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 - [Make write/print macros eagerly drop temporaries.][96455]
31 - [Implement internal traits that enable `[OsStr]::join`.][96881]
32 - [Implement `Hash` for `core::alloc::Layout`.][97034]
33 - [Add capacity documentation for `OsString`.][97202]
34 - [Put a bound on collection misbehavior.][97316]
35 - [Make `std::mem::needs_drop` accept `?Sized`.][97675]
36 - [`impl Termination for Infallible` and then make the `Result` impls of `Termination` more generic.][97803]
37 - [Document Rust's stance on `/proc/self/mem`.][97837]
44 - [`BinaryHeap::try_reserve`]
45 - [`BinaryHeap::try_reserve_exact`]
46 - [`OsString::try_reserve`]
47 - [`OsString::try_reserve_exact`]
48 - [`PathBuf::try_reserve`]
49 - [`PathBuf::try_reserve_exact`]
50 - [`Path::try_exists`]
52 - [`RefMut::filter_map`]
53 - [`NonNull::<[T]>::len`][`NonNull::<slice>::len`]
54 - [`ToOwned::clone_into`]
55 - [`Ipv6Addr::to_ipv4_mapped`]
57 - [`unix::io::BorrowedFd<'fd>`]
58 - [`unix::io::OwnedFd`]
59 - [`windows::io::AsHandle`]
60 - [`windows::io::BorrowedHandle<'handle>`]
61 - [`windows::io::OwnedHandle`]
62 - [`windows::io::HandleOrInvalid`]
63 - [`windows::io::HandleOrNull`]
64 - [`windows::io::InvalidHandleError`]
65 - [`windows::io::NullHandleError`]
66 - [`windows::io::AsSocket`]
67 - [`windows::io::BorrowedSocket<'handle>`]
68 - [`windows::io::OwnedSocket`]
71 - [`thread::ScopedJoinHandle`]
73 These APIs are now usable in const contexts:
77 - [`intrinsics::copy`]
78 - [`intrinsics::copy_nonoverlapping`]
79 - [`<*const T>::copy_to`]
80 - [`<*const T>::copy_to_nonoverlapping`]
81 - [`<*mut T>::copy_to`]
82 - [`<*mut T>::copy_to_nonoverlapping`]
83 - [`<*mut T>::copy_from`]
84 - [`<*mut T>::copy_from_nonoverlapping`]
86 - [`Utf8Error::error_len`]
87 - [`Utf8Error::valid_up_to`]
94 - [Stabilize the `--config path` command-line argument.][cargo/10755]
95 - [Expose rust-version in the environment as `CARGO_PKG_RUST_VERSION`.][cargo/10713]
100 - [`#[link]` attributes are now checked more strictly,][96885] which may introduce
101 errors for invalid attribute arguments that were previously ignored.
106 These changes provide no direct user facing benefits, but represent significant
107 improvements to the internals and overall performance of rustc
110 - [Prepare Rust for LLVM opaque pointers.][94214]
112 [94214]: https://github.com/rust-lang/rust/pull/94214/
113 [94530]: https://github.com/rust-lang/rust/pull/94530/
114 [94954]: https://github.com/rust-lang/rust/pull/94954/
115 [95243]: https://github.com/rust-lang/rust/pull/95243/
116 [95565]: https://github.com/rust-lang/rust/pull/95565/
117 [95632]: https://github.com/rust-lang/rust/pull/95632/
118 [95818]: https://github.com/rust-lang/rust/pull/95818/
119 [95897]: https://github.com/rust-lang/rust/pull/95897/
120 [95953]: https://github.com/rust-lang/rust/pull/95953/
121 [96296]: https://github.com/rust-lang/rust/pull/96296/
122 [96455]: https://github.com/rust-lang/rust/pull/96455/
123 [96737]: https://github.com/rust-lang/rust/pull/96737/
124 [96868]: https://github.com/rust-lang/rust/pull/96868/
125 [96881]: https://github.com/rust-lang/rust/pull/96881/
126 [96885]: https://github.com/rust-lang/rust/pull/96885/
127 [96959]: https://github.com/rust-lang/rust/pull/96959/
128 [97034]: https://github.com/rust-lang/rust/pull/97034/
129 [97202]: https://github.com/rust-lang/rust/pull/97202/
130 [97316]: https://github.com/rust-lang/rust/pull/97316/
131 [97652]: https://github.com/rust-lang/rust/pull/97652/
132 [97675]: https://github.com/rust-lang/rust/pull/97675/
133 [97803]: https://github.com/rust-lang/rust/pull/97803/
134 [97837]: https://github.com/rust-lang/rust/pull/97837/
135 [97867]: https://github.com/rust-lang/rust/pull/97867/
136 [cargo/10713]: https://github.com/rust-lang/cargo/pull/10713/
137 [cargo/10755]: https://github.com/rust-lang/cargo/pull/10755/
139 [`array::from_fn`]: https://doc.rust-lang.org/stable/std/array/fn.from_fn.html
140 [`Box::into_pin`]: https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.into_pin
141 [`BinaryHeap::try_reserve_exact`]: https://doc.rust-lang.org/stable/alloc/collections/binary_heap/struct.BinaryHeap.html#method.try_reserve_exact
142 [`BinaryHeap::try_reserve`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.try_reserve
143 [`OsString::try_reserve`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve
144 [`OsString::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.try_reserve_exact
145 [`PathBuf::try_reserve`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve
146 [`PathBuf::try_reserve_exact`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.try_reserve_exact
147 [`Path::try_exists`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.try_exists
148 [`Ref::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.Ref.html#method.filter_map
149 [`RefMut::filter_map`]: https://doc.rust-lang.org/stable/std/cell/struct.RefMut.html#method.filter_map
150 [`NonNull::<slice>::len`]: https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.len
151 [`ToOwned::clone_into`]: https://doc.rust-lang.org/stable/std/borrow/trait.ToOwned.html#method.clone_into
152 [`Ipv6Addr::to_ipv4_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4_mapped
153 [`unix::io::AsFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/trait.AsFd.html
154 [`unix::io::BorrowedFd<'fd>`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.BorrowedFd.html
155 [`unix::io::OwnedFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/struct.OwnedFd.html
156 [`windows::io::AsHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsHandle.html
157 [`windows::io::BorrowedHandle<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedHandle.html
158 [`windows::io::OwnedHandle`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html
159 [`windows::io::HandleOrInvalid`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrInvalid.html
160 [`windows::io::HandleOrNull`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.HandleOrNull.html
161 [`windows::io::InvalidHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.InvalidHandleError.html
162 [`windows::io::NullHandleError`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.NullHandleError.html
163 [`windows::io::AsSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/trait.AsSocket.html
164 [`windows::io::BorrowedSocket<'handle>`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.BorrowedSocket.html
165 [`windows::io::OwnedSocket`]: https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedSocket.html
166 [`thread::scope`]: https://doc.rust-lang.org/stable/std/thread/fn.scope.html
167 [`thread::Scope`]: https://doc.rust-lang.org/stable/std/thread/struct.Scope.html
168 [`thread::ScopedJoinHandle`]: https://doc.rust-lang.org/stable/std/thread/struct.ScopedJoinHandle.html
170 [`array::from_ref`]: https://doc.rust-lang.org/stable/std/array/fn.from_ref.html
171 [`slice::from_ref`]: https://doc.rust-lang.org/stable/std/slice/fn.from_ref.html
172 [`intrinsics::copy`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy.html
173 [`intrinsics::copy_nonoverlapping`]: https://doc.rust-lang.org/stable/std/intrinsics/fn.copy_nonoverlapping.html
174 [`<*const T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to
175 [`<*const T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping
176 [`<*mut T>::copy_to`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to-1
177 [`<*mut T>::copy_to_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
178 [`<*mut T>::copy_from`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from
179 [`<*mut T>::copy_from_nonoverlapping`]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.copy_from_nonoverlapping
180 [`str::from_utf8`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8.html
181 [`Utf8Error::error_len`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.error_len
182 [`Utf8Error::valid_up_to`]: https://doc.rust-lang.org/stable/std/str/struct.Utf8Error.html#method.valid_up_to
183 [`Condvar::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.new
184 [`Mutex::new`]: https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html#method.new
185 [`RwLock::new`]: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html#method.new
187 Version 1.62.1 (2022-07-19)
188 ==========================
190 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
191 library, and also mitigates a CPU vulnerability on Intel SGX.
193 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
194 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
195 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
196 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
197 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
199 [98608]: https://github.com/rust-lang/rust/issues/98608
200 [98890]: https://github.com/rust-lang/rust/issues/98890
201 [98950]: https://github.com/rust-lang/rust/pull/98950
202 [98126]: https://github.com/rust-lang/rust/pull/98126
203 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
205 Version 1.62.0 (2022-06-30)
206 ==========================
211 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
212 - [Teach flow sensitive checks that visibly uninhabited call expressions never return][93313]
213 - [Fix constants not getting dropped if part of a diverging expression][94775]
214 - [Support unit struct/enum variant in destructuring assignment][95380]
215 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
220 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
221 - [Make `unaligned_references` lint deny-by-default][95372]
222 This lint is also a future compatibility lint, and is expected to eventually
224 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
225 - [Reject `#[thread_local]` attribute on non-static items][95006]
226 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
227 - [Implement a lint to warn about unused macro rules][96150]
228 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
230 \* Refer to Rust's [platform support page][platform-support-doc] for more
231 information on Rust's tiered platform support.
236 - [Windows: Use a pipe relay for chaining pipes][95841]
237 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
238 - [Replace RwLock by a futex based one on Linux][95801]
239 - [std: directly use pthread in UNIX parker implementation][96393]
244 - [`bool::then_some`]
248 - [`windows::CommandExt::raw_arg`]
249 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
250 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
251 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
252 - [`FusedIterator for EncodeWide`]
253 - [RDM intrinsics on aarch64][stdarch/1285]
258 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
263 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
265 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
266 - Package ID specs now support `name@version` syntax in addition to the
267 previous `name:version` to align with the behavior in `cargo add` and other
268 tools. `cargo install` and `cargo yank` also now support this syntax so the
269 version does not need to passed as a separate flag.
270 - The `git` and `registry` directories in Cargo's home directory (usually
271 `~/.cargo`) are now marked as cache directories so that they are not
272 included in backups or content indexing (on Windows).
