183 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4184 produce a warning if their returning type is unused.
4185 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4186 `overflowing_pow` are now available for all numeric types.][57873] These are
4187 equivalent to methods such as `wrapping_add` for the `pow` operation.
4195 * [`Error::type_id`]
4196 * [`atomic::AtomicI16`]
4197 * [`atomic::AtomicI32`]
4198 * [`atomic::AtomicI64`]
4199 * [`atomic::AtomicI8`]
4200 * [`atomic::AtomicU16`]
4201 * [`atomic::AtomicU32`]
4202 * [`atomic::AtomicU64`]
4203 * [`atomic::AtomicU8`]
4204 * [`convert::Infallible`]
4205 * [`convert::TryFrom`]
4206 * [`convert::TryInto`]
4208 * [`iter::successors`]
4209 * [`num::NonZeroI128`]
4210 * [`num::NonZeroI16`]
4211 * [`num::NonZeroI32`]
4212 * [`num::NonZeroI64`]
4213 * [`num::NonZeroI8`]
4214 * [`num::NonZeroIsize`]
4215 * [`slice::sort_by_cached_key`]
4216 * [`str::escape_debug`]
4217 * [`str::escape_default`]
4218 * [`str::escape_unicode`]
4219 * [`str::split_ascii_whitespace`]
4222 * [`Instant::checked_add`]
4223 * [`Instant::checked_sub`]
4224 * [`SystemTime::checked_add`]
4225 * [`SystemTime::checked_sub`]
4229 - [You can now use alternative registries to crates.io.][cargo/6654]
4233 - [You can now use the `?` operator in your documentation tests without manually
4234 adding `fn main() -> Result<(), _> {}`.][56470]
4238 - [`Command::before_exec` is being replaced by the unsafe method
4239 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4240 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4241 can now use `const` functions in `static` variables.
4243 [58370]: https://github.com/rust-lang/rust/pull/58370/
4244 [58406]: https://github.com/rust-lang/rust/pull/58406/
4245 [58421]: https://github.com/rust-lang/rust/pull/58421/
4246 [58166]: https://github.com/rust-lang/rust/pull/58166/
4247 [58044]: https://github.com/rust-lang/rust/pull/58044/
4248 [58057]: https://github.com/rust-lang/rust/pull/58057/
4249 [58059]: https://github.com/rust-lang/rust/pull/58059/
4250 [57809]: https://github.com/rust-lang/rust/pull/57809/
4251 [57873]: https://github.com/rust-lang/rust/pull/57873/
4252 [57604]: https://github.com/rust-lang/rust/pull/57604/
4253 [57367]: https://github.com/rust-lang/rust/pull/57367/
4254 [57407]: https://github.com/rust-lang/rust/pull/57407/
4255 [57425]: https://github.com/rust-lang/rust/pull/57425/
4256 [57106]: https://github.com/rust-lang/rust/pull/57106/
4257 [56470]: https://github.com/rust-lang/rust/pull/56470/
4258 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4259 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4260 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4261 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4262 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4263 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4264 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4265 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4266 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4267 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4268 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4269 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4270 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4271 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4272 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4273 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4274 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4275 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4276 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4277 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4278 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4279 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4280 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4281 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4282 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4283 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4284 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4285 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4286 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4287 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4288 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4291 Version 1.33.0 (2019-02-28)
4292 ==========================
4296 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4297 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4298 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4299 E.g. You can have match statement on a `u8` that covers `0..=255` and
4300 you would no longer be required to have a `_ => unreachable!()` case.
4301 - [You can now have multiple patterns in `if let` and `while let`
4302 expressions.][57532] You can do this with the same syntax as a `match`
4312 let state = Creature::Crab("Ferris");
4314 if let Creature::Crab(name) | Creature::Person(name) = state {
4315 println!("This creature's name is: {}", name);
4319 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4320 this feature will by default produce a warning as this behaviour can be
4321 unintuitive. E.g. `if let _ = 5 {}`
4322 - [You can now use `let` bindings, assignments, expression statements,
4323 and irrefutable pattern destructuring in const functions.][57175]
4324 - [You can now call unsafe const functions.][57067] E.g.
4326 const unsafe fn foo() -> i32 { 5 }
4327 const fn bar() -> i32 {
4331 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4332 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4333 - [You can now specify a specific alignment with the `#[repr(packed)]`
4334 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4335 with an alignment of 2 bytes and a size of 6 bytes.
4336 - [You can now import an item from a module as an `_`.][56303] This allows you to
4337 import a trait's impls, and not have the name in the namespace. E.g.
4339 use std::io::Read as _;
4341 // Allowed as there is only one `Read` in the module.
4344 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4348 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4349 command line argument.][56351]
4350 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4351 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4352 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4353 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4354 information on Rust's platform support.
4355 - [Added support for the `thumbv7neon-linux-androideabi` and
4356 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4357 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4361 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4362 functions for all numeric types.][57566]
4363 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4364 are now `const` functions for all numeric types.][57105]
4365 - [The methods `is_positive` and `is_negative` are now `const` functions for
4366 all signed numeric types.][57105]
4367 - [The `get` method for all `NonZero` types is now `const`.][57167]
4368 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4369 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4370 numeric types.][57234]
4371 - [`Ipv4Addr::new` is now a `const` function][57234]
4375 - [`unix::FileExt::read_exact_at`]
4376 - [`unix::FileExt::write_all_at`]
4377 - [`Option::transpose`]
4378 - [`Result::transpose`]
4379 - [`convert::identity`]
4382 - [`marker::PhantomPinned`]
4383 - [`Vec::resize_with`]
4384 - [`VecDeque::resize_with`]
4385 - [`Duration::as_millis`]
4386 - [`Duration::as_micros`]
4387 - [`Duration::as_nanos`]
4392 - [You can now publish crates that require a feature flag to compile with
4393 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4394 - [Cargo should now rebuild a crate if a file was modified during the initial
4399 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4400 are now deprecated in the standard library, and their usage will now produce a warning.
4401 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4403 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4405 - [Libtest no longer creates a new thread for each test when
4406 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4408 [56243]: https://github.com/rust-lang/rust/pull/56243
4409 [56303]: https://github.com/rust-lang/rust/pull/56303/
4410 [56351]: https://github.com/rust-lang/rust/pull/56351/
4411 [56362]: https://github.com/rust-lang/rust/pull/56362
4412 [56642]: https://github.com/rust-lang/rust/pull/56642/
4413 [56769]: https://github.com/rust-lang/rust/pull/56769/
4414 [56805]: https://github.com/rust-lang/rust/pull/56805
4415 [56947]: https://github.com/rust-lang/rust/pull/56947/
4416 [57049]: https://github.com/rust-lang/rust/pull/57049/
4417 [57067]: https://github.com/rust-lang/rust/pull/57067/
4418 [57105]: https://github.com/rust-lang/rust/pull/57105
4419 [57130]: https://github.com/rust-lang/rust/pull/57130/
4420 [57167]: https://github.com/rust-lang/rust/pull/57167/
4421 [57175]: https://github.com/rust-lang/rust/pull/57175/
4422 [57234]: https://github.com/rust-lang/rust/pull/57234/
4423 [57332]: https://github.com/rust-lang/rust/pull/57332/
4424 [57465]: https://github.com/rust-lang/rust/pull/57465/
4425 [57532]: https://github.com/rust-lang/rust/pull/57532/
4426 [57535]: https://github.com/rust-lang/rust/pull/57535/
4427 [57566]: https://github.com/rust-lang/rust/pull/57566/
4428 [57615]: https://github.com/rust-lang/rust/pull/57615/
4429 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4430 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4431 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4432 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4433 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4434 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4435 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4436 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4437 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4438 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4439 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4440 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4441 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4442 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4443 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4444 [platform-support]: https://forge.rust-lang.org/platform-support.html
4446 Version 1.32.0 (2019-01-17)
4447 ==========================
4452 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4453 operator allows you to specify zero or one repetitions similar to the `*` and
4455 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4456 now always resolve to the item (`enum`, `struct`, etc.) available in the
4457 module if present, before resolving to a external crate or an item the prelude.][56759]
4460 enum Color { Red, Green, Blue }
4466 - [You can now match against `PhantomData<T>` types.][55837]
4467 - [You can now match against literals in macros with the `literal`
4468 specifier.][56072] This will match against a literal of any type.
4469 E.g. `1`, `'A'`, `"Hello World"`
4470 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4472 struct Point(i32, i32);
4475 pub fn new(x: i32, y: i32) -> Self {
4479 pub fn is_origin(&self) -> bool {
4487 - [Self can also now be used in type definitions.][56366] E.g.
4491 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4494 Cons(T, Box<Self>) // likewise here
4497 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4498 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4502 - [The default allocator has changed from jemalloc to the default allocator on
4503 your system.][55238] The compiler itself on Linux & macOS will still use
4504 jemalloc, but programs compiled with it will use the system allocator.
4505 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4509 - [`PathBuf` now implements `FromStr`.][55148]
4510 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4511 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4512 easily debug expressions in your rust program. E.g.
4515 let b = dbg!(a * 2) + 1;
4516 // ^-- prints: [src/main.rs:4] a * 2 = 4
4520 The following APIs are now `const` functions and can be used in a
4524 - [`UnsafeCell::get`]
4525 - [`char::is_ascii`]
4527 - [`ManuallyDrop::new`]
4528 - [`ManuallyDrop::into_inner`]
4529 - [`RangeInclusive::start`]
4530 - [`RangeInclusive::end`]
4531 - [`NonNull::as_ptr`]
4534 - [`Duration::as_secs`]
4535 - [`Duration::subsec_millis`]
4536 - [`Duration::subsec_micros`]
4537 - [`Duration::subsec_nanos`]
4539 - [`Ipv4Addr::is_unspecified`]
4541 - [`Ipv6Addr::octets`]
4545 - [`i8::to_be_bytes`]
4546 - [`i8::to_le_bytes`]
4547 - [`i8::to_ne_bytes`]
4548 - [`i8::from_be_bytes`]
4549 - [`i8::from_le_bytes`]
4550 - [`i8::from_ne_bytes`]
4551 - [`i16::to_be_bytes`]
4552 - [`i16::to_le_bytes`]
4553 - [`i16::to_ne_bytes`]
4554 - [`i16::from_be_bytes`]
4555 - [`i16::from_le_bytes`]
4556 - [`i16::from_ne_bytes`]
4557 - [`i32::to_be_bytes`]
4558 - [`i32::to_le_bytes`]
4559 - [`i32::to_ne_bytes`]
4560 - [`i32::from_be_bytes`]
4561 - [`i32::from_le_bytes`]
4562 - [`i32::from_ne_bytes`]
4563 - [`i64::to_be_bytes`]
4564 - [`i64::to_le_bytes`]
4565 - [`i64::to_ne_bytes`]
4566 - [`i64::from_be_bytes`]
4567 - [`i64::from_le_bytes`]
4568 - [`i64::from_ne_bytes`]
4569 - [`i128::to_be_bytes`]
4570 - [`i128::to_le_bytes`]
4571 - [`i128::to_ne_bytes`]
4572 - [`i128::from_be_bytes`]
4573 - [`i128::from_le_bytes`]
4574 - [`i128::from_ne_bytes`]
4575 - [`isize::to_be_bytes`]
4576 - [`isize::to_le_bytes`]
4577 - [`isize::to_ne_bytes`]
4578 - [`isize::from_be_bytes`]
4579 - [`isize::from_le_bytes`]
4580 - [`isize::from_ne_bytes`]
4581 - [`u8::to_be_bytes`]
4582 - [`u8::to_le_bytes`]
4583 - [`u8::to_ne_bytes`]
4584 - [`u8::from_be_bytes`]
4585 - [`u8::from_le_bytes`]
4586 - [`u8::from_ne_bytes`]
4587 - [`u16::to_be_bytes`]
4588 - [`u16::to_le_bytes`]
4589 - [`u16::to_ne_bytes`]
4590 - [`u16::from_be_bytes`]
4591 - [`u16::from_le_bytes`]
4592 - [`u16::from_ne_bytes`]
4593 - [`u32::to_be_bytes`]
4594 - [`u32::to_le_bytes`]
4595 - [`u32::to_ne_bytes`]
4596 - [`u32::from_be_bytes`]
4597 - [`u32::from_le_bytes`]
4598 - [`u32::from_ne_bytes`]
4599 - [`u64::to_be_bytes`]
4600 - [`u64::to_le_bytes`]
4601 - [`u64::to_ne_bytes`]
4602 - [`u64::from_be_bytes`]
4603 - [`u64::from_le_bytes`]
4604 - [`u64::from_ne_bytes`]
4605 - [`u128::to_be_bytes`]
4606 - [`u128::to_le_bytes`]
4607 - [`u128::to_ne_bytes`]
4608 - [`u128::from_be_bytes`]
4609 - [`u128::from_le_bytes`]
4610 - [`u128::from_ne_bytes`]
4611 - [`usize::to_be_bytes`]
4612 - [`usize::to_le_bytes`]
4613 - [`usize::to_ne_bytes`]
4614 - [`usize::from_be_bytes`]
4615 - [`usize::from_le_bytes`]
4616 - [`usize::from_ne_bytes`]
4620 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4621 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4625 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4629 - [The argument types for AVX's
4630 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4631 been changed from `*const` to `*mut` as the previous implementation
4635 [55148]: https://github.com/rust-lang/rust/pull/55148/
4636 [55238]: https://github.com/rust-lang/rust/pull/55238/
4637 [55280]: https://github.com/rust-lang/rust/pull/55280/
4638 [55610]: https://github.com/rust-lang/rust/pull/55610/
4639 [55663]: https://github.com/rust-lang/rust/pull/55663/
4640 [55702]: https://github.com/rust-lang/rust/pull/55702/
4641 [55837]: https://github.com/rust-lang/rust/pull/55837/
4642 [55843]: https://github.com/rust-lang/rust/pull/55843/
4643 [56072]: https://github.com/rust-lang/rust/pull/56072/
4644 [56245]: https://github.com/rust-lang/rust/pull/56245/
4645 [56365]: https://github.com/rust-lang/rust/pull/56365/
4646 [56366]: https://github.com/rust-lang/rust/pull/56366/
4647 [56395]: https://github.com/rust-lang/rust/pull/56395/
4648 [56759]: https://github.com/rust-lang/rust/pull/56759/
4649 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4650 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4651 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4652 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4653 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4654 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4655 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4656 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4657 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4658 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4659 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4660 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4661 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4662 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4663 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4664 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4665 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4666 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4667 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4668 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4669 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4670 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4671 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4672 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4673 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4674 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4675 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4676 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4677 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4678 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4679 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4680 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4681 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4682 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4683 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4684 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4685 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4686 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4687 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4688 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4689 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4690 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4691 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4692 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4693 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4694 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4695 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4696 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4697 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4698 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4699 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4700 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4701 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4702 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4703 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4704 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4705 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4706 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4707 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4708 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4709 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4710 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4711 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4712 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4713 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4714 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4715 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4716 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4717 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4718 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4719 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4720 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4721 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4722 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4723 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4724 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4725 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4726 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4727 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4728 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4729 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4730 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4731 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4732 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4733 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4734 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4735 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4736 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4737 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4738 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4739 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4740 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4741 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4744 Version 1.31.1 (2018-12-20)
4745 ===========================
4747 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4748 - [Fix broken go-to-definition in RLS][rls/1171]
4749 - [Fix infinite loop on hover in RLS][rls/1170]
4751 [56562]: https://github.com/rust-lang/rust/pull/56562
4752 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4753 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4755 Version 1.31.0 (2018-12-06)
4756 ==========================
4760 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4761 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4762 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4763 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4765 - [You can now define and use `const` functions.][54835] These are currently
4766 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4767 [language reference][const-reference] for what exactly is available.
4768 - [You can now use tool lints, which allow you to scope lints from external
4769 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4770 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4771 a crate, not just in exported functions.][54451]
4772 - [You can now use parentheses in pattern matches.][54497]
4776 - [Updated musl to 1.1.20][54430]
4780 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4781 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4782 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4783 into `Option<&mut T>` using the `From` trait.][53218]
4784 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4789 - [`slice::align_to`]
4790 - [`slice::align_to_mut`]
4791 - [`slice::chunks_exact`]
4792 - [`slice::chunks_exact_mut`]
4793 - [`slice::rchunks`]
4794 - [`slice::rchunks_mut`]
4795 - [`slice::rchunks_exact`]
4796 - [`slice::rchunks_exact_mut`]
4797 - [`Option::replace`]
4801 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4802 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4803 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4805 [52813]: https://github.com/rust-lang/rust/pull/52813/
4806 [53218]: https://github.com/rust-lang/rust/pull/53218/
4807 [54057]: https://github.com/rust-lang/rust/pull/54057/
4808 [54240]: https://github.com/rust-lang/rust/pull/54240/
4809 [54430]: https://github.com/rust-lang/rust/pull/54430/
4810 [54451]: https://github.com/rust-lang/rust/pull/54451/
4811 [54497]: https://github.com/rust-lang/rust/pull/54497/
4812 [54778]: https://github.com/rust-lang/rust/pull/54778/
4813 [54835]: https://github.com/rust-lang/rust/pull/54835/
4814 [54870]: https://github.com/rust-lang/rust/pull/54870/
4815 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4816 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4817 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4818 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4819 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4820 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4821 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4822 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4823 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4824 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4825 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4826 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4827 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4828 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4830 Version 1.30.1 (2018-11-08)
4831 ===========================
4833 - [Fixed overflow ICE in rustdoc][54199]
4834 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4836 [54199]: https://github.com/rust-lang/rust/pull/54199
4837 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4839 Version 1.30.0 (2018-10-25)
4840 ==========================
4844 - [Procedural macros are now available.][52081] These kinds of macros allow for
4845 more powerful code generation. There is a [new chapter available][proc-macros]
4846 in the Rust Programming Language book that goes further in depth.
4847 - [You can now use keywords as identifiers using the raw identifiers
4848 syntax (`r#`),][53236] e.g. `let r#for = true;`
4849 - [Using anonymous parameters in traits is now deprecated with a warning and
4850 will be a hard error in the 2018 edition.][53272]
4851 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4852 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4853 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4854 Previously, using a external crate in a module without a use statement
4855 required `let json = ::serde_json::from_str(foo);` but can now be written
4856 as `let json = serde_json::from_str(foo);`.
4857 - [You can now apply the `#[used]` attribute to static items to prevent the
4858 compiler from optimising them away, even if they appear to be unused,][51363]
4859 e.g. `#[used] static FOO: u32 = 1;`
4860 - [You can now import and reexport macros from other crates with the `use`
4861 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4862 the root module of the crate. If your macro relies on calling other local
4863 macros, it is recommended to export with the
4864 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4866 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4867 using the `vis` specifier.][53370]
4868 - [Non-macro attributes now allow all forms of literals, not just
4869 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4870 write `#[attr(true)]`.
4871 - [You can now specify a function to handle a panic in the Rust runtime with the
4872 `#[panic_handler]` attribute.][51366]
4876 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4877 - [Added the `aarch64-unknown-netbsd` target][53165]
4878 - [Upgraded to LLVM 8.][53611]
4882 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4886 - [`Ipv4Addr::BROADCAST`]
4887 - [`Ipv4Addr::LOCALHOST`]
4888 - [`Ipv4Addr::UNSPECIFIED`]
4889 - [`Ipv6Addr::LOCALHOST`]
4890 - [`Ipv6Addr::UNSPECIFIED`]
4891 - [`Iterator::find_map`]
4893 The following methods are replacement methods for `trim_left`, `trim_right`,
4894 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4896 - [`str::trim_end_matches`]
4898 - [`str::trim_start_matches`]
4899 - [`str::trim_start`]
4903 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4904 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4905 equivalent to calling `rustdoc --error-format=json`.
4906 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4910 - [`rustdoc` allows you to specify what edition to treat your code as with the
4911 `--edition` option.][54057]
4912 - [`rustdoc` now has the `--color` (specify whether to output color) and
4913 `--error-format` (specify error format, e.g. `json`) options.][53003]
4914 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4915 debug symbols.][53774]
4916 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4917 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4919 [50911]: https://github.com/rust-lang/rust/pull/50911/
4920 [51363]: https://github.com/rust-lang/rust/pull/51363/
4921 [51366]: https://github.com/rust-lang/rust/pull/51366/
4922 [52081]: https://github.com/rust-lang/rust/pull/52081/
4923 [53003]: https://github.com/rust-lang/rust/pull/53003/
4924 [53033]: https://github.com/rust-lang/rust/pull/53033/
4925 [53044]: https://github.com/rust-lang/rust/pull/53044/
4926 [53165]: https://github.com/rust-lang/rust/pull/53165/
4927 [53611]: https://github.com/rust-lang/rust/pull/53611/
4928 [53236]: https://github.com/rust-lang/rust/pull/53236/
4929 [53272]: https://github.com/rust-lang/rust/pull/53272/
4930 [53370]: https://github.com/rust-lang/rust/pull/53370/
4931 [53459]: https://github.com/rust-lang/rust/pull/53459/
4932 [53774]: https://github.com/rust-lang/rust/pull/53774/
4933 [53822]: https://github.com/rust-lang/rust/pull/53822/
4934 [54057]: https://github.com/rust-lang/rust/pull/54057/
4935 [54404]: https://github.com/rust-lang/rust/pull/54404/
4936 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4937 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4938 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4939 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4941 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4942 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4943 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4944 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4945 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4946 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4947 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4948 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4949 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4950 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4953 Version 1.29.2 (2018-10-11)
4954 ===========================
4956 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4957 - The `rls-preview` component on the windows-gnu targets has been restored.
4959 [54639]: https://github.com/rust-lang/rust/pull/54639
4962 Version 1.29.1 (2018-09-25)
4963 ===========================
4968 - The standard library's `str::repeat` function contained an out of bounds write
4969 caused by an integer overflow. This has been fixed by deterministically
4970 panicking when an overflow happens.
4972 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4976 Version 1.29.0 (2018-09-13)
4977 ==========================
4981 - [Bumped minimum LLVM version to 5.0.][51899]
4982 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4983 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4984 - [Upgraded to LLVM 7.][51966]
4988 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4989 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4990 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4991 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4993 - [`Cell<T>` now allows `T` to be unsized.][50494]
4994 - [`SocketAddr` is now stable on Redox.][52656]
4999 - [`Iterator::flatten`]
5004 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5005 `--locked` to disable this behavior.
5006 - [`cargo-install` will now allow you to cross compile an install
5007 using `--target`.][cargo/5614]
5008 - [Added the `cargo-fix` subcommand to automatically move project code from
5009 2015 edition to 2018.][cargo/5723]
5010 - [`cargo doc` can now optionally document private types using the
5011 `--document-private-items` flag.][cargo/5543]
5015 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5016 the specified level to that level.][52354] For example `--cap-lints warn`
5017 will demote `deny` and `forbid` lints to `warn`.
5018 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5019 fails and `101` if there is a panic.][52197]
5020 - [A preview of clippy has been made available through rustup.][51122]
5021 You can install the preview with `rustup component add clippy-preview`.
5025 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5026 Use `str::get_unchecked(begin..end)` instead.
5027 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5028 Consider using the `home_dir` function from
5029 https://crates.io/crates/dirs instead.
5030 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5031 - [`cfg` attributes and `--cfg` command line flags are now more
5032 strictly validated.][53893]
5034 [53893]: https://github.com/rust-lang/rust/pull/53893/
5035 [52861]: https://github.com/rust-lang/rust/pull/52861/
5036 [51966]: https://github.com/rust-lang/rust/pull/51966/
5037 [52656]: https://github.com/rust-lang/rust/pull/52656/
5038 [52239]: https://github.com/rust-lang/rust/pull/52239/
5039 [52330]: https://github.com/rust-lang/rust/pull/52330/
5040 [52354]: https://github.com/rust-lang/rust/pull/52354/
5041 [52402]: https://github.com/rust-lang/rust/pull/52402/
5042 [52197]: https://github.com/rust-lang/rust/pull/52197/
5043 [51807]: https://github.com/rust-lang/rust/pull/51807/
5044 [51899]: https://github.com/rust-lang/rust/pull/51899/
5045 [51912]: https://github.com/rust-lang/rust/pull/51912/
5046 [51619]: https://github.com/rust-lang/rust/pull/51619/
5047 [51656]: https://github.com/rust-lang/rust/pull/51656/
5048 [51178]: https://github.com/rust-lang/rust/pull/51178/
5049 [51122]: https://github.com/rust-lang/rust/pull/51122
5050 [50494]: https://github.com/rust-lang/rust/pull/50494/
5051 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5052 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5053 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5054 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5055 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5056 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5057 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5060 Version 1.28.0 (2018-08-02)
5061 ===========================
5065 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5066 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5067 the inner type across Foreign Function Interface (FFI) boundaries.
5068 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5069 and can now be used as identifiers.][51196]
5070 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5071 stable.][51241] This will allow users to specify a global allocator for
5073 - [Unit test functions marked with the `#[test]` attribute can now return
5074 `Result<(), E: Debug>` in addition to `()`.][51298]
5075 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5076 allows macros to easily target lifetimes.
5080 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5081 prioritise making smaller binary sizes. `z` is the same as `s` with the
5082 exception that it does not vectorise loops, which typically results in an even
5084 - [The short error format is now stable.][49546] Specified with
5085 `--error-format=short` this option will provide a more compressed output of
5086 rust error messages.
5087 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5088 - [Reduced the number of allocations in the macro parser.][50855] This can
5089 improve compile times of macro heavy crates on average by 5%.
5093 - [Implemented `Default` for `&mut str`.][51306]
5094 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5095 - [Implemented `Extend` for `()`.][50234]
5096 - [The `Debug` implementation of `time::Duration` should now be more easily
5097 human readable.][50364] Previously a `Duration` of one second would printed as
5098 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5099 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5100 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5101 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5102 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5103 for `PathBuf`.][50170]
5104 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5105 and `Wrapping<i128>`.][50465]
5106 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5107 possible.][51050] This can provide up to a 40% speed increase.
5108 - [Improved error messages when using `format!`.][50610]
5112 - [`Iterator::step_by`]
5113 - [`Path::ancestors`]
5114 - [`SystemTime::UNIX_EPOCH`]
5115 - [`alloc::GlobalAlloc`]
5117 - [`alloc::LayoutErr`]
5120 - [`alloc::alloc_zeroed`]
5121 - [`alloc::dealloc`]
5122 - [`alloc::realloc`]
5123 - [`alloc::handle_alloc_error`]
5124 - [`btree_map::Entry::or_default`]
5125 - [`fmt::Alignment`]
5126 - [`hash_map::Entry::or_default`]
5127 - [`iter::repeat_with`]
5128 - [`num::NonZeroUsize`]
5129 - [`num::NonZeroU128`]
5130 - [`num::NonZeroU16`]
5131 - [`num::NonZeroU32`]
5132 - [`num::NonZeroU64`]
5133 - [`num::NonZeroU8`]
5134 - [`ops::RangeBounds`]
5135 - [`slice::SliceIndex`]
5136 - [`slice::from_mut`]
5137 - [`slice::from_ref`]
5138 - [`{Any + Send + Sync}::downcast_mut`]
5139 - [`{Any + Send + Sync}::downcast_ref`]
5140 - [`{Any + Send + Sync}::is`]
5144 - [Cargo will now no longer allow you to publish crates with build scripts that
5145 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5146 considered to be immutable.
5150 - [The `suggestion_applicability` field in `rustc`'s json output is now
5151 stable.][50486] This will allow dev tools to check whether a code suggestion
5152 would apply to them.
5156 - [Rust will consider trait objects with duplicated constraints to be the same
5157 type as without the duplicated constraint.][51276] For example the below code will
5158 now fail to compile.
5163 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5166 impl Trait + Send + Send {
5167 fn test(&self) { println!("two"); }
5171 [49546]: https://github.com/rust-lang/rust/pull/49546/
5172 [50143]: https://github.com/rust-lang/rust/pull/50143/
5173 [50170]: https://github.com/rust-lang/rust/pull/50170/
5174 [50234]: https://github.com/rust-lang/rust/pull/50234/
5175 [50265]: https://github.com/rust-lang/rust/pull/50265/
5176 [50364]: https://github.com/rust-lang/rust/pull/50364/
5177 [50385]: https://github.com/rust-lang/rust/pull/50385/
5178 [50465]: https://github.com/rust-lang/rust/pull/50465/
5179 [50486]: https://github.com/rust-lang/rust/pull/50486/
5180 [50554]: https://github.com/rust-lang/rust/pull/50554/
5181 [50610]: https://github.com/rust-lang/rust/pull/50610/
5182 [50855]: https://github.com/rust-lang/rust/pull/50855/
5183 [51050]: https://github.com/rust-lang/rust/pull/51050/
5184 [51196]: https://github.com/rust-lang/rust/pull/51196/
5185 [51241]: https://github.com/rust-lang/rust/pull/51241/
5186 [51276]: https://github.com/rust-lang/rust/pull/51276/
5187 [51298]: https://github.com/rust-lang/rust/pull/51298/
5188 [51306]: https://github.com/rust-lang/rust/pull/51306/
5189 [51562]: https://github.com/rust-lang/rust/pull/51562/
5190 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5191 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5192 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5193 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5194 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5195 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5196 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5197 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5198 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5199 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5200 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5201 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5202 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5203 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5204 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5205 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5206 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5207 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5208 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5209 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5210 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5211 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5212 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5213 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5214 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5215 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5216 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5217 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5218 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5219 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5221 Version 1.27.2 (2018-07-20)
5222 ===========================
5227 - The borrow checker was fixed to avoid potential unsoundness when using
5228 match ergonomics: [#52213][52213].