273 - Added automatic `@` argfile support, which will use "response files" if the
274 command-line to `rustc` exceeds the operating system's limit.
279 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
280 the same as the host target.
281 [#10594](https://github.com/rust-lang/cargo/pull/10594)
282 - [rustdoc: doctests are now run on unexported `macro_rules!` macros, matching other private items][96630]
283 - [rustdoc: Remove .woff font files][96279]
284 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
285 - [Windows: Fix potentinal unsoundness by aborting if `File` reads or writes cannot
286 complete synchronously][95469].
291 - [Unify ReentrantMutex implementations across all platforms][96042]
293 These changes provide no direct user facing benefits, but represent significant
294 improvements to the internals and overall performance of rustc
297 [93313]: https://github.com/rust-lang/rust/pull/93313/
298 [93969]: https://github.com/rust-lang/rust/pull/93969/
299 [94206]: https://github.com/rust-lang/rust/pull/94206/
300 [94457]: https://github.com/rust-lang/rust/pull/94457/
301 [94775]: https://github.com/rust-lang/rust/pull/94775/
302 [94872]: https://github.com/rust-lang/rust/pull/94872/
303 [95006]: https://github.com/rust-lang/rust/pull/95006/
304 [95035]: https://github.com/rust-lang/rust/pull/95035/
305 [95372]: https://github.com/rust-lang/rust/pull/95372/
306 [95380]: https://github.com/rust-lang/rust/pull/95380/
307 [95431]: https://github.com/rust-lang/rust/pull/95431/
308 [95469]: https://github.com/rust-lang/rust/pull/95469/
309 [95705]: https://github.com/rust-lang/rust/pull/95705/
310 [95801]: https://github.com/rust-lang/rust/pull/95801/
311 [95819]: https://github.com/rust-lang/rust/pull/95819/
312 [95841]: https://github.com/rust-lang/rust/pull/95841/
313 [96042]: https://github.com/rust-lang/rust/pull/96042/
314 [96150]: https://github.com/rust-lang/rust/pull/96150/
315 [96268]: https://github.com/rust-lang/rust/pull/96268/
316 [96279]: https://github.com/rust-lang/rust/pull/96279/
317 [96393]: https://github.com/rust-lang/rust/pull/96393/
318 [96436]: https://github.com/rust-lang/rust/pull/96436/
319 [96557]: https://github.com/rust-lang/rust/pull/96557/
320 [96630]: https://github.com/rust-lang/rust/pull/96630/
322 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
323 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
324 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
325 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
326 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
327 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
328 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
329 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
330 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
331 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
333 Version 1.61.0 (2022-05-19)
334 ==========================
339 - [`const fn` signatures can now include generic trait bounds][93827]
340 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
341 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
342 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
347 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
348 - [The `char` type is now described as UTF-32 in debuginfo][89887]
349 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
350 - X86 [`#[target_feature = "adx"]` is now stable][93745]
355 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
356 - [`#[ignore = "…"]` messages are printed when running tests][92714]
357 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
358 - [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.
359 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
360 - [`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.
365 - [`Pin::static_mut`]
366 - [`Pin::static_ref`]
367 - [`Vec::retain_mut`]
368 - [`VecDeque::retain_mut`]
369 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
370 - [`std::os::unix::net::SocketAddr::from_pathname`]
371 - [`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.
372 - [`std::thread::JoinHandle::is_finished`]
374 These APIs are now usable in const contexts:
376 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
377 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
378 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
379 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
380 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
381 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
382 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
383 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
384 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
389 No feature changes, but see compatibility notes.
394 - 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
395 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
396 - (less common) or be updated to use the [`+whole-archive`] modifier.
397 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
398 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
399 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
400 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
401 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
402 - [`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`.
403 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
408 These changes provide no direct user facing benefits, but represent significant
409 improvements to the internals and overall performance of rustc
412 - [debuginfo: Refactor debuginfo generation for types][94261]
413 - [Remove the everybody loops pass][93913]
415 [88375]: https://github.com/rust-lang/rust/pull/88375/
416 [89887]: https://github.com/rust-lang/rust/pull/89887/
417 [90621]: https://github.com/rust-lang/rust/pull/90621/
418 [92285]: https://github.com/rust-lang/rust/pull/92285/
419 [92472]: https://github.com/rust-lang/rust/pull/92472/
420 [92697]: https://github.com/rust-lang/rust/pull/92697/
421 [92714]: https://github.com/rust-lang/rust/pull/92714/
422 [92911]: https://github.com/rust-lang/rust/pull/92911/
423 [93263]: https://github.com/rust-lang/rust/pull/93263/
424 [93745]: https://github.com/rust-lang/rust/pull/93745/
425 [93827]: https://github.com/rust-lang/rust/pull/93827/
426 [93901]: https://github.com/rust-lang/rust/pull/93901/
427 [93913]: https://github.com/rust-lang/rust/pull/93913/
428 [93965]: https://github.com/rust-lang/rust/pull/93965/
429 [94081]: https://github.com/rust-lang/rust/pull/94081/
430 [94261]: https://github.com/rust-lang/rust/pull/94261/
431 [94295]: https://github.com/rust-lang/rust/pull/94295/
432 [94832]: https://github.com/rust-lang/rust/pull/94832/
433 [95016]: https://github.com/rust-lang/rust/pull/95016/
434 [95251]: https://github.com/rust-lang/rust/pull/95251/
435 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
436 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
437 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
438 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
439 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
440 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
441 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
442 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
443 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
444 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
445 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
446 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
447 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
448 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
449 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
450 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
451 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
452 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
453 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
454 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
455 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
456 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
459 Version 1.60.0 (2022-04-07)
460 ==========================
464 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
465 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
469 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
470 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
471 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
472 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
473 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
474 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
475 - [Fix invalid removal of newlines from doc comments][92357]
476 - [Add kernel target for RustyHermit][92670]
477 - [Deny mixing bin crate type with lib crate types][92933]
478 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
479 - [Upgrade to LLVM 14][93577]
481 \* Refer to Rust's [platform support page][platform-support-doc] for more
482 information on Rust's tiered platform support.
486 - [Guarantee call order for `sort_by_cached_key`][89621]
487 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
488 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
489 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
490 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
494 - [`Arc::new_cyclic`][arc_new_cyclic]
495 - [`Rc::new_cyclic`][rc_new_cyclic]
496 - [`slice::EscapeAscii`][slice_escape_ascii]
497 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
498 - [`u8::escape_ascii`][u8_escape_ascii]
499 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
500 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
501 - [`MaybeUninit::assume_init_read`][assume_init_read]
502 - [`i8::abs_diff`][i8_abs_diff]
503 - [`i16::abs_diff`][i16_abs_diff]
504 - [`i32::abs_diff`][i32_abs_diff]
505 - [`i64::abs_diff`][i64_abs_diff]
506 - [`i128::abs_diff`][i128_abs_diff]
507 - [`isize::abs_diff`][isize_abs_diff]
508 - [`u8::abs_diff`][u8_abs_diff]
509 - [`u16::abs_diff`][u16_abs_diff]
510 - [`u32::abs_diff`][u32_abs_diff]
511 - [`u64::abs_diff`][u64_abs_diff]
512 - [`u128::abs_diff`][u128_abs_diff]
513 - [`usize::abs_diff`][usize_abs_diff]
514 - [`Display for io::ErrorKind`][display_error_kind]
515 - [`From<u8> for ExitCode`][from_u8_exit_code]
516 - [`Not for !` (the "never" type)][not_never]
517 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
518 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
522 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
523 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
524 - [Stabilize namespaced and weak dependency features.][cargo/10269]
525 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
526 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
530 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
531 - [Drop rustc-docs from complete profile][93742]
532 - [bootstrap: tidy up flag handling for llvm build][93918]
536 - [Remove compiler-rt linking hack on Android][83822]
537 - [Mitigations for platforms with non-monotonic clocks have been removed from
538 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
539 instant is not guaranteed to be greater than an earlier instant anymore.
540 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
541 saturating to `0` instead][89926]. In the real world the panic happened mostly
542 on platforms with buggy monotonic clock implementations rather than catching
543 programming errors like reversing the start and end times. Such programming
544 errors will now results in `0` rather than a panic.
545 - In a future release we're planning to increase the baseline requirements for
546 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
547 your feedback in [PR #95026][95026].
552 These changes provide no direct user facing benefits, but represent significant
553 improvements to the internals and overall performance of rustc
556 - [Switch all libraries to the 2021 edition][92068]
558 [83822]: https://github.com/rust-lang/rust/pull/83822
559 [86374]: https://github.com/rust-lang/rust/pull/86374
560 [87487]: https://github.com/rust-lang/rust/pull/87487
561 [89621]: https://github.com/rust-lang/rust/pull/89621
562 [89926]: https://github.com/rust-lang/rust/pull/89926
563 [90132]: https://github.com/rust-lang/rust/pull/90132
564 [90247]: https://github.com/rust-lang/rust/pull/90247
565 [91606]: https://github.com/rust-lang/rust/pull/91606
566 [92068]: https://github.com/rust-lang/rust/pull/92068
567 [92300]: https://github.com/rust-lang/rust/pull/92300
568 [92357]: https://github.com/rust-lang/rust/pull/92357
569 [92383]: https://github.com/rust-lang/rust/pull/92383
570 [92630]: https://github.com/rust-lang/rust/pull/92630
571 [92670]: https://github.com/rust-lang/rust/pull/92670
572 [92800]: https://github.com/rust-lang/rust/pull/92800
573 [92933]: https://github.com/rust-lang/rust/pull/92933
574 [93566]: https://github.com/rust-lang/rust/pull/93566
575 [93577]: https://github.com/rust-lang/rust/pull/93577
576 [93658]: https://github.com/rust-lang/rust/pull/93658
577 [93742]: https://github.com/rust-lang/rust/pull/93742
578 [93824]: https://github.com/rust-lang/rust/pull/93824
579 [93918]: https://github.com/rust-lang/rust/pull/93918
580 [95026]: https://github.com/rust-lang/rust/pull/95026
582 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
583 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
584 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
585 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
586 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
588 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
589 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
590 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
591 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
592 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
593 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
594 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
595 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
596 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
597 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
598 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
599 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
600 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
601 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
602 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
603 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
604 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
605 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
606 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
607 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
608 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
609 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
610 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
611 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
612 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
614 Version 1.59.0 (2022-02-24)
615 ==========================
620 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
621 - [Stabilize destructuring assignment][90521]
622 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
623 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
628 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
629 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
630 - [Fix sparc64 ABI for aggregates with floating point members][91003]
631 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
632 - [Add support for riscv64gc-unknown-freebsd][91284]
633 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
634 - [Soft disable incremental compilation][94124]
636 This release disables incremental compilation, unless the user has explicitly
637 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
638 This is due to a known and relatively frequently occurring bug in incremental
639 compilation, which causes builds to issue internal compiler errors. This
640 particular bug is already fixed on nightly, but that fix has not yet rolled out
641 to stable and is deemed too risky for a direct stable backport.
643 As always, we encourage users to test with nightly and report bugs so that we
644 can track failures and fix issues earlier.
646 See [94124] for more details.
648 [94124]: https://github.com/rust-lang/rust/issues/94124
653 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
658 - [`std::thread::available_parallelism`][available_parallelism]
659 - [`Result::copied`][result-copied]
660 - [`Result::cloned`][result-cloned]
661 - [`arch::asm!`][asm]
662 - [`arch::global_asm!`][global_asm]
663 - [`ops::ControlFlow::is_break`][is_break]
664 - [`ops::ControlFlow::is_continue`][is_continue]
665 - [`TryFrom<char> for u8`][try_from_char_u8]
666 - [`char::TryFromCharError`][try_from_char_err]
667 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
669 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
670 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
671 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
672 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
673 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
674 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
675 - [`DoubleEndedIterator for ToLowercase`][lowercase]
676 - [`DoubleEndedIterator for ToUppercase`][uppercase]
677 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
678 - [`UnwindSafe for Once`][unwindsafe_once]
679 - [`RefUnwindSafe for Once`][refunwindsafe_once]
680 - [armv8 neon intrinsics for aarch64][stdarch/1266]
684 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
685 - [`mem::MaybeUninit::assume_init`][muninit_init]
686 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
687 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
692 - [Stabilize the `strip` profile option][cargo/10088]
693 - [Stabilize future-incompat-report][cargo/10165]
694 - [Support abbreviating `--release` as `-r`][cargo/10133]
695 - [Support `term.quiet` configuration][cargo/10152]
696 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
701 - [Refactor weak symbols in std::sys::unix][90846]
702 This may add new, versioned, symbols when building with a newer glibc, as the
703 standard library uses weak linkage rather than dynamically attempting to load
704 certain symbols at runtime.
705 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
706 This adds a future compatibility lint to supporting the use of cfg_attr
707 wrapping either crate_type or crate_name specification within Rust files;
708 it is recommended that users migrate to setting the equivalent command line
710 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
711 This may expose new names, leading to conflicts with preexisting names in a
712 given namespace and a compilation failure.
713 - [Cargo will document libraries before binaries.][cargo/10172]
714 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
715 - [Weaken guarantee around advancing underlying iterators in zip][83791]
716 - [Make split_inclusive() on an empty slice yield an empty output][89825]
717 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
718 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
723 These changes provide no direct user facing benefits, but represent significant
724 improvements to the internals and overall performance of rustc
727 - [Fix many cases of normalization-related ICEs][91255]
728 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
729 - [Store liveness in interval sets for region inference][90637]
731 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
732 unstable feature.][91867]
734 [91867]: https://github.com/rust-lang/rust/issues/91867
735 [83744]: https://github.com/rust-lang/rust/pull/83744/
736 [83791]: https://github.com/rust-lang/rust/pull/83791/
737 [85013]: https://github.com/rust-lang/rust/pull/85013/
738 [89825]: https://github.com/rust-lang/rust/pull/89825/
739 [89999]: https://github.com/rust-lang/rust/pull/89999/
740 [90128]: https://github.com/rust-lang/rust/pull/90128/
741 [90207]: https://github.com/rust-lang/rust/pull/90207/
742 [90521]: https://github.com/rust-lang/rust/pull/90521/
743 [90586]: https://github.com/rust-lang/rust/pull/90586/
744 [90637]: https://github.com/rust-lang/rust/pull/90637/
745 [90833]: https://github.com/rust-lang/rust/pull/90833/
746 [90846]: https://github.com/rust-lang/rust/pull/90846/
747 [91003]: https://github.com/rust-lang/rust/pull/91003/
748 [91172]: https://github.com/rust-lang/rust/pull/91172/
749 [91255]: https://github.com/rust-lang/rust/pull/91255/
750 [91284]: https://github.com/rust-lang/rust/pull/91284/
751 [91535]: https://github.com/rust-lang/rust/pull/91535/
752 [91593]: https://github.com/rust-lang/rust/pull/91593/
753 [91728]: https://github.com/rust-lang/rust/pull/91728/
754 [91878]: https://github.com/rust-lang/rust/pull/91878/
755 [91896]: https://github.com/rust-lang/rust/pull/91896/
756 [91926]: https://github.com/rust-lang/rust/pull/91926/
757 [91984]: https://github.com/rust-lang/rust/pull/91984/
758 [92020]: https://github.com/rust-lang/rust/pull/92020/
759 [92034]: https://github.com/rust-lang/rust/pull/92034/
760 [92137]: https://github.com/rust-lang/rust/pull/92137/
761 [92483]: https://github.com/rust-lang/rust/pull/92483/
762 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
763 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
764 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
765 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
766 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
767 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
768 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
769 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
771 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
772 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
773 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
774 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
775 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
776 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
777 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
778 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
779 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
780 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
781 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
782 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
783 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
784 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
785 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
786 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
787 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
788 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
789 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
790 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
791 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
792 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
793 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
794 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
795 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
796 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
798 Version 1.58.1 (2022-01-19)
799 ===========================
801 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
802 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
803 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
804 * [Fix wrong error message displayed when some imports are missing][91254]
805 * [Fix rustfmt not formatting generated files from stdin][92912]
807 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
808 [91254]: https://github.com/rust-lang/rust/pull/91254
809 [92912]: https://github.com/rust-lang/rust/pull/92912
810 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
811 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
813 Version 1.58.0 (2022-01-13)
814 ==========================
819 - [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.
820 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
821 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
826 - [Add LLVM CFI support to the Rust compiler][89652]
827 - [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.
828 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
829 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
830 - [Update the minimum external LLVM to 12][90175]
831 - [Add `x86_64-unknown-none` at Tier 3*][89062]
832 - [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.
833 - [Don't abort compilation after giving a lint error][87337]
834 - [Error messages point at the source of trait bound obligations in more places][89580]
836 \* Refer to Rust's [platform support page][platform-support-doc] for more
837 information on Rust's tiered platform support.
842 - [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.
843 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
844 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
845 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
846 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
847 - [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).
852 - [`Metadata::is_symlink`]
853 - [`Path::is_symlink`]
854 - [`{integer}::saturating_div`]
855 - [`Option::unwrap_unchecked`]
856 - [`Result::unwrap_unchecked`]
857 - [`Result::unwrap_err_unchecked`]
860 These APIs are now usable in const contexts:
863 - [`Duration::checked_add`]
864 - [`Duration::saturating_add`]
865 - [`Duration::checked_sub`]
866 - [`Duration::saturating_sub`]
867 - [`Duration::checked_mul`]
868 - [`Duration::saturating_mul`]
869 - [`Duration::checked_div`]
874 - [Add --message-format for install command][cargo/10107]
875 - [Warn when alias shadows external subcommand][cargo/10082]
880 - [Show all Deref implementations recursively in rustdoc][90183]
881 - [Use computed visibility in rustdoc][88447]
886 - [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.
887 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
888 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
889 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
890 - [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.
891 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
896 These changes provide no direct user facing benefits, but represent significant
897 improvements to the internals and overall performance of rustc
900 - [Implement coherence checks for negative trait impls][90104]
901 - [Add rustc lint, warning when iterating over hashmaps][89558]
902 - [Optimize live point computation][90491]
903 - [Enable verification for 1/32nd of queries loaded from disk][90361]
904 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
906 [87337]: https://github.com/rust-lang/rust/pull/87337/
907 [87467]: https://github.com/rust-lang/rust/pull/87467/
908 [87704]: https://github.com/rust-lang/rust/pull/87704/
909 [88041]: https://github.com/rust-lang/rust/pull/88041/
910 [88447]: https://github.com/rust-lang/rust/pull/88447/
911 [88601]: https://github.com/rust-lang/rust/pull/88601/
912 [89062]: https://github.com/rust-lang/rust/pull/89062/
913 [89174]: https://github.com/rust-lang/rust/pull/89174/
914 [89551]: https://github.com/rust-lang/rust/pull/89551/
915 [89558]: https://github.com/rust-lang/rust/pull/89558/
916 [89580]: https://github.com/rust-lang/rust/pull/89580/
917 [89652]: https://github.com/rust-lang/rust/pull/89652/
918 [90041]: https://github.com/rust-lang/rust/pull/90041/
919 [90058]: https://github.com/rust-lang/rust/pull/90058/
920 [90104]: https://github.com/rust-lang/rust/pull/90104/
921 [90117]: https://github.com/rust-lang/rust/pull/90117/
922 [90175]: https://github.com/rust-lang/rust/pull/90175/
923 [90183]: https://github.com/rust-lang/rust/pull/90183/
924 [90297]: https://github.com/rust-lang/rust/pull/90297/
925 [90329]: https://github.com/rust-lang/rust/pull/90329/
926 [90361]: https://github.com/rust-lang/rust/pull/90361/
927 [90417]: https://github.com/rust-lang/rust/pull/90417/
928 [90473]: https://github.com/rust-lang/rust/pull/90473/
929 [90491]: https://github.com/rust-lang/rust/pull/90491/
930 [90733]: https://github.com/rust-lang/rust/pull/90733/
931 [90833]: https://github.com/rust-lang/rust/pull/90833/
932 [90846]: https://github.com/rust-lang/rust/pull/90846/
933 [91026]: https://github.com/rust-lang/rust/pull/91026/
934 [91207]: https://github.com/rust-lang/rust/pull/91207/
935 [91255]: https://github.com/rust-lang/rust/pull/91255/
936 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
937 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
938 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
939 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
940 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
941 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
942 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
943 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
944 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
945 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
947 Version 1.57.0 (2021-12-02)
948 ==========================
953 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
954 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
955 - [Allow panicking in constant evaluation.][89508]
956 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
961 - [Create more accurate debuginfo for vtables.][89597]
962 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
963 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
964 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
965 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
967 \* Refer to Rust's [platform support page][platform-support-doc] for more
968 information on Rust's tiered platform support.