5230 [52213]: https://github.com/rust-lang/rust/issues/52213
5232 Version 1.27.1 (2018-07-10)
5233 ===========================
5238 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5239 when running, which enabled executing code as some other user on a
5240 given machine. This release fixes that vulnerability; you can read
5241 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5243 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5248 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5249 match ergonomics: [#51415][51415], [#49534][49534].
5251 [51415]: https://github.com/rust-lang/rust/issues/51415
5252 [49534]: https://github.com/rust-lang/rust/issues/49534
5253 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5254 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5256 Version 1.27.0 (2018-06-21)
5257 ==========================
5261 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5262 be used as an identifier.
5263 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5264 bare `Trait` syntax, and should make it clearer when being used in tandem with
5265 `impl Trait` because it is equivalent to the following syntax:
5266 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5267 `Box<Trait> == Box<dyn Trait>`.
5268 - [Attributes on generic parameters such as types and lifetimes are
5269 now stable.][48851] e.g.
5270 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5271 - [The `#[must_use]` attribute can now also be used on functions as well as
5272 types.][48925] It provides a lint that by default warns users when the
5273 value returned by a function has not been used.
5277 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5281 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5282 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5283 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5284 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5285 the `cfg` attribute.
5286 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5287 std are now available in core.][49896]
5288 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5290 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5291 that the operation isn't done in place.
5292 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5293 the `#[must_use]` attribute][49533] to warn about unused potentially
5294 expensive allocations.
5298 - [`DoubleEndedIterator::rfind`]
5299 - [`DoubleEndedIterator::rfold`]
5300 - [`DoubleEndedIterator::try_rfold`]
5301 - [`Duration::from_micros`]
5302 - [`Duration::from_nanos`]
5303 - [`Duration::subsec_micros`]
5304 - [`Duration::subsec_millis`]
5305 - [`HashMap::remove_entry`]
5306 - [`Iterator::try_fold`]
5307 - [`Iterator::try_for_each`]
5309 - [`Option::filter`]
5310 - [`String::replace_range`]
5311 - [`Take::set_limit`]
5312 - [`hint::unreachable_unchecked`]
5313 - [`os::unix::process::parent_id`]
5314 - [`ptr::swap_nonoverlapping`]
5315 - [`slice::rsplit_mut`]
5317 - [`slice::swap_with_slice`]
5321 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5322 `readme`, and `repository` fields.][cargo/5386]
5323 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5324 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5325 a different directory than `target` for placing compilation artifacts.
5326 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5327 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5328 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5329 where cargo would infer a binary, Cargo will produce a warning. You can
5330 disable this feature ahead of time by setting any of the following to false:
5331 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5332 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5333 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5337 - [Added “The Rustc book” into the official documentation.][49707]
5338 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5339 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5343 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5344 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5345 compile, `"".is_empty()` will still compile.
5346 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5347 will only print the inner type.][48553] E.g.
5348 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5349 not `AtomicBool(true)`.
5350 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5351 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5352 alignment should cover all use cases.
5353 - The `.description()` method on the `std::error::Error` trait
5354 [has been soft-deprecated][50163]. It is no longer required to implement it.
5356 [48553]: https://github.com/rust-lang/rust/pull/48553/
5357 [48851]: https://github.com/rust-lang/rust/pull/48851/
5358 [48925]: https://github.com/rust-lang/rust/pull/48925/
5359 [49533]: https://github.com/rust-lang/rust/pull/49533/
5360 [49623]: https://github.com/rust-lang/rust/pull/49623/
5361 [49630]: https://github.com/rust-lang/rust/pull/49630/
5362 [49664]: https://github.com/rust-lang/rust/pull/49664/
5363 [49699]: https://github.com/rust-lang/rust/pull/49699/
5364 [49707]: https://github.com/rust-lang/rust/pull/49707/
5365 [49896]: https://github.com/rust-lang/rust/pull/49896/
5366 [49968]: https://github.com/rust-lang/rust/pull/49968/
5367 [50163]: https://github.com/rust-lang/rust/pull/50163
5368 [50177]: https://github.com/rust-lang/rust/pull/50177/
5369 [50378]: https://github.com/rust-lang/rust/pull/50378/
5370 [50423]: https://github.com/rust-lang/rust/pull/50423/
5371 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5372 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5373 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5374 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5375 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5376 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5377 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5378 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5379 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5380 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5381 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5382 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5383 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5384 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5385 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5386 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5387 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5388 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5389 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5390 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5391 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5392 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5393 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5394 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5395 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5396 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5397 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5398 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5399 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5402 Version 1.26.2 (2018-06-05)
5403 ==========================
5408 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5410 [51117]: https://github.com/rust-lang/rust/issues/51117
5413 Version 1.26.1 (2018-05-29)
5414 ==========================
5419 - [RLS now works on Windows.][50646]
5420 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5426 - [`fn main() -> impl Trait` no longer works for non-Termination
5428 This reverts an accidental stabilization.
5429 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5430 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5432 [50646]: https://github.com/rust-lang/rust/issues/50646
5433 [50656]: https://github.com/rust-lang/rust/pull/50656
5434 [50812]: https://github.com/rust-lang/rust/pull/50812
5435 [50950]: https://github.com/rust-lang/rust/issues/50950
5436 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5438 Version 1.26.0 (2018-05-10)
5439 ==========================
5443 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5444 implement either or both traits.][49299]
5445 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5446 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5447 lifetime can be elided.][49458]
5448 - [`impl Trait` is now stable allowing you to have abstract types in returns
5449 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5450 `fn open(path: impl AsRef<Path>)`.
5451 - [Pattern matching will now automatically apply dereferences.][49394]
5452 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5453 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5454 - [A lot of operations are now available in a const context.][46882] E.g. You
5455 can now index into constant arrays, reference and dereference into constants,
5456 and use tuple struct constructors.
5457 - [Fixed entry slice patterns are now stable.][48516] E.g.
5459 let points = [1, 2, 3, 4];
5461 [1, 2, 3, 4] => println!("All points were sequential."),
5462 _ => println!("Not all points were sequential."),
5469 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5470 - [Fixed exponential projection complexity on nested types.][48296]
5471 This can provide up to a ~12% reduction in compile times for certain crates.
5472 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5473 to remap path prefixes outputted by the compiler.
5474 - [Added `powerpc-unknown-netbsd` target.][48281]
5478 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5479 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5480 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5481 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5482 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5483 - [`ascii::escape_default` is now available in libcore.][48735]
5484 - [Trailing commas are now supported in std and core macros.][48056]
5485 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5486 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5491 - [`*const T::copy_to_nonoverlapping`]
5492 - [`*const T::copy_to`]
5493 - [`*const T::read_unaligned`]
5494 - [`*const T::read_volatile`]
5495 - [`*const T::read`]
5497 - [`*const T::wrapping_add`]
5498 - [`*const T::wrapping_sub`]
5500 - [`*mut T::copy_to_nonoverlapping`]
5501 - [`*mut T::copy_to`]
5502 - [`*mut T::read_unaligned`]
5503 - [`*mut T::read_volatile`]
5505 - [`*mut T::replace`]
5508 - [`*mut T::wrapping_add`]
5509 - [`*mut T::wrapping_sub`]
5510 - [`*mut T::write_bytes`]
5511 - [`*mut T::write_unaligned`]
5512 - [`*mut T::write_volatile`]
5515 - [`FromUtf8Error::as_bytes`]
5516 - [`LocalKey::try_with`]
5517 - [`Option::cloned`]
5518 - [`btree_map::Entry::and_modify`]
5519 - [`fs::read_to_string`]
5522 - [`hash_map::Entry::and_modify`]
5523 - [`iter::FusedIterator`]
5524 - [`ops::RangeInclusive`]
5525 - [`ops::RangeToInclusive`]
5527 - [`slice::rotate_left`]
5528 - [`slice::rotate_right`]
5529 - [`String::retain`]
5534 - [Cargo will now output path to custom commands when `-v` is
5535 passed with `--list`][cargo/5041]
5536 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5540 - [The second edition of "The Rust Programming Language" book is now recommended
5541 over the first.][48404]
5546 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5547 syntax is now invalid.
5549 use std::ops::Fn as dyn;
5550 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5552 - [The result of dereferences are no longer promoted to `'static`.][47408]
5556 const PAIR: &(i32, i32) = &(0, 1);
5557 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5560 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5561 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5563 - [Removed hoedown from rustdoc.][48274]
5564 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5566 [46882]: https://github.com/rust-lang/rust/pull/46882
5567 [47379]: https://github.com/rust-lang/rust/pull/47379
5568 [47408]: https://github.com/rust-lang/rust/pull/47408
5569 [47813]: https://github.com/rust-lang/rust/pull/47813
5570 [48056]: https://github.com/rust-lang/rust/pull/48056
5571 [48125]: https://github.com/rust-lang/rust/pull/48125
5572 [48235]: https://github.com/rust-lang/rust/pull/48235
5573 [48274]: https://github.com/rust-lang/rust/pull/48274
5574 [48281]: https://github.com/rust-lang/rust/pull/48281
5575 [48296]: https://github.com/rust-lang/rust/pull/48296
5576 [48326]: https://github.com/rust-lang/rust/pull/48326
5577 [48359]: https://github.com/rust-lang/rust/pull/48359
5578 [48404]: https://github.com/rust-lang/rust/pull/48404
5579 [48481]: https://github.com/rust-lang/rust/pull/48481
5580 [48516]: https://github.com/rust-lang/rust/pull/48516
5581 [48628]: https://github.com/rust-lang/rust/pull/48628
5582 [48629]: https://github.com/rust-lang/rust/pull/48629
5583 [48657]: https://github.com/rust-lang/rust/pull/48657
5584 [48735]: https://github.com/rust-lang/rust/pull/48735
5585 [48978]: https://github.com/rust-lang/rust/pull/48978
5586 [49101]: https://github.com/rust-lang/rust/pull/49101
5587 [49109]: https://github.com/rust-lang/rust/pull/49109
5588 [49162]: https://github.com/rust-lang/rust/pull/49162
5589 [49255]: https://github.com/rust-lang/rust/pull/49255
5590 [49299]: https://github.com/rust-lang/rust/pull/49299
5591 [49305]: https://github.com/rust-lang/rust/pull/49305
5592 [49394]: https://github.com/rust-lang/rust/pull/49394
5593 [49458]: https://github.com/rust-lang/rust/pull/49458
5594 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5595 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5596 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5597 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5598 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5599 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5600 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5601 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5602 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5603 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5604 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5605 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5606 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5607 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5608 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5609 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5610 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5611 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5612 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5613 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5614 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5615 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5616 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5617 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5618 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5619 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5620 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5621 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5622 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5623 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5624 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5625 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5626 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5627 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5628 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5629 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5630 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5631 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5632 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5633 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5634 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5635 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5638 Version 1.25.0 (2018-03-29)
5639 ==========================
5643 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5644 - [You can now use nested groups of imports.][47948]
5645 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5646 - [You can now have `|` at the start of a match arm.][47947] e.g.
5648 enum Foo { A, B, C }
5654 | Foo::B => println!("AB"),
5655 | Foo::C => println!("C"),
5662 - [Upgraded to LLVM 6.][47828]
5663 - [Added `-C lto=val` option.][47521]
5664 - [Added `i586-unknown-linux-musl` target][47282]
5668 - [Impl Send for `process::Command` on Unix.][47760]
5669 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5670 - [`UnsafeCell::into_inner` is now safe.][47204]
5671 - [Implement libstd for CloudABI.][47268]
5672 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5673 - [Implement `AsRef<Path>` for Component][46985]
5674 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5675 - [Moved `Duration` to libcore.][46666]
5679 - [`Location::column`]
5682 The following functions can now be used in a constant expression.
5683 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5684 - [`Duration::new`][47300]
5685 - [`Duration::from_secs`][47300]
5686 - [`Duration::from_millis`][47300]
5690 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5691 - [`cargo new` now defaults to creating a binary crate, instead of a
5692 library crate.][cargo/5029]
5696 - [Rust by example is now shipped with new releases][46196]
5700 - [Deprecated `net::lookup_host`.][47510]
5701 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5702 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5703 around indexing operations (see [#47349][47349]). This has been fixed (which also
5704 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5705 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5707 [33903]: https://github.com/rust-lang/rust/pull/33903
5708 [47947]: https://github.com/rust-lang/rust/pull/47947
5709 [47948]: https://github.com/rust-lang/rust/pull/47948
5710 [47760]: https://github.com/rust-lang/rust/pull/47760
5711 [47790]: https://github.com/rust-lang/rust/pull/47790
5712 [47828]: https://github.com/rust-lang/rust/pull/47828
5713 [47398]: https://github.com/rust-lang/rust/pull/47398
5714 [47510]: https://github.com/rust-lang/rust/pull/47510
5715 [47521]: https://github.com/rust-lang/rust/pull/47521
5716 [47204]: https://github.com/rust-lang/rust/pull/47204
5717 [47251]: https://github.com/rust-lang/rust/pull/47251
5718 [47268]: https://github.com/rust-lang/rust/pull/47268
5719 [47282]: https://github.com/rust-lang/rust/pull/47282
5720 [47300]: https://github.com/rust-lang/rust/pull/47300
5721 [47349]: https://github.com/rust-lang/rust/pull/47349
5722 [46931]: https://github.com/rust-lang/rust/pull/46931
5723 [46985]: https://github.com/rust-lang/rust/pull/46985
5724 [47006]: https://github.com/rust-lang/rust/pull/47006
5725 [46830]: https://github.com/rust-lang/rust/pull/46830
5726 [46095]: https://github.com/rust-lang/rust/pull/46095
5727 [46666]: https://github.com/rust-lang/rust/pull/46666
5728 [46196]: https://github.com/rust-lang/rust/pull/46196
5729 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5730 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5731 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5732 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5733 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5736 Version 1.24.1 (2018-03-01)
5737 ==========================
5739 - [Do not abort when unwinding through FFI][48251]
5740 - [Emit UTF-16 files for linker arguments on Windows][48318]
5741 - [Make the error index generator work again][48308]
5742 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5744 [48251]: https://github.com/rust-lang/rust/issues/48251
5745 [48308]: https://github.com/rust-lang/rust/issues/48308
5746 [48318]: https://github.com/rust-lang/rust/issues/48318
5747 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5750 Version 1.24.0 (2018-02-15)
5751 ==========================
5755 - [External `sysv64` ffi is now available.][46528]
5756 eg. `extern "sysv64" fn foo () {}`
5760 - [rustc now uses 16 codegen units by default for release builds.][46910]
5761 For the fastest builds, utilize `codegen-units=1`.
5762 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5763 - [Add `aarch64-unknown-openbsd` support][46760]
5767 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5768 improvement in performance in the majority of cases.
5769 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5770 with Windows.][46798]
5771 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5772 - [impl `From<bool>` for `AtomicBool`][46293]
5773 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5774 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5775 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5776 - [float::from_bits now just uses transmute.][46012] This provides
5777 some optimisations from LLVM.
5778 - [Copied `AsciiExt` methods onto `char`][46077]
5779 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5780 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5781 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5782 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5786 - [`RefCell::replace`]
5788 - [`atomic::spin_loop_hint`]
5790 The following functions can now be used in a constant expression.
5791 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5793 - [`AtomicBool::new`][46287]
5794 - [`AtomicUsize::new`][46287]
5795 - [`AtomicIsize::new`][46287]
5796 - [`AtomicPtr::new`][46287]
5797 - [`Cell::new`][46287]
5798 - [`{integer}::min_value`][46287]
5799 - [`{integer}::max_value`][46287]
5800 - [`mem::size_of`][46287]
5801 - [`mem::align_of`][46287]
5802 - [`ptr::null`][46287]
5803 - [`ptr::null_mut`][46287]
5804 - [`RefCell::new`][46287]
5805 - [`UnsafeCell::new`][46287]
5809 - [Added a `workspace.default-members` config that
5810 overrides implied `--all` in virtual workspaces.][cargo/4743]
5811 - [Enable incremental by default on development builds.][cargo/4817] Also added
5812 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5813 per-project or global basis respectively.
5820 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5821 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5822 in accordance with IETF RFC 4291 §2.2.
5823 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5824 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5825 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5826 - [Leading zeros in tuple struct members is now an error][47084]
5827 - [`column!()` macro is one-based instead of zero-based][46977]
5828 - [`fmt::Arguments` can no longer be shared across threads][45198]
5829 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5830 - [Cargo sets a different working directory for the compiler][cargo/4788]
5832 [44884]: https://github.com/rust-lang/rust/pull/44884
5833 [45198]: https://github.com/rust-lang/rust/pull/45198
5834 [45506]: https://github.com/rust-lang/rust/pull/45506
5835 [45990]: https://github.com/rust-lang/rust/pull/45990
5836 [46012]: https://github.com/rust-lang/rust/pull/46012
5837 [46077]: https://github.com/rust-lang/rust/pull/46077
5838 [46094]: https://github.com/rust-lang/rust/pull/46094
5839 [46284]: https://github.com/rust-lang/rust/pull/46284
5840 [46287]: https://github.com/rust-lang/rust/pull/46287
5841 [46293]: https://github.com/rust-lang/rust/pull/46293
5842 [46528]: https://github.com/rust-lang/rust/pull/46528
5843 [46671]: https://github.com/rust-lang/rust/pull/46671
5844 [46713]: https://github.com/rust-lang/rust/pull/46713
5845 [46735]: https://github.com/rust-lang/rust/pull/46735
5846 [46760]: https://github.com/rust-lang/rust/pull/46760
5847 [46798]: https://github.com/rust-lang/rust/pull/46798
5848 [46828]: https://github.com/rust-lang/rust/pull/46828
5849 [46831]: https://github.com/rust-lang/rust/pull/46831
5850 [46833]: https://github.com/rust-lang/rust/pull/46833
5851 [46910]: https://github.com/rust-lang/rust/pull/46910
5852 [46977]: https://github.com/rust-lang/rust/pull/46977
5853 [47018]: https://github.com/rust-lang/rust/pull/47018
5854 [47080]: https://github.com/rust-lang/rust/pull/47080
5855 [47084]: https://github.com/rust-lang/rust/pull/47084
5856 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5857 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5858 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5859 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5860 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5861 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5864 Version 1.23.0 (2018-01-04)
5865 ==========================
5869 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5870 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5871 Which should fix some confusing errors in some operations.
5875 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5876 undefined behavior.][45920]
5877 - [rustc now suggests renaming import if names clash.][45660]
5878 - [Display errors/warnings correctly when there are zero-width or
5879 wide characters.][45711]
5880 - [rustc now avoids unnecessary copies of arguments that are
5881 simple bindings][45380] This should improve memory usage on average by 5-10%.
5882 - [Updated musl used to build musl rustc to 1.1.17][45393]
5886 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5887 - [Implement Hash for raw pointers to unsized types][45483]
5888 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5889 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5890 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5891 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5892 and `<*mut T>::as_mut`][44932]
5893 - [Optimized `Thread::{park, unpark}` implementation][45524]
5894 - [Improved `SliceExt::binary_search` performance.][45333]
5895 - [impl `FromIterator<()>` for `()`][45379]
5896 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5904 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5905 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5906 - [Added unit test checking to `cargo check`][cargo/4592]
5907 - [Cargo now lets you install a specific version
5908 using `cargo install --version`][cargo/4637]
5912 - [Releases now ship with the Cargo book documentation.][45692]
5913 - [rustdoc now prints rendering warnings on every run.][45324]
5917 - [Changes have been made to type equality to make it more correct,
5918 in rare cases this could break some code.][45853] [Tracking issue for
5919 further information][45852]
5920 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5921 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5922 Android 9, the minimum supported version is Android 14.
5923 - [Bumped the minimum LLVM to 3.9][45326]
5925 [44042]: https://github.com/rust-lang/rust/pull/44042
5926 [44932]: https://github.com/rust-lang/rust/pull/44932
5927 [45267]: https://github.com/rust-lang/rust/pull/45267
5928 [45324]: https://github.com/rust-lang/rust/pull/45324
5929 [45326]: https://github.com/rust-lang/rust/pull/45326
5930 [45333]: https://github.com/rust-lang/rust/pull/45333
5931 [45379]: https://github.com/rust-lang/rust/pull/45379
5932 [45380]: https://github.com/rust-lang/rust/pull/45380
5933 [45393]: https://github.com/rust-lang/rust/pull/45393
5934 [45435]: https://github.com/rust-lang/rust/pull/45435
5935 [45483]: https://github.com/rust-lang/rust/pull/45483
5936 [45524]: https://github.com/rust-lang/rust/pull/45524
5937 [45571]: https://github.com/rust-lang/rust/pull/45571
5938 [45580]: https://github.com/rust-lang/rust/pull/45580
5939 [45610]: https://github.com/rust-lang/rust/pull/45610
5940 [45660]: https://github.com/rust-lang/rust/pull/45660
5941 [45692]: https://github.com/rust-lang/rust/pull/45692
5942 [45711]: https://github.com/rust-lang/rust/pull/45711
5943 [45772]: https://github.com/rust-lang/rust/pull/45772
5944 [45852]: https://github.com/rust-lang/rust/issues/45852
5945 [45853]: https://github.com/rust-lang/rust/pull/45853
5946 [45887]: https://github.com/rust-lang/rust/pull/45887
5947 [45920]: https://github.com/rust-lang/rust/pull/45920
5948 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5949 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5950 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5953 Version 1.22.1 (2017-11-22)
5954 ==========================
5956 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5958 [46183]: https://github.com/rust-lang/rust/pull/46183
5960 Version 1.22.0 (2017-11-22)
5961 ==========================
5965 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5966 - [Now accepts underscores in unicode escapes][43716]
5967 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5968 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5972 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5973 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5974 This should decrease compile times for debug builds.
5975 - [strict memory alignment now enabled on ARMv6][45094]
5976 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5980 - [Allow atomic operations up to 32 bits
5981 on `armv5te_unknown_linux_gnueabi`][44978]
5982 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5983 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5984 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5985 - [Properly detect overflow in `Instant += Duration`.][44220]
5986 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5987 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5988 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5995 - [Cargo will now build multi file examples in subdirectories of the `examples`
5996 folder that have a `main.rs` file.][cargo/4496]
5997 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5998 the old format will continue to work and can be updated with `cargo update`.
5999 - [Now supports vendoring git repositories][cargo/3992]
6003 - [`libbacktrace` is now available on Apple platforms.][44251]
6004 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6005 This now lets you specify that a given code example will fail to compile.
6009 - [The minimum Android version that rustc can build for has been bumped
6010 to `4.0` from `2.3`][45656]
6011 - [Allowing `T op= &T` for numeric types has broken some type
6012 inference cases][45480]
6015 [42526]: https://github.com/rust-lang/rust/pull/42526
6016 [43716]: https://github.com/rust-lang/rust/pull/43716
6017 [43949]: https://github.com/rust-lang/rust/pull/43949
6018 [44015]: https://github.com/rust-lang/rust/pull/44015
6019 [44220]: https://github.com/rust-lang/rust/pull/44220
6020 [44251]: https://github.com/rust-lang/rust/pull/44251
6021 [44287]: https://github.com/rust-lang/rust/pull/44287
6022 [44303]: https://github.com/rust-lang/rust/pull/44303
6023 [44456]: https://github.com/rust-lang/rust/pull/44456
6024 [44466]: https://github.com/rust-lang/rust/pull/44466
6025 [44895]: https://github.com/rust-lang/rust/pull/44895
6026 [44966]: https://github.com/rust-lang/rust/pull/44966
6027 [44978]: https://github.com/rust-lang/rust/pull/44978
6028 [45041]: https://github.com/rust-lang/rust/pull/45041
6029 [45064]: https://github.com/rust-lang/rust/pull/45064
6030 [45075]: https://github.com/rust-lang/rust/pull/45075
6031 [45094]: https://github.com/rust-lang/rust/pull/45094
6032 [45095]: https://github.com/rust-lang/rust/pull/45095
6033 [45480]: https://github.com/rust-lang/rust/issues/45480
6034 [45656]: https://github.com/rust-lang/rust/pull/45656
6035 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6036 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6037 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6044 Version 1.21.0 (2017-10-12)
6045 ==========================
6049 - [You can now use static references for literals.][43838]
6053 let x: &'static u32 = &0;
6056 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6059 my_macro!(Vec<i32>::new); // Always worked
6060 my_macro!(Vec::<i32>::new); // Now works
6065 - [Upgraded jemalloc to 4.5.0][43911]
6066 - [Enabled unwinding panics on Redox][43917]
6067 - [Now runs LLVM in parallel during translation phase.][43506]
6068 This should reduce peak memory usage.
6072 - [Generate builtin impls for `Clone` for all arrays and tuples that
6073 are `T: Clone`][43690]
6074 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6075 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6076 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6081 [`std::mem::discriminant`]
6085 - [You can now call `cargo install` with multiple package names][cargo/4216]
6086 - [Cargo commands inside a virtual workspace will now implicitly
6087 pass `--all`][cargo/4335]
6088 - [Added a `[patch]` section to `Cargo.toml` to handle
6089 prepublication dependencies][cargo/4123] [RFC 1969]
6090 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6091 like patterns][cargo/4270]
6092 - [Added the `--all-targets` option][cargo/4400]
6093 - [Using required dependencies as a feature is now deprecated and emits
6094 a warning][cargo/4364]
6099 - [Cargo docs are moving][43916]
6100 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6101 - [The rustdoc book is now available][43863]
6102 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6103 - [Added a preview of RLS has been made available through rustup][44204]
6104 Install with `rustup component add rls-preview`
6105 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6106 Previously only showed `std::os::unix`.
6110 - [Changes in method matching against higher-ranked types][43880] This may cause
6111 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6112 - [rustc's JSON error output's byte position start at top of file.][42973]
6113 Was previously relative to the rustc's internal `CodeMap` struct which
6114 required the unstable library `libsyntax` to correctly use.
6115 - [`unused_results` lint no longer ignores booleans][43728]
6117 [42565]: https://github.com/rust-lang/rust/pull/42565
6118 [42973]: https://github.com/rust-lang/rust/pull/42973
6119 [43348]: https://github.com/rust-lang/rust/pull/43348
6120 [43459]: https://github.com/rust-lang/rust/pull/43459
6121 [43506]: https://github.com/rust-lang/rust/pull/43506
6122 [43540]: https://github.com/rust-lang/rust/pull/43540
6123 [43690]: https://github.com/rust-lang/rust/pull/43690
6124 [43728]: https://github.com/rust-lang/rust/pull/43728
6125 [43838]: https://github.com/rust-lang/rust/pull/43838
6126 [43863]: https://github.com/rust-lang/rust/pull/43863
6127 [43880]: https://github.com/rust-lang/rust/pull/43880
6128 [43911]: https://github.com/rust-lang/rust/pull/43911
6129 [43916]: https://github.com/rust-lang/rust/pull/43916
6130 [43917]: https://github.com/rust-lang/rust/pull/43917
6131 [44204]: https://github.com/rust-lang/rust/pull/44204
6132 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6133 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6134 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6135 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6136 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6137 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6138 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6139 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6140 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6142 Version 1.20.0 (2017-08-31)
6143 ===========================
6147 - [Associated constants are now stabilised.][42809]
6148 - [A lot of macro bugs are now fixed.][42913]
6153 - [Struct fields are now properly coerced to the expected field type.][42807]
6154 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6155 `wasm32-experimental-emscripten` target.
6156 - [Changed some of the error messages to be more helpful.][42033]
6157 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6159 - [rustc now reports the total number of errors on compilation failure][43015]
6160 previously this was only the number of errors in the pass that failed.