973 - [Avoid allocations and copying in `Vec::leak`][89337]
974 - [Add `#[repr(i8)]` to `Ordering`][89507]
975 - [Optimize `File::read_to_end` and `read_to_string`][89582]
976 - [Update to Unicode 14.0][89614]
977 - [Many more functions are marked `#[must_use]`][89692], producing a warning
978 when ignoring their return value. This helps catch mistakes such as expecting
979 a function to mutate a value in place rather than return a new value.
984 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
985 - [`[T; N]::as_slice`][`array::as_slice`]
986 - [`collections::TryReserveError`]
987 - [`HashMap::try_reserve`]
988 - [`HashSet::try_reserve`]
989 - [`String::try_reserve`]
990 - [`String::try_reserve_exact`]
991 - [`Vec::try_reserve`]
992 - [`Vec::try_reserve_exact`]
993 - [`VecDeque::try_reserve`]
994 - [`VecDeque::try_reserve_exact`]
995 - [`Iterator::map_while`]
997 - [`proc_macro::is_available`]
998 - [`Command::get_program`]
999 - [`Command::get_args`]
1000 - [`Command::get_envs`]
1001 - [`Command::get_current_dir`]
1005 These APIs are now usable in const contexts:
1007 - [`hint::unreachable_unchecked`]
1012 - [Stabilize custom profiles][cargo/9943]
1017 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
1018 This will break some builds that set `#![deny(dead_code)]`.
1022 These changes provide no direct user facing benefits, but represent significant
1023 improvements to the internals and overall performance of rustc
1026 - [Added an experimental backend for codegen with `libgccjit`.][87260]
1028 [85200]: https://github.com/rust-lang/rust/pull/85200/
1029 [86191]: https://github.com/rust-lang/rust/pull/86191/
1030 [87220]: https://github.com/rust-lang/rust/pull/87220/
1031 [87260]: https://github.com/rust-lang/rust/pull/87260/
1032 [88321]: https://github.com/rust-lang/rust/pull/88321/
1033 [88529]: https://github.com/rust-lang/rust/pull/88529/
1034 [88690]: https://github.com/rust-lang/rust/pull/88690/
1035 [88952]: https://github.com/rust-lang/rust/pull/88952/
1036 [89337]: https://github.com/rust-lang/rust/pull/89337/
1037 [89507]: https://github.com/rust-lang/rust/pull/89507/
1038 [89508]: https://github.com/rust-lang/rust/pull/89508/
1039 [89582]: https://github.com/rust-lang/rust/pull/89582/
1040 [89597]: https://github.com/rust-lang/rust/pull/89597/
1041 [89614]: https://github.com/rust-lang/rust/pull/89614/
1042 [89692]: https://github.com/rust-lang/rust/issues/89692/
1043 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
1044 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
1045 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
1046 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
1047 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
1048 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
1049 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
1050 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
1051 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
1052 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
1053 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
1054 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
1055 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
1056 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
1057 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
1058 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
1059 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
1060 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
1061 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
1062 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
1063 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
1065 Version 1.56.1 (2021-11-01)
1066 ===========================
1068 - New lints to detect the presence of bidirectional-override Unicode
1069 codepoints in the compiled source code ([CVE-2021-42574])
1071 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
1073 Version 1.56.0 (2021-10-21)
1074 ========================
1079 - [The 2021 Edition is now stable.][rust#88100]
1080 See [the edition guide][rust-2021-edition-guide] for more details.
1081 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
1082 - [Union field access is permitted in `const fn`.][rust#85769]
1084 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
1089 - [Upgrade to LLVM 13.][rust#87570]
1090 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
1091 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
1092 - [Warnings can be forced on with `--force-warn`.][rust#87472]
1093 This feature is primarily intended for usage by `cargo fix`, rather than end users.
1094 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
1095 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
1096 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
1098 \* Refer to Rust's [platform support page][platform-support-doc] for more
1099 information on Rust's tiered platform support.
1104 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
1105 The Windows console still requires valid Unicode, but this change allows
1106 splitting a UTF-8 character across multiple write calls. This allows, for
1107 instance, programs that just read and write data buffers (e.g. copying a file
1108 to stdout) without regard for Unicode or character boundaries.
1109 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
1110 For this use case, atomics scale much better under contention.
1111 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
1112 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
1113 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
1114 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
1115 - [Treat invalid environment variable names as non-existent.][rust#86183]
1116 Previously, the environment functions would panic if given a variable name
1117 with an internal null character or equal sign (`=`). Now, these functions will
1118 just treat such names as non-existent variables, since the OS cannot represent
1119 the existence of a variable with such a name.
1124 - [`std::os::unix::fs::chroot`]
1125 - [`UnsafeCell::raw_get`]
1126 - [`BufWriter::into_parts`]
1127 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
1128 These APIs were previously stable in `std`, but are now also available in `core`.
1129 - [`Vec::shrink_to`]
1130 - [`String::shrink_to`]
1131 - [`OsString::shrink_to`]
1132 - [`PathBuf::shrink_to`]
1133 - [`BinaryHeap::shrink_to`]
1134 - [`VecDeque::shrink_to`]
1135 - [`HashMap::shrink_to`]
1136 - [`HashSet::shrink_to`]
1138 These APIs are now usable in const contexts:
1140 - [`std::mem::transmute`]
1141 - [`[T]::first`][`slice::first`]
1142 - [`[T]::split_first`][`slice::split_first`]
1143 - [`[T]::last`][`slice::last`]
1144 - [`[T]::split_last`][`slice::split_last`]
1149 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
1150 This has no effect at present on dependency version selection.
1151 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
1152 that support Rust code to include a crate's specified minimum version in the test matrix for that
1158 - [Update to new argument parsing rules on Windows.][rust#87580]
1159 This adjusts Rust's standard library to match the behavior of the standard
1160 libraries for C/C++. The rules have changed slightly over time, and this PR
1161 brings us to the latest set of rules (changed in 2008).
1162 - [Disallow the aapcs calling convention on aarch64][rust#88399]
1163 This was already not supported by LLVM; this change surfaces this lack of
1164 support with a better error message.
1165 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
1166 - [Warn when an escaped newline skips multiple lines.][rust#87671]
1167 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
1168 may return different values on glibc <= 2.24.][rust#81825]
1169 Rust now invokes the `clone3` system call directly, when available, to use new functionality
1170 available via that system call. Older versions of glibc cache the result of `getpid`, and only
1171 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
1172 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
1176 These changes provide no direct user facing benefits, but represent significant
1177 improvements to the internals and overall performance of rustc
1180 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
1181 This improves the performance of most Rust builds.
1182 - [Unify representation of macros in internal data structures.][rust#88019]
1183 This change fixes a host of bugs with the handling of macros by the compiler,
1186 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
1187 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
1188 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1189 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1190 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1191 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1192 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1193 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1194 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1195 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1196 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1197 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1198 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1199 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1200 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1201 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1202 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1203 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1204 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1205 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1206 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1207 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1208 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1209 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1210 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1211 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1212 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1213 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1214 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1215 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1216 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1217 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1218 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1219 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1220 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1221 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1222 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1223 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1224 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1225 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1226 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1227 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1229 Version 1.55.0 (2021-09-09)
1230 ============================
1234 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1235 will end at the maximum value of the integer.][83918]
1236 - [You can now explicitly import the prelude of different editions
1237 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1241 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1243 \* Refer to Rust's [platform support page][platform-support-doc] for more
1244 information on Rust's tiered platform support.
1249 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1250 These improvements should in general provide faster string parsing of floats,
1251 no longer reject certain valid floating point values, and reduce
1252 the produced code size for non-stripped artifacts.
1253 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1260 - [`IntoInnerError::into_error`]
1261 - [`IntoInnerError::into_parts`]
1262 - [`MaybeUninit::assume_init_mut`]
1263 - [`MaybeUninit::assume_init_ref`]
1264 - [`MaybeUninit::write`]
1266 - [`ops::ControlFlow`]
1268 - [`x86::_bittestandcomplement`]
1269 - [`x86::_bittestandreset`]
1270 - [`x86::_bittestandset`]
1271 - [`x86_64::_bittest64`]
1272 - [`x86_64::_bittestandcomplement64`]
1273 - [`x86_64::_bittestandreset64`]
1274 - [`x86_64::_bittestandset64`]
1276 The following previously stable functions are now `const`.
1278 - [`str::from_utf8_unchecked`]
1283 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1284 rustc in parallel such as when using `cargo test`.][cargo/9675]
1285 - [The package definition in `cargo metadata` now includes the `"default_run"`
1286 field from the manifest.][cargo/9550]
1287 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1288 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1289 of packages.][cargo/9663]
1293 - [Added "Go to item on exact match" search option.][85876]
1294 - [The "Implementors" section on traits no longer shows redundant
1295 method definitions.][85970]
1296 - [Trait implementations are toggled open by default.][86260] This should make the
1297 implementations more searchable by tools like `CTRL+F` in your browser.
1298 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1299 through type aliases.][86334]
1300 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1301 "Trait Implementations" section.][86513]
1306 - [std functions that return an `io::Error` will no longer use the
1307 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1308 kinds of errors could be categorised [into newer more specific `ErrorKind`
1309 variants][79965], and that they do not represent a user error.
1310 - [Using environment variable names with `process::Command` on Windows now
1311 behaves as expected.][85270] Previously using envionment variables with
1312 `Command` would cause them to be ASCII-uppercased.
1313 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1314 with `rustdoc::`][86849]
1315 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1316 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1317 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1320 [86849]: https://github.com/rust-lang/rust/pull/86849
1321 [86513]: https://github.com/rust-lang/rust/pull/86513
1322 [86334]: https://github.com/rust-lang/rust/pull/86334
1323 [86260]: https://github.com/rust-lang/rust/pull/86260
1324 [85970]: https://github.com/rust-lang/rust/pull/85970
1325 [85876]: https://github.com/rust-lang/rust/pull/85876
1326 [83572]: https://github.com/rust-lang/rust/pull/83572
1327 [86294]: https://github.com/rust-lang/rust/pull/86294
1328 [86858]: https://github.com/rust-lang/rust/pull/86858
1329 [86761]: https://github.com/rust-lang/rust/pull/86761
1330 [85746]: https://github.com/rust-lang/rust/pull/85746
1331 [85270]: https://github.com/rust-lang/rust/pull/85270
1332 [83918]: https://github.com/rust-lang/rust/pull/83918
1333 [79965]: https://github.com/rust-lang/rust/pull/79965
1334 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1335 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1336 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1337 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1338 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1339 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1340 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1341 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1342 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1343 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1344 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1345 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1346 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1347 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1348 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1349 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1350 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1351 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1352 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1353 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1354 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1355 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1358 Version 1.54.0 (2021-07-29)
1359 ============================
1362 -----------------------
1364 - [You can now use macros for values in some built-in attributes.][83366]
1365 This primarily allows you to call macros within the `#[doc]` attribute. For
1366 example, to include external documentation in your crate, you can now write
1369 #![doc = include_str!("README.md")]
1372 - [You can now cast between unsized slice types (and types which contain
1373 unsized slices) in `const fn`.][85078]
1374 - [You can now use multiple generic lifetimes with `impl Trait` where the
1375 lifetimes don't explicitly outlive another.][84701] In code this means
1376 that you can now have `impl Trait<'a, 'b>` where as before you could
1377 only have `impl Trait<'a, 'b> where 'b: 'a`.
1380 -----------------------
1382 - [Rustc will now search for custom JSON targets in
1383 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1384 directory.][83800] You can find your sysroot directory by running
1385 `rustc --print sysroot`.
1386 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1387 - [You can now use `#[target_feature]` on safe functions when targeting
1388 WebAssembly platforms.][84988]
1389 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1390 - [Added tier 3\* support for `bpfel-unknown-none`
1391 and `bpfeb-unknown-none`.][79608]
1392 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1394 \* Refer to Rust's [platform support page][platform-support-doc] for more
1395 information on Rust's tiered platform support.
1398 -----------------------
1400 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1401 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1402 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1403 - [The implementations of vendor intrinsics in core::arch have been
1404 significantly refactored.][83278] The main user-visible changes are
1405 a 50% reduction in the size of libcore.rlib and stricter validation
1406 of constant operands passed to intrinsics. The latter is technically
1407 a breaking change, but allows Rust to more closely match the C vendor
1413 - [`BTreeMap::into_keys`]
1414 - [`BTreeMap::into_values`]
1415 - [`HashMap::into_keys`]
1416 - [`HashMap::into_values`]
1418 - [`VecDeque::binary_search`]
1419 - [`VecDeque::binary_search_by`]
1420 - [`VecDeque::binary_search_by_key`]
1421 - [`VecDeque::partition_point`]
1426 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1427 the dependency graph.][cargo/9520]
1428 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1429 in the tree ][cargo/9499]
1430 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1431 macro dependencies.][cargo/9488]
1432 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1433 This variable points to a directory that integration tests and benches
1434 can use as a "scratchpad" for testing filesystem operations.
1438 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1439 - [Previously unsound code is no longer permitted where different constructors in branches
1440 could require different lifetimes.][85574]
1441 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
1442 than before and may reject some previously accepted code.
1443 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1444 when compiled with `codegen-units = 1`.][86063]
1446 [85574]: https://github.com/rust-lang/rust/issues/85574
1447 [86831]: https://github.com/rust-lang/rust/issues/86831
1448 [86063]: https://github.com/rust-lang/rust/issues/86063
1449 [79608]: https://github.com/rust-lang/rust/pull/79608
1450 [84988]: https://github.com/rust-lang/rust/pull/84988
1451 [84701]: https://github.com/rust-lang/rust/pull/84701
1452 [84072]: https://github.com/rust-lang/rust/pull/84072
1453 [85745]: https://github.com/rust-lang/rust/pull/85745
1454 [84744]: https://github.com/rust-lang/rust/pull/84744
1455 [85078]: https://github.com/rust-lang/rust/pull/85078
1456 [84717]: https://github.com/rust-lang/rust/pull/84717
1457 [83800]: https://github.com/rust-lang/rust/pull/83800
1458 [83366]: https://github.com/rust-lang/rust/pull/83366
1459 [83278]: https://github.com/rust-lang/rust/pull/83278
1460 [85292]: https://github.com/rust-lang/rust/pull/85292
1461 [82834]: https://github.com/rust-lang/rust/pull/82834
1462 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1463 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1464 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1465 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1466 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1467 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1468 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1469 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1470 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1471 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1472 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1474 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1476 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1478 Version 1.53.0 (2021-06-17)
1479 ============================
1482 -----------------------
1483 - [You can now use unicode for identifiers.][83799] This allows multilingual
1484 identifiers but still doesn't allow glyphs that are not considered characters
1485 such as `◆` or `🦀`. More specifically you can now use any identifier that
1486 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1487 is the same standard as languages like Python, however Rust uses NFC
1488 normalization which may be different from other languages.
1489 - [You can now specify "or patterns" inside pattern matches.][79278]
1490 Previously you could only use `|` (OR) on complete patterns. E.g.
1494 matches!(x, Some(1) | Some(2));
1496 matches!(x, Some(1 | 2));
1498 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1499 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1500 to change semantics to being a pattern fragment in a future edition.
1503 -----------------------
1504 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1505 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1506 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1508 \* Refer to Rust's [platform support page][platform-support-doc] for more
1509 information on Rust's tiered platform support.
1512 -----------------------
1513 - [Abort messages will now forward to `android_set_abort_message` on
1514 Android platforms when available.][81469]
1515 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1516 - [Arrays of any length now implement `IntoIterator`.][84147]
1517 Currently calling `.into_iter()` as a method on an array will
1518 return `impl Iterator<Item=&T>`, but this may change in a
1519 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1520 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1521 - [`leading_zeros`, and `trailing_zeros` are now available on all
1522 `NonZero` integer types.][84082]
1523 - [`{f32, f64}::from_str` now parse and print special values
1524 (`NaN`, `-0`) according to IEEE 754.][78618]
1525 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1526 - [Add the `BITS` associated constant to all numeric types.][82565]
1530 - [`AtomicBool::fetch_update`]
1531 - [`AtomicPtr::fetch_update`]
1532 - [`BTreeMap::retain`]
1533 - [`BTreeSet::retain`]
1534 - [`BufReader::seek_relative`]
1535 - [`DebugStruct::non_exhaustive`]
1537 - [`Duration::ZERO`]
1538 - [`Duration::is_zero`]
1539 - [`Duration::saturating_add`]
1540 - [`Duration::saturating_mul`]
1541 - [`Duration::saturating_sub`]
1542 - [`ErrorKind::Unsupported`]
1543 - [`Option::insert`]
1544 - [`Ordering::is_eq`]
1545 - [`Ordering::is_ge`]
1546 - [`Ordering::is_gt`]
1547 - [`Ordering::is_le`]
1548 - [`Ordering::is_lt`]
1549 - [`Ordering::is_ne`]
1550 - [`OsStr::is_ascii`]
1551 - [`OsStr::make_ascii_lowercase`]
1552 - [`OsStr::make_ascii_uppercase`]
1553 - [`OsStr::to_ascii_lowercase`]
1554 - [`OsStr::to_ascii_uppercase`]
1555 - [`Peekable::peek_mut`]
1556 - [`Rc::decrement_strong_count`]
1557 - [`Rc::increment_strong_count`]
1558 - [`Vec::extend_from_within`]
1559 - [`array::from_mut`]
1560 - [`array::from_ref`]
1561 - [`cmp::max_by_key`]
1563 - [`cmp::min_by_key`]
1565 - [`f32::is_subnormal`]
1566 - [`f64::is_subnormal`]
1569 -----------------------
1570 - [Cargo now supports git repositories where the default `HEAD` branch is not
1571 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1572 which can handle default branches correctly.
1573 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1574 - [The `authors` field is no longer included in `Cargo.toml` for new
1575 projects.][cargo/9282]
1578 -----------------------
1579 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1580 without hyperlinks.][81764]
1584 - [Implement token-based handling of attributes during expansion][82608]
1585 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1586 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1587 to confusion and potential security vulnerabilities and [is no
1588 longer recommended][ietf6943].
1589 - [The added `BITS` constant may conflict with external definitions.][85667]
1590 In particular, this was known to be a problem in the `lexical-core` crate,
1591 but they have published fixes for semantic versions 0.4 through 0.7. To
1592 update this dependency alone, use `cargo update -p lexical-core`.
1593 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1597 These changes provide no direct user facing benefits, but represent significant
1598 improvements to the internals and overall performance of rustc and
1601 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1602 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1603 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1604 - [Rework rustdoc const type][82873]
1606 [85667]: https://github.com/rust-lang/rust/pull/85667
1607 [83386]: https://github.com/rust-lang/rust/pull/83386
1608 [82771]: https://github.com/rust-lang/rust/pull/82771
1609 [84147]: https://github.com/rust-lang/rust/pull/84147
1610 [84082]: https://github.com/rust-lang/rust/pull/84082
1611 [83799]: https://github.com/rust-lang/rust/pull/83799
1612 [83681]: https://github.com/rust-lang/rust/pull/83681
1613 [83652]: https://github.com/rust-lang/rust/pull/83652
1614 [83387]: https://github.com/rust-lang/rust/pull/83387
1615 [82873]: https://github.com/rust-lang/rust/pull/82873
1616 [82864]: https://github.com/rust-lang/rust/pull/82864
1617 [82608]: https://github.com/rust-lang/rust/pull/82608
1618 [82565]: https://github.com/rust-lang/rust/pull/82565
1619 [80525]: https://github.com/rust-lang/rust/pull/80525
1620 [79278]: https://github.com/rust-lang/rust/pull/79278
1621 [78618]: https://github.com/rust-lang/rust/pull/78618
1622 [77704]: https://github.com/rust-lang/rust/pull/77704
1623 [83941]: https://github.com/rust-lang/rust/pull/83941
1624 [83065]: https://github.com/rust-lang/rust/pull/83065
1625 [81764]: https://github.com/rust-lang/rust/pull/81764
1626 [81469]: https://github.com/rust-lang/rust/pull/81469
1627 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1628 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1629 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1630 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1631 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1632 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1633 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1634 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1635 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1636 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1637 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1638 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1639 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1640 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1641 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1642 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1643 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1644 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1645 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1646 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1647 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1648 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1649 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1650 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1651 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1652 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1653 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1654 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1655 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1656 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1657 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1658 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1659 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1660 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1661 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1662 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1663 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1664 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1665 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1666 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1667 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1670 Version 1.52.1 (2021-05-10)
1671 ============================
1673 This release disables incremental compilation, unless the user has explicitly
1674 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1676 This is due to the widespread, and frequently occurring, breakage encountered by
1677 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1678 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1679 newly added incremental verification are still present in past stable versions,
1680 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1683 These problems only affect incremental builds, so release builds with Cargo
1684 should not be affected unless the user has explicitly opted into incremental.