6161 - [Expansion in rustc has been sped up 29x.][42533]
6162 - [added `msp430-none-elf` target.][43099]
6163 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6165 - [Fixes backtraces on Redox][43228]
6166 - [rustc now identifies different versions of same crate when absolute paths of
6167 different types match in an error message.][42826]
6173 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6174 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6176 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6177 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6178 - [Impl `Clone` for `DefaultHasher`.][42799]
6179 - [Impl `Sync` for `SyncSender`.][42397]
6180 - [Impl `FromStr` for `char`][42271]
6181 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6183 - [allow messages in the `unimplemented!()` macro.][42155]
6184 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6185 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6186 - [Upgrade to Unicode 10.0.0][42999]
6187 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6188 - [Skip the main thread's manual stack guard on Linux][43072]
6189 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6190 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6192 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6197 - [`CStr::into_c_string`]
6198 - [`CString::as_c_str`]
6199 - [`CString::into_boxed_c_str`]
6200 - [`Chain::get_mut`]
6201 - [`Chain::get_ref`]
6202 - [`Chain::into_inner`]
6203 - [`Option::get_or_insert_with`]
6204 - [`Option::get_or_insert`]
6205 - [`OsStr::into_os_string`]
6206 - [`OsString::into_boxed_os_str`]
6209 - [`Utf8Error::error_len`]
6210 - [`char::EscapeDebug`]
6211 - [`char::escape_debug`]
6212 - [`compile_error!`]
6213 - [`f32::from_bits`]
6215 - [`f64::from_bits`]
6217 - [`mem::ManuallyDrop`]
6218 - [`slice::sort_unstable_by_key`]
6219 - [`slice::sort_unstable_by`]
6220 - [`slice::sort_unstable`]
6221 - [`str::from_boxed_utf8_unchecked`]
6222 - [`str::as_bytes_mut`]
6223 - [`str::as_bytes_mut`]
6224 - [`str::from_utf8_mut`]
6225 - [`str::from_utf8_unchecked_mut`]
6227 - [`str::get_unchecked_mut`]
6228 - [`str::get_unchecked`]
6230 - [`str::into_boxed_bytes`]
6235 - [Cargo API token location moved from `~/.cargo/config` to
6236 `~/.cargo/credentials`.][cargo/3978]
6237 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6238 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6239 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6240 - [You can now specify version of a binary when installed through
6241 `cargo install` using `--vers`.][cargo/4229]
6242 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6243 failure.][cargo/4248]
6244 - [Changed the convention around which file is the crate root.][cargo/4259]
6249 - [Functions with `'static` in their return types will now not be as usable as
6250 if they were using lifetime parameters instead.][42417]
6251 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6252 takes the sign of NaN into account where previously didn't.][42430]
6254 [42033]: https://github.com/rust-lang/rust/pull/42033
6255 [42155]: https://github.com/rust-lang/rust/pull/42155
6256 [42271]: https://github.com/rust-lang/rust/pull/42271
6257 [42397]: https://github.com/rust-lang/rust/pull/42397
6258 [42417]: https://github.com/rust-lang/rust/pull/42417
6259 [42430]: https://github.com/rust-lang/rust/pull/42430
6260 [42431]: https://github.com/rust-lang/rust/pull/42431
6261 [42533]: https://github.com/rust-lang/rust/pull/42533
6262 [42571]: https://github.com/rust-lang/rust/pull/42571
6263 [42613]: https://github.com/rust-lang/rust/pull/42613
6264 [42799]: https://github.com/rust-lang/rust/pull/42799
6265 [42807]: https://github.com/rust-lang/rust/pull/42807
6266 [42809]: https://github.com/rust-lang/rust/pull/42809
6267 [42822]: https://github.com/rust-lang/rust/pull/42822
6268 [42826]: https://github.com/rust-lang/rust/pull/42826
6269 [42854]: https://github.com/rust-lang/rust/pull/42854
6270 [42913]: https://github.com/rust-lang/rust/pull/42913
6271 [42999]: https://github.com/rust-lang/rust/pull/42999
6272 [43011]: https://github.com/rust-lang/rust/pull/43011
6273 [43015]: https://github.com/rust-lang/rust/pull/43015
6274 [43072]: https://github.com/rust-lang/rust/pull/43072
6275 [43077]: https://github.com/rust-lang/rust/pull/43077
6276 [43097]: https://github.com/rust-lang/rust/pull/43097
6277 [43099]: https://github.com/rust-lang/rust/pull/43099
6278 [43170]: https://github.com/rust-lang/rust/pull/43170
6279 [43178]: https://github.com/rust-lang/rust/pull/43178
6280 [43185]: https://github.com/rust-lang/rust/pull/43185
6281 [43228]: https://github.com/rust-lang/rust/pull/43228
6282 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6283 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6284 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6285 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6286 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6287 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6288 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6289 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6290 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6291 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6292 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6293 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6294 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6295 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6296 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6297 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6298 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6299 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6300 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6301 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6302 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6303 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6304 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6305 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6306 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6307 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6308 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6309 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6310 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6311 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6312 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6313 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6314 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6315 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6316 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6317 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6318 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6319 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6322 Version 1.19.0 (2017-07-20)
6323 ===========================
6328 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6329 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6330 - [Macro recursion limit increased to 1024 from 64.][41676]
6331 - [Added lint for detecting unused macros.][41907]
6332 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6333 For example: `let x = loop { break 7; };`
6334 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6335 contain `Copy` types and cannot have a `Drop` implementation.
6336 Example: `union Foo { bar: u8, baz: usize }`
6337 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6338 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6343 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6344 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6345 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6346 you should use `--target armv7-linux-androideabi`.
6347 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6348 - [Minor optimisation of string operations.][42037]
6349 - [Compiler error message is now `aborting due to previous error(s)` instead of
6350 `aborting due to N previous errors`][42150] This was previously inaccurate and
6351 would only count certain kinds of errors.
6352 - [The compiler now supports Visual Studio 2017][42225]
6353 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6354 - [Added a lot][42264] of [new error codes][42302]
6355 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6356 libraries with C Run-time Libraries(CRT) to be statically linked.
6357 - [Fixed various ARM codegen bugs][42740]
6362 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6363 `Extend<Cow<'a, str>>`][41449]
6364 - [`Vec` now implements `From<&mut [T]>`][41530]
6365 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6366 - [`SplitWhitespace` now implements `Clone`][41659]
6367 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6369 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6370 macros, but for printing to stderr.
6375 - [`OsString::shrink_to_fit`]
6378 - [`thread::ThreadId`]
6383 - [Build scripts can now add environment variables to the environment
6384 the crate is being compiled in.
6385 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6386 - [Subcommands now replace the current process rather than spawning a new
6387 child process][cargo/3970]
6388 - [Workspace members can now accept glob file patterns][cargo/3979]
6389 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6390 the members in a given workspace.][cargo/3988]
6391 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6392 - [Target directory path is now in the cargo metadata][cargo/4022]
6393 - [Cargo no longer checks out a local working directory for the
6394 crates.io index][cargo/4026] This should provide smaller file size for the
6395 registry, and improve cloning times, especially on Windows machines.
6396 - [Added an `--exclude` option for excluding certain packages when using the
6397 `--all` option][cargo/4031]
6398 - [Cargo will now automatically retry when receiving a 5xx error
6399 from crates.io][cargo/4032]
6400 - [The `--features` option now accepts multiple comma or space
6401 delimited values.][cargo/4084]
6402 - [Added support for custom target specific runners][cargo/3954]
6407 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6409 - [Rust will now release XZ compressed packages][rust-installer/57]
6410 - [rustup will now prefer to download rust packages with
6411 XZ compression][rustup/1100] over GZip packages.
6412 - [Added the ability to escape `#` in rust documentation][41785] By adding
6413 additional `#`'s ie. `##` is now `#`
6418 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6419 - [`-Z` flags are now no longer allowed to be used on the stable
6420 compiler.][41751] This has been a warning for a year previous to this.
6421 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6422 longer works][42844]. Users should migrate to the built-in `check`
6423 command, which has been available since 1.16.
6424 - [Ending a float literal with `._` is now a hard error.
6425 Example: `42._` .][41946]
6426 - [Any use of a private `extern crate` outside of its module is now a
6427 hard error.][36886] This was previously a warning.
6428 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6429 relative while the `::` prefix makes a path absolute, but was ignored and the
6430 path was relative regardless.
6431 - [Floating point constants in match patterns is now a hard error][36890]
6432 This was previously a warning.
6433 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6434 match patterns is now a hard error][36891] This was previously a warning.
6435 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6437 - [From the pound escape, lines consisting of multiple `#`s are
6439 - [It is an error to re-export private enum variants][42460]. This is
6440 known to break a number of crates that depend on an older version of
6442 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6443 to use it to find the linker, and the build will fail where it did
6444 not previously][42607]
6446 [36886]: https://github.com/rust-lang/rust/issues/36886
6447 [36888]: https://github.com/rust-lang/rust/issues/36888
6448 [36890]: https://github.com/rust-lang/rust/issues/36890
6449 [36891]: https://github.com/rust-lang/rust/issues/36891
6450 [36892]: https://github.com/rust-lang/rust/issues/36892
6451 [37406]: https://github.com/rust-lang/rust/issues/37406
6452 [39983]: https://github.com/rust-lang/rust/pull/39983
6453 [41145]: https://github.com/rust-lang/rust/pull/41145
6454 [41192]: https://github.com/rust-lang/rust/pull/41192
6455 [41258]: https://github.com/rust-lang/rust/pull/41258
6456 [41370]: https://github.com/rust-lang/rust/pull/41370
6457 [41449]: https://github.com/rust-lang/rust/pull/41449
6458 [41530]: https://github.com/rust-lang/rust/pull/41530
6459 [41624]: https://github.com/rust-lang/rust/pull/41624
6460 [41656]: https://github.com/rust-lang/rust/pull/41656
6461 [41659]: https://github.com/rust-lang/rust/pull/41659
6462 [41676]: https://github.com/rust-lang/rust/pull/41676
6463 [41751]: https://github.com/rust-lang/rust/pull/41751
6464 [41764]: https://github.com/rust-lang/rust/pull/41764
6465 [41785]: https://github.com/rust-lang/rust/pull/41785
6466 [41873]: https://github.com/rust-lang/rust/pull/41873
6467 [41907]: https://github.com/rust-lang/rust/pull/41907
6468 [41946]: https://github.com/rust-lang/rust/pull/41946
6469 [42016]: https://github.com/rust-lang/rust/pull/42016
6470 [42037]: https://github.com/rust-lang/rust/pull/42037
6471 [42068]: https://github.com/rust-lang/rust/pull/42068
6472 [42150]: https://github.com/rust-lang/rust/pull/42150
6473 [42162]: https://github.com/rust-lang/rust/pull/42162
6474 [42225]: https://github.com/rust-lang/rust/pull/42225
6475 [42264]: https://github.com/rust-lang/rust/pull/42264
6476 [42302]: https://github.com/rust-lang/rust/pull/42302
6477 [42460]: https://github.com/rust-lang/rust/issues/42460
6478 [42607]: https://github.com/rust-lang/rust/issues/42607
6479 [42740]: https://github.com/rust-lang/rust/pull/42740
6480 [42844]: https://github.com/rust-lang/rust/issues/42844
6481 [42948]: https://github.com/rust-lang/rust/pull/42948
6482 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6483 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6484 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6485 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6486 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6487 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6488 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6489 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6490 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6491 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6492 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6493 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6494 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6495 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6496 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6497 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6498 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6499 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6500 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6501 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6502 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6503 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6506 Version 1.18.0 (2017-06-08)
6507 ===========================
6512 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6513 make the item visible to just that module tree. Also accepts the keyword
6514 `crate` to make something public to the whole crate but not users of the
6515 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6516 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6517 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6518 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6519 types like `Write + Send`, trailing `+` are now supported in trait objects,
6520 and better error reporting for trait objects starting with `?Sized`.
6521 - [0e+10 is now a valid floating point literal][40589]
6522 - [Now warns if you bind a lifetime parameter to 'static][40734]
6523 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6524 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6525 representation in some cases.][40377]
6530 - [rustc can now emit mir with `--emit mir`][39891]
6531 - [Improved LLVM IR for trivial functions][40367]
6532 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6533 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6534 opportunities found through profiling
6535 - [Improved backtrace formatting when panicking][38165]
6540 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6541 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6542 iteration or reallocation.
6543 - [Simplified HashMap Bucket interface][40561] provides performance
6544 improvements for iterating and cloning.
6545 - [Specialize Vec::from_elem to use calloc][40409]
6546 - [Fixed Race condition in fs::create_dir_all][39799]
6547 - [No longer caching stdio on Windows][40516]
6548 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6549 2.50%~ faster and in one case now 12.50% faster.
6550 - [Optimized `AtomicBool::fetch_nand`][41143]
6555 - [`Child::try_wait`]
6556 - [`HashMap::retain`]
6557 - [`HashSet::retain`]
6559 - [`TcpStream::peek`]
6560 - [`UdpSocket::peek`]
6561 - [`UdpSocket::peek_from`]
6566 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6567 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6568 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6569 - [Added Android build support][cargo/3885]
6570 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6571 of a certain type, for example `cargo build --bins` will build all
6573 - [Added support for haiku][cargo/3952]
6578 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6579 - [Rust now uses the official cross compiler for NetBSD][40612]
6580 - [rustdoc now accepts `#` at the start of files][40828]
6581 - [Fixed jemalloc support for musl][41168]
6586 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6587 always placed after the sign if it exists and before the digits. With the `#`
6588 flag the zeroes are placed after the prefix and before the digits.
6589 - [Due to the struct field optimisation][40377], using `transmute` on structs
6590 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6591 always been undefined behavior, but is now more likely to break in practice.
6592 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6593 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6594 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6595 - [Overlapping inherent `impl`s are now a hard error][40728]
6596 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6597 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6598 `out.asm` and `out.ll` instead of only one of the filetypes.
6599 - [ calling a function that returns `Self` will no longer work][41805] when
6600 the size of `Self` cannot be statically determined.
6601 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6602 this has caused a few regressions namely:
6604 - Changed the link order of local static/dynamic libraries (respecting the
6605 order on given rather than having the compiler reorder).
6606 - Changed how MinGW is linked, native code linked to dynamic libraries
6607 may require manually linking to the gcc support library (for the native
6610 [38165]: https://github.com/rust-lang/rust/pull/38165
6611 [39799]: https://github.com/rust-lang/rust/pull/39799
6612 [39891]: https://github.com/rust-lang/rust/pull/39891
6613 [40043]: https://github.com/rust-lang/rust/pull/40043
6614 [40241]: https://github.com/rust-lang/rust/pull/40241
6615 [40338]: https://github.com/rust-lang/rust/pull/40338
6616 [40367]: https://github.com/rust-lang/rust/pull/40367
6617 [40377]: https://github.com/rust-lang/rust/pull/40377
6618 [40409]: https://github.com/rust-lang/rust/pull/40409
6619 [40516]: https://github.com/rust-lang/rust/pull/40516
6620 [40556]: https://github.com/rust-lang/rust/pull/40556
6621 [40561]: https://github.com/rust-lang/rust/pull/40561
6622 [40589]: https://github.com/rust-lang/rust/pull/40589
6623 [40612]: https://github.com/rust-lang/rust/pull/40612
6624 [40723]: https://github.com/rust-lang/rust/pull/40723
6625 [40728]: https://github.com/rust-lang/rust/pull/40728
6626 [40731]: https://github.com/rust-lang/rust/pull/40731
6627 [40734]: https://github.com/rust-lang/rust/pull/40734
6628 [40805]: https://github.com/rust-lang/rust/pull/40805
6629 [40807]: https://github.com/rust-lang/rust/pull/40807
6630 [40828]: https://github.com/rust-lang/rust/pull/40828
6631 [40870]: https://github.com/rust-lang/rust/pull/40870
6632 [41085]: https://github.com/rust-lang/rust/pull/41085
6633 [41143]: https://github.com/rust-lang/rust/pull/41143
6634 [41168]: https://github.com/rust-lang/rust/pull/41168
6635 [41270]: https://github.com/rust-lang/rust/issues/41270
6636 [41469]: https://github.com/rust-lang/rust/pull/41469
6637 [41805]: https://github.com/rust-lang/rust/issues/41805
6638 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6639 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6640 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6641 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6642 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6643 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6644 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6645 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6646 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6647 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6648 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6649 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6650 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6651 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6654 Version 1.17.0 (2017-04-27)
6655 ===========================
6660 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6661 * [Fields of structs may be initialized without duplicating the field/variable
6662 names][39761]. [RFC 1682]
6663 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6664 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6665 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6666 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6667 `'b`. Soundness fix.
6668 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6669 * [Static variables may contain references to other statics][40027]
6674 * [Exit quickly on only `--emit dep-info`][40336]
6675 * [Make `-C relocation-model` more correctly determine whether the linker
6676 creates a position-independent executable][40245]
6677 * [Add `-C overflow-checks` to directly control whether integer overflow
6679 * [The rustc type checker now checks items on demand instead of in a single
6680 in-order pass][40008]. This is mostly an internal refactoring in support of
6681 future work, including incremental type checking, but also resolves [RFC
6682 1647], allowing `Self` to appear in `impl` `where` clauses.
6683 * [Optimize vtable loads][39995]
6684 * [Turn off vectorization for Emscripten targets][39990]
6685 * [Provide suggestions for unknown macros imported with `use`][39953]
6686 * [Fix ICEs in path resolution][39939]
6687 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6688 * [Add clearer error message using `&str + &str`][39116]
6699 * [`Ordering::then`]
6700 * [`Ordering::then_with`]
6701 * [`BTreeMap::range`]
6702 * [`BTreeMap::range_mut`]
6703 * [`collections::Bound`]
6704 * [`process::abort`]
6705 * [`ptr::read_unaligned`]
6706 * [`ptr::write_unaligned`]
6707 * [`Result::expect_err`]
6710 * [`Cell::into_inner`]
6716 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6717 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6718 * [`String` implements `FromIterator<&char>`][40028]
6719 * `Box` [implements][40009] a number of new conversions:
6720 `From<Box<str>> for String`,
6721 `From<Box<[T]>> for Vec<T>`,
6722 `From<Box<CStr>> for CString`,
6723 `From<Box<OsStr>> for OsString`,
6724 `From<Box<Path>> for PathBuf`,
6725 `Into<Box<str>> for String`,
6726 `Into<Box<[T]>> for Vec<T>`,
6727 `Into<Box<CStr>> for CString`,
6728 `Into<Box<OsStr>> for OsString`,
6729 `Into<Box<Path>> for PathBuf`,
6730 `Default for Box<str>`,
6731 `Default for Box<CStr>`,
6732 `Default for Box<OsStr>`,
6733 `From<&CStr> for Box<CStr>`,
6734 `From<&OsStr> for Box<OsStr>`,
6735 `From<&Path> for Box<Path>`
6736 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6737 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6738 * [Slightly optimize `slice::sort`][39538]
6739 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6740 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6741 `Box<str>` implements `From<&str>`][39438]
6742 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6743 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6744 * [`format!` estimates the needed capacity before writing a string][39356]
6745 * [Support unprivileged symlink creation in Windows][38921]
6746 * [`PathBuf` implements `Default`][38764]
6747 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6748 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6749 and poor hash functions.
6754 * [Add `cargo check --all`][cargo/3731]
6755 * [Add an option to ignore SSL revocation checking][cargo/3699]
6756 * [Add `cargo run --package`][cargo/3691]
6757 * [Add `required_features`][cargo/3667]
6758 * [Assume `build.rs` is a build script][cargo/3664]
6759 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6764 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6766 * [The "Unstable Book" documents nightly-only features][ubook]
6767 * [Improve the style of the sidebar in rustdoc output][40265]
6768 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6769 * [Fix MSP430 breakage due to `i128`][40257]
6770 * [Preliminary Solaris/SPARCv9 support][39903]
6771 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6772 run without installing the MSVC runtime.
6773 * [`rustdoc --test` includes file names in test names][39788]
6774 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6775 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6776 * [Initial support for `aarch64-unknown-freebsd`][39491]
6777 * [Initial support for `i686-unknown-netbsd`][39426]
6778 * [This release no longer includes the old makefile build system][39431]. Rust
6779 is built with a custom build system, written in Rust, and with Cargo.
6780 * [Add Debug implementations for libcollection structs][39002]
6781 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6782 * [`--test-threads=0` produces an error][38945]
6783 * [`rustup` installs documentation by default][40526]
6784 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6785 WinDbg and Visual Studio to improve the debugging experience.
6790 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6791 workaround, either use MSVC 2015 or run vcvars.bat.
6792 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6793 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6794 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6796 * [`format!` and `Display::to_string` panic if an underlying formatting
6797 implementation returns an error][40117]. Previously the error was silently
6798 ignored. It is incorrect for `write_fmt` to return an error when writing
6800 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6801 crates were marked stable and could be accessed from the stable toolchain.
6802 * [Rust git source no longer includes vendored crates][39728]. Those that need
6803 to build with vendored crates should build from release tarballs.
6804 * [Fix inert attributes from `proc_macro_derives`][39572]
6805 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6806 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6808 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6809 existing code generally ignores the type of dead-code unless a type-hint is
6810 provided; this can cause surprising inference interactions particularly around
6811 defaulting. The new code uniformly ignores the result type of dead-code.
6812 * [Tuple-struct constructors with private fields are no longer visible][38932]
6813 * [Lifetime parameters that do not appear in the arguments are now considered
6814 early-bound][38897], resolving a soundness bug (#[32330]). The
6815 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6817 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6818 * [Make transmuting from fn item types to pointer-sized types a hard
6821 [27787]: https://github.com/rust-lang/rust/issues/27787
6822 [32330]: https://github.com/rust-lang/rust/issues/32330
6823 [34198]: https://github.com/rust-lang/rust/pull/34198
6824 [38161]: https://github.com/rust-lang/rust/pull/38161
6825 [38368]: https://github.com/rust-lang/rust/pull/38368
6826 [38584]: https://github.com/rust-lang/rust/issues/38584
6827 [38661]: https://github.com/rust-lang/rust/pull/38661
6828 [38764]: https://github.com/rust-lang/rust/pull/38764
6829 [38864]: https://github.com/rust-lang/rust/issues/38864
6830 [38897]: https://github.com/rust-lang/rust/pull/38897
6831 [38921]: https://github.com/rust-lang/rust/pull/38921
6832 [38932]: https://github.com/rust-lang/rust/pull/38932
6833 [38945]: https://github.com/rust-lang/rust/pull/38945
6834 [38981]: https://github.com/rust-lang/rust/pull/38981
6835 [39002]: https://github.com/rust-lang/rust/pull/39002
6836 [39116]: https://github.com/rust-lang/rust/pull/39116
6837 [39193]: https://github.com/rust-lang/rust/pull/39193
6838 [39265]: https://github.com/rust-lang/rust/pull/39265
6839 [39356]: https://github.com/rust-lang/rust/pull/39356
6840 [39372]: https://github.com/rust-lang/rust/pull/39372
6841 [39426]: https://github.com/rust-lang/rust/pull/39426
6842 [39431]: https://github.com/rust-lang/rust/pull/39431
6843 [39438]: https://github.com/rust-lang/rust/pull/39438
6844 [39440]: https://github.com/rust-lang/rust/pull/39440
6845 [39485]: https://github.com/rust-lang/rust/pull/39485
6846 [39491]: https://github.com/rust-lang/rust/pull/39491
6847 [39518]: https://github.com/rust-lang/rust/pull/39518
6848 [39538]: https://github.com/rust-lang/rust/pull/39538
6849 [39572]: https://github.com/rust-lang/rust/pull/39572
6850 [39633]: https://github.com/rust-lang/rust/pull/39633
6851 [39642]: https://github.com/rust-lang/rust/pull/39642
6852 [39728]: https://github.com/rust-lang/rust/pull/39728
6853 [39761]: https://github.com/rust-lang/rust/pull/39761
6854 [39788]: https://github.com/rust-lang/rust/pull/39788
6855 [39793]: https://github.com/rust-lang/rust/pull/39793
6856 [39837]: https://github.com/rust-lang/rust/pull/39837
6857 [39843]: https://github.com/rust-lang/rust/pull/39843
6858 [39851]: https://github.com/rust-lang/rust/pull/39851
6859 [39903]: https://github.com/rust-lang/rust/pull/39903
6860 [39939]: https://github.com/rust-lang/rust/pull/39939
6861 [39953]: https://github.com/rust-lang/rust/pull/39953
6862 [39960]: https://github.com/rust-lang/rust/pull/39960
6863 [39990]: https://github.com/rust-lang/rust/pull/39990
6864 [39995]: https://github.com/rust-lang/rust/pull/39995
6865 [40008]: https://github.com/rust-lang/rust/pull/40008
6866 [40009]: https://github.com/rust-lang/rust/pull/40009
6867 [40027]: https://github.com/rust-lang/rust/pull/40027
6868 [40028]: https://github.com/rust-lang/rust/pull/40028
6869 [40037]: https://github.com/rust-lang/rust/pull/40037
6870 [40117]: https://github.com/rust-lang/rust/pull/40117
6871 [40166]: https://github.com/rust-lang/rust/pull/40166
6872 [40245]: https://github.com/rust-lang/rust/pull/40245
6873 [40257]: https://github.com/rust-lang/rust/pull/40257
6874 [40261]: https://github.com/rust-lang/rust/pull/40261
6875 [40265]: https://github.com/rust-lang/rust/pull/40265
6876 [40319]: https://github.com/rust-lang/rust/pull/40319
6877 [40336]: https://github.com/rust-lang/rust/pull/40336
6878 [40526]: https://github.com/rust-lang/rust/pull/40526
6879 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6880 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6881 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6882 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6883 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6884 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6885 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6886 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6887 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6888 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6889 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6890 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6891 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6892 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6893 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6894 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6895 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6896 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6897 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6898 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6899 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6900 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6901 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6902 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6903 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6904 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6905 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6906 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6907 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6908 [ubook]: https://doc.rust-lang.org/unstable-book/
6911 Version 1.16.0 (2017-03-16)
6912 ===========================
6917 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6918 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6919 match patterns][38069]
6920 * [Clean up semantics of `self` in an import list][38313]
6921 * [`Self` may appear in `impl` headers][38920]
6922 * [`Self` may appear in struct expressions][39282]
6927 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6928 a `.rmeta` file containing only crate metadata][38571]. This can be
6929 used by tools like the Rust Language Service to perform
6930 metadata-only builds.
6931 * [Levenshtein based typo suggestions now work in most places, while
6932 previously they worked only for fields and sometimes for local
6933 variables][38927]. Together with the overhaul of "no
6934 resolution"/"unexpected resolution" errors (#[38154]) they result in
6935 large and systematic improvement in resolution diagnostics.
6936 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6938 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6939 * [`rustc` no longer attempts to provide "consider using an explicit
6940 lifetime" suggestions][37057]. They were inaccurate.
6945 * [`VecDeque::truncate`]
6946 * [`VecDeque::resize`]
6947 * [`String::insert_str`]
6948 * [`Duration::checked_add`]
6949 * [`Duration::checked_sub`]
6950 * [`Duration::checked_div`]
6951 * [`Duration::checked_mul`]
6954 * [`SocketAddr::is_ipv4`]
6955 * [`SocketAddr::is_ipv6`]
6956 * [`IpAddr::is_ipv4`]
6957 * [`IpAddr::is_ipv6`]
6959 * [`Vec::dedup_by_key`]
6960 * [`Result::unwrap_or_default`]
6961 * [`<*const T>::wrapping_offset`]
6962 * [`<*mut T>::wrapping_offset`]
6963 * `CommandExt::creation_flags`
6964 * [`File::set_permissions`]
6965 * [`String::split_off`]
6970 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6971 their argument by `Borrow` parameter][37761]
6972 * [All public types in std implement `Debug`][38006]
6973 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6974 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6975 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6977 * [std: Fix partial writes in `LineWriter`][38062]
6978 * [std: Clamp max read/write sizes on Unix][38622]
6979 * [Use more specific panic message for `&str` slicing errors][38066]
6980 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6981 functionality cannot be achieved in std currently.
6982 * [`writeln!`, like `println!`, now accepts a form with no string
6983 or formatting arguments, to just print a newline][38469]
6984 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6985 * [Reduce the size of static data in `std_unicode::tables`][38781]
6986 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6987 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6989 * [`Duration` implements `Sum`][38712]
6990 * [`String` implements `ToSocketAddrs`][39048]
6995 * [The `cargo check` command does a type check of a project without
6996 building it][cargo/3296]
6997 * [crates.io will display CI badges from Travis and AppVeyor, if
6998 specified in Cargo.toml][cargo/3546]
6999 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
7000 * [Compilation profiles accept integer values for `debug`, in addition
7001 to `true` and `false`. These are passed to `rustc` as the value to
7002 `-C debuginfo`][cargo/3534]
7003 * [Implement `cargo --version --verbose`][cargo/3604]
7004 * [All builds now output 'dep-info' build dependencies compatible with
7005 make and ninja][cargo/3557]
7006 * [Build all workspace members with `build --all`][cargo/3511]
7007 * [Document all workspace members with `doc --all`][cargo/3515]
7008 * [Path deps outside workspace are not members][cargo/3443]
7013 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7014 the path to the Rust implementation][38589]
7015 * [The `armv7-linux-androideabi` target no longer enables NEON
7016 extensions, per Google's ABI guide][38413]
7017 * [The stock standard library can be compiled for Redox OS][38401]
7018 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7020 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7022 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7027 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7028 match patterns][38069]
7029 * In this release, references to uninhabited types can not be
7030 pattern-matched. This was accidentally allowed in 1.15.
7031 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7032 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7034 * [Clean up semantics of `self` in an import list][38313]
7035 * Reimplemented lifetime elision. This change was almost entirely compatible
7036 with existing code, but it did close a number of small bugs and loopholes,
7037 as well as being more accepting in some other [cases][41105].
7039 [37057]: https://github.com/rust-lang/rust/pull/37057
7040 [37761]: https://github.com/rust-lang/rust/pull/37761
7041 [38006]: https://github.com/rust-lang/rust/pull/38006
7042 [38051]: https://github.com/rust-lang/rust/pull/38051
7043 [38062]: https://github.com/rust-lang/rust/pull/38062
7044 [38622]: https://github.com/rust-lang/rust/pull/38622
7045 [38066]: https://github.com/rust-lang/rust/pull/38066
7046 [38069]: https://github.com/rust-lang/rust/pull/38069
7047 [38131]: https://github.com/rust-lang/rust/pull/38131
7048 [38154]: https://github.com/rust-lang/rust/pull/38154
7049 [38274]: https://github.com/rust-lang/rust/pull/38274
7050 [38304]: https://github.com/rust-lang/rust/pull/38304
7051 [38313]: https://github.com/rust-lang/rust/pull/38313
7052 [38327]: https://github.com/rust-lang/rust/pull/38327
7053 [38401]: https://github.com/rust-lang/rust/pull/38401
7054 [38413]: https://github.com/rust-lang/rust/pull/38413
7055 [38469]: https://github.com/rust-lang/rust/pull/38469
7056 [38559]: https://github.com/rust-lang/rust/pull/38559
7057 [38571]: https://github.com/rust-lang/rust/pull/38571
7058 [38580]: https://github.com/rust-lang/rust/pull/38580
7059 [38589]: https://github.com/rust-lang/rust/pull/38589
7060 [38670]: https://github.com/rust-lang/rust/pull/38670
7061 [38712]: https://github.com/rust-lang/rust/pull/38712
7062 [38726]: https://github.com/rust-lang/rust/pull/38726
7063 [38781]: https://github.com/rust-lang/rust/pull/38781
7064 [38798]: https://github.com/rust-lang/rust/pull/38798
7065 [38909]: https://github.com/rust-lang/rust/pull/38909
7066 [38920]: https://github.com/rust-lang/rust/pull/38920
7067 [38927]: https://github.com/rust-lang/rust/pull/38927
7068 [39048]: https://github.com/rust-lang/rust/pull/39048
7069 [39282]: https://github.com/rust-lang/rust/pull/39282
7070 [39379]: https://github.com/rust-lang/rust/pull/39379
7071 [41105]: https://github.com/rust-lang/rust/issues/41105
7072 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7073 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7074 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7075 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7076 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7077 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7078 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7079 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7080 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7081 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7082 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7083 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7084 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7085 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7086 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7087 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7088 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7089 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7090 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7091 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7092 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7093 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7094 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7095 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7096 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7097 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7098 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7099 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7100 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7103 Version 1.15.1 (2017-02-09)
7104 ===========================
7106 * [Fix IntoIter::as_mut_slice's signature][39466]
7107 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7109 [39466]: https://github.com/rust-lang/rust/pull/39466
7110 [39523]: https://github.com/rust-lang/rust/pull/39523
7113 Version 1.15.0 (2017-02-02)
7114 ===========================
7119 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7120 stable. This allows popular code-generating crates like Serde and Diesel to
7121 work ergonomically. [RFC 1681].