1685 Debug and check builds are affected.
1687 See [84970] for more details.
1689 [84970]: https://github.com/rust-lang/rust/issues/84970
1691 Version 1.52.0 (2021-05-06)
1692 ============================
1696 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1697 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1698 is allowed by default, and may become a warning or hard error in a
1700 - [You can now cast mutable references to arrays to a pointer of the same type as
1701 the element.][81479]
1705 - [Upgraded the default LLVM to LLVM 12.][81451]
1707 Added tier 3\* support for the following targets.
1709 - [`s390x-unknown-linux-musl`][82166]
1710 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1711 - [`powerpc-unknown-openbsd`][82733]
1713 \* Refer to Rust's [platform support page][platform-support-doc] for more
1714 information on Rust's tiered platform support.
1718 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1719 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1720 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1721 - [All integer division and remainder operations are now `const`.][80962]
1725 - [`Arguments::as_str`]
1727 - [`char::REPLACEMENT_CHARACTER`]
1728 - [`char::UNICODE_VERSION`]
1729 - [`char::decode_utf16`]
1730 - [`char::from_digit`]
1731 - [`char::from_u32_unchecked`]
1732 - [`char::from_u32`]
1733 - [`slice::partition_point`]
1734 - [`str::rsplit_once`]
1735 - [`str::split_once`]
1737 The following previously stable APIs are now `const`.
1739 - [`char::len_utf8`]
1740 - [`char::len_utf16`]
1741 - [`char::to_ascii_uppercase`]
1742 - [`char::to_ascii_lowercase`]
1743 - [`char::eq_ignore_ascii_case`]
1744 - [`u8::to_ascii_uppercase`]
1745 - [`u8::to_ascii_lowercase`]
1746 - [`u8::eq_ignore_ascii_case`]
1750 - [Rustdoc lints are now treated as a tool lint, meaning that
1751 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1752 Using the old style is still allowed, and will become a warning in
1754 - [Rustdoc now supports argument files.][82261]
1755 - [Rustdoc now generates smart punctuation for documentation.][79423]
1756 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1764 - [You can now pass multiple filters to tests.][81356] E.g.
1765 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1766 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1767 allowing you to see `std` symbols when debugging.][82218]
1771 These changes provide no direct user facing benefits, but represent significant
1772 improvements to the internals and overall performance of rustc and
1775 - [Check the result cache before the DepGraph when ensuring queries][81855]
1776 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1777 - [Only store a LocalDefId in some HIR nodes][81611]
1778 - [Store HIR attributes in a side table][79519]
1782 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1783 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1784 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1785 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1786 languages in code blocks.][78429]
1787 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1788 - [Changes in how proc macros handle whitespace may lead to panics when used
1789 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1790 - [Turn `#[derive]` into a regular macro attribute][79078]
1792 [84136]: https://github.com/rust-lang/rust/issues/84136
1793 [80763]: https://github.com/rust-lang/rust/pull/80763
1794 [82166]: https://github.com/rust-lang/rust/pull/82166
1795 [82121]: https://github.com/rust-lang/rust/pull/82121
1796 [81879]: https://github.com/rust-lang/rust/pull/81879
1797 [82261]: https://github.com/rust-lang/rust/pull/82261
1798 [82218]: https://github.com/rust-lang/rust/pull/82218
1799 [82216]: https://github.com/rust-lang/rust/pull/82216
1800 [82202]: https://github.com/rust-lang/rust/pull/82202
1801 [81855]: https://github.com/rust-lang/rust/pull/81855
1802 [81766]: https://github.com/rust-lang/rust/pull/81766
1803 [81744]: https://github.com/rust-lang/rust/pull/81744
1804 [81611]: https://github.com/rust-lang/rust/pull/81611
1805 [81479]: https://github.com/rust-lang/rust/pull/81479
1806 [81451]: https://github.com/rust-lang/rust/pull/81451
1807 [81356]: https://github.com/rust-lang/rust/pull/81356
1808 [80962]: https://github.com/rust-lang/rust/pull/80962
1809 [80553]: https://github.com/rust-lang/rust/pull/80553
1810 [80527]: https://github.com/rust-lang/rust/pull/80527
1811 [79519]: https://github.com/rust-lang/rust/pull/79519
1812 [79423]: https://github.com/rust-lang/rust/pull/79423
1813 [79208]: https://github.com/rust-lang/rust/pull/79208
1814 [78429]: https://github.com/rust-lang/rust/pull/78429
1815 [82733]: https://github.com/rust-lang/rust/pull/82733
1816 [82594]: https://github.com/rust-lang/rust/pull/82594
1817 [79078]: https://github.com/rust-lang/rust/pull/79078
1818 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1819 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1820 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1821 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1822 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1823 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1824 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1825 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1826 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1827 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1828 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1829 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1830 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1831 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1832 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1833 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1834 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1835 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1836 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1837 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1838 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1839 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1841 Version 1.51.0 (2021-03-25)
1842 ============================
1846 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1847 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1848 E.g. you can now write the following. Note: Only values of primitive integers,
1849 `bool`, or `char` types are currently permitted.
1851 struct GenericArray<T, const LENGTH: usize> {
1855 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1856 const fn last(&self) -> Option<&T> {
1860 Some(&self.inner[LENGTH - 1])
1870 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1871 This option controls whether debug information is split across multiple files
1872 or packed into a single file. **Note** This option is unstable on other platforms.
1873 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1874 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1875 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1876 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1878 \* Refer to Rust's [platform support page][platform-support-doc] for more
1879 information on Rust's tiered platform support.
1884 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1885 - [`str` now implements `AsMut<str>`.][80279]
1886 - [`u64` and `u128` now implement `From<char>`.][79502]
1887 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1888 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1889 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1890 - [`io::Empty` now implements `io::Seek`.][78044]
1891 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1892 `T: ?Sized` types.][80764]
1893 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1899 - [`Arc::decrement_strong_count`]
1900 - [`Arc::increment_strong_count`]
1901 - [`Once::call_once_force`]
1902 - [`Peekable::next_if_eq`]
1903 - [`Peekable::next_if`]
1904 - [`Seek::stream_position`]
1905 - [`array::IntoIter`]
1906 - [`panic::panic_any`]
1908 - [`ptr::addr_of_mut!`]
1909 - [`slice::fill_with`]
1910 - [`slice::split_inclusive_mut`]
1911 - [`slice::split_inclusive`]
1912 - [`slice::strip_prefix`]
1913 - [`slice::strip_suffix`]
1914 - [`str::split_inclusive`]
1915 - [`sync::OnceState`]
1917 - [`VecDeque::range`]
1918 - [`VecDeque::range_mut`]
1922 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1923 codegen option.][cargo/9112]
1924 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1925 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1926 to avoid unifying features of dependencies where that unification could be unwanted.
1927 Such as using the same dependency with a `std` feature in a build scripts and
1928 proc-macros, while using the `no-std` feature in the final binary. See the
1929 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1934 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1935 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1936 documentation.][79642]
1938 Various improvements to intra-doc links:
1940 - [You can link to non-path primitives such as `slice`.][80181]
1941 - [You can link to associated items.][74489]
1942 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1946 - [You can now pass `--include-ignored` to tests (e.g. with
1947 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1952 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1953 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1955 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1956 for the distributed artifacts.][81521]
1957 - `armv5te-unknown-linux-gnueabi`
1958 - `sparc64-unknown-linux-gnu`
1959 - `thumbv7neon-unknown-linux-gnueabihf`
1960 - `armv7-unknown-linux-gnueabi`
1961 - `x86_64-unknown-linux-gnux32`
1962 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1967 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1969 [79135]: https://github.com/rust-lang/rust/pull/79135
1970 [74489]: https://github.com/rust-lang/rust/pull/74489
1971 [76934]: https://github.com/rust-lang/rust/pull/76934
1972 [79570]: https://github.com/rust-lang/rust/pull/79570
1973 [80181]: https://github.com/rust-lang/rust/pull/80181
1974 [79642]: https://github.com/rust-lang/rust/pull/79642
1975 [80945]: https://github.com/rust-lang/rust/pull/80945
1976 [80279]: https://github.com/rust-lang/rust/pull/80279
1977 [80053]: https://github.com/rust-lang/rust/pull/80053
1978 [79502]: https://github.com/rust-lang/rust/pull/79502
1979 [75180]: https://github.com/rust-lang/rust/pull/75180
1980 [81521]: https://github.com/rust-lang/rust/pull/81521
1981 [80968]: https://github.com/rust-lang/rust/pull/80968
1982 [80959]: https://github.com/rust-lang/rust/pull/80959
1983 [80718]: https://github.com/rust-lang/rust/pull/80718
1984 [80653]: https://github.com/rust-lang/rust/pull/80653
1985 [80579]: https://github.com/rust-lang/rust/pull/80579
1986 [79998]: https://github.com/rust-lang/rust/pull/79998
1987 [78044]: https://github.com/rust-lang/rust/pull/78044
1988 [81455]: https://github.com/rust-lang/rust/pull/81455
1989 [80764]: https://github.com/rust-lang/rust/pull/80764
1990 [80749]: https://github.com/rust-lang/rust/pull/80749
1991 [80662]: https://github.com/rust-lang/rust/pull/80662
1992 [79134]: https://github.com/rust-lang/rust/pull/79134
1993 [80966]: https://github.com/rust-lang/rust/pull/80966
1994 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1995 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1996 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1997 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1998 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1999 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
2000 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2001 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
2002 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
2003 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
2004 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
2005 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
2006 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
2007 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
2008 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
2009 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
2010 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
2011 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
2012 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
2013 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
2014 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
2015 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
2016 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
2018 Version 1.50.0 (2021-02-11)
2019 ============================
2022 -----------------------
2023 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
2024 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
2025 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
2028 -----------------------
2029 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
2030 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
2031 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
2032 - [Dropped support for all cloudabi targets.][78439]
2034 \* Refer to Rust's [platform support page][platform-support-doc] for more
2035 information on Rust's tiered platform support.
2038 -----------------------
2040 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
2041 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
2042 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
2043 This value cannot be a valid file descriptor, and now means `Option<File>` takes
2044 up the same amount of space as `File`.
2050 - [`btree_map::Entry::or_insert_with_key`]
2053 - [`hash_map::Entry::or_insert_with_key`]
2057 - [`UnsafeCell::get_mut`]
2059 The following previously stable methods are now `const`.
2061 - [`IpAddr::is_ipv4`]
2062 - [`IpAddr::is_ipv6`]
2063 - [`IpAddr::is_unspecified`]
2064 - [`IpAddr::is_loopback`]
2065 - [`IpAddr::is_multicast`]
2066 - [`Ipv4Addr::octets`]
2067 - [`Ipv4Addr::is_loopback`]
2068 - [`Ipv4Addr::is_private`]
2069 - [`Ipv4Addr::is_link_local`]
2070 - [`Ipv4Addr::is_multicast`]
2071 - [`Ipv4Addr::is_broadcast`]
2072 - [`Ipv4Addr::is_documentation`]
2073 - [`Ipv4Addr::to_ipv6_compatible`]
2074 - [`Ipv4Addr::to_ipv6_mapped`]
2075 - [`Ipv6Addr::segments`]
2076 - [`Ipv6Addr::is_unspecified`]
2077 - [`Ipv6Addr::is_loopback`]
2078 - [`Ipv6Addr::is_multicast`]
2079 - [`Ipv6Addr::to_ipv4`]
2082 - [`Layout::from_size_align`]
2083 - `pow` for all integer types.
2084 - `checked_pow` for all integer types.
2085 - `saturating_pow` for all integer types.
2086 - `wrapping_pow` for all integer types.
2087 - `next_power_of_two` for all unsigned integer types.
2088 - `checked_next_power_of_two` for all unsigned integer types.
2091 -----------------------
2093 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
2094 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
2095 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
2096 contents of that directory for changes.][cargo/8973]
2097 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
2102 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
2103 - [Running tests will now print the total time taken to execute.][75752]
2108 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
2109 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
2110 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
2111 unhygenic `macro_rules!` macros.][79472]
2112 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
2113 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
2114 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
2115 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
2116 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
2117 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
2119 [74989]: https://github.com/rust-lang/rust/pull/74989
2120 [79261]: https://github.com/rust-lang/rust/pull/79261
2121 [79896]: https://github.com/rust-lang/rust/pull/79896
2122 [79484]: https://github.com/rust-lang/rust/pull/79484
2123 [79472]: https://github.com/rust-lang/rust/pull/79472
2124 [79270]: https://github.com/rust-lang/rust/pull/79270
2125 [79003]: https://github.com/rust-lang/rust/pull/79003
2126 [78864]: https://github.com/rust-lang/rust/pull/78864
2127 [78636]: https://github.com/rust-lang/rust/pull/78636
2128 [78439]: https://github.com/rust-lang/rust/pull/78439
2129 [78343]: https://github.com/rust-lang/rust/pull/78343
2130 [78296]: https://github.com/rust-lang/rust/pull/78296
2131 [78068]: https://github.com/rust-lang/rust/pull/78068
2132 [75752]: https://github.com/rust-lang/rust/pull/75752
2133 [74699]: https://github.com/rust-lang/rust/pull/74699
2134 [78142]: https://github.com/rust-lang/rust/pull/78142
2135 [77484]: https://github.com/rust-lang/rust/pull/77484
2136 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
2137 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
2138 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
2139 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
2140 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
2141 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
2142 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
2143 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
2144 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
2145 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
2146 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
2147 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
2148 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
2149 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
2150 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
2151 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
2152 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
2153 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
2154 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
2155 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
2156 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
2157 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
2158 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
2159 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
2160 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
2161 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
2162 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
2163 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
2164 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
2165 [`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
2166 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
2167 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
2168 [`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
2169 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
2172 Version 1.49.0 (2020-12-31)
2173 ============================
2176 -----------------------
2178 - [Unions can now implement `Drop`, and you can now have a field in a union
2179 with `ManuallyDrop<T>`.][77547]
2180 - [You can now cast uninhabited enums to integers.][76199]
2181 - [You can now bind by reference and by move in patterns.][76119] This
2182 allows you to selectively borrow individual components of a type. E.g.
2190 let person = Person {
2191 name: String::from("Alice"),
2195 // `name` is moved out of person, but `age` is referenced.
2196 let Person { name, ref age } = person;
2197 println!("{} {}", name, age);
2201 -----------------------
2203 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2204 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2205 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2206 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2207 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2208 - [Output from threads spawned in tests is now captured.][78227]
2209 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2211 \* Refer to Rust's [platform support page][platform-support-doc] for more
2212 information on Rust's tiered platform support.
2215 -----------------------
2217 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2218 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2223 - [`slice::select_nth_unstable`]
2224 - [`slice::select_nth_unstable_by`]
2225 - [`slice::select_nth_unstable_by_key`]
2227 The following previously stable methods are now `const`.
2229 - [`Poll::is_ready`]
2230 - [`Poll::is_pending`]
2233 -----------------------
2234 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2235 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2236 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2237 variable will be set if the crate being built is one the user selected to build, either
2238 with `-p` or through defaults.
2239 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2245 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2246 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2247 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2248 Previously such invalid or unused attributes could be ignored.
2249 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2250 read [this post about the changes][rustdoc-ws-post] for more details.
2251 - [Trait bounds are no longer inferred for associated types.][79904]
2255 These changes provide no direct user facing benefits, but represent significant
2256 improvements to the internals and overall performance of rustc and
2259 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2260 Local Storage model.][78201]
2261 - [Calculate visibilities once in resolve.][78077]
2262 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2263 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2266 [75991]: https://github.com/rust-lang/rust/pull/75991
2267 [78951]: https://github.com/rust-lang/rust/pull/78951
2268 [78848]: https://github.com/rust-lang/rust/pull/78848
2269 [78746]: https://github.com/rust-lang/rust/pull/78746
2270 [78376]: https://github.com/rust-lang/rust/pull/78376
2271 [78228]: https://github.com/rust-lang/rust/pull/78228
2272 [78227]: https://github.com/rust-lang/rust/pull/78227
2273 [78201]: https://github.com/rust-lang/rust/pull/78201
2274 [78109]: https://github.com/rust-lang/rust/pull/78109
2275 [78077]: https://github.com/rust-lang/rust/pull/78077
2276 [77997]: https://github.com/rust-lang/rust/pull/77997
2277 [77703]: https://github.com/rust-lang/rust/pull/77703
2278 [77547]: https://github.com/rust-lang/rust/pull/77547
2279 [77015]: https://github.com/rust-lang/rust/pull/77015
2280 [76199]: https://github.com/rust-lang/rust/pull/76199
2281 [76119]: https://github.com/rust-lang/rust/pull/76119
2282 [75914]: https://github.com/rust-lang/rust/pull/75914
2283 [79004]: https://github.com/rust-lang/rust/pull/79004
2284 [78676]: https://github.com/rust-lang/rust/pull/78676
2285 [79904]: https://github.com/rust-lang/rust/issues/79904
2286 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2287 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2288 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2289 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2290 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2291 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2292 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2293 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2294 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2295 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2297 Version 1.48.0 (2020-11-19)
2298 ==========================
2303 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2304 is still rejected *semantically*, but can now be parsed by procedural macros.
2308 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2309 `rustc` whether to link its own C runtime and libraries or to rely on a external
2310 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2311 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2312 Note: If you're using cargo you must explicitly pass the `--target` flag.
2313 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2315 \* Refer to Rust's [platform support page][platform-support-doc] for more
2316 information on Rust's tiered platform support.
2320 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2321 and `&Stderr`.][76275]
2322 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2323 - [The `matches!` macro now supports having a trailing comma.][74880]
2324 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2325 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2329 - [`slice::as_ptr_range`]
2330 - [`slice::as_mut_ptr_range`]
2331 - [`VecDeque::make_contiguous`]
2332 - [`future::pending`]
2335 The following previously stable methods are now `const fn`'s:
2337 - [`Option::is_some`]
2338 - [`Option::is_none`]
2339 - [`Option::as_ref`]
2341 - [`Result::is_err`]
2342 - [`Result::as_ref`]
2343 - [`Ordering::reverse`]
2344 - [`Ordering::then`]
2351 - [You can now link to items in `rustdoc` using the intra-doc link
2352 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2353 a link to `std::future`'s documentation. See ["Linking to items by
2354 name"][intradoc-links] for more information.
2355 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2356 when searching through `rustdoc`'s UI.][75740]
2360 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2361 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2362 promoted to `'static` lifetime any more inside `const fn`s.
2363 - [Associated type bindings on trait objects are now verified to meet the bounds
2364 declared on the trait when checking that they implement the trait.][27675]
2365 - [When trait bounds on associated types or opaque types are ambiguous, the
2366 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2367 - [Fixed recursive nonterminals not being expanded in macros during
2368 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2369 correctly handling recursive nonterminal tokens.
2370 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2371 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2372 in places where they have no effect.][73461]
2373 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2374 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2375 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2376 disallow zero-initialization.][71274]
2377 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2378 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2379 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2380 see the [`catch_unwind`] documentation for further information.