7122 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7123 with curly braces][36868]. Part of [RFC 1506].
7124 * [A number of minor changes to name resolution have been activated][37127].
7125 They add up to more consistent semantics, allowing for future evolution of
7126 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7127 details of what is different. The breaking changes here have been transitioned
7128 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7129 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7131 * [`?Sized` can be used in `where` clauses][37791]
7132 * [There is now a limit on the size of monomorphized types and it can be
7133 modified with the `#![type_size_limit]` crate attribute, similarly to
7134 the `#![recursion_limit]` attribute][37789]
7139 * [On Windows, the compiler will apply dllimport attributes when linking to
7140 extern functions][37973]. Additional attributes and flags can control which
7141 library kind is linked and its name. [RFC 1717].
7142 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7143 * [The `--test` flag works with procedural macro crates][38107]
7144 * [Fix `extern "aapcs" fn` ABI][37814]
7145 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7146 * [The `format!` expander recognizes incorrect `printf` and shell-style
7147 formatting directives and suggests the correct format][37613].
7148 * [Only report one error for all unused imports in an import list][37456]
7150 Compiler Performance
7151 --------------------
7153 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7154 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7155 * [Don't clone in `UnificationTable::probe`][37848]
7156 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7157 * [Use small vectors in type walker][37760]
7158 * [Macro expansion performance was improved][37701]
7159 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7160 * [Replace FNV with a faster hash function][37229]
7165 * [`std::iter::Iterator::min_by`]
7166 * [`std::iter::Iterator::max_by`]
7167 * [`std::os::*::fs::FileExt`]
7168 * [`std::sync::atomic::Atomic*::get_mut`]
7169 * [`std::sync::atomic::Atomic*::into_inner`]
7170 * [`std::vec::IntoIter::as_slice`]
7171 * [`std::vec::IntoIter::as_mut_slice`]
7172 * [`std::sync::mpsc::Receiver::try_iter`]
7173 * [`std::os::unix::process::CommandExt::before_exec`]
7174 * [`std::rc::Rc::strong_count`]
7175 * [`std::rc::Rc::weak_count`]
7176 * [`std::sync::Arc::strong_count`]
7177 * [`std::sync::Arc::weak_count`]
7178 * [`std::char::encode_utf8`]
7179 * [`std::char::encode_utf16`]
7180 * [`std::cell::Ref::clone`]
7181 * [`std::io::Take::into_inner`]
7186 * [The standard sorting algorithm has been rewritten for dramatic performance
7187 improvements][38192]. It is a hybrid merge sort, drawing influences from
7188 Timsort. Previously it was a naive merge sort.
7189 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7190 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7192 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7193 and `char_indices().last()`][37882]
7194 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7195 * [Chinese characters display correctly in `fmt::Debug`][37855]
7196 * [Derive `Default` for `Duration`][37699]
7197 * [Support creation of anonymous pipes on WinXP/2k][37677]
7198 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7199 * [Don't pass overlapped handles to processes][38835]
7204 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7205 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7206 should instead check the variable at runtime with `std::env`. That the value
7207 was set at build time was a bug, and incorrect when cross-compiling. This
7208 change is known to cause breakage.
7209 * [Add `--all` flag to `cargo test`][cargo/3221]
7210 * [Compile statically against the MSVC CRT][cargo/3363]
7211 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7212 * [Link OpenSSL statically on OSX][cargo/3311]
7213 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7214 * [Test for bad path overrides with summaries][cargo/3336]
7215 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7216 * [Fix retrying crate downloads for network errors][cargo/3348]
7217 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7218 * [Emit more info on --message-format=json][cargo/3319]
7219 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7220 * [Don't ignore errors in workspace manifest][cargo/3409]
7221 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7226 * [Test runners (binaries built with `--test`) now support a `--list` argument
7227 that lists the tests it contains][38185]
7228 * [Test runners now support a `--exact` argument that makes the test filter
7229 match exactly, instead of matching only a substring of the test name][38181]
7230 * [rustdoc supports a `--playground-url` flag][37763]
7231 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7236 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7237 continue to be used in this release by passing `--disable-rustbuild` to the
7238 configure script, but they will be deleted soon. Note that the new build
7239 system uses a different on-disk layout that will likely affect any scripts
7241 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7243 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7244 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7250 * [A number of minor changes to name resolution have been activated][37127].
7251 They add up to more consistent semantics, allowing for future evolution of
7252 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7253 details of what is different. The breaking changes here have been transitioned
7254 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7255 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7256 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7257 should instead check the variable at runtime with `std::env`. That the value
7258 was set at build time was a bug, and incorrect when cross-compiling. This
7259 change is known to cause breakage.
7260 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7261 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7262 1.10 and is now an error by default. It will become a hard error in the near
7264 * [The semantics relating modules to file system directories are changing in
7265 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7266 lint, which is a warning in this release, and will become a hard error in the
7268 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7269 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7270 the underlying iterator][37834]
7272 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7273 [33685]: https://github.com/rust-lang/rust/issues/33685
7274 [36868]: https://github.com/rust-lang/rust/pull/36868
7275 [37127]: https://github.com/rust-lang/rust/pull/37127
7276 [37229]: https://github.com/rust-lang/rust/pull/37229
7277 [37456]: https://github.com/rust-lang/rust/pull/37456
7278 [37527]: https://github.com/rust-lang/rust/pull/37527
7279 [37602]: https://github.com/rust-lang/rust/pull/37602
7280 [37613]: https://github.com/rust-lang/rust/pull/37613
7281 [37615]: https://github.com/rust-lang/rust/pull/37615
7282 [37636]: https://github.com/rust-lang/rust/pull/37636
7283 [37627]: https://github.com/rust-lang/rust/pull/37627
7284 [37642]: https://github.com/rust-lang/rust/pull/37642
7285 [37677]: https://github.com/rust-lang/rust/pull/37677
7286 [37699]: https://github.com/rust-lang/rust/pull/37699
7287 [37701]: https://github.com/rust-lang/rust/pull/37701
7288 [37705]: https://github.com/rust-lang/rust/pull/37705
7289 [37749]: https://github.com/rust-lang/rust/pull/37749
7290 [37760]: https://github.com/rust-lang/rust/pull/37760
7291 [37763]: https://github.com/rust-lang/rust/pull/37763
7292 [37764]: https://github.com/rust-lang/rust/pull/37764
7293 [37789]: https://github.com/rust-lang/rust/pull/37789
7294 [37791]: https://github.com/rust-lang/rust/pull/37791
7295 [37814]: https://github.com/rust-lang/rust/pull/37814
7296 [37817]: https://github.com/rust-lang/rust/pull/37817
7297 [37834]: https://github.com/rust-lang/rust/pull/37834
7298 [37848]: https://github.com/rust-lang/rust/pull/37848
7299 [37855]: https://github.com/rust-lang/rust/pull/37855
7300 [37882]: https://github.com/rust-lang/rust/pull/37882
7301 [37888]: https://github.com/rust-lang/rust/pull/37888
7302 [37973]: https://github.com/rust-lang/rust/pull/37973
7303 [37979]: https://github.com/rust-lang/rust/pull/37979
7304 [38086]: https://github.com/rust-lang/rust/pull/38086
7305 [38107]: https://github.com/rust-lang/rust/pull/38107
7306 [38117]: https://github.com/rust-lang/rust/pull/38117
7307 [38134]: https://github.com/rust-lang/rust/pull/38134
7308 [38146]: https://github.com/rust-lang/rust/pull/38146
7309 [38181]: https://github.com/rust-lang/rust/pull/38181
7310 [38182]: https://github.com/rust-lang/rust/pull/38182
7311 [38185]: https://github.com/rust-lang/rust/pull/38185
7312 [38192]: https://github.com/rust-lang/rust/pull/38192
7313 [38279]: https://github.com/rust-lang/rust/pull/38279
7314 [38835]: https://github.com/rust-lang/rust/pull/38835
7315 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7316 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7317 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7318 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7319 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7320 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7321 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7322 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7323 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7324 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7325 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7326 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7327 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7328 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7329 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7330 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7331 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7332 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7333 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7334 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7335 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7336 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7337 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7338 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7339 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7340 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7341 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7342 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7343 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7344 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7345 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7346 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7347 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7348 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7349 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7350 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7351 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7354 Version 1.14.0 (2016-12-22)
7355 ===========================
7360 * [`..` matches multiple tuple fields in enum variants, structs
7361 and tuples][36843]. [RFC 1492].
7362 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7363 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7364 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7365 dereferencing][36822]
7370 * [Mark enums with non-zero discriminant as non-zero][37224]
7371 * [Lower-case `static mut` names are linted like other
7372 statics and consts][37162]
7373 * [Fix ICE on some macros in const integer positions
7374 (e.g. `[u8; m!()]`)][36819]
7375 * [Improve error message and snippet for "did you mean `x`"][36798]
7376 * [Add a panic-strategy field to the target specification][36794]
7377 * [Include LLVM version in `--version --verbose`][37200]
7379 Compile-time Optimizations
7380 --------------------------
7382 * [Improve macro expansion performance][37569]
7383 * [Shrink `Expr_::ExprInlineAsm`][37445]
7384 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7385 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7386 * [Avoid more allocations when compiling html5ever][37373]
7387 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7388 * [Avoid some allocations in the macro parser][37318]
7389 * [Use a faster deflate setting][37298]
7390 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7391 during interning of slices][37270]
7392 * [Optimize `write_metadata`][37267]
7393 * [Don't process obligation forest cycles when stalled][37231]
7394 * [Avoid many `CrateConfig` clones][37161]
7395 * [Optimize `Substs::super_fold_with`][37108]
7396 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7397 * [Speed up `plug_leaks`][36917]
7402 * [`println!()`, with no arguments, prints newline][36825].
7403 Previously, an empty string was required to achieve the same.
7404 * [`Wrapping` impls standard binary and unary operators, as well as
7405 the `Sum` and `Product` iterators][37356]
7406 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7408 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7409 `VecDeque` iterators][37315]
7410 * [Improve `SipHasher` performance on small values][37312]
7411 * [Add Iterator trait TrustedLen to enable better FromIterator /
7413 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7414 * [`ReadDir` implements `Debug`][37221]
7415 * [Implement `RefUnwindSafe` for atomic types][37178]
7416 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7417 * [Avoid allocations in `Decoder::read_str`][37064]
7418 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7419 * [Impl `Debug` for raw pointers to unsized data][36880]
7420 * [Don't reuse `HashMap` random seeds][37470]
7421 * [The internal memory layout of `HashMap` is more cache-friendly, for
7422 significant improvements in some operations][36692]
7423 * [`HashMap` uses less memory on 32-bit architectures][36595]
7424 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7429 * [Expose rustc cfg values to build scripts][cargo/3243]
7430 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7431 * [Fix passing --features when testing multiple packages][cargo/3280]
7432 * [Use a single profile set per workspace][cargo/3249]
7433 * [Load `replace` sections from lock files][cargo/3220]
7434 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7439 * [rustup is the recommended Rust installation method][1.14rustup]
7440 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7441 S390x. These are [tier 2] platforms and may have major defects. Follow the
7442 instructions on the website to install, or add the targets to an existing
7443 installation with `rustup target add`. The new target triples are:
7444 - `mips-unknown-linux-gnu`
7445 - `mipsel-unknown-linux-gnu`
7446 - `mips64-unknown-linux-gnuabi64`
7447 - `mips64el-unknown-linux-gnuabi64 `
7448 - `powerpc-unknown-linux-gnu`
7449 - `powerpc64-unknown-linux-gnu`
7450 - `powerpc64le-unknown-linux-gnu`
7451 - `s390x-unknown-linux-gnu `
7452 * This release includes target (std) builds for ARM Linux running MUSL
7453 libc. These are [tier 2] platforms and may have major defects. Add the
7454 following triples to an existing rustup installation with `rustup target add`:
7455 - `arm-unknown-linux-musleabi`
7456 - `arm-unknown-linux-musleabihf`
7457 - `armv7-unknown-linux-musleabihf`
7458 * This release includes [experimental support for WebAssembly][1.14wasm], via
7459 the `wasm32-unknown-emscripten` target. This target is known to have major
7460 defects. Please test, report, and fix.
7461 * rustup no longer installs documentation by default. Run `rustup
7462 component add rust-docs` to install.
7463 * [Fix line stepping in debugger][37310]
7464 * [Enable line number debuginfo in releases][37280]
7469 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7470 * [Add support for Fuchsia OS][37313]
7471 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7476 * [A number of forward-compatibility lints used by the compiler
7477 to gradually introduce language changes have been converted
7478 to deny by default][36894]:
7479 - ["use of inaccessible extern crate erroneously allowed"][36886]
7480 - ["type parameter default erroneously allowed in invalid location"][36887]
7481 - ["detects super or self keywords at the beginning of global path"][36888]
7482 - ["two overlapping inherent impls define an item with the same name
7483 were erroneously allowed"][36889]
7484 - ["floating-point constants cannot be used in patterns"][36890]
7485 - ["constants of struct or enum type can only be used in a pattern if
7486 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7487 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7488 * [Prohibit patterns in trait methods without bodies][37378]
7489 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7490 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7491 * [The `$crate` macro variable is accepted in fewer locations][37213]
7492 * [Impls specifying extra region requirements beyond the trait
7493 they implement are rejected][37167]
7494 * [Enums may not be unsized][37111]. Unsized enums are intended to
7495 work but never have. For now they are forbidden.
7496 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7498 [tier 2]: https://forge.rust-lang.org/platform-support.html
7499 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7500 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7501 [36430]: https://github.com/rust-lang/rust/pull/36430
7502 [36595]: https://github.com/rust-lang/rust/pull/36595
7503 [36692]: https://github.com/rust-lang/rust/pull/36692
7504 [36767]: https://github.com/rust-lang/rust/pull/36767
7505 [36794]: https://github.com/rust-lang/rust/pull/36794
7506 [36798]: https://github.com/rust-lang/rust/pull/36798
7507 [36819]: https://github.com/rust-lang/rust/pull/36819
7508 [36822]: https://github.com/rust-lang/rust/pull/36822
7509 [36825]: https://github.com/rust-lang/rust/pull/36825
7510 [36843]: https://github.com/rust-lang/rust/pull/36843
7511 [36880]: https://github.com/rust-lang/rust/pull/36880
7512 [36886]: https://github.com/rust-lang/rust/issues/36886
7513 [36887]: https://github.com/rust-lang/rust/issues/36887
7514 [36888]: https://github.com/rust-lang/rust/issues/36888
7515 [36889]: https://github.com/rust-lang/rust/issues/36889
7516 [36890]: https://github.com/rust-lang/rust/issues/36890
7517 [36891]: https://github.com/rust-lang/rust/issues/36891
7518 [36892]: https://github.com/rust-lang/rust/issues/36892
7519 [36894]: https://github.com/rust-lang/rust/pull/36894
7520 [36917]: https://github.com/rust-lang/rust/pull/36917
7521 [36993]: https://github.com/rust-lang/rust/pull/36993
7522 [37037]: https://github.com/rust-lang/rust/pull/37037
7523 [37064]: https://github.com/rust-lang/rust/pull/37064
7524 [37094]: https://github.com/rust-lang/rust/pull/37094
7525 [37108]: https://github.com/rust-lang/rust/pull/37108
7526 [37111]: https://github.com/rust-lang/rust/pull/37111
7527 [37161]: https://github.com/rust-lang/rust/pull/37161
7528 [37162]: https://github.com/rust-lang/rust/pull/37162
7529 [37167]: https://github.com/rust-lang/rust/pull/37167
7530 [37178]: https://github.com/rust-lang/rust/pull/37178
7531 [37200]: https://github.com/rust-lang/rust/pull/37200
7532 [37213]: https://github.com/rust-lang/rust/pull/37213
7533 [37221]: https://github.com/rust-lang/rust/pull/37221
7534 [37224]: https://github.com/rust-lang/rust/pull/37224
7535 [37230]: https://github.com/rust-lang/rust/pull/37230
7536 [37231]: https://github.com/rust-lang/rust/pull/37231
7537 [37247]: https://github.com/rust-lang/rust/pull/37247
7538 [37267]: https://github.com/rust-lang/rust/pull/37267
7539 [37270]: https://github.com/rust-lang/rust/pull/37270
7540 [37273]: https://github.com/rust-lang/rust/pull/37273
7541 [37280]: https://github.com/rust-lang/rust/pull/37280
7542 [37298]: https://github.com/rust-lang/rust/pull/37298
7543 [37306]: https://github.com/rust-lang/rust/pull/37306
7544 [37310]: https://github.com/rust-lang/rust/pull/37310
7545 [37312]: https://github.com/rust-lang/rust/pull/37312
7546 [37313]: https://github.com/rust-lang/rust/pull/37313
7547 [37315]: https://github.com/rust-lang/rust/pull/37315
7548 [37318]: https://github.com/rust-lang/rust/pull/37318
7549 [37322]: https://github.com/rust-lang/rust/pull/37322
7550 [37326]: https://github.com/rust-lang/rust/pull/37326
7551 [37351]: https://github.com/rust-lang/rust/pull/37351
7552 [37356]: https://github.com/rust-lang/rust/pull/37356
7553 [37367]: https://github.com/rust-lang/rust/pull/37367
7554 [37373]: https://github.com/rust-lang/rust/pull/37373
7555 [37378]: https://github.com/rust-lang/rust/pull/37378
7556 [37389]: https://github.com/rust-lang/rust/pull/37389
7557 [37392]: https://github.com/rust-lang/rust/pull/37392
7558 [37427]: https://github.com/rust-lang/rust/pull/37427
7559 [37439]: https://github.com/rust-lang/rust/pull/37439
7560 [37445]: https://github.com/rust-lang/rust/pull/37445
7561 [37470]: https://github.com/rust-lang/rust/pull/37470
7562 [37569]: https://github.com/rust-lang/rust/pull/37569
7563 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7564 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7565 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7566 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7567 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7568 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7569 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7572 Version 1.13.0 (2016-11-10)
7573 ===========================
7578 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7579 errors, like the `try!` macro, described in [RFC 0243].
7580 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7581 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7582 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7583 * [Fix lifetime rules for 'if' conditions][36029]
7584 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7589 * [Add the `-C link-arg` argument][36574]
7590 * [Remove the old AST-based backend from rustc_trans][35764]
7591 * [Don't enable NEON by default on armv7 Linux][35814]
7592 * [Fix debug line number info for macro expansions][35238]
7593 * [Do not emit "class method" debuginfo for types that are not
7594 DICompositeType][36008]
7595 * [Warn about multiple conflicting #[repr] hints][34623]
7596 * [When sizing DST, don't double-count nested struct prefixes][36351]
7597 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7598 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7599 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7600 * [Expand macros without recursing to avoid stack overflows][36214]
7605 * [Replace macro backtraces with labeled local uses][35702]
7606 * [Improve error message for misplaced doc comments][33922]
7607 * [Buffer unix and lock windows to prevent message interleaving][35975]
7608 * [Update lifetime errors to specifically note temporaries][36171]
7609 * [Special case a few colors for Windows][36178]
7610 * [Suggest `use self` when such an import resolves][36289]
7611 * [Be more specific when type parameter shadows primitive type][36338]
7612 * Many minor improvements
7614 Compile-time Optimizations
7615 --------------------------
7617 * [Compute and cache HIR hashes at beginning][35854]
7618 * [Don't hash types in loan paths][36004]
7619 * [Cache projections in trans][35761]
7620 * [Optimize the parser's last token handling][36527]
7621 * [Only instantiate #[inline] functions in codegen units referencing
7622 them][36524]. This leads to big improvements in cases where crates export
7623 define many inline functions without using them directly.
7624 * [Lazily allocate TypedArena's first chunk][36592]
7625 * [Don't allocate during default HashSet creation][36734]
7632 * [`overflowing_abs`]
7633 * [`RefCell::try_borrow`]
7634 * [`RefCell::try_borrow_mut`]
7639 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7640 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7642 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7643 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7644 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7645 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7646 * [Use arc4rand on FreeBSD][35884]
7647 * [memrchr: Correct aligned offset computation][35969]
7648 * [Improve Demangling of Rust Symbols][36059]
7649 * [Use monotonic time in condition variables][35048]
7650 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7651 * [Implement conversion traits for `char`][35755]
7652 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7653 * [Zero first byte of CString on drop][36264]
7654 * [Inherit overflow checks for sum and product][36372]
7655 * [Add missing Eq implementations][36423]
7656 * [Implement `Debug` for `DirEntry`][36631]
7657 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7659 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7660 * [Implement more traits for `std::io::ErrorKind`][35911]
7661 * [Optimize BinaryHeap bounds checking][36072]
7662 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7663 `extend_with_element`][36355]
7664 * [Fix overflow checking in unsigned pow()][34942]
7669 * This release includes security fixes to both curl and OpenSSL.
7670 * [Fix transitive doctests when panic=abort][cargo/3021]
7671 * [Add --all-features flag to cargo][cargo/3038]
7672 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7673 * [Don't parse the home directory more than once][cargo/3078]
7674 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7675 * [Update OpenSSL to 1.0.2j][cargo/3121]
7676 * [Add license and license_file to cargo metadata output][cargo/3110]
7677 * [Make crates-io registry URL optional in config; ignore all changes to
7678 source.crates-io][cargo/3089]
7679 * [Don't download dependencies from other platforms][cargo/3123]
7680 * [Build transitive dev-dependencies when needed][cargo/3125]
7681 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7682 * [Avoid updating registry when adding existing deps][cargo/3144]
7683 * [Warn about path overrides that won't work][cargo/3136]
7684 * [Use workspaces during `cargo install`][cargo/3146]
7685 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7686 * [Add --message-format flag][cargo/3000]
7687 * [Pass target environment for rustdoc][cargo/3205]
7688 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7689 * [Update curl and curl-sys][cargo/3241]
7690 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7695 * [rustdoc: Add the `--sysroot` argument][36586]
7696 * [rustdoc: Fix a couple of issues with the search results][35655]
7697 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7698 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7699 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7704 * [Remove unmaintained style guide][35124]
7705 * [Add s390x support][36369]
7706 * [Initial work at Haiku OS support][36727]
7707 * [Add mips-uclibc targets][35734]
7708 * [Crate-ify compiler-rt into compiler-builtins][35021]
7709 * [Add rustc version info (git hash + date) to dist tarball][36213]
7710 * Many documentation improvements
7715 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7716 * [Deny (by default) transmuting from fn item types to pointer-sized
7717 types][34923]. Continuing the long transition to zero-sized fn items,
7719 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7721 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7722 * [Fix lifetime rules for 'if' conditions][36029].
7723 * [Inherit overflow checks for sum and product][36372].
7724 * [Forbid user-defined macros named "macro_rules"][36730].
7726 [33922]: https://github.com/rust-lang/rust/pull/33922
7727 [34623]: https://github.com/rust-lang/rust/pull/34623
7728 [34923]: https://github.com/rust-lang/rust/pull/34923
7729 [34942]: https://github.com/rust-lang/rust/pull/34942
7730 [35021]: https://github.com/rust-lang/rust/pull/35021
7731 [35048]: https://github.com/rust-lang/rust/pull/35048
7732 [35074]: https://github.com/rust-lang/rust/pull/35074
7733 [35124]: https://github.com/rust-lang/rust/pull/35124
7734 [35234]: https://github.com/rust-lang/rust/pull/35234
7735 [35238]: https://github.com/rust-lang/rust/pull/35238
7736 [35354]: https://github.com/rust-lang/rust/pull/35354
7737 [35559]: https://github.com/rust-lang/rust/pull/35559
7738 [35585]: https://github.com/rust-lang/rust/pull/35585
7739 [35627]: https://github.com/rust-lang/rust/pull/35627
7740 [35655]: https://github.com/rust-lang/rust/pull/35655
7741 [35702]: https://github.com/rust-lang/rust/pull/35702
7742 [35707]: https://github.com/rust-lang/rust/pull/35707
7743 [35728]: https://github.com/rust-lang/rust/pull/35728
7744 [35734]: https://github.com/rust-lang/rust/pull/35734
7745 [35755]: https://github.com/rust-lang/rust/pull/35755
7746 [35761]: https://github.com/rust-lang/rust/pull/35761
7747 [35764]: https://github.com/rust-lang/rust/pull/35764
7748 [35814]: https://github.com/rust-lang/rust/pull/35814
7749 [35854]: https://github.com/rust-lang/rust/pull/35854
7750 [35871]: https://github.com/rust-lang/rust/pull/35871
7751 [35884]: https://github.com/rust-lang/rust/pull/35884
7752 [35911]: https://github.com/rust-lang/rust/pull/35911
7753 [35969]: https://github.com/rust-lang/rust/pull/35969
7754 [35975]: https://github.com/rust-lang/rust/pull/35975
7755 [36004]: https://github.com/rust-lang/rust/pull/36004
7756 [36008]: https://github.com/rust-lang/rust/pull/36008
7757 [36014]: https://github.com/rust-lang/rust/pull/36014
7758 [36029]: https://github.com/rust-lang/rust/pull/36029
7759 [36059]: https://github.com/rust-lang/rust/pull/36059
7760 [36072]: https://github.com/rust-lang/rust/pull/36072
7761 [36101]: https://github.com/rust-lang/rust/pull/36101
7762 [36104]: https://github.com/rust-lang/rust/pull/36104
7763 [36171]: https://github.com/rust-lang/rust/pull/36171
7764 [36173]: https://github.com/rust-lang/rust/pull/36173
7765 [36178]: https://github.com/rust-lang/rust/pull/36178
7766 [36213]: https://github.com/rust-lang/rust/pull/36213
7767 [36214]: https://github.com/rust-lang/rust/pull/36214
7768 [36264]: https://github.com/rust-lang/rust/pull/36264
7769 [36266]: https://github.com/rust-lang/rust/pull/36266
7770 [36289]: https://github.com/rust-lang/rust/pull/36289
7771 [36338]: https://github.com/rust-lang/rust/pull/36338
7772 [36351]: https://github.com/rust-lang/rust/pull/36351
7773 [36355]: https://github.com/rust-lang/rust/pull/36355
7774 [36369]: https://github.com/rust-lang/rust/pull/36369
7775 [36372]: https://github.com/rust-lang/rust/pull/36372
7776 [36423]: https://github.com/rust-lang/rust/pull/36423
7777 [36482]: https://github.com/rust-lang/rust/pull/36482
7778 [36505]: https://github.com/rust-lang/rust/pull/36505
7779 [36524]: https://github.com/rust-lang/rust/pull/36524
7780 [36527]: https://github.com/rust-lang/rust/pull/36527
7781 [36551]: https://github.com/rust-lang/rust/pull/36551
7782 [36574]: https://github.com/rust-lang/rust/pull/36574
7783 [36586]: https://github.com/rust-lang/rust/pull/36586
7784 [36592]: https://github.com/rust-lang/rust/pull/36592
7785 [36631]: https://github.com/rust-lang/rust/pull/36631
7786 [36721]: https://github.com/rust-lang/rust/pull/36721
7787 [36727]: https://github.com/rust-lang/rust/pull/36727
7788 [36730]: https://github.com/rust-lang/rust/pull/36730
7789 [36734]: https://github.com/rust-lang/rust/pull/36734
7790 [36754]: https://github.com/rust-lang/rust/pull/36754
7791 [36995]: https://github.com/rust-lang/rust/pull/36995
7792 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7793 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7794 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7795 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7796 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7797 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7798 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7799 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7800 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7801 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7802 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7803 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7804 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7805 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7806 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7807 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7808 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7809 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7810 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7811 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7812 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7813 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7814 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7815 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7816 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7817 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7818 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7819 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7820 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7821 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7822 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7823 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7826 Version 1.12.1 (2016-10-20)
7827 ===========================
7832 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7833 * [Confusion with double negation and booleans][36856]
7834 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7835 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7836 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7837 * [Corrupted memory after updated to 1.12][36936]
7838 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7839 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7840 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7842 [36381]: https://github.com/rust-lang/rust/issues/36381
7843 [36856]: https://github.com/rust-lang/rust/issues/36856
7844 [36875]: https://github.com/rust-lang/rust/issues/36875
7845 [36924]: https://github.com/rust-lang/rust/issues/36924
7846 [36926]: https://github.com/rust-lang/rust/issues/36926
7847 [36936]: https://github.com/rust-lang/rust/issues/36936
7848 [37026]: https://github.com/rust-lang/rust/issues/37026
7849 [37112]: https://github.com/rust-lang/rust/issues/37112
7850 [37153]: https://github.com/rust-lang/rust/issues/37153
7853 Version 1.12.0 (2016-09-29)
7854 ===========================
7859 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7860 This translation pass is far simpler than the previous AST->LLVM pass, and
7861 creates opportunities to perform new optimizations directly on the MIR. It
7862 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7863 * [`rustc` presents a new, more readable error format, along with
7864 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7865 Most common editors supporting Rust have been updated to work with it. It was
7866 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7871 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7872 This translation pass is far simpler than the previous AST->LLVM pass, and
7873 creates opportunities to perform new optimizations directly on the MIR. It
7874 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7875 * [Print the Rust target name, not the LLVM target name, with
7876 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7877 * [The computation of `TypeId` is correct in some cases where it was previously
7878 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7879 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7880 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7881 `--print relocation-models`, and `--print code-models` print the available
7882 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7883 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7884 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7885 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7886 These targets produce statically-linked binaries. There are no binary release
7892 * [`rustc` presents a new, more readable error format, along with
7893 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7894 Most common editors supporting Rust have been updated to work with it. It was
7895 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7896 * [In error descriptions, references are now described in plain English,
7897 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7898 * [In error type descriptions, unknown numeric types are named `{integer}` or
7899 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7900 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7905 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7906 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7907 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7908 useful](https://github.com/rust-lang/rust/pull/34908)
7909 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7910 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7911 * [Semicolons are properly required as statement delimiters inside
7912 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7913 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7918 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7919 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7920 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7921 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7922 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7923 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7924 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7925 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7926 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7927 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7928 Both on Unix and Windows.
7929 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7930 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7931 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7932 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7933 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7934 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7935 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7936 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7941 * [The `format!` macro and friends now allow a single argument to be formatted
7942 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7943 * [The lifetime bounds on `[T]::binary_search_by` and
7944 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7945 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7946 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7947 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7948 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7949 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7950 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7951 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7952 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7953 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7954 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7955 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7956 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7957 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7958 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7959 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7960 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7961 * [`mpsc::sync_channel` `Receiver`s return any available message before
7962 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7963 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7964 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7969 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7970 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7971 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7972 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7973 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7974 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7975 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7976 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7977 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7978 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7979 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7980 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7981 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7982 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7983 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7984 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7989 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7990 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7995 * [Test binaries now support a `--test-threads` argument to specify the number
7996 of threads used to run tests, and which acts the same as the
7997 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7998 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7999 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
8000 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8001 * [Rust releases now come with source packages that can be installed by rustup
8002 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
8003 The resulting source code can be used by tools and IDES, located in the
8004 sysroot under `lib/rustlib/src`.
8009 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8010 * Many minor improvements to the documentation.
8011 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8016 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8017 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8018 * [When formatting strings, if "precision" is specified, the "fill",
8019 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8020 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8023 Version 1.11.0 (2016-08-18)
8024 ===========================
8029 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8030 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8031 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8032 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8037 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8038 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8039 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8040 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8041 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8042 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8043 (in libcore - previously stabilized in libstd)
8044 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8045 (in libcore - previously stabilized in libstd)
8046 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8047 (in libcore - previously stabilized in libstd)
8048 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8049 (in libcore - previously stabilized in libstd)
8050 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8051 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8052 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8053 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8058 * [The `thread_local!` macro supports multiple definitions in a single
8059 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8060 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8061 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8062 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8063 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8064 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8065 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8066 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8071 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8072 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8073 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8074 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8075 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8076 and `-vv` prints warnings for all crates.
8077 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8078 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8079 This provides room for expansion by arbitrary tools.
8080 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8081 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8082 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8083 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8084 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8085 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8086 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8091 * [Caching projections speeds up type check dramatically for some
8092 workloads](https://github.com/rust-lang/rust/pull/33816)
8093 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8094 This hasher is faster, but is believed to provide sufficient
8095 protection from collision attacks.
8096 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8101 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8102 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8103 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8104 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8105 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8110 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8111 * [When emitting debug info, rustc emits frame pointers for closures,
8112 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8113 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8114 * Many more errors have been given error codes and extended
8116 * API documentation continues to be improved, with many new examples
8121 * [rustc no longer hangs when dependencies recursively re-export
8122 submodules](https://github.com/rust-lang/rust/pull/34542)
8123 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8124 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8125 rewritten](https://github.com/rust-lang/rust/pull/33895)
8126 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8127 No targets use this yet, but it works toward AVR support.
8132 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8133 * [The new follow-set rules that place restrictions on `macro_rules!`
8134 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8135 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8136 and has been a warning since 1.10.
8137 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8138 This causes breakage in some corner cases.
8141 Version 1.10.0 (2016-07-07)
8142 ===========================
8147 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8148 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8149 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8150 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8151 * [`panic!` can be converted to a runtime abort with the
8152 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8153 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8154 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8155 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8156 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8157 Note that Cargo does not yet directly support cdylibs.
8162 * `os::windows::fs::OpenOptionsExt::access_mode`
8163 * `os::windows::fs::OpenOptionsExt::share_mode`
8164 * `os::windows::fs::OpenOptionsExt::custom_flags`
8165 * `os::windows::fs::OpenOptionsExt::attributes`
8166 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8167 * `os::unix::fs::OpenOptionsExt::custom_flags`
8168 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8169 * `Default for sync::Weak`
8170 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8171 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8172 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8173 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8174 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8175 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8176 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8177 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8178 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8179 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8180 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8181 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8182 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8183 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8184 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8185 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8186 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8187 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8188 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8189 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8190 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8191 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8192 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8193 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8194 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8195 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8196 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8197 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8198 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8199 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8200 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8201 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8202 * Read/Write/RawFd impls for `UnixStream`
8203 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8204 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8205 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8206 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8207 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8208 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8209 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8210 * RawFd impls for `UnixListener`
8211 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8212 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8213 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8214 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8215 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8216 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8217 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8218 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8219 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8220 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8221 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8222 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8223 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8224 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8225 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8226 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8227 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8228 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8229 * RawFd impls for `UnixDatagram`
8230 * `{BTree,Hash}Map::values_mut`
8231 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8236 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8237 The semantics of this minor method are subtle and probably not what
8239 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8240 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8241 will fall back to `/dev/urandom` temporarily to avoid blocking
8242 during early boot](https://github.com/rust-lang/rust/pull/33086).
8243 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8244 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8245 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8246 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8247 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8248 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8249 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8253 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8254 This controls the runtime behavior of the `panic!` macro
8255 and can be either "unwind" (the default), or "abort".
8256 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8257 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8258 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8259 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8260 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8261 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8262 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8263 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8264 By default they are retried twice, which can be customized with the
8265 `net.retry` value in `.cargo/config`.
8266 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8267 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8268 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8269 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8270 Makes it possible to install multiple crates in parallel.
8271 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8272 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8273 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8274 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8275 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8276 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8281 * [rustc memory usage was reduced by refactoring the context used for
8282 type checking](https://github.com/rust-lang/rust/pull/33425).
8283 * [Speed up creation of `HashMap`s by caching the random keys used
8284 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8285 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8286 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8287 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8288 10x faster than the previous lookup tables.
8289 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8294 * Many incremental improvements to documentation and rustdoc.
8295 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8296 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8297 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8298 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8299 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8300 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8301 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8306 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8307 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8308 * [`std` no longer prints backtraces on platforms where the running
8309 module must be loaded with `env::current_exe`, which can't be relied
8310 on](https://github.com/rust-lang/rust/pull/33554).
8311 * This release includes std binaries for the i586-unknown-linux-gnu,
8312 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8313 i586 target is for old x86 hardware without SSE2, and the armv7
8314 target is for Android running on modern ARM architectures.
8315 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8316 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8317 * [On Unix the runtime aborts by calling `libc::abort` instead of
8318 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8319 * [Rust is now bootstrapped from the previous release of Rust,
8320 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8325 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8326 * [`target_env` for Linux ARM targets is just `gnu`, not
8327 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8328 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8329 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8330 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8331 Affects how macros are parsed.
8332 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8333 * [Feature-gated attributes on macro-generated macro invocations are
8334 now rejected](https://github.com/rust-lang/rust/pull/32791).
8335 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8336 This caused some minor changes to type inference.
8339 Version 1.9.0 (2016-05-26)
8340 ==========================
8345 * The `#[deprecated]` attribute when applied to an API will generate
8346 warnings when used. The warnings may be suppressed with
8347 `#[allow(deprecated)]`. [RFC 1270].
8348 * [`fn` item types are zero sized, and each `fn` names a unique
8349 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8350 `transmute` on a `fn` type will generate a warning for a few cycles,
8351 then will be converted to an error.
8352 * [Field and method resolution understand visibility, so private
8353 fields and methods cannot prevent the proper use of public fields
8354 and methods][1.9fv].
8355 * [The parser considers unicode codepoints in the
8356 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8362 * [`std::panic::catch_unwind`] (renamed from `recover`)
8363 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8364 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8365 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8366 * [`str::is_char_boundary`]
8367 * [`<*const T>::as_ref`]
8368 * [`<*mut T>::as_ref`]
8369 * [`<*mut T>::as_mut`]
8370 * [`AsciiExt::make_ascii_uppercase`]
8371 * [`AsciiExt::make_ascii_lowercase`]
8372 * [`char::decode_utf16`]
8373 * [`char::DecodeUtf16`]
8374 * [`char::DecodeUtf16Error`]
8375 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8376 * [`BTreeSet::take`]
8377 * [`BTreeSet::replace`]
8380 * [`HashSet::replace`]
8382 * [`OsString::with_capacity`]
8383 * [`OsString::clear`]
8384 * [`OsString::capacity`]
8385 * [`OsString::reserve`]
8386 * [`OsString::reserve_exact`]
8387 * [`OsStr::is_empty`]
8389 * [`std::os::unix::thread`]
8392 * [`JoinHandleExt::as_pthread_t`]
8393 * [`JoinHandleExt::into_pthread_t`]
8394 * [`HashSet::hasher`]
8395 * [`HashMap::hasher`]
8396 * [`CommandExt::exec`]
8397 * [`File::try_clone`]
8398 * [`SocketAddr::set_ip`]
8399 * [`SocketAddr::set_port`]
8400 * [`SocketAddrV4::set_ip`]
8401 * [`SocketAddrV4::set_port`]
8402 * [`SocketAddrV6::set_ip`]
8403 * [`SocketAddrV6::set_port`]
8404 * [`SocketAddrV6::set_flowinfo`]
8405 * [`SocketAddrV6::set_scope_id`]
8406 * [`slice::copy_from_slice`]
8407 * [`ptr::read_volatile`]
8408 * [`ptr::write_volatile`]
8409 * [`OpenOptions::create_new`]
8410 * [`TcpStream::set_nodelay`]
8411 * [`TcpStream::nodelay`]
8412 * [`TcpStream::set_ttl`]
8413 * [`TcpStream::ttl`]
8414 * [`TcpStream::set_only_v6`]
8415 * [`TcpStream::only_v6`]
8416 * [`TcpStream::take_error`]
8417 * [`TcpStream::set_nonblocking`]
8418 * [`TcpListener::set_ttl`]
8419 * [`TcpListener::ttl`]
8420 * [`TcpListener::set_only_v6`]
8421 * [`TcpListener::only_v6`]
8422 * [`TcpListener::take_error`]
8423 * [`TcpListener::set_nonblocking`]
8424 * [`UdpSocket::set_broadcast`]
8425 * [`UdpSocket::broadcast`]
8426 * [`UdpSocket::set_multicast_loop_v4`]
8427 * [`UdpSocket::multicast_loop_v4`]
8428 * [`UdpSocket::set_multicast_ttl_v4`]
8429 * [`UdpSocket::multicast_ttl_v4`]
8430 * [`UdpSocket::set_multicast_loop_v6`]
8431 * [`UdpSocket::multicast_loop_v6`]
8432 * [`UdpSocket::set_multicast_ttl_v6`]
8433 * [`UdpSocket::multicast_ttl_v6`]
8434 * [`UdpSocket::set_ttl`]
8435 * [`UdpSocket::ttl`]
8436 * [`UdpSocket::set_only_v6`]
8437 * [`UdpSocket::only_v6`]
8438 * [`UdpSocket::join_multicast_v4`]
8439 * [`UdpSocket::join_multicast_v6`]
8440 * [`UdpSocket::leave_multicast_v4`]
8441 * [`UdpSocket::leave_multicast_v6`]
8442 * [`UdpSocket::take_error`]
8443 * [`UdpSocket::connect`]
8444 * [`UdpSocket::send`]
8445 * [`UdpSocket::recv`]
8446 * [`UdpSocket::set_nonblocking`]
8451 * [`std::sync::Once` is poisoned if its initialization function
8453 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8454 * [Most types implement `fmt::Debug`][1.9db].
8455 * [The default buffer size used by `BufReader` and `BufWriter` was
8456 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8457 used by other languages.
8458 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8459 `Duration` additionally implements `*=` and `/=`][1.9ta].
8460 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8461 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8462 * [`Chain` implements `BufRead`][1.9ch].
8463 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8468 * [Cargo can now run concurrently][1.9cc].
8469 * [Top-level overrides allow specific revisions of crates to be
8470 overridden through the entire crate graph][1.9ct]. This is intended
8471 to make upgrades easier for large projects, by allowing crates to be
8472 forked temporarily until they've been upgraded and republished.
8473 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8474 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8475 on the commandline][1.9cf]. `rustc` arguments can also be specified
8476 in the `build.rustflags` configuration key.
8481 * [The time complexity of comparing variables for equivalence during type
8482 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8483 to major compilation time improvement in some scenarios.
8484 * [`ToString` is specialized for `str`, giving it the same performance
8485 as `to_owned`][1.9ts].
8486 * [Spawning processes with `Command::output` no longer creates extra
8488 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8489 for C-like enums][1.9cl].
8494 * [Passing the `--quiet` flag to a test runner will produce
8495 much-abbreviated output][1.9q].
8496 * The Rust Project now publishes std binaries for the
8497 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8498 `i586-pc-windows-msvc` targets.
8503 * [`std::sync::Once` is poisoned if its initialization function
8505 * [It is illegal to define methods with the same name in overlapping
8506 inherent `impl` blocks][1.9sn].
8507 * [`fn` item types are zero sized, and each `fn` names a unique
8508 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8509 `transmute` on a `fn` type will generate a warning for a few cycles,
8510 then will be converted to an error.
8511 * [Improvements to const evaluation may trigger new errors when integer
8512 literals are out of range][1.9ce].
8515 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8516 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8517 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8518 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8519 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8520 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8521 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8522 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8523 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8524 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8525 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8526 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8527 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8528 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8529 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8530 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8531 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8532 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8533 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8534 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8535 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8536 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8537 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8538 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8539 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8540 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8541 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8542 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8543 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8544 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8545 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8546 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8547 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8548 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8549 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8550 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8551 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8552 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8553 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8554 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8555 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8556 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8557 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8558 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8559 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8560 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8561 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8562 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8563 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8564 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8565 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8566 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8567 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8568 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8569 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8570 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8571 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8572 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8573 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8574 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8575 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8576 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8577 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8578 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8579 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8580 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8581 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8582 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8583 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8584 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8585 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8586 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8587 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8588 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8589 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8590 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8591 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8592 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8593 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8594 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8595 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8596 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8597 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8598 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8599 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8600 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8601 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8602 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8603 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8604 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8605 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8606 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8607 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8608 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8609 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8610 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8611 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8612 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8613 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8614 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8615 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8616 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8617 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8618 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8619 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8620 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8621 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8622 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8623 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8624 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8627 Version 1.8.0 (2016-04-14)
8628 ==========================
8633 * Rust supports overloading of compound assignment statements like
8634 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8635 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8636 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8638 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8639 addition to the non-braced form, `struct Foo;`. [RFC 218].
8645 * [`str::encode_utf16`] (renamed from `utf16_units`)
8646 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8649 * [`ptr::drop_in_place`]
8651 * [`time::SystemTime`]
8653 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8654 * [`Instant::elapsed`]
8655 * [`SystemTime::now`]
8656 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8657 * [`SystemTime::elapsed`]
8658 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8659 * [`SystemTimeError`]
8660 * [`SystemTimeError::duration`]
8661 * Various impls for `SystemTimeError`
8663 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8664 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8665 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8666 * [The `write!` and `writeln!` macros correctly emit errors if any of
8667 their arguments can't be formatted][1.8w].
8668 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8669 * [The Unix-specific `raw` modules, which contain a number of
8670 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8671 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8672 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8673 across platforms was making it difficult to implement `std`
8674 correctly. Those that need these definitions should use the `libc`
8676 * The Unix-specific `MetadataExt` traits, including
8677 `os::unix::fs::MetadataExt`, which expose values such as inode
8678 numbers [no longer return platform-specific types][1.8r], but
8679 instead return widened integers. [RFC 1415].
8680 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8681 * [Atomic loads and stores are not volatile][1.8a].
8682 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8687 * [Inlining hash functions lead to a 3% compile-time improvement in
8688 some workloads][1.8h].
8689 * When using jemalloc, its symbols are [unprefixed so that it
8690 overrides the libc malloc implementation][1.8h]. This means that for
8691 rustc, LLVM is now using jemalloc, which results in a 6%
8692 compile-time improvement on a specific workload.
8693 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8698 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8699 i686-pc-windows-msvc is now considered a tier-1 platform.
8700 * [The `--print targets` flag prints a list of supported targets][1.8t].
8701 * [The `--print cfg` flag prints the `cfg`s defined for the current
8703 * [`rustc` can be built with an new Cargo-based build system, written
8704 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8705 build system. To enable it configure with `configure --rustbuild`.
8706 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8707 variants while also indicating the total number of missing variants
8708 if more than 3][1.8m].
8709 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8710 * The Rust Project now publishes binary releases of the standard
8711 library for a number of tier-2 targets:
8712 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8713 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8714 `x86_64-rumprun-netbsd`. These can be installed with
8715 tools such as [multirust][1.8mr].
8720 * [`cargo init` creates a new Cargo project in the current
8721 directory][1.8ci]. It is otherwise like `cargo new`.
8722 * [Cargo has configuration keys for `-v` and
8723 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8724 `[term]` section of `.cargo/config`.
8725 * [Configuration keys that evaluate to strings or integers can be set
8726 via environment variables][1.8ce]. For example the `build.jobs` key
8727 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8728 precedence over config files.
8729 * [Target-specific dependencies support Rust `cfg` syntax for
8730 describing targets][1.8cfg] so that dependencies for multiple
8731 targets can be specified together. [RFC 1361].
8732 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8733 `RUSTDOC` take precedence over the `build.target-dir`,
8734 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8735 * [The child process tree is killed on Windows when Cargo is
8737 * [The `build.target` configuration value sets the target platform,
8738 like `--target`][1.8ct].
8743 * [Unstable compiler flags have been further restricted][1.8u]. Since
8744 1.0 `-Z` flags have been considered unstable, and other flags that
8745 were considered unstable additionally required passing `-Z
8746 unstable-options` to access. Unlike unstable language and library
8747 features though, these options have been accessible on the stable
8748 release channel. Going forward, *new unstable flags will not be
8749 available on the stable release channel*, and old unstable flags
8750 will warn about their usage. In the future, all unstable flags will
8751 be unavailable on the stable release channel.
8752 * [It is no longer possible to `match` on empty enum variants using
8753 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8754 * The Unix-specific `MetadataExt` traits, including
8755 `os::unix::fs::MetadataExt`, which expose values such as inode
8756 numbers [no longer return platform-specific types][1.8r], but
8757 instead return widened integers. [RFC 1415].
8758 * [Modules sourced from the filesystem cannot appear within arbitrary
8759 blocks, but only within other modules][1.8mf].
8760 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8761 * On Unix, [stack overflow triggers a runtime abort instead of a
8763 * [`Command::spawn` and its equivalents return an error if any of
8764 its command-line arguments contain interior `NUL`s][1.8n].
8765 * [Tuple and unit enum variants from other crates are in the type
8767 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8768 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8769 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8770 instead of `foo.lib`.
8773 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8774 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8775 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8776 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8777 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8778 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8779 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8780 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8781 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8782 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8783 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8784 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8785 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8786 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8787 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8788 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8789 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8790 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8791 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8792 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8793 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8794 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8795 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8796 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8797 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8798 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8799 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8800 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8801 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8802 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8803 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8804 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8805 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8806 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8807 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8808 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8809 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8810 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8811 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8812 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8813 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8814 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8815 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8816 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8817 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8818 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8819 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8820 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8821 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8822 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8823 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8824 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8825 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8826 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8827 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8828 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8829 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8830 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8831 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8832 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8835 Version 1.7.0 (2016-03-03)
8836 ==========================
8843 * [`Path::strip_prefix`] (renamed from relative_from)
8844 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8846 * [`Ipv4Addr::is_loopback`]
8847 * [`Ipv4Addr::is_private`]
8848 * [`Ipv4Addr::is_link_local`]
8849 * [`Ipv4Addr::is_multicast`]
8850 * [`Ipv4Addr::is_broadcast`]
8851 * [`Ipv4Addr::is_documentation`]
8853 * [`Ipv6Addr::is_unspecified`]
8854 * [`Ipv6Addr::is_loopback`]
8855 * [`Ipv6Addr::is_multicast`]
8858 * [`Vec::as_mut_slice`]
8860 * [`String::as_str`]
8861 * [`String::as_mut_str`]
8863 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8865 * `<[T]>::`[`sort_by_key`]
8866 * checked, saturated, and overflowing operations
8867 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8868 * [`i32::saturating_mul`]
8869 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8870 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8871 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8872 * [`u32::saturating_mul`]
8873 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8874 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8875 * and checked, saturated, and overflowing operations for other primitive types
8877 * [`ffi::IntoStringError`]
8878 * [`CString::into_string`]
8879 * [`CString::into_bytes`]
8880 * [`CString::into_bytes_with_nul`]
8881 * `From<CString> for Vec<u8>`
8883 * [`IntoStringError::into_cstring`]
8884 * [`IntoStringError::utf8_error`]
8885 * `Error for IntoStringError`
8887 * [`std::hash::BuildHasher`]
8888 * [`BuildHasher::Hasher`]
8889 * [`BuildHasher::build_hasher`]
8890 * [`std::hash::BuildHasherDefault`]
8891 * [`HashMap::with_hasher`]
8892 * [`HashMap::with_capacity_and_hasher`]
8893 * [`HashSet::with_hasher`]
8894 * [`HashSet::with_capacity_and_hasher`]
8895 * [`std::collections::hash_map::RandomState`]
8896 * [`RandomState::new`]
8897 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8898 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8899 from bytes is faster.
8900 * [The performance of `LineWriter` (and thus `io::stdout`) was
8901 improved by using `memchr` to search for newlines][1.7m].
8902 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8903 `f64` variants were stabilized previously.
8904 * [`BTreeMap` was rewritten to use less memory and improve the performance
8905 of insertion and iteration, the latter by as much as 5x][1.7bm].
8906 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8907 covariant over their contained type][1.7bt].
8908 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8909 over their contained type][1.7ll].
8910 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8912 * [`Any` is implemented for unsized types][1.7a].
8913 * [`Hash` is implemented for `Duration`][1.7h].
8918 * [When running tests with `--test`, rustdoc will pass `--cfg`
8919 arguments to the compiler][1.7dt].
8920 * [The compiler is built with RPATH information by default][1.7rpa].
8921 This means that it will be possible to run `rustc` when installed in
8922 unusual configurations without configuring the dynamic linker search
8924 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8925 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8926 over `LD_LIBRARY_PATH`.
8931 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8932 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8933 * [The `rerun-if-changed` build script directive no longer causes the
8934 build script to incorrectly run twice in certain scenarios][1.7rr].
8939 * Soundness fixes to the interactions between associated types and
8940 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8941 code that violates the new rules. This is a significant change that
8942 is known to break existing code, so it has emitted warnings for the
8943 new error cases since 1.4 to give crate authors time to adapt. The
8944 details of what is changing are subtle; read the RFC for more.
8945 * [Several bugs in the compiler's visibility calculations were
8946 fixed][1.7v]. Since this was found to break significant amounts of
8947 code, the new errors will be emitted as warnings for several release
8948 cycles, under the `private_in_public` lint.
8949 * Defaulted type parameters were accidentally accepted in positions
8950 that were not intended. In this release, [defaulted type parameters
8951 appearing outside of type definitions will generate a
8952 warning][1.7d], which will become an error in future releases.
8953 * [Parsing "." as a float results in an error instead of 0][1.7p].
8954 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8955 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8957 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8958 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8959 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8960 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8961 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8962 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8963 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8964 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8965 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8966 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8967 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8968 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8969 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8970 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8971 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8972 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8973 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8974 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8975 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8976 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8977 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8978 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8979 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8980 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8981 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8982 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8983 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8984 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8985 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8986 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8987 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8988 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8989 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8990 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8991 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8992 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8993 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8994 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8995 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8996 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8997 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8998 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8999 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
9000 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
9001 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
9002 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
9003 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9004 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9005 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9006 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9007 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9008 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9009 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9010 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9011 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9012 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9013 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9014 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9015 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9016 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9017 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9018 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9019 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9020 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9021 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9022 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9023 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9024 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9025 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9026 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9027 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9028 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9029 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9030 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9031 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9032 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9033 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9034 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9035 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9038 Version 1.6.0 (2016-01-21)
9039 ==========================
9044 * The `#![no_std]` attribute causes a crate to not be linked to the
9045 standard library, but only the [core library][1.6co], as described
9046 in [RFC 1184]. The core library defines common types and traits but
9047 has no platform dependencies whatsoever, and is the basis for Rust
9048 software in environments that cannot support a full port of the
9049 standard library, such as operating systems. Most of the core
9050 library is now stable.
9056 [`Read::read_exact`],
9057 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9058 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9059 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9060 [`os::unix::fs::DirBuilderExt`],
9061 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9062 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9063 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9064 [`collections::hash_map::Drain`],
9065 [`collections::hash_map::HashMap::drain`],
9066 [`collections::hash_set::Drain`],
9067 [`collections::hash_set::HashSet::drain`],
9068 [`collections::binary_heap::Drain`],
9069 [`collections::binary_heap::BinaryHeap::drain`],
9070 [`Vec::extend_from_slice`] (renamed from `push_all`),
9071 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9072 [`RwLock::into_inner`],
9073 [`Iterator::min_by_key`] (renamed from `min_by`),
9074 [`Iterator::max_by_key`] (renamed from `max_by`).
9075 * The [core library][1.6co] is stable, as are most of its APIs.
9076 * [The `assert_eq!` macro supports arguments that don't implement
9077 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9079 * Several timer functions that take duration in milliseconds [are
9080 deprecated in favor of those that take `Duration`][1.6ms]. These
9081 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9082 `thread::park_timeout_ms`.
9083 * The algorithm by which `Vec` reserves additional elements was
9084 [tweaked to not allocate excessive space][1.6a] while still growing
9086 * `From` conversions are [implemented from integers to floats][1.6f]
9087 in cases where the conversion is lossless. Thus they are not
9088 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9089 or `f64`. They are also not implemented for `isize` and `usize`
9090 because the implementations would be platform-specific. `From` is
9091 also implemented from `f32` to `f64`.
9092 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9093 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9094 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9095 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9097 * Sorting slices that are already sorted [is 50% faster in some
9103 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9104 * Cargo build scripts can specify their dependencies by emitting the
9105 [`rerun-if-changed`][1.6rr] key.
9106 * crates.io will reject publication of crates with dependencies that
9107 have a wildcard version constraint. Crates with wildcard
9108 dependencies were seen to cause a variety of problems, as described
9109 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9111 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9112 release folder. A variety of artifacts that Cargo failed to clean
9113 are now correctly deleted.
9118 * The `unreachable_code` lint [warns when a function call's argument
9120 * The parser indicates [failures that may be caused by
9121 confusingly-similar Unicode characters][1.6uc]
9122 * Certain macro errors [are reported at definition time][1.6m], not
9128 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9129 environment variable when locating crates. This was a pre-cargo
9130 feature for integrating with the package manager that was
9131 accidentally never removed.
9132 * [A number of bugs were fixed in the privacy checker][1.6p] that
9133 could cause previously-accepted code to break.
9134 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9135 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9136 struct pattern syntax (`Foo(..)`) can no longer be used to match
9137 unit structs. This is a warning now, but will become an error in
9138 future releases. Patterns that share the same name as a const are
9140 * A bug was fixed that causes [rustc not to apply default type
9141 parameters][1.6xc] when resolving certain method implementations of
9142 traits defined in other crates.
9144 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9145 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9146 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9147 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9148 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9149 [1.6co]: http://doc.rust-lang.org/core/index.html
9150 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9151 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9152 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9153 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9154 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9155 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9156 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9157 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9158 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9159 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9160 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9161 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9162 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9163 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9164 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9165 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9166 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9167 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9168 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9169 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9170 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9171 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9172 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9173 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9174 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9175 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9176 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9177 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9178 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9179 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9180 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9181 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9182 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9183 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9184 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9185 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9186 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9187 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9188 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9189 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9190 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9193 Version 1.5.0 (2015-12-10)
9194 ==========================
9196 * ~700 changes, numerous bugfixes
9202 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9203 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9204 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9205 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9206 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9207 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9208 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9209 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9210 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9211 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9212 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9213 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9214 [`Path::read_link`], [`Path::symlink_metadata`],
9215 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9216 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9217 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9218 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9219 [`slice::split_first_mut`], [`slice::split_first`],
9220 [`slice::split_last_mut`], [`slice::split_last`],
9221 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9222 [`str::MatchIndices`], [`str::RMatchIndices`],
9223 [`str::match_indices`], [`str::rmatch_indices`],
9224 [`str::slice_mut_unchecked`], [`string::ParseError`].
9225 * Rust applications hosted on crates.io can be installed locally to
9226 `~/.cargo/bin` with the [`cargo install`] command. Among other
9227 things this makes it easier to augment Cargo with new subcommands:
9228 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9229 invoked as `cargo foo`.
9230 * Crates with wildcard (`*`) dependencies will [emit warnings when
9231 published][1.5w]. In 1.6 it will no longer be possible to publish
9232 crates with wildcard dependencies.
9237 * The rules determining when a particular lifetime must outlive
9238 a particular value (known as '[dropck]') have been [modified
9239 to not rely on parametricity][1.5p].
9240 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9241 and `Arc`][1.5a]. Because these smart pointer types implement
9242 `Deref`, this causes breakage in cases where the interior type
9243 contains methods of the same name.
9244 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9245 that they could drop their content. Soundness fix.
9246 * All method invocations are [properly checked][1.5wf1] for
9247 [well-formedness][1.5wf2]. Soundness fix.
9248 * Traits whose supertraits contain `Self` are [not object
9249 safe][1.5o]. Soundness fix.
9250 * Target specifications support a [`no_default_libraries`][1.5nd]
9251 setting that controls whether `-nodefaultlibs` is passed to the
9252 linker, and in turn the `is_like_windows` setting no longer affects
9253 the `-nodefaultlibs` flag.
9254 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9255 * The `#[inline]` and `#[repr]` attributes [can only appear
9256 in valid locations][1.5at].
9257 * Native libraries linked from the local crate are [passed to
9258 the linker before native libraries from upstream crates][1.5nl].
9259 * Two rarely-used attributes, `#[no_debug]` and
9260 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9261 * Negation of unsigned integers, which has been a warning for
9262 several releases, [is now behind a feature gate and will
9263 generate errors][1.5nu].
9264 * The parser accidentally accepted visibility modifiers on
9265 enum variants, a bug [which has been fixed][1.5ev].
9266 * [A bug was fixed that allowed `use` statements to import unstable
9272 * When evaluating expressions at compile-time that are not
9273 compile-time constants (const-evaluating expressions in non-const
9274 contexts), incorrect code such as overlong bitshifts and arithmetic
9275 overflow will [generate a warning instead of an error][1.5ce],
9276 delaying the error until runtime. This will allow the
9277 const-evaluator to be expanded in the future backwards-compatibly.
9278 * The `improper_ctypes` lint [no longer warns about using `isize` and
9279 `usize` in FFI][1.5ict].
9284 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9286 * `Default` is [implemented for mutable slices][1.5d].
9287 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9288 * There are now `From` conversions [between floating point
9289 types][1.5f] where the conversions are lossless.
9290 * There are now `From` conversions [between integer types][1.5i] where
9291 the conversions are lossless.
9292 * [`fs::Metadata` implements `Clone`][1.5fs].
9293 * The `parse` method [accepts a leading "+" when parsing
9295 * [`AsMut` is implemented for `Vec`][1.5am].
9296 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9297 been optimized][1.5cf] and no longer rely on the default impl.
9298 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9299 `unsafe extern "C"` function types now [implement `Clone`,
9300 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9301 `fmt::Debug` for up to 12 arguments][1.5fp].
9302 * [Dropping `Vec`s is much faster in unoptimized builds when the
9303 element types don't implement `Drop`][1.5dv].
9304 * A bug that caused in incorrect behavior when [combining `VecDeque`
9305 with zero-sized types][1.5vdz] was resolved.
9306 * [`PartialOrd` for slices is faster][1.5po].
9311 * [Crate metadata size was reduced by 20%][1.5md].
9312 * [Improvements to code generation reduced the size of libcore by 3.3
9313 MB and rustc's memory usage by 18MB][1.5m].
9314 * [Improvements to deref translation increased performance in
9315 unoptimized builds][1.5dr].
9316 * Various errors in trait resolution [are deduplicated to only be
9317 reported once][1.5te].
9318 * Rust has preliminary [support for rumprun kernels][1.5rr].
9319 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9321 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9322 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9323 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9324 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9325 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9326 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9327 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9328 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9329 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9330 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9331 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9332 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9333 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9334 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9335 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9336 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9337 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9338 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9339 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9340 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9341 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9342 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9343 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9344 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9345 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9346 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9347 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9348 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9349 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9350 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9351 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9352 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9353 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9354 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9355 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9356 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9357 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9358 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9359 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9360 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9361 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9362 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9363 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9364 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9365 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9366 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9367 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9368 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9369 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9370 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9371 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9372 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9373 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9374 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9375 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9376 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9377 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9378 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9379 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9380 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9381 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9382 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9383 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9384 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9385 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9386 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9387 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9388 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9389 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9390 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9391 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9392 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9393 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9394 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9395 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9396 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9397 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9398 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9399 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9400 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9401 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9402 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9403 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9404 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9405 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9406 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9407 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9408 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9409 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9411 Version 1.4.0 (2015-10-29)
9412 ==========================
9414 * ~1200 changes, numerous bugfixes
9419 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9420 GNU) are now supported and recommended for use.
9425 * [Several changes have been made to fix type soundness and improve
9426 the behavior of associated types][sound]. See [RFC 1214]. Although
9427 we have mostly introduced these changes as warnings this release, to
9428 become errors next release, there are still some scenarios that will
9429 see immediate breakage.
9430 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9431 line breaks in addition to `\n`][crlf].
9432 * [Loans of `'static` lifetime extend to the end of a function][stat].
9433 * [`str::parse` no longer introduces avoidable rounding error when
9434 parsing floating point numbers. Together with earlier changes to
9435 float formatting/output, "round trips" like f.to_string().parse()
9436 now preserve the value of f exactly. Additionally, leading plus
9437 signs are now accepted][fp3].
9443 * `use` statements that import multiple items [can now rename
9444 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9445 * [Binops work correctly on fat pointers][binfat].
9446 * `pub extern crate`, which does not behave as expected, [issues a
9447 warning][pec] until a better solution is found.
9452 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9453 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9454 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9455 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9456 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9457 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9458 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9459 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9460 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9461 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9462 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9463 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9464 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9465 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9466 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9467 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9468 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9469 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9471 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9472 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9473 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9474 `f64::from_str_radix`.
9475 * [Reverse-searching strings is faster with the 'two-way'
9477 * [`std::io::copy` allows `?Sized` arguments][cc].
9478 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9479 [override `count`, `nth` and `last` with an *O*(1)
9480 implementation][it].
9481 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9482 * [`IntoRawFd` has been added to the Unix-specific prelude,
9483 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9485 * [`Extend<String>` and `FromIterator<String` are both implemented for
9487 * [`IntoIterator` is implemented for references to `Option` and
9489 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9490 Copy`][ext] as part of [RFC 839]. This will cause type inference
9491 breakage in rare situations.
9492 * [`BinaryHeap` implements `Debug`][bh2].
9493 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9495 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9496 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9497 * [String comparison is faster][faststr].
9498 * `&mut T` where `T: std::fmt::Write` [also implements
9499 `std::fmt::Write`][mutw].
9500 * [A stable regression in `VecDeque::push_back` and other
9501 capacity-altering methods that caused panics for zero-sized types
9503 * [Function pointers implement traits for up to 12 parameters][fp2].
9508 * The compiler [no longer uses the 'morestack' feature to prevent
9509 stack overflow][mm]. Instead it uses guard pages and stack
9510 probes (though stack probes are not yet implemented on any platform
9512 * [The compiler matches traits faster when projections are involved][p].
9513 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9515 * [Cargo now displays useful information about what its doing during
9516 `cargo update`][cu].
9518 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9519 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9520 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9521 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9522 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9523 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9524 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9525 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9526 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9527 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9528 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9529 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9530 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9531 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9532 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9533 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9534 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9535 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9536 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9537 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9538 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9539 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9540 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9541 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9542 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9543 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9544 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9545 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9546 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9547 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9548 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9549 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9550 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9551 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9552 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9553 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9554 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9555 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9556 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9557 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9558 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9559 [bh2]: https://github.com/rust-lang/rust/pull/28156
9560 [binfat]: https://github.com/rust-lang/rust/pull/28270
9561 [bm]: https://github.com/rust-lang/rust/pull/28197
9562 [cc]: https://github.com/rust-lang/rust/pull/27531
9563 [crlf]: https://github.com/rust-lang/rust/pull/28034
9564 [cu]: https://github.com/rust-lang/cargo/pull/1931
9565 [d]: https://github.com/rust-lang/rust/pull/27825
9566 [dep]: https://github.com/rust-lang/rust/pull/28339
9567 [es]: https://github.com/rust-lang/rust/pull/27956
9568 [ext]: https://github.com/rust-lang/rust/pull/28094
9569 [faststr]: https://github.com/rust-lang/rust/pull/28338
9570 [ffi]: https://github.com/rust-lang/rust/pull/28779
9571 [fp]: https://github.com/rust-lang/rust/pull/28268
9572 [fp2]: https://github.com/rust-lang/rust/pull/28560
9573 [fp3]: https://github.com/rust-lang/rust/pull/27307
9574 [i]: https://github.com/rust-lang/rust/pull/27451
9575 [into2]: https://github.com/rust-lang/rust/pull/28039
9576 [it]: https://github.com/rust-lang/rust/pull/27652
9577 [mm]: https://github.com/rust-lang/rust/pull/27338
9578 [mutw]: https://github.com/rust-lang/rust/pull/28368
9579 [sound]: https://github.com/rust-lang/rust/pull/27641
9580 [p]: https://github.com/rust-lang/rust/pull/27866
9581 [pec]: https://github.com/rust-lang/rust/pull/28486
9582 [pr]: https://github.com/rust-lang/rust/pull/27896
9583 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9584 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9585 [s]: https://github.com/rust-lang/rust/pull/27474
9586 [stab]: https://github.com/rust-lang/rust/pull/28339
9587 [stat]: https://github.com/rust-lang/rust/pull/28321
9588 [vd]: https://github.com/rust-lang/rust/pull/28494
9590 Version 1.3.0 (2015-09-17)
9591 ==============================
9593 * ~900 changes, numerous bugfixes
9598 * The [new object lifetime defaults][nold] have been [turned
9599 on][nold2] after a cycle of warnings about the change. Now types
9600 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9601 being interpreted as `&'a Box<Trait+'a>` to `&'a
9602 Box<Trait+'static>`.
9603 * [The Rustonomicon][nom] is a new book in the official documentation
9604 that dives into writing unsafe Rust.
9605 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9606 timekeeping is employed by other std APIs, as well as out-of-tree
9612 * The [new object lifetime defaults][nold] have been [turned
9613 on][nold2] after a cycle of warnings about the change.
9614 * There is a known [regression][lr] in how object lifetime elision is
9615 interpreted, the proper solution for which is undetermined.
9616 * The `#[prelude_import]` attribute, an internal implementation
9617 detail, was accidentally stabilized previously. [It has been put
9618 behind the `prelude_import` feature gate][pi]. This change is
9619 believed to break no existing code.
9620 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9621 [more sane for dynamically sized types][dst3]. Code that relied on
9622 the previous behavior is thought to be broken.
9623 * The `dropck` rules, which checks that destructors can't access
9624 destroyed values, [have been updated][dropck] to match the
9625 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9626 cause some previously-compiling code to no longer build.
9631 * The [new object lifetime defaults][nold] have been [turned
9632 on][nold2] after a cycle of warnings about the change.
9633 * Semicolons may [now follow types and paths in
9634 macros](https://github.com/rust-lang/rust/pull/27000).
9635 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9636 [more sane for dynamically sized types][dst3]. Code that relied on
9637 the previous behavior is not known to exist, and suspected to be
9639 * `'static` variables [may now be recursive][st].
9640 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9641 implementations correctly.
9642 * The `dropck` rules, which checks that destructors can't access
9643 destroyed values, [have been updated][dropck] to match the
9649 * The [`Duration`] API, [has been stabilized][ds], as well as the
9650 `std::time` module, which presently contains only `Duration`.
9651 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9652 * The owned C string, [`CString`], implements [`Borrow`] and the
9653 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9654 these allow C strings to be borrowed and cloned in generic code.
9655 * [`CStr`] implements [`Debug`].
9656 * [`AtomicPtr`] implements [`Debug`].
9657 * [`Error`] trait objects [can be downcast to their concrete types][e]
9658 in many common configurations, using the [`is`], [`downcast`],
9659 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9661 * Searching for substrings now [employs the two-way algorithm][search]
9662 instead of doing a naive search. This gives major speedups to a
9663 number of methods, including [`contains`][sc], [`find`][sf],
9664 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9665 [`ends_with`][sew] are also faster.
9666 * The performance of `PartialEq` for slices is [much faster][ps].
9667 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9668 is overridden and optimized by the implementations for scalars.
9669 * The [`Hasher`] trait now has a number of specialized `write_*`
9670 methods for primitive types, for efficiency.
9671 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9672 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9673 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9674 of [`std::error::Error::cause`][iec] also delegates to the inner
9676 * [`process::Child`][pc] gained the [`id`] method, which returns a
9677 `u32` representing the platform-specific process identifier.
9678 * The [`connect`] method on slices is deprecated, replaced by the new
9679 [`join`] method (note that both of these are on the *unstable*
9680 [`SliceConcatExt`] trait, but through the magic of the prelude are
9681 available to stable code anyway).
9682 * The [`Div`] operator is implemented for [`Wrapping`] types.
9683 * [`DerefMut` is implemented for `String`][dms].
9684 * Performance of SipHash (the default hasher for `HashMap`) is
9685 [better for long data][sh].
9686 * [`AtomicPtr`] implements [`Send`].
9687 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9688 are now [specialized to use uninitialized buffers for increased
9690 * Lifetime parameters of foreign functions [are now resolved
9696 * Rust can now, with some coercion, [produce programs that run on
9697 Windows XP][xp], though XP is not considered a supported platform.
9698 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9699 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9700 recommended for use in 1.3, though should be fully-functional
9701 in the [64-bit 1.4 beta][b14].
9702 * On Fedora-based systems installation will [properly configure the
9703 dynamic linker][fl].
9704 * The compiler gained many new extended error descriptions, which can
9705 be accessed with the `--explain` flag.
9706 * The `dropck` pass, which checks that destructors can't access
9707 destroyed values, [has been rewritten][27261]. This fixes some
9708 soundness holes, and as such will cause some previously-compiling
9709 code to no longer build.
9710 * `rustc` now uses [LLVM to write archive files where possible][ar].
9711 Eventually this will eliminate the compiler's dependency on the ar
9713 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9714 supported FreeBSD on x86_64).
9715 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9716 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9718 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9719 will kill the process instead of leaking][nlp].
9721 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9722 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9723 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9724 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9725 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9726 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9727 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9728 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9729 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9730 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9731 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9732 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9733 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9734 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9735 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9736 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9737 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9738 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9739 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9740 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9741 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9742 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9743 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9744 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9745 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9746 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9747 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9748 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9749 [ar]: https://github.com/rust-lang/rust/pull/26926
9750 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9751 [dms]: https://github.com/rust-lang/rust/pull/26241
9752 [27261]: https://github.com/rust-lang/rust/pull/27261
9753 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9754 [ds]: https://github.com/rust-lang/rust/pull/26818
9755 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9756 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9757 [dst3]: https://github.com/rust-lang/rust/pull/27351
9758 [e]: https://github.com/rust-lang/rust/pull/24793
9759 [f]: https://github.com/rust-lang/rust/pull/26588
9760 [26959]: https://github.com/rust-lang/rust/pull/26959
9761 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9762 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9763 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9764 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9765 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9766 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9767 [lic]: https://github.com/rust-lang/rust/pull/26583
9768 [lnu]: https://github.com/rust-lang/rust/pull/27026
9769 [lr]: https://github.com/rust-lang/rust/issues/27248
9770 [lum]: https://github.com/rust-lang/rust/pull/26378
9771 [lur]: https://github.com/rust-lang/rust/pull/26783
9772 [nlp]: https://github.com/rust-lang/rust/pull/27176
9773 [nold2]: https://github.com/rust-lang/rust/pull/27045
9774 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9775 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9776 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9777 [pi]: https://github.com/rust-lang/rust/pull/26699
9778 [ps]: https://github.com/rust-lang/rust/pull/26884
9779 [rte]: https://github.com/rust-lang/rust/pull/26950
9780 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9781 [search]: https://github.com/rust-lang/rust/pull/26327
9782 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9783 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9784 [sh]: https://github.com/rust-lang/rust/pull/27280
9785 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9786 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9787 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9788 [st]: https://github.com/rust-lang/rust/pull/26630
9789 [win1]: https://github.com/rust-lang/rust/pull/26569
9790 [win2]: https://github.com/rust-lang/rust/pull/26741
9791 [win3]: https://github.com/rust-lang/rust/pull/26741
9792 [win4]: https://github.com/rust-lang/rust/pull/27210
9793 [xp]: https://github.com/rust-lang/rust/pull/26569
9795 Version 1.2.0 (2015-08-07)
9796 ==========================
9798 * ~1200 changes, numerous bugfixes
9803 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9804 like `Rc` to contain types without a fixed size, arrays and trait
9805 objects, finally enabling use of `Rc<[T]>` and completing the
9806 implementation of DST.
9807 * [Parallel codegen][parcodegen] is now working again, which can
9808 substantially speed up large builds in debug mode; It also gets
9809 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9810 jobs). It's not enabled by default, but will be "in the near
9811 future". It can be activated with the `-C codegen-units=N` flag to
9813 * This is the first release with [experimental support for linking
9814 with the MSVC linker and lib C on Windows (instead of using the GNU
9815 variants via MinGW)][win]. It is yet recommended only for the most
9816 intrepid Rustaceans.
9817 * Benchmark compilations are showing a 30% improvement in
9818 bootstrapping over 1.1.
9823 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9824 unicode case mapping, which is a previously-planned change in
9825 behavior and considered a bugfix.
9826 * [`mem::align_of`] now specifies [the *minimum alignment* for
9827 T][align], which is usually the alignment programs are interested
9828 in, and the same value reported by clang's
9829 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9831 * [The `#[packed]` attribute is no longer silently accepted by the
9832 compiler][packed]. This attribute did nothing and code that
9833 mentioned it likely did not work as intended.
9834 * Associated type defaults are [now behind the
9835 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9836 defaults *did not work*, but could be mentioned syntactically. As
9837 such this breakage has minimal impact.
9842 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9843 matching against dereferenceable values.
9848 * The [`Extend`] trait, which grows a collection from an iterator, is
9849 implemented over iterators of references, for `String`, `Vec`,
9850 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9851 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9852 * The [`iter::once`] function returns an iterator that yields a single
9853 element, and [`iter::empty`] returns an iterator that yields no
9855 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9856 over substring matches.
9857 * [`Cell`] and [`RefCell`] both implement `Eq`.
9858 * A number of methods for wrapping arithmetic are added to the
9859 integral types, [`wrapping_div`], [`wrapping_rem`],
9860 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9861 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9862 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9863 type.. It is illegal for the default arithmetic operations in Rust
9864 to overflow; the desire to wrap must be explicit.
9865 * The `{:#?}` formatting specifier [displays the alternate,
9866 pretty-printed][debugfmt] form of the `Debug` formatter. This
9867 feature was actually introduced prior to 1.0 with little
9869 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9870 for writing data to formatted strings, similar to [`io::Write`].
9871 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9872 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9873 are used by code generators to emit implementations of [`Debug`].
9874 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9875 methods that convert case, following Unicode case mapping.
9876 * It is now easier to handle poisoned locks. The [`PoisonError`]
9877 type, returned by failing lock operations, exposes `into_inner`,
9878 `get_ref`, and `get_mut`, which all give access to the inner lock
9879 guard, and allow the poisoned lock to continue to operate. The
9880 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9881 poisoned lock without attempting to take the lock.
9882 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9883 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9884 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9885 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9887 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9893 * `rustc` employs smarter heuristics for guessing at [typos].
9894 * `rustc` emits more efficient code for [no-op conversions between
9895 unsafe pointers][nop].
9896 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9897 resulting in faster compile times and smaller code.
9899 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9900 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9901 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9902 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9903 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9904 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9905 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9906 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9907 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9908 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9909 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9910 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9911 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9912 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9913 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9914 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9915 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9916 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9917 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9918 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9919 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9920 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9921 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9922 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9923 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9924 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9925 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9926 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9927 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9928 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9929 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9930 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9931 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9932 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9933 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9934 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9935 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9936 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9937 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9938 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9939 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9940 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9941 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9942 [align]: https://github.com/rust-lang/rust/pull/25646
9943 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9944 [typos]: https://github.com/rust-lang/rust/pull/26087
9945 [nop]: https://github.com/rust-lang/rust/pull/26336
9946 [fat]: https://github.com/rust-lang/rust/pull/26411
9947 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9948 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9949 [packed]: https://github.com/rust-lang/rust/pull/25541
9950 [ad]: https://github.com/rust-lang/rust/pull/27382
9951 [win]: https://github.com/rust-lang/rust/pull/25350
9953 Version 1.1.0 (2015-06-25)
9954 =========================
9956 * ~850 changes, numerous bugfixes
9961 * The [`std::fs` module has been expanded][fs] to expand the set of
9962 functionality exposed:
9963 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9964 don't incur a syscall on some platforms.
9965 * A `symlink_metadata` function has been added.
9966 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9967 access to all underlying information.
9968 * The compiler now contains extended explanations of many errors. When an error
9969 with an explanation occurs the compiler suggests using the `--explain` flag
9970 to read the explanation. Error explanations are also [available online][err-index].
9971 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9972 well as other work, the time to bootstrap the compiler decreased by
9978 * The [`str::split_whitespace`] method splits a string on unicode
9979 whitespace boundaries.
9980 * On both Windows and Unix, new extension traits provide conversion of
9981 I/O types to and from the underlying system handles. On Unix, these
9982 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9983 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9984 `TcpListener`, and `UpdSocket`. Further implementations for
9985 `std::process` will be stabilized later.
9986 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9987 Windows, symlinks can be created with
9988 `std::os::windows::symlink_dir` and
9989 `std::os::windows::symlink_file`.
9990 * The `mpsc::Receiver` type can now be converted into an iterator with
9991 `into_iter` on the [`IntoIterator`] trait.
9992 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9993 implementation of the [`From`] trait.
9994 * The `Debug` implementation for `RangeFull` [creates output that is
9995 more consistent with other implementations][rf].
9996 * [`Debug` is implemented for `File`][file].
9997 * The `Default` implementation for `Arc` [no longer requires `Sync +
9999 * [The `Iterator` methods `count`, `nth`, and `last` have been
10000 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
10001 * Incorrect handling of paths on Windows has been improved in both the
10002 compiler and the standard library.
10003 * [`AtomicPtr` gained a `Default` implementation][ap].
10004 * In accordance with Rust's policy on arithmetic overflow `abs` now
10005 [panics on overflow when debug assertions are enabled][abs].
10006 * The [`Cloned`] iterator, which was accidentally left unstable for
10007 1.0 [has been stabilized][c].
10008 * The [`Incoming`] iterator, which iterates over incoming TCP
10009 connections, and which was accidentally unnamable in 1.0, [is now
10010 properly exported][inc].
10011 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10012 `sift_up` or `sift_down` panic][bh].
10013 * The [`split_off`] method of `LinkedList` [no longer corrupts
10014 the list in certain scenarios][ll].
10019 * Type checking performance [has improved notably][sk] with
10020 [multiple improvements][pre].
10021 * The compiler [suggests code changes][ch] for more errors.
10022 * rustc and it's build system have experimental support for [building
10023 toolchains against MUSL][m] instead of glibc on Linux.
10024 * The compiler defines the `target_env` cfg value, which is used for
10025 distinguishing toolchains that are otherwise for the same
10026 platform. Presently this is set to `gnu` for common GNU Linux
10027 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10028 * The [`cargo rustc`][crc] command invokes a build with custom flags
10030 * [Android executables are always position independent][pie].
10031 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10032 with `Drop`][24935].
10034 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10035 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10036 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10037 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10038 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10039 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10040 [rf]: https://github.com/rust-lang/rust/pull/24491
10041 [err-index]: https://doc.rust-lang.org/error-index.html
10042 [sk]: https://github.com/rust-lang/rust/pull/24615
10043 [pre]: https://github.com/rust-lang/rust/pull/25323
10044 [file]: https://github.com/rust-lang/rust/pull/24598
10045 [ch]: https://github.com/rust-lang/rust/pull/24683
10046 [arc]: https://github.com/rust-lang/rust/pull/24695
10047 [si]: https://github.com/rust-lang/rust/pull/24701
10048 [ap]: https://github.com/rust-lang/rust/pull/24834
10049 [m]: https://github.com/rust-lang/rust/pull/24777
10050 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10051 [crc]: https://github.com/rust-lang/cargo/pull/1568
10052 [pie]: https://github.com/rust-lang/rust/pull/24953
10053 [abs]: https://github.com/rust-lang/rust/pull/25441
10054 [c]: https://github.com/rust-lang/rust/pull/25496
10055 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10056 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10057 [inc]: https://github.com/rust-lang/rust/pull/25522
10058 [bh]: https://github.com/rust-lang/rust/pull/25856
10059 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10060 [ll]: https://github.com/rust-lang/rust/pull/26022
10061 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10062 [24935]: https://github.com/rust-lang/rust/pull/24935
10064 Version 1.0.0 (2015-05-15)
10065 ========================
10067 * ~1500 changes, numerous bugfixes
10072 * The vast majority of the standard library is now `#[stable]`. It is
10073 no longer possible to use unstable features with a stable build of
10075 * Many popular crates on [crates.io] now work on the stable release
10077 * Arithmetic on basic integer types now [checks for overflow in debug
10083 * Several [restrictions have been added to trait coherence][coh] in
10084 order to make it easier for upstream authors to change traits
10085 without breaking downstream code.
10086 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10087 improve error messages and macro behavior. For example, `0b1234` is
10088 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10089 * Trait bounds [are always invariant][inv], eliminating the need for
10090 the `PhantomFn` and `MarkerTrait` lang items, which have been
10092 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10093 "foo" as bar` syntax has been replaced with `extern crate foo as
10094 bar`, and Cargo now automatically translates "-" in *package* names
10095 to underscore for the crate name.
10096 * [Lifetime shadowing is an error][lt].
10097 * [`Send` no longer implies `'static`][send-rfc].
10098 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10099 `MyType::default()`.
10100 * Primitive types [now have inherent methods][prim-inherent],
10101 obviating the need for extension traits like `SliceExt`.
10102 * Methods with `Self: Sized` in their `where` clause are [considered
10103 object-safe][self-sized], allowing many extension traits like
10104 `IteratorExt` to be merged into the traits they extended.
10105 * You can now [refer to associated types][assoc-where] whose
10106 corresponding trait bounds appear only in a `where` clause.
10107 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10108 like `Send` and `Sync` are now library-defined.
10109 * A [Reflect trait][reflect] was introduced, which means that
10110 downcasting via the `Any` trait is effectively limited to concrete
10111 types. This helps retain the potentially-important "parametricity"
10112 property: generic code cannot behave differently for different type
10113 arguments except in minor ways.
10114 * The `unsafe_destructor` feature is now deprecated in favor of the
10115 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10121 * The `thread_local` module [has been renamed to `std::thread`][th].
10122 * The methods of `IteratorExt` [have been moved to the `Iterator`
10123 trait itself][23300].
10124 * Several traits that implement Rust's conventions for type
10125 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10126 [centralized in the `std::convert` module][con].
10127 * The `FromError` trait [was removed in favor of `From`][fe].
10128 * The basic sleep function [has moved to
10129 `std::thread::sleep_ms`][slp].
10130 * The `splitn` function now takes an `n` parameter that represents the
10131 number of items yielded by the returned iterator [instead of the
10132 number of 'splits'][spl].
10133 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10134 * [Derived implementations of `PartialOrd` now order enums according
10135 to their explicitly-assigned discriminants][po].
10136 * [Methods for searching strings are generic over `Pattern`s][pat],
10137 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10139 * [In method resolution, object methods are resolved before inherent
10141 * [`String::from_str` has been deprecated in favor of the `From` impl,
10142 `String::from`][24517].
10143 * [`io::Error` implements `Sync`][ios].
10144 * [The `words` method on `&str` has been replaced with
10145 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10147 * The new path and IO modules are complete and `#[stable]`. This
10148 was the major library focus for this cycle.
10149 * The path API was [revised][path-normalize] to normalize `.`,
10150 adjusting the tradeoffs in favor of the most common usage.
10151 * A large number of remaining APIs in `std` were also stabilized
10152 during this cycle; about 75% of the non-deprecated API surface
10154 * The new [string pattern API][string-pattern] landed, which makes
10155 the string slice API much more internally consistent and flexible.
10156 * A new set of [generic conversion traits][conversion] replaced
10157 many existing ad hoc traits.
10158 * Generic numeric traits were [completely removed][num-traits]. This
10159 was made possible thanks to inherent methods for primitive types,
10160 and the removal gives maximal flexibility for designing a numeric
10161 hierarchy in the future.
10162 * The `Fn` traits are now related via [inheritance][fn-inherit]
10163 and provide ergonomic [blanket implementations][fn-blanket].
10164 * The `Index` and `IndexMut` traits were changed to
10165 [take the index by value][index-value], enabling code like
10166 `hash_map["string"]` to work.
10167 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10168 `Copy` data is known to be `Clone` as well.
10173 * Many errors now have extended explanations that can be accessed with
10174 the `--explain` flag to `rustc`.
10175 * Many new examples have been added to the standard library
10177 * rustdoc has received a number of improvements focused on completion
10179 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10180 * Much headway was made on ecosystem-wide CI, making it possible
10181 to [compare builds for breakage][ci-compare].
10184 [crates.io]: http://crates.io
10185 [clo]: https://github.com/rust-lang/rust/pull/24034
10186 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10187 [con]: https://github.com/rust-lang/rust/pull/23875
10188 [cr]: https://github.com/rust-lang/rust/pull/23419
10189 [fe]: https://github.com/rust-lang/rust/pull/23879
10190 [23300]: https://github.com/rust-lang/rust/pull/23300
10191 [inv]: https://github.com/rust-lang/rust/pull/23938
10192 [ios]: https://github.com/rust-lang/rust/pull/24133
10193 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10194 [lt]: https://github.com/rust-lang/rust/pull/24057
10195 [meth]: https://github.com/rust-lang/rust/pull/24056
10196 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10197 [po]: https://github.com/rust-lang/rust/pull/24270
10198 [24517]: https://github.com/rust-lang/rust/pull/24517
10199 [slp]: https://github.com/rust-lang/rust/pull/23949
10200 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10201 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10202 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10203 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10204 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10205 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10206 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10207 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10208 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10209 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10210 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10211 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10212 [reflect]: https://github.com/rust-lang/rust/pull/23712
10213 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10214 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10215 [index-value]: https://github.com/rust-lang/rust/pull/23601
10216 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10217 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10218 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10219 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10220 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10221 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10224 Version 1.0.0-alpha.2 (2015-02-20)
10225 =====================================
10227 * ~1300 changes, numerous bugfixes
10231 * The various I/O modules were [overhauled][io-rfc] to reduce
10232 unnecessary abstractions and provide better interoperation with
10233 the underlying platform. The old `io` module remains temporarily
10235 * The standard library now [participates in feature gating][feat],
10236 so use of unstable libraries now requires a `#![feature(...)]`
10237 attribute. The impact of this change is [described on the
10238 forum][feat-forum]. [RFC][feat-rfc].
10242 * `for` loops [now operate on the `IntoIterator` trait][into],
10243 which eliminates the need to call `.iter()`, etc. to iterate
10244 over collections. There are some new subtleties to remember
10245 though regarding what sort of iterators various types yield, in
10246 particular that `for foo in bar { }` yields values from a move
10247 iterator, destroying the original collection. [RFC][into-rfc].
10248 * Objects now have [default lifetime bounds][obj], so you don't
10249 have to write `Box<Trait+'static>` when you don't care about
10250 storing references. [RFC][obj-rfc].
10251 * In types that implement `Drop`, [lifetimes must outlive the
10252 value][drop]. This will soon make it possible to safely
10253 implement `Drop` for types where `#[unsafe_destructor]` is now
10254 required. Read the [gorgeous RFC][drop-rfc] for details.
10255 * The fully qualified <T as Trait>::X syntax lets you set the Self
10256 type for a trait method or associated type. [RFC][ufcs-rfc].
10257 * References to types that implement `Deref<U>` now [automatically
10258 coerce to references][deref] to the dereferenced type `U`,
10259 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10260 should eliminate many unsightly uses of `&*`, as when converting
10261 from references to vectors into references to
10262 slices. [RFC][deref-rfc].
10263 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10264 `|:|`) is obsolete and closure kind is inferred from context.
10265 * [`Self` is a keyword][Self].
10269 * The `Show` and `String` formatting traits [have been
10270 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10271 their related purposes. Automatically getting a string
10272 conversion to use with `format!("{:?}", something_to_debug)` is
10273 now written `#[derive(Debug)]`.
10274 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10275 OsStr}`, provide strings in platform-specific encodings for easier
10276 interop with system APIs. [RFC][osstr-rfc].
10277 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10278 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10279 creating raw pointers.
10283 * Certain long error messages of the form 'expected foo found bar'
10284 are now [split neatly across multiple
10285 lines][multiline]. Examples in the PR.
10286 * On Unix Rust can be [uninstalled][un] by running
10287 `/usr/local/lib/rustlib/uninstall.sh`.
10288 * The `#[rustc_on_unimplemented]` attribute, requiring the
10289 'on_unimplemented' feature, lets rustc [display custom error
10290 messages when a trait is expected to be implemented for a type
10295 * Rust is tested against a [LALR grammar][lalr], which parses
10296 almost all the Rust files that rustc does.
10298 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10299 [close]: https://github.com/rust-lang/rust/pull/21843
10300 [deref]: https://github.com/rust-lang/rust/pull/21351
10301 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10302 [drop]: https://github.com/rust-lang/rust/pull/21972
10303 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10304 [feat]: https://github.com/rust-lang/rust/pull/21248
10305 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10306 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10307 [fmt]: https://github.com/rust-lang/rust/pull/21457
10308 [into]: https://github.com/rust-lang/rust/pull/20790
10309 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10310 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10311 [lalr]: https://github.com/rust-lang/rust/pull/21452
10312 [multiline]: https://github.com/rust-lang/rust/pull/19870
10313 [obj]: https://github.com/rust-lang/rust/pull/22230
10314 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10315 [onun]: https://github.com/rust-lang/rust/pull/20889
10316 [osstr]: https://github.com/rust-lang/rust/pull/21488
10317 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10318 [Self]: https://github.com/rust-lang/rust/pull/22158
10319 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10320 [un]: https://github.com/rust-lang/rust/pull/22256
10323 Version 1.0.0-alpha (2015-01-09)
10324 ==================================
10326 * ~2400 changes, numerous bugfixes
10330 * The language itself is considered feature complete for 1.0,
10331 though there will be many usability improvements and bugfixes
10332 before the final release.
10333 * Nearly 50% of the public API surface of the standard library has
10334 been declared 'stable'. Those interfaces are unlikely to change
10336 * The long-running debate over integer types has been
10337 [settled][ints]: Rust will ship with types named `isize` and
10338 `usize`, rather than `int` and `uint`, for pointer-sized
10339 integers. Guidelines will be rolled out during the alpha cycle.
10340 * Most crates that are not `std` have been moved out of the Rust
10341 distribution into the Cargo ecosystem so they can evolve
10342 separately and don't need to be stabilized as quickly, including
10343 'time', 'getopts', 'num', 'regex', and 'term'.
10344 * Documentation continues to be expanded with more API coverage, more
10345 examples, and more in-depth explanations. The guides have been
10346 consolidated into [The Rust Programming Language][trpl].
10347 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10348 * All official Rust binary installers now come with [Cargo], the
10349 Rust package manager.
10353 * Closures have been [completely redesigned][unboxed] to be
10354 implemented in terms of traits, can now be used as generic type
10355 bounds and thus monomorphized and inlined, or via an opaque
10356 pointer (boxed) as in the old system. The new system is often
10357 referred to as 'unboxed' closures.
10358 * Traits now support [associated types][assoc], allowing families
10359 of related types to be defined together and used generically in
10361 * Enum variants are [namespaced by their type names][enum].
10362 * [`where` clauses][where] provide a more versatile and attractive
10363 syntax for specifying generic bounds, though the previous syntax
10365 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10367 * Rust [no longer has a runtime][rt] of any description, and only
10368 supports OS threads, not green threads.
10369 * At long last, Rust has been overhauled for 'dynamically-sized
10370 types' ([DST]), which integrates 'fat pointers' (object types,
10371 arrays, and `str`) more deeply into the type system, making it
10373 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10374 `..j` that produce range types and which, when combined with the
10375 `Index` operator and multidispatch, leads to a convenient slice
10376 notation, `[i..j]`.
10377 * The new range syntax revealed an ambiguity in the fixed-length
10378 array syntax, so now fixed length arrays [are written `[T;
10380 * The `Copy` trait is no longer implemented automatically. Unsafe
10381 pointers no longer implement `Sync` and `Send` so types
10382 containing them don't automatically either. `Sync` and `Send`
10383 are now 'unsafe traits' so one can "forcibly" implement them via
10384 `unsafe impl` if a type confirms to the requirements for them
10385 even though the internals do not (e.g. structs containing unsafe
10386 pointers like `Arc`). These changes are intended to prevent some
10387 footguns and are collectively known as [opt-in built-in
10388 traits][oibit] (though `Sync` and `Send` will soon become pure
10389 library types unknown to the compiler).
10390 * Operator traits now take their operands [by value][ops], and
10391 comparison traits can use multidispatch to compare one type
10392 against multiple other types, allowing e.g. `String` to be
10393 compared with `&str`.
10394 * `if let` and `while let` are no longer feature-gated.
10395 * Rust has adopted a more [uniform syntax for escaping unicode
10396 characters][unicode].
10397 * `macro_rules!` [has been declared stable][mac]. Though it is a
10398 flawed system it is sufficiently popular that it must be usable
10399 for 1.0. Effort has gone into [future-proofing][mac-future] it
10400 in ways that will allow other macro systems to be developed in
10401 parallel, and won't otherwise impact the evolution of the
10403 * The prelude has been [pared back significantly][prelude] such
10404 that it is the minimum necessary to support the most pervasive
10405 code patterns, and through [generalized where clauses][where]
10406 many of the prelude extension traits have been consolidated.
10407 * Rust's rudimentary reflection [has been removed][refl], as it
10408 incurred too much code generation for little benefit.
10409 * [Struct variants][structvars] are no longer feature-gated.
10410 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10411 known as 'higher-ranked trait bounds', this crucially allows
10412 unboxed closures to work.
10413 * Macros invocations surrounded by parens or square brackets and
10414 not terminated by a semicolon are [parsed as
10415 expressions][macros], which makes expressions like `vec![1i32,
10416 2, 3].len()` work as expected.
10417 * Trait objects now implement their traits automatically, and
10418 traits that can be coerced to objects now must be [object
10420 * Automatically deriving traits is now done with `#[derive(...)]`
10421 not `#[deriving(...)]` for [consistency with other naming
10422 conventions][derive].
10423 * Importing the containing module or enum at the same time as
10424 items or variants they contain is [now done with `self` instead
10425 of `mod`][self], as in use `foo::{self, bar}`
10426 * Glob imports are no longer feature-gated.
10427 * The `box` operator and `box` patterns have been feature-gated
10428 pending a redesign. For now unique boxes should be allocated
10429 like other containers, with `Box::new`.
10433 * A [series][coll1] of [efforts][coll2] to establish
10434 [conventions][coll3] for collections types has resulted in API
10435 improvements throughout the standard library.
10436 * New [APIs for error handling][err] provide ergonomic interop
10437 between error types, and [new conventions][err-conv] describe
10438 more clearly the recommended error handling strategies in Rust.
10439 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10440 it is easier to discuss failure in the context of error handling
10441 without making clarifications as to whether you are referring to
10442 the 'fail' macro or failure more generally.
10443 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10444 syscall when available.
10445 * The 'serialize' crate has been renamed 'rustc-serialize' and
10446 moved out of the distribution to Cargo. Although it is widely
10447 used now, it is expected to be superseded in the near future.
10448 * The `Show` formatter, typically implemented with
10449 `#[derive(Show)]` is [now requested with the `{:?}`
10450 specifier][show] and is intended for use by all types, for uses
10451 such as `println!` debugging. The new `String` formatter must be
10452 implemented by hand, uses the `{}` specifier, and is intended
10453 for full-fidelity conversions of things that can logically be
10454 represented as strings.
10458 * [Flexible target specification][flex] allows rustc's code
10459 generation to be configured to support otherwise-unsupported
10461 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10462 respective debuggers with Rust-appropriate pretty-printing.
10463 * The Windows installation of Rust is distributed with the
10464 MinGW components currently required to link binaries on that
10469 * Nullable enum optimizations have been extended to more types so
10470 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10471 space than the inner types themselves.
10472 * Work has begun on supporting AArch64.
10474 [Cargo]: https://crates.io
10475 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10476 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10477 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10478 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10479 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10480 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10481 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10482 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10483 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10484 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10485 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10486 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10487 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10488 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10489 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10490 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10491 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10492 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10493 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10494 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10495 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10496 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10497 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10498 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10499 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10500 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10501 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10502 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10503 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10504 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10505 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10506 [trpl]: https://doc.rust-lang.org/book/index.html
10507 [rbe]: http://rustbyexample.com/
10510 Version 0.12.0 (2014-10-09)
10511 =============================
10513 * ~1900 changes, numerous bugfixes
10517 * The introductory documentation (now called The Rust Guide) has
10518 been completely rewritten, as have a number of supplementary
10520 * Rust's package manager, Cargo, continues to improve and is
10521 sometimes considered to be quite awesome.
10522 * Many API's in `std` have been reviewed and updated for
10523 consistency with the in-development Rust coding
10524 guidelines. The standard library documentation tracks
10525 stabilization progress.
10526 * Minor libraries have been moved out-of-tree to the rust-lang org
10527 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10528 be installed with Cargo.
10529 * Lifetime elision allows lifetime annotations to be left off of
10530 function declarations in many common scenarios.
10531 * Rust now works on 64-bit Windows.
10534 * Indexing can be overloaded with the `Index` and `IndexMut`
10536 * The `if let` construct takes a branch only if the `let` pattern
10537 matches, currently behind the 'if_let' feature gate.
10538 * 'where clauses', a more flexible syntax for specifying trait
10539 bounds that is more aesthetic, have been added for traits and
10540 free functions. Where clauses will in the future make it
10541 possible to constrain associated types, which would be
10542 impossible with the existing syntax.
10543 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10544 the 'slicing_syntax' feature gate, and can be overloaded with
10545 the `Slice` or `SliceMut` traits.
10546 * The syntax for matching of sub-slices has been changed to use a
10547 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10548 consistency with other uses of `..` and to future-proof
10549 potential additional uses of the syntax.
10550 * The syntax for matching inclusive ranges in patterns has changed
10551 from `0..3` to `0...4` to be consistent with the exclusive range
10552 syntax for slicing.
10553 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10554 c]`) has been put behind the 'advanced_slice_patterns' feature
10555 gate and may be removed in the future.
10556 * Components of tuples and tuple structs can be extracted using
10557 the `value.0` syntax, currently behind the `tuple_indexing`
10559 * The `#[crate_id]` attribute is no longer supported; versioning
10560 is handled by the package manager.
10561 * Renaming crate imports are now written `extern crate foo as bar`
10562 instead of `extern crate bar = foo`.
10563 * Renaming use statements are now written `use foo as bar` instead
10564 of `use bar = foo`.
10565 * `let` and `match` bindings and argument names in macros are now
10567 * The new, more efficient, closure types ('unboxed closures') have
10568 been added under a feature gate, 'unboxed_closures'. These will
10569 soon replace the existing closure types, once higher-ranked
10570 trait lifetimes are added to the language.
10571 * `move` has been added as a keyword, for indicating closures
10572 that capture by value.
10573 * Mutation and assignment is no longer allowed in pattern guards.
10574 * Generic structs and enums can now have trait bounds.
10575 * The `Share` trait is now called `Sync` to free up the term
10576 'shared' to refer to 'shared reference' (the default reference
10578 * Dynamically-sized types have been mostly implemented,
10579 unifying the behavior of fat-pointer types with the rest of the
10581 * As part of dynamically-sized types, the `Sized` trait has been
10582 introduced, which qualifying types implement by default, and
10583 which type parameters expect by default. To specify that a type
10584 parameter does not need to be sized, write `<Sized? T>`. Most
10585 types are `Sized`, notable exceptions being unsized arrays
10586 (`[T]`) and trait types.
10587 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10588 * Lifetime bounds can now be applied to type parameters and object
10590 * The old, reference counted GC type, `Gc<T>` which was once
10591 denoted by the `@` sigil, has finally been removed. GC will be
10592 revisited in the future.
10595 * Library documentation has been improved for a number of modules.
10596 * Bit-vectors, collections::bitv has been modernized.
10597 * The url crate is deprecated in favor of
10598 http://github.com/servo/rust-url, which can be installed with
10600 * Most I/O stream types can be cloned and subsequently closed from
10601 a different thread.
10602 * A `std::time::Duration` type has been added for use in I/O
10603 methods that rely on timers, as well as in the 'time' crate's
10604 `Timespec` arithmetic.
10605 * The runtime I/O abstraction layer that enabled the green thread
10606 scheduler to do non-thread-blocking I/O has been removed, along
10607 with the libuv-based implementation employed by the green thread
10608 scheduler. This will greatly simplify the future I/O work.
10609 * `collections::btree` has been rewritten to have a more
10610 idiomatic and efficient design.
10613 * rustdoc output now indicates the stability levels of API's.
10614 * The `--crate-name` flag can specify the name of the crate
10615 being compiled, like `#[crate_name]`.
10616 * The `-C metadata` specifies additional metadata to hash into
10617 symbol names, and `-C extra-filename` specifies additional
10618 information to put into the output filename, for use by the
10619 package manager for versioning.
10620 * debug info generation has continued to improve and should be
10621 more reliable under both gdb and lldb.
10622 * rustc has experimental support for compiling in parallel
10623 using the `-C codegen-units` flag.
10624 * rustc no longer encodes rpath information into binaries by
10628 * Stack usage has been optimized with LLVM lifetime annotations.
10629 * Official Rust binaries on Linux are more compatible with older
10630 kernels and distributions, built on CentOS 5.10.
10633 Version 0.11.0 (2014-07-02)
10634 ==========================
10636 * ~1700 changes, numerous bugfixes
10639 * ~[T] has been removed from the language. This type is superseded by
10641 * ~str has been removed from the language. This type is superseded by
10643 * ~T has been removed from the language. This type is superseded by the
10645 * @T has been removed from the language. This type is superseded by the
10646 standard library's std::gc::Gc<T> type.
10647 * Struct fields are now all private by default.
10648 * Vector indices and shift amounts are both required to be a `uint`
10649 instead of any integral type.
10650 * Byte character, byte string, and raw byte string literals are now all
10651 supported by prefixing the normal literal with a `b`.
10652 * Multiple ABIs are no longer allowed in an ABI string
10653 * The syntax for lifetimes on closures/procedures has been tweaked
10654 slightly: `<'a>|A, B|: 'b + K -> T`
10655 * Floating point modulus has been removed from the language; however it
10656 is still provided by a library implementation.
10657 * Private enum variants are now disallowed.
10658 * The `priv` keyword has been removed from the language.
10659 * A closure can no longer be invoked through a &-pointer.
10660 * The `use foo, bar, baz;` syntax has been removed from the language.
10661 * The transmute intrinsic no longer works on type parameters.
10662 * Statics now allow blocks/items in their definition.
10663 * Trait bounds are separated from objects with + instead of : now.
10664 * Objects can no longer be read while they are mutably borrowed.
10665 * The address of a static is now marked as insignificant unless the
10666 #[inline(never)] attribute is placed it.
10667 * The #[unsafe_destructor] attribute is now behind a feature gate.
10668 * Struct literals are no longer allowed in ambiguous positions such as
10669 if, while, match, and for..in.
10670 * Declaration of lang items and intrinsics are now feature-gated by
10672 * Integral literals no longer default to `int`, and floating point
10673 literals no longer default to `f64`. Literals must be suffixed with an
10674 appropriate type if inference cannot determine the type of the
10676 * The Box<T> type is no longer implicitly borrowed to &mut T.
10677 * Procedures are now required to not capture borrowed references.
10680 * The standard library is now a "facade" over a number of underlying
10681 libraries. This means that development on the standard library should
10682 be speedier due to smaller crates, as well as a clearer line between
10684 * A new library, libcore, lives under the standard library's facade
10685 which is Rust's "0-assumption" library, suitable for embedded and
10686 kernel development for example.
10687 * A regex crate has been added to the standard distribution. This crate
10688 includes statically compiled regular expressions.
10689 * The unwrap/unwrap_err methods on Result require a Show bound for
10690 better error messages.
10691 * The return types of the std::comm primitives have been centralized
10692 around the Result type.
10693 * A number of I/O primitives have gained the ability to time out their
10695 * A number of I/O primitives have gained the ability to close their
10696 reading/writing halves to cancel pending operations.
10697 * Reverse iterator methods have been removed in favor of `rev()` on
10698 their forward-iteration counterparts.
10699 * A bitflags! macro has been added to enable easy interop with C and
10700 management of bit flags.
10701 * A debug_assert! macro is now provided which is disabled when
10702 `--cfg ndebug` is passed to the compiler.
10703 * A graphviz crate has been added for creating .dot files.
10704 * The std::cast module has been migrated into std::mem.
10705 * The std::local_data api has been migrated from freestanding functions
10706 to being based on methods.
10707 * The Pod trait has been renamed to Copy.
10708 * jemalloc has been added as the default allocator for types.
10709 * The API for allocating memory has been changed to use proper alignment
10710 and sized deallocation
10711 * Connecting a TcpStream or binding a TcpListener is now based on a
10712 string address and a u16 port. This allows connecting to a hostname as
10714 * The Reader trait now contains a core method, read_at_least(), which
10715 correctly handles many repeated 0-length reads.
10716 * The process-spawning API is now centered around a builder-style
10718 * The :? printing qualifier has been moved from the standard library to
10719 an external libdebug crate.
10720 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10721 have been renamed to Eq/Ord.
10722 * The select/plural methods have been removed from format!. The escapes
10723 for { and } have also changed from \{ and \} to {{ and }},
10725 * The TaskBuilder API has been re-worked to be a true builder, and
10726 extension traits for spawning native/green tasks have been added.
10729 * All breaking changes to the language or libraries now have their
10730 commit message annotated with `[breaking-change]` to allow for easy
10731 discovery of breaking changes.
10732 * The compiler will now try to suggest how to annotate lifetimes if a
10733 lifetime-related error occurs.
10734 * Debug info continues to be improved greatly with general bug fixes and
10735 better support for situations like link time optimization (LTO).
10736 * Usage of syntax extensions when cross-compiling has been fixed.
10737 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10738 -fdata-sections and --gc-sections has been enabled by default
10739 * The compiler is now stricter about where it will load module files
10740 from when a module is declared via `mod foo;`.
10741 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10742 Syntax extensions are now discovered via a "plugin registrar" type
10743 which will be extended in the future to other various plugins.
10744 * Lints have been restructured to allow for dynamically loadable lints.
10745 * A number of rustdoc improvements:
10746 * The HTML output has been visually redesigned.
10747 * Markdown is now powered by hoedown instead of sundown.
10748 * Searching heuristics have been greatly improved.
10749 * The search index has been reduced in size by a great amount.
10750 * Cross-crate documentation via `pub use` has been greatly improved.
10751 * Primitive types are now hyperlinked and documented.
10752 * Documentation has been moved from static.rust-lang.org/doc to
10754 * A new sandbox, play.rust-lang.org, is available for running and
10755 sharing rust code examples on-line.
10756 * Unused attributes are now more robustly warned about.
10757 * The dead_code lint now warns about unused struct fields.
10758 * Cross-compiling to iOS is now supported.
10759 * Cross-compiling to mipsel is now supported.
10760 * Stability attributes are now inherited by default and no longer apply
10761 to intra-crate usage, only inter-crate usage.
10762 * Error message related to non-exhaustive match expressions have been
10766 Version 0.10 (2014-04-03)
10767 =========================
10769 * ~1500 changes, numerous bugfixes
10772 * A new RFC process is now in place for modifying the language.
10773 * Patterns with `@`-pointers have been removed from the language.
10774 * Patterns with unique vectors (`~[T]`) have been removed from the
10776 * Patterns with unique strings (`~str`) have been removed from the
10778 * `@str` has been removed from the language.
10779 * `@[T]` has been removed from the language.
10780 * `@self` has been removed from the language.
10781 * `@Trait` has been removed from the language.
10782 * Headers on `~` allocations which contain `@` boxes inside the type for
10783 reference counting have been removed.
10784 * The semantics around the lifetimes of temporary expressions have changed,
10785 see #3511 and #11585 for more information.
10786 * Cross-crate syntax extensions are now possible, but feature gated. See
10787 #11151 for more information. This includes both `macro_rules!` macros as
10788 well as syntax extensions such as `format!`.
10789 * New lint modes have been added, and older ones have been turned on to be
10791 * Unnecessary parentheses
10792 * Uppercase statics
10794 * Uppercase variables
10795 * Publicly visible private types
10796 * `#[deriving]` with raw pointers
10797 * Unsafe functions can no longer be coerced to closures.
10798 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10799 * The `#[simd]` attribute is now behind a feature gate.
10800 * Visibility is no longer allowed on `extern crate` statements, and
10801 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10802 * Trailing commas are now allowed in argument lists and tuple patterns.
10803 * The `do` keyword has been removed, it is now a reserved keyword.
10804 * Default type parameters have been implemented, but are feature gated.
10805 * Borrowed variables through captures in closures are now considered soundly.
10806 * `extern mod` is now `extern crate`
10807 * The `Freeze` trait has been removed.
10808 * The `Share` trait has been added for types that can be shared among
10810 * Labels in macros are now hygienic.
10811 * Expression/statement macro invocations can be delimited with `{}` now.
10812 * Treatment of types allowed in `static mut` locations has been tweaked.
10813 * The `*` and `.` operators are now overloadable through the `Deref` and
10815 * `~Trait` and `proc` no longer have `Send` bounds by default.
10816 * Partial type hints are now supported with the `_` type marker.
10817 * An `Unsafe` type was introduced for interior mutability. It is now
10818 considered undefined to transmute from `&T` to `&mut T` without using the
10820 * The #[linkage] attribute was implemented for extern statics/functions.
10821 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10822 * `Pod` was renamed to `Copy`.
10825 * The `libextra` library has been removed. It has now been decomposed into
10826 component libraries with smaller and more focused nuggets of
10827 functionality. The full list of libraries can be found on the
10828 documentation index page.
10829 * std: `std::condition` has been removed. All I/O errors are now propagated
10830 through the `Result` type. In order to assist with error handling, a
10831 `try!` macro for unwrapping errors with an early return and a lint for
10832 unused results has been added. See #12039 for more information.
10833 * std: The `vec` module has been renamed to `slice`.
10834 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10835 This will become the only growable vector in the future.
10836 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10837 are now found at `std::io::BufferedReader` instead of
10838 `std::io::buffered::BufferedReader`.
10839 * std: `print` and `println` are no longer in the prelude, the `print!` and
10840 `println!` macros are intended to be used instead.
10841 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10842 attempts to statically prevent cycles.
10843 * std: The standard distribution is adopting the policy of pushing failure
10844 to the user rather than failing in libraries. Many functions (such as
10845 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10846 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10847 deriving mode: `#[deriving(Show)]`.
10848 * std: `ToStr` is now implemented for all types implementing `Show`.
10849 * std: The formatting trait methods now take `&self` instead of `&T`
10850 * std: The `invert()` method on iterators has been renamed to `rev()`
10851 * std: `std::num` has seen a reduction in the genericity of its traits,
10852 consolidating functionality into a few core traits.
10853 * std: Backtraces are now printed on task failure if the environment
10854 variable `RUST_BACKTRACE` is present.
10855 * std: Naming conventions for iterators have been standardized. More details
10856 can be found on the wiki's style guide.
10857 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10858 still implement the function.
10859 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10860 * std: `assert_approx_eq!` has been removed
10861 * std: The `e` and `E` formatting specifiers for floats have been added to
10862 print them in exponential notation.
10863 * std: The `Times` trait has been removed
10864 * std: Indications of variance and opting out of builtin bounds is done
10865 through marker types in `std::kinds::marker` now
10866 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10867 `#[deriving(Hash)]` is now possible.
10868 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10869 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10870 * std: `Chan::new` is now `channel()`.
10871 * std: A new synchronous channel type has been implemented.
10872 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10873 * std: `hashmap` and `trie` have been moved to `libcollections`
10874 * std: `run` has been rolled into `io::process`
10875 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10876 * std: The equality and comparison traits have seen some reorganization.
10877 * std: `rand` has moved to `librand`.
10878 * std: `to_{lower,upper}case` has been implemented for `char`.
10879 * std: Logging has been moved to `liblog`.
10880 * collections: `HashMap` has been rewritten for higher performance and less
10882 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10883 it can be booted manually. The runtime guide has more information and
10885 * native: All I/O functionality except signals has been implemented.
10886 * green: Task spawning with `libgreen` has been optimized with stack caching
10887 and various trimming of code.
10888 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10889 * sync: The `extra::sync` module has been updated to modern rust (and moved
10890 to the `sync` library), tweaking and improving various interfaces while
10891 dropping redundant functionality.
10892 * sync: A new `Barrier` type has been added to the `sync` library.
10893 * sync: An efficient mutex for native and green tasks has been implemented.
10894 * serialize: The `base64` module has seen some improvement. It treats
10895 newlines better, has non-string error values, and has seen general
10897 * fourcc: A `fourcc!` macro was introduced
10898 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10899 hexadecimal literal.
10902 * `rustpkg` has been deprecated and removed from the main repository. Its
10903 replacement, `cargo`, is under development.
10904 * Nightly builds of rust are now available
10905 * The memory usage of rustc has been improved many times throughout this
10907 * The build process supports disabling rpath support for the rustc binary
10909 * Code generation has improved in some cases, giving more information to the
10910 LLVM optimization passes to enable more extensive optimizations.
10911 * Debuginfo compatibility with lldb on OSX has been restored.
10912 * The master branch is now gated on an android bot, making building for
10913 android much more reliable.
10914 * Output flags have been centralized into one `--emit` flag.
10915 * Crate type flags have been centralized into one `--crate-type` flag.
10916 * Codegen flags have been consolidated behind a `-C` flag.
10917 * Linking against outdated crates now has improved error messages.
10918 * Error messages with lifetimes will often suggest how to annotate the
10919 function to fix the error.
10920 * Many more types are documented in the standard library, and new guides
10922 * Many `rustdoc` improvements:
10923 * code blocks are syntax highlighted.
10924 * render standalone markdown files.
10925 * the --test flag tests all code blocks by default.
10926 * exported macros are displayed.
10927 * re-exported types have their documentation inlined at the location of the
10929 * search works across crates that have been rendered to the same output
10933 Version 0.9 (2014-01-09)
10934 ==========================
10936 * ~1800 changes, numerous bugfixes
10939 * The `float` type has been removed. Use `f32` or `f64` instead.
10940 * A new facility for enabling experimental features (feature gating) has
10941 been added, using the crate-level `#[feature(foo)]` attribute.
10942 * Managed boxes (@) are now behind a feature gate
10943 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10944 standard library's `Gc` or `Rc` types instead.
10945 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10946 * Jumping back to the top of a loop is now done with `continue` instead of
10948 * Strings can no longer be mutated through index assignment.
10949 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10950 hash delimiters, as in `r###"foo"###`.
10951 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10953 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10954 * `@fn`s have been removed.
10955 * `do` only works with procs in order to make it obvious what the cost
10957 * Single-element tuple-like structs can no longer be dereferenced to
10958 obtain the inner value. A more comprehensive solution for overloading
10959 the dereference operator will be provided in the future.
10960 * The `#[link(...)]` attribute has been replaced with
10961 `#[crate_id = "name#vers"]`.
10962 * Empty `impl`s must be terminated with empty braces and may not be
10963 terminated with a semicolon.
10964 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10965 no longer has any special meaning.
10966 * The old `fmt!` string formatting macro has been removed.
10967 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10968 `print!` and `println!`.
10969 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10970 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10971 `extern mod foo = "bar"` instead.
10972 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10973 * Macros can have attributes.
10974 * Macros can expand to items with attributes.
10975 * Macros can expand to multiple items.
10976 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10977 * Comments may be nested.
10978 * Values automatically coerce to trait objects they implement, without
10980 * Enum discriminants are no longer an entire word but as small as needed to
10981 contain all the variants. The `repr` attribute can be used to override
10982 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10983 `#[repr(C)]` to match C enums.
10984 * Non-string literals are not allowed in attributes (they never worked).
10985 * The FFI now supports variadic functions.
10986 * Octal numeric literals, as in `0o7777`.
10987 * The `concat!` syntax extension performs compile-time string concatenation.
10988 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10989 removed as Rust no longer uses segmented stacks.
10990 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10991 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10992 not `*`; ignoring remaining fields of a struct is also done with `..`,
10993 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10994 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10995 * `rustc` supports the "system" calling convention, which defaults to the
10996 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10998 * The `type_overflow` lint (default: warn) checks literals for overflow.
10999 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
11000 * The `attribute_usage` lint (default: warn) warns about unknown
11002 * The `unknown_features` lint (default: warn) warns about unknown
11004 * The `dead_code` lint (default: warn) checks for dead code.
11005 * Rust libraries can be linked statically to one another
11006 * `#[link_args]` is behind the `link_args` feature gate.
11007 * Native libraries are now linked with `#[link(name = "foo")]`
11008 * Native libraries can be statically linked to a rust crate
11009 (`#[link(name = "foo", kind = "static")]`).
11010 * Native OS X frameworks are now officially supported
11011 (`#[link(name = "foo", kind = "framework")]`).
11012 * The `#[thread_local]` attribute creates thread-local (not task-local)
11013 variables. Currently behind the `thread_local` feature gate.
11014 * The `return` keyword may be used in closures.
11015 * Types that can be copied via a memcpy implement the `Pod` kind.
11016 * The `cfg` attribute can now be used on struct fields and enum variants.
11019 * std: The `option` and `result` API's have been overhauled to make them
11020 simpler, more consistent, and more composable.
11021 * std: The entire `std::io` module has been replaced with one that is
11022 more comprehensive and that properly interfaces with the underlying
11023 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11025 * std: `io::util` contains a number of useful implementations of
11026 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11027 `ZeroReader`, `TeeReader`.
11028 * std: The reference counted pointer type `extra::rc` moved into std.
11029 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11030 just a wrapper around it).
11031 * std: The `Either` type has been removed.
11032 * std: `fmt::Default` can be implemented for any type to provide default
11033 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11034 * std: The `rand` API continues to be tweaked.
11035 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11036 on failure in gdb, is now named `rust_fail`.
11037 * std: The `each_key` and `each_value` methods on `HashMap` have been
11038 replaced by the `keys` and `values` iterators.
11039 * std: Functions dealing with type size and alignment have moved from the
11040 `sys` module to the `mem` module.
11041 * std: The `path` module was written and API changed.
11042 * std: `str::from_utf8` has been changed to cast instead of allocate.
11043 * std: `starts_with` and `ends_with` methods added to vectors via the
11044 `ImmutableEqVector` trait, which is in the prelude.
11045 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11046 if the index is out of bounds.
11047 * std: Task failure no longer propagates between tasks, as the model was
11048 complex, expensive, and incompatible with thread-based tasks.
11049 * std: The `Any` type can be used for dynamic typing.
11050 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11052 * std: Methods that produce iterators generally do not have an `_iter`
11054 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11055 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11056 * std: `util::ignore` renamed to `prelude::drop`.
11057 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11059 * std: `vec::raw` has seen a lot of cleanup and API changes.
11060 * std: The standard library no longer includes any C++ code, and very
11061 minimal C, eliminating the dependency on libstdc++.
11062 * std: Runtime scheduling and I/O functionality has been factored out into
11063 extensible interfaces and is now implemented by two different crates:
11064 libnative, for native threading and I/O; and libgreen, for green threading
11065 and I/O. This paves the way for using the standard library in more limited
11066 embedded environments.
11067 * std: The `comm` module has been rewritten to be much faster, have a
11068 simpler, more consistent API, and to work for both native and green
11070 * std: All libuv dependencies have been moved into the rustuv crate.
11071 * native: New implementations of runtime scheduling on top of OS threads.
11072 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11074 * green: The green thread scheduler and message passing types are almost
11075 entirely lock-free.
11076 * extra: The `flatpipes` module had bitrotted and was removed.
11077 * extra: All crypto functions have been removed and Rust now has a policy of
11078 not reimplementing crypto in the standard library. In the future crypto
11079 will be provided by external crates with bindings to established libraries.
11080 * extra: `c_vec` has been modernized.
11081 * extra: The `sort` module has been removed. Use the `sort` method on
11085 * The `rust` and `rusti` commands have been removed, due to lack of
11087 * `rustdoc` was completely rewritten.
11088 * `rustdoc` can test code examples in documentation.
11089 * `rustpkg` can test packages with the argument, 'test'.
11090 * `rustpkg` supports arbitrary dependencies, including C libraries.
11091 * `rustc`'s support for generating debug info is improved again.
11092 * `rustc` has better error reporting for unbalanced delimiters.
11093 * `rustc`'s JIT support was removed due to bitrot.
11094 * Executables and static libraries can be built with LTO (-Z lto)
11095 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11099 Version 0.8 (2013-09-26)
11100 ============================
11102 * ~2200 changes, numerous bugfixes
11105 * The `for` loop syntax has changed to work with the `Iterator` trait.
11106 * At long last, unwinding works on Windows.
11107 * Default methods are ready for use.
11108 * Many trait inheritance bugs fixed.
11109 * Owned and borrowed trait objects work more reliably.
11110 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11111 * rustc can omit emission of code for the `debug!` macro if it is passed
11113 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11114 for foo.rs, then foo/mod.rs, and will generate an error when both are
11116 * Strings no longer contain trailing nulls. The new `std::c_str` module
11117 provides new mechanisms for converting to C strings.
11118 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11119 * The FFI has been overhauled such that foreign functions are called directly,
11120 instead of through a stack-switching wrapper.
11121 * Calling a foreign function must be done through a Rust function with the
11122 `#[fixed_stack_segment]` attribute.
11123 * The `externfn!` macro can be used to declare both a foreign function and
11124 a `#[fixed_stack_segment]` wrapper at once.
11125 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11126 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11127 * `priv` is disallowed everywhere except for struct fields and enum variants.
11128 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11129 * `ref` bindings in irrefutable patterns work correctly now.
11130 * `char` is now prevented from containing invalid code points.
11131 * Casting to `bool` is no longer allowed.
11132 * `\0` is now accepted as an escape in chars and strings.
11133 * `yield` is a reserved keyword.
11134 * `typeof` is a reserved keyword.
11135 * Crates may be imported by URL with `extern mod foo = "url";`.
11136 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11137 * Static vectors can be initialized with repeating elements,
11138 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11139 * Static structs can be initialized with functional record update,
11140 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11141 * `cfg!` can be used to conditionally execute code based on the crate
11142 configuration, similarly to `#[cfg(...)]`.
11143 * The `unnecessary_qualification` lint detects unneeded module
11144 prefixes (default: allow).
11145 * Arithmetic operations have been implemented on the SIMD types in
11146 `std::unstable::simd`.
11147 * Exchange allocation headers were removed, reducing memory usage.
11148 * `format!` implements a completely new, extensible, and higher-performance
11149 string formatting system. It will replace `fmt!`.
11150 * `print!` and `println!` write formatted strings (using the `format!`
11151 extension) to stdout.
11152 * `write!` and `writeln!` write formatted strings (using the `format!`
11153 extension) to the new Writers in `std::rt::io`.
11154 * The library section in which a function or static is placed may
11155 be specified with `#[link_section = "..."]`.
11156 * The `proto!` syntax extension for defining bounded message protocols
11158 * `macro_rules!` is hygienic for `let` declarations.
11159 * The `#[export_name]` attribute specifies the name of a symbol.
11160 * `unreachable!` can be used to indicate unreachable code, and fails
11164 * std: Transitioned to the new runtime, written in Rust.
11165 * std: Added an experimental I/O library, `rt::io`, based on the new
11167 * std: A new generic `range` function was added to the prelude, replacing
11168 `uint::range` and friends.
11169 * std: `range_rev` no longer exists. Since range is an iterator it can be
11170 reversed with `range(lo, hi).invert()`.
11171 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11172 renamed to `unwrap_or`.
11173 * std: The `iterator` module was renamed to `iter`.
11174 * std: Integral types now support the `checked_add`, `checked_sub`, and
11175 `checked_mul` operations for detecting overflow.
11176 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11178 * std: Methods are standardizing on conventions for casting methods:
11179 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11181 * std: The `CString` type in `c_str` provides new ways to convert to and
11183 * std: `DoubleEndedIterator` can yield elements in two directions.
11184 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11186 * std: `str::from_bytes` renamed to `str::from_utf8`.
11187 * std: `pop_opt` and `shift_opt` methods added to vectors.
11188 * std: The task-local data interface no longer uses @, and keys are
11189 no longer function pointers.
11190 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11191 * std: Added `SharedPort` to `comm`.
11192 * std: `Eq` has a default method for `ne`; only `eq` is required
11193 in implementations.
11194 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11195 is required in implementations.
11196 * std: `is_utf8` performance is improved, impacting many string functions.
11197 * std: `os::MemoryMap` provides cross-platform mmap.
11198 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11199 are not 'in-bounds' are considered undefined.
11200 * std: Many freestanding functions in `vec` removed in favor of methods.
11201 * std: Many freestanding functions on scalar types removed in favor of
11203 * std: Many options to task builders were removed since they don't make
11204 sense in the new scheduler design.
11205 * std: More containers implement `FromIterator` so can be created by the
11207 * std: More complete atomic types in `unstable::atomics`.
11208 * std: `comm::PortSet` removed.
11209 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11210 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11211 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11212 default implementations.
11213 * std: Various `from_str` functions were removed in favor of a generic
11214 `from_str` which is available in the prelude.
11215 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11216 * extra: `dlist`, the doubly-linked list was modernized.
11217 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11218 * extra: Added `glob` module, replacing `std::os::glob`.
11219 * extra: `rope` was removed.
11220 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11221 * extra: `net`, and `timer` were removed. The experimental replacements
11222 are `std::rt::io::net` and `std::rt::io::timer`.
11223 * extra: Iterators implemented for `SmallIntMap`.
11224 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11225 * extra: `SmallIntSet` removed. Use `BitvSet`.
11226 * extra: Performance of JSON parsing greatly improved.
11227 * extra: `semver` updated to SemVer 2.0.0.
11228 * extra: `term` handles more terminals correctly.
11229 * extra: `dbg` module removed.
11230 * extra: `par` module removed.
11231 * extra: `future` was cleaned up, with some method renames.
11232 * extra: Most free functions in `getopts` were converted to methods.
11235 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11236 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11237 similarly to gcc's `--march` flag.
11238 * rustc's performance compiling small crates is much better.
11239 * rustpkg has received many improvements.
11240 * rustpkg supports git tags as package IDs.
11241 * rustpkg builds into target-specific directories so it can be used for
11243 * The number of concurrent test tasks is controlled by the environment
11244 variable RUST_TEST_TASKS.
11245 * The test harness can now report metrics for benchmarks.
11246 * All tools have man pages.
11247 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11248 * The runtime uses jemalloc for allocations.
11249 * Segmented stacks are temporarily disabled as part of the transition to
11250 the new runtime. Stack overflows are possible!
11251 * A new documentation backend, rustdoc_ng, is available for use. It is
11252 still invoked through the normal `rustdoc` command.
11255 Version 0.7 (2013-07-03)
11256 =======================
11258 * ~2000 changes, numerous bugfixes
11261 * `impl`s no longer accept a visibility qualifier. Put them on methods
11263 * The borrow checker has been rewritten with flow-sensitivity, fixing
11264 many bugs and inconveniences.
11265 * The `self` parameter no longer implicitly means `&'self self`,
11266 and can be explicitly marked with a lifetime.
11267 * Overloadable compound operators (`+=`, etc.) have been temporarily
11268 removed due to bugs.
11269 * The `for` loop protocol now requires `for`-iterators to return `bool`
11270 so they compose better.
11271 * The `Durable` trait is replaced with the `'static` bounds.
11272 * Trait default methods work more often.
11273 * Structs with the `#[packed]` attribute have byte alignment and
11274 no padding between fields.
11275 * Type parameters bound by `Copy` must now be copied explicitly with
11276 the `copy` keyword.
11277 * It is now illegal to move out of a dereferenced unsafe pointer.
11278 * `Option<~T>` is now represented as a nullable pointer.
11279 * `@mut` does dynamic borrow checks correctly.
11280 * The `main` function is only detected at the topmost level of the crate.
11281 The `#[main]` attribute is still valid anywhere.
11282 * Struct fields may no longer be mutable. Use inherited mutability.
11283 * The `#[no_send]` attribute makes a type that would otherwise be
11285 * The `#[no_freeze]` attribute makes a type that would otherwise be
11287 * Unbounded recursion will abort the process after reaching the limit
11288 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11289 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11290 are never implicitly copyable.
11291 * `#[static_assert]` makes compile-time assertions about static bools.
11292 * At long last, 'argument modes' no longer exist.
11293 * The rarely used `use mod` statement no longer exists.
11295 * Syntax extensions
11296 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11298 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11299 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11300 `#[deriving(...)]`.
11301 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11302 and unsuffixed integer literals.
11305 * The `core` crate was renamed to `std`.
11306 * The `std` crate was renamed to `extra`.
11307 * More and improved documentation.
11308 * std: `iterator` module for external iterator objects.
11309 * Many old-style (internal, higher-order function) iterators replaced by
11310 implementations of `Iterator`.
11311 * std: Many old internal vector and string iterators,
11312 incl. `any`, `all`. removed.
11313 * std: The `finalize` method of `Drop` renamed to `drop`.
11314 * std: The `drop` method now takes `&mut self` instead of `&self`.
11315 * std: The prelude no longer re-exports any modules, only types and traits.
11316 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11317 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11318 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11319 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11320 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11321 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11322 * std: Many types implement `Clone`.
11323 * std: `path` type renamed to `Path`.
11324 * std: `mut` module and `Mut` type removed.
11325 * std: Many standalone functions removed in favor of methods and iterators
11326 in `vec`, `str`. In the future methods will also work as functions.
11327 * std: `reinterpret_cast` removed. Use `transmute`.
11328 * std: ascii string handling in `std::ascii`.
11329 * std: `Rand` is implemented for ~/@.
11330 * std: `run` module for spawning processes overhauled.
11331 * std: Various atomic types added to `unstable::atomic`.
11332 * std: Various types implement `Zero`.
11333 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11334 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11335 * std: Added `os::mkdir_recursive`.
11336 * std: Added `os::glob` function performs filesystems globs.
11337 * std: `FuzzyEq` renamed to `ApproxEq`.
11338 * std: `Map` now defines `pop` and `swap` methods.
11339 * std: `Cell` constructors converted to static methods.
11340 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11341 * extra: `flate` module moved from `std` to `extra`.
11342 * extra: `fileinput` module for iterating over a series of files.
11343 * extra: `Complex` number type and `complex` module.
11344 * extra: `Rational` number type and `rational` module.
11345 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11346 * extra: `term` uses terminfo now, is more correct.
11347 * extra: `arc` functions converted to methods.
11348 * extra: Implementation of fixed output size variations of SHA-2.
11351 * `unused_variables` lint mode for unused variables (default: warn).
11352 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11354 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11356 * `dead_assignment` lint mode for unread variables (default: warn).
11357 * `unnecessary_allocation` lint mode detects some heap allocations that are
11358 immediately borrowed so could be written without allocating (default: warn).
11359 * `missing_doc` lint mode (default: allow).
11360 * `unreachable_code` lint mode (default: warn).
11361 * The `rusti` command has been rewritten and a number of bugs addressed.
11362 * rustc outputs in color on more terminals.
11363 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11364 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11365 * Compiling with `-g` will make the binary record information about
11366 dynamic borrowcheck failures for debugging.
11367 * rustdoc has a nicer stylesheet.
11368 * Various improvements to rustdoc.
11369 * Improvements to rustpkg (see the detailed release notes).
11372 Version 0.6 (2013-04-03)
11373 ========================
11375 * ~2100 changes, numerous bugfixes
11378 * The self type parameter in traits is now spelled `Self`
11379 * The `self` parameter in trait and impl methods must now be explicitly
11380 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11381 * Static methods no longer require the `static` keyword and instead
11382 are distinguished by the lack of a `self` parameter
11383 * Replaced the `Durable` trait with the `'static` lifetime
11384 * The old closure type syntax with the trailing sigil has been
11385 removed in favor of the more consistent leading sigil
11386 * `super` is a keyword, and may be prefixed to paths
11387 * Trait bounds are separated with `+` instead of whitespace
11388 * Traits are implemented with `impl Trait for Type`
11389 instead of `impl Type: Trait`
11390 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11391 * The `export` keyword has finally been removed
11392 * The `move` keyword has been removed (see "Semantic changes")
11393 * The interior mutability qualifier on vectors, `[mut T]`, has been
11394 removed. Use `&mut [T]`, etc.
11395 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11396 * `fail` is no longer a keyword. Use `fail!()`
11397 * `assert` is no longer a keyword. Use `assert!()`
11398 * `log` is no longer a keyword. use `debug!`, etc.
11399 * 1-tuples may be represented as `(T,)`
11400 * Struct fields may no longer be `mut`. Use inherited mutability,
11401 `@mut T`, `core::mut` or `core::cell`
11402 * `extern mod { ... }` is no longer valid syntax for foreign
11403 function modules. Use extern blocks: `extern { ... }`
11404 * Newtype enums removed. Use tuple-structs.
11405 * Trait implementations no longer support visibility modifiers
11406 * Pattern matching over vectors improved and expanded
11407 * `const` renamed to `static` to correspond to lifetime name,
11408 and make room for future `static mut` unsafe mutable globals.
11409 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11410 * `Clone` implementations can be automatically generated with
11411 `#[deriving(Clone)]`
11412 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11413 instead of `foo as Bar`.
11414 * Fixed length vector types are now written as `[int, .. 3]`
11415 instead of `[int * 3]`.
11416 * Fixed length vector types can express the length as a constant
11417 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11420 * Types with owned pointers or custom destructors move by default,
11421 eliminating the `move` keyword
11422 * All foreign functions are considered unsafe
11423 * &mut is now unaliasable
11424 * Writes to borrowed @mut pointers are prevented dynamically
11426 * The name of the main function can be customized using #[main]
11427 * The default type of an inferred closure is &fn instead of @fn
11428 * `use` statements may no longer be "chained" - they cannot import
11429 identifiers imported by previous `use` statements
11430 * `use` statements are crate relative, importing from the "top"
11431 of the crate by default. Paths may be prefixed with `super::`
11432 or `self::` to change the search behavior.
11433 * Method visibility is inherited from the implementation declaration
11434 * Structural records have been removed
11435 * Many more types can be used in static items, including enums
11436 'static-lifetime pointers and vectors
11437 * Pattern matching over vectors improved and expanded
11438 * Typechecking of closure types has been overhauled to
11439 improve inference and eliminate unsoundness
11440 * Macros leave scope at the end of modules, unless that module is
11441 tagged with #[macro_escape]
11444 * Added big integers to `std::bigint`
11445 * Removed `core::oldcomm` module
11446 * Added pipe-based `core::comm` module
11447 * Numeric traits have been reorganized under `core::num`
11448 * `vec::slice` finally returns a slice
11449 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11450 * Containers reorganized around traits in `core::container`
11451 * `core::dvec` removed, `~[T]` is a drop-in replacement
11452 * `core::send_map` renamed to `core::hashmap`
11453 * `std::map` removed; replaced with `core::hashmap`
11454 * `std::treemap` reimplemented as an owned balanced tree
11455 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11456 * `core::trie` added as a fast ordered map for integer keys
11457 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11458 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11459 overload the comparison operators, whereas `TotalOrd` is used
11460 by certain container types
11463 * Replaced the 'cargo' package manager with 'rustpkg'
11464 * Added all-purpose 'rust' tool
11465 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11466 * rustc now *attempts* to offer spelling suggestions
11467 * Improved support for ARM and Android
11468 * Preliminary MIPS backend
11469 * Improved foreign function ABI implementation for x86, x86_64
11470 * Various memory usage improvements
11471 * Rust code may be embedded in foreign code under limited circumstances
11472 * Inline assembler supported by new asm!() syntax extension.
11475 Version 0.5 (2012-12-21)
11476 ===========================
11478 * ~900 changes, numerous bugfixes
11481 * Removed `<-` move operator
11482 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11483 * Removed old fixed length vector syntax - `[T]/N`
11484 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11485 * Macros may now expand to items and statements
11486 * `a.b()` is always parsed as a method call, never as a field projection
11487 * `Eq` and `IterBytes` implementations can be automatically generated
11488 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11489 * Removed the special crate language for `.rc` files
11490 * Function arguments may consist of any irrefutable pattern
11493 * `&` and `~` pointers may point to objects
11494 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11495 * Enum variants may be structs
11496 * Destructors can be added to all nominal types with the Drop trait
11497 * Structs and nullary enum variants may be constants
11498 * Values that cannot be implicitly copied are now automatically moved
11499 without writing `move` explicitly
11500 * `&T` may now be coerced to `*T`
11501 * Coercions happen in `let` statements as well as function calls
11502 * `use` statements now take crate-relative paths
11503 * The module and type namespaces have been merged so that static
11504 method names can be resolved under the trait in which they are
11507 * Improved support for language features
11508 * Trait inheritance works in many scenarios
11509 * More support for explicit self arguments in methods - `self`, `&self`
11510 `@self`, and `~self` all generally work as expected
11511 * Static methods work in more situations
11512 * Experimental: Traits may declare default methods for the implementations
11516 * New condition handling system in `core::condition`
11517 * Timsort added to `std::sort`
11518 * New priority queue, `std::priority_queue`
11519 * Pipes for serializable types, `std::flatpipes'
11520 * Serialization overhauled to be trait-based
11521 * Expanded `getopts` definitions
11522 * Moved futures to `std`
11523 * More functions are pure now
11524 * `core::comm` renamed to `oldcomm`. Still deprecated
11525 * `rustdoc` and `cargo` are libraries now
11528 * Added a preliminary REPL, `rusti`
11529 * License changed from MIT to dual MIT/APL2
11532 Version 0.4 (2012-10-15)
11533 ==========================
11535 * ~2000 changes, numerous bugfixes
11538 * All keywords are now strict and may not be used as identifiers anywhere
11539 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11540 'of', 'with', 'to', 'class'.
11541 * Classes are replaced with simpler structs
11542 * Explicit method self types
11543 * `ret` became `return` and `alt` became `match`
11544 * `import` is now `use`; `use is now `extern mod`
11545 * `extern mod { ... }` is now `extern { ... }`
11546 * `use mod` is the recommended way to import modules
11547 * `pub` and `priv` replace deprecated export lists
11548 * The syntax of `match` pattern arms now uses fat arrow (=>)
11549 * `main` no longer accepts an args vector; use `os::args` instead
11552 * Trait implementations are now coherent, ala Haskell typeclasses
11553 * Trait methods may be static
11554 * Argument modes are deprecated
11555 * Borrowed pointers are much more mature and recommended for use
11556 * Strings and vectors in the static region are stored in constant memory
11557 * Typestate was removed
11558 * Resolution rewritten to be more reliable
11559 * Support for 'dual-mode' data structures (freezing and thawing)
11562 * Most binary operators can now be overloaded via the traits in
11564 * `std::net::url` for representing URLs
11565 * Sendable hash maps in `core::send_map`
11566 * `core::task' gained a (currently unsafe) task-local storage API
11569 * An efficient new intertask communication primitive called the pipe,
11570 along with a number of higher-level channel types, in `core::pipes`
11571 * `std::arc`, an atomically reference counted, immutable, shared memory
11573 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11574 * Futures are now based on pipes and sendable
11575 * More robust linked task failure
11576 * Improved task builder API
11579 * Improved error reporting
11580 * Preliminary JIT support
11581 * Preliminary work on precise GC
11582 * Extensive architectural improvements to rustc
11583 * Begun a transition away from buggy C++-based reflection (shape) code to
11584 Rust-based (visitor) code
11585 * All hash functions and tables converted to secure, randomized SipHash
11588 Version 0.3 (2012-07-12)
11589 ========================
11591 * ~1900 changes, numerous bugfixes
11593 * New coding conveniences
11594 * Integer-literal suffix inference
11595 * Per-item control over warnings, errors
11596 * #[cfg(windows)] and #[cfg(unix)] attributes
11597 * Documentation comments
11598 * More compact closure syntax
11599 * 'do' expressions for treating higher-order functions as
11601 * *-patterns (wildcard extended to all constructor fields)
11604 * Name resolution pass and exhaustiveness checker rewritten
11605 * Region pointers and borrow checking supersede alias
11607 * Init-ness checking is now provided by a region-based liveness
11608 pass instead of the typestate pass; same for last-use analysis
11609 * Extensive work on region pointers
11611 * Experimental new language features
11612 * Slices and fixed-size, interior-allocated vectors
11613 * #!-comments for lang versioning, shell execution
11614 * Destructors and iface implementation for classes;
11615 type-parameterized classes and class methods
11616 * 'const' type kind for types that can be used to implement
11617 shared-memory concurrency patterns
11621 * Removal of various obsolete features
11622 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11623 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11625 * Constructs: do-while loops ('do' repurposed), fn binding,
11626 resources (replaced by destructors)
11628 * Compiler reorganization
11629 * Syntax-layer of compiler split into separate crate
11630 * Clang (from LLVM project) integrated into build
11631 * Typechecker split into sub-modules
11634 * New time functions
11635 * Extension methods for many built-in types
11636 * Arc: atomic-refcount read-only / exclusive-use shared cells
11637 * Par: parallel map and search routines
11638 * Extensive work on libuv interface
11639 * Much vector code moved to libraries
11640 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11641 #include, #include_str, #include_bin
11643 * Tool improvements
11644 * Cargo automatically resolves dependencies
11647 Version 0.2 (2012-03-29)
11648 =========================
11650 * >1500 changes, numerous bugfixes
11652 * New docs and doc tooling
11654 * New port: FreeBSD x86_64
11656 * Compilation model enhancements
11657 * Generics now specialized, multiply instantiated
11658 * Functions now inlined across separate crates
11660 * Scheduling, stack and threading fixes
11661 * Noticeably improved message-passing performance
11662 * Explicit schedulers
11666 * Experimental new language features
11667 * Operator overloading
11671 * Various language extensions
11672 * C-callback function types: 'crust fn ...'
11673 * Infinite-loop construct: 'loop { ... }'
11674 * Shorten 'mutable' to 'mut'
11675 * Required mutable-local qualifier: 'let mut ...'
11676 * Basic glob-exporting: 'export foo::*;'
11677 * Alt now exhaustive, 'alt check' for runtime-checked
11678 * Block-function form of 'for' loop, with 'break' and 'ret'.
11681 * AST quasi-quote syntax extension
11682 * Revived libuv interface
11683 * New modules: core::{future, iter}, std::arena
11684 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11685 * Extensive cleanup, regularization in libstd, libcore
11688 Version 0.1 (2012-01-20)
11689 ===============================
11691 * Most language features work, including:
11692 * Unique pointers, unique closures, move semantics
11693 * Interface-constrained generics
11694 * Static interface dispatch
11696 * Multithread task scheduling
11697 * Typestate predicates
11698 * Failure unwinding, destructors
11699 * Pattern matching and destructuring assignment
11700 * Lightweight block-lambda syntax
11701 * Preliminary macro-by-example
11703 * Compiler works with the following configurations:
11704 * Linux: x86 and x86_64 hosts and targets
11705 * macOS: x86 and x86_64 hosts and targets
11706 * Windows: x86 hosts and targets
11708 * Cross compilation / multi-target configuration supported.
11710 * Preliminary API-documentation and package-management tools included.
11714 * Documentation is incomplete.
11716 * Performance is below intended target.
11718 * Standard library APIs are subject to extensive change, reorganization.
11720 * Language-level versioning is not yet operational - future code will
11721 break unexpectedly.