2386 These changes provide no direct user facing benefits, but represent significant
2387 improvements to the internals and overall performance of rustc and
2390 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2391 You can continue building with `make` by setting `ninja=false` in
2393 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2394 - [Made `ensure_sufficient_stack()` non-generic][76680]
2396 [78143]: https://github.com/rust-lang/rust/issues/78143
2397 [76680]: https://github.com/rust-lang/rust/pull/76680/
2398 [76030]: https://github.com/rust-lang/rust/pull/76030/
2399 [70212]: https://github.com/rust-lang/rust/pull/70212/
2400 [27675]: https://github.com/rust-lang/rust/issues/27675/
2401 [54121]: https://github.com/rust-lang/rust/issues/54121/
2402 [71274]: https://github.com/rust-lang/rust/pull/71274/
2403 [77386]: https://github.com/rust-lang/rust/pull/77386/
2404 [77153]: https://github.com/rust-lang/rust/pull/77153/
2405 [77055]: https://github.com/rust-lang/rust/pull/77055/
2406 [76275]: https://github.com/rust-lang/rust/pull/76275/
2407 [76310]: https://github.com/rust-lang/rust/pull/76310/
2408 [76420]: https://github.com/rust-lang/rust/pull/76420/
2409 [76158]: https://github.com/rust-lang/rust/pull/76158/
2410 [75857]: https://github.com/rust-lang/rust/pull/75857/
2411 [75585]: https://github.com/rust-lang/rust/pull/75585/
2412 [75740]: https://github.com/rust-lang/rust/pull/75740/
2413 [75502]: https://github.com/rust-lang/rust/pull/75502/
2414 [74880]: https://github.com/rust-lang/rust/pull/74880/
2415 [74922]: https://github.com/rust-lang/rust/pull/74922/
2416 [74430]: https://github.com/rust-lang/rust/pull/74430/
2417 [74194]: https://github.com/rust-lang/rust/pull/74194/
2418 [73461]: https://github.com/rust-lang/rust/pull/73461/
2419 [73166]: https://github.com/rust-lang/rust/pull/73166/
2420 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2421 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2422 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2423 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2424 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2425 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2426 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2427 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2428 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2429 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2430 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2431 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2432 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2433 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2434 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2437 Version 1.47.0 (2020-10-08)
2438 ==========================
2442 - [Closures will now warn when not used.][74869]
2446 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2447 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2449 - [Upgraded to LLVM 11.][73526]
2450 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2451 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2452 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2454 \* Refer to Rust's [platform support page][platform-support-doc] for more
2455 information on Rust's tiered platform support.
2459 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2460 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2461 those of length less than 33.][74060]
2462 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2463 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2464 `PartialEq`, and `PartialOrd`.][73583]
2468 - [`Ident::new_raw`]
2469 - [`Range::is_empty`]
2470 - [`RangeInclusive::is_empty`]
2471 - [`Result::as_deref`]
2472 - [`Result::as_deref_mut`]
2474 - [`pointer::offset_from`]
2478 The following previously stable APIs have now been made const.
2480 - [The `new` method for all `NonZero` integers.][73858]
2481 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2482 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2483 methods for all integers.][73858]
2484 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2485 signed integers.][73858]
2486 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2487 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2488 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2489 `is_ascii_control` methods for `char` and `u8`.][73858]
2493 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2494 You can override this by setting the following in your `Cargo.toml`.
2496 [profile.release.build-override]
2499 - [`cargo-help` will now display man pages for commands rather just the
2500 `--help` text.][cargo/8456]
2501 - [`cargo-metadata` now emits a `test` field indicating if a target has
2502 tests enabled.][cargo/8478]
2503 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2504 - [`cargo-publish` will now use an alternative registry by default if it's the
2505 only registry specified in `package.publish`.][cargo/8571]
2509 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2510 type based search.][75366]
2511 - [Added the Ayu theme to rustdoc.][71237]
2515 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2516 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2517 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2518 help to preserve more span information.][73084] These changes may cause
2519 compiliation errors if your macro was unhygenic or didn't correctly handle
2521 - [Moved support for the CloudABI target to tier 3.][75568]
2522 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2523 - [Added the `rustc-docs` component.][75560] This allows you to install
2524 and read the documentation for the compiler internal APIs. (Currently only
2525 available for `x86_64-unknown-linux-gnu`.)
2530 - [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.
2532 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2533 [75048]: https://github.com/rust-lang/rust/pull/75048/
2534 [74163]: https://github.com/rust-lang/rust/pull/74163/
2535 [71237]: https://github.com/rust-lang/rust/pull/71237/
2536 [74869]: https://github.com/rust-lang/rust/pull/74869/
2537 [73858]: https://github.com/rust-lang/rust/pull/73858/
2538 [75716]: https://github.com/rust-lang/rust/pull/75716/
2539 [75560]: https://github.com/rust-lang/rust/pull/75560/
2540 [75568]: https://github.com/rust-lang/rust/pull/75568/
2541 [75366]: https://github.com/rust-lang/rust/pull/75366/
2542 [75204]: https://github.com/rust-lang/rust/pull/75204/
2543 [74650]: https://github.com/rust-lang/rust/pull/74650/
2544 [74419]: https://github.com/rust-lang/rust/pull/74419/
2545 [73964]: https://github.com/rust-lang/rust/pull/73964/
2546 [74021]: https://github.com/rust-lang/rust/pull/74021/
2547 [74060]: https://github.com/rust-lang/rust/pull/74060/
2548 [73893]: https://github.com/rust-lang/rust/pull/73893/
2549 [73526]: https://github.com/rust-lang/rust/pull/73526/
2550 [73583]: https://github.com/rust-lang/rust/pull/73583/
2551 [73084]: https://github.com/rust-lang/rust/pull/73084/
2552 [73197]: https://github.com/rust-lang/rust/pull/73197/
2553 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2554 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2555 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2556 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2557 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2558 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2559 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2560 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2561 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2562 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2563 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2564 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2565 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2566 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2569 Version 1.46.0 (2020-08-27)
2570 ==========================
2574 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2575 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2576 const functions.][73862]
2577 - [The `#[track_caller]` attribute can now be added to functions to use the
2578 function's caller's location information for panic messages.][72445]
2579 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2580 `x.0.0` over `(x.0).0`.
2581 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2582 You currently can't use `mem::transmute` in constant functions.
2586 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2587 - [Enabled static "Position Independent Executables" by default
2588 for `x86_64-unknown-linux-musl`.][70740]
2592 - [`mem::forget` is now a `const fn`.][73887]
2593 - [`String` now implements `From<char>`.][73466]
2594 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2595 integer types.][73032]
2596 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2597 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2598 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2599 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2600 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2601 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2606 - [`vec::Drain::as_slice`]
2610 Added a number of new environment variables that are now available when
2611 compiling your crate.
2613 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2614 the specific binary being compiled and the name of the crate.
2615 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2616 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2620 - [The target configuration option `abi_blacklist` has been renamed
2621 to `unsupported_abis`.][74150] The old name will still continue to work.
2622 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2623 This was previously accepted but will become a hard error in a future release.
2624 - [Rustc will fail to compile if you have a struct with
2625 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2627 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2628 ensure that spans have the correct information, and may cause breakage if you
2629 were relying on receiving spans with dummy information.
2630 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2631 a legacy installer that was replaced by a MSI installer a few years ago but
2632 was still being built.
2633 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2634 - [Rustc will no longer accept overlapping trait implementations that only
2635 differ in how the lifetime was bound.][72493]
2636 - [Rustc now correctly relates the lifetime of an existential associated
2637 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2638 you to pass a shorter lifetime than expected.
2639 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2640 The library will need to be installed for `rustc` to work, even though we
2641 expect it to be already available on most systems.
2642 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2644 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2645 exact output returned by rustc's pretty printing is an unstable
2646 implementation detail: we recommend any macro relying on it to switch to a
2647 more robust parsing system.
2649 [75453]: https://github.com/rust-lang/rust/issues/75453/
2650 [74820]: https://github.com/rust-lang/rust/issues/74820/
2651 [74420]: https://github.com/rust-lang/rust/issues/74420/
2652 [74109]: https://github.com/rust-lang/rust/pull/74109/
2653 [74150]: https://github.com/rust-lang/rust/pull/74150/
2654 [73862]: https://github.com/rust-lang/rust/pull/73862/
2655 [73887]: https://github.com/rust-lang/rust/pull/73887/
2656 [73466]: https://github.com/rust-lang/rust/pull/73466/
2657 [73516]: https://github.com/rust-lang/rust/pull/73516/
2658 [73293]: https://github.com/rust-lang/rust/pull/73293/
2659 [73007]: https://github.com/rust-lang/rust/pull/73007/
2660 [73032]: https://github.com/rust-lang/rust/pull/73032/
2661 [72920]: https://github.com/rust-lang/rust/pull/72920/
2662 [72569]: https://github.com/rust-lang/rust/pull/72569/
2663 [72583]: https://github.com/rust-lang/rust/pull/72583/
2664 [72584]: https://github.com/rust-lang/rust/pull/72584/
2665 [72717]: https://github.com/rust-lang/rust/pull/72717/
2666 [72437]: https://github.com/rust-lang/rust/pull/72437/
2667 [72445]: https://github.com/rust-lang/rust/pull/72445/
2668 [72486]: https://github.com/rust-lang/rust/pull/72486/
2669 [72493]: https://github.com/rust-lang/rust/pull/72493/
2670 [72331]: https://github.com/rust-lang/rust/pull/72331/
2671 [71896]: https://github.com/rust-lang/rust/pull/71896/
2672 [71660]: https://github.com/rust-lang/rust/pull/71660/
2673 [71322]: https://github.com/rust-lang/rust/pull/71322/
2674 [70740]: https://github.com/rust-lang/rust/pull/70740/
2675 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2676 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2677 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2678 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2679 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2682 Version 1.45.2 (2020-08-03)
2683 ==========================
2685 * [Fix bindings in tuple struct patterns][74954]
2686 * [Fix track_caller integration with trait objects][74784]
2688 [74954]: https://github.com/rust-lang/rust/issues/74954
2689 [74784]: https://github.com/rust-lang/rust/issues/74784
2692 Version 1.45.1 (2020-07-30)
2693 ==========================
2695 * [Fix const propagation with references.][73613]
2696 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2697 * [Avoid spurious implicit region bound.][74509]
2698 * [Install clippy on x.py install][74457]
2700 [73613]: https://github.com/rust-lang/rust/pull/73613
2701 [73078]: https://github.com/rust-lang/rust/issues/73078
2702 [74509]: https://github.com/rust-lang/rust/pull/74509
2703 [74457]: https://github.com/rust-lang/rust/pull/74457
2706 Version 1.45.0 (2020-07-16)
2707 ==========================
2711 - [Out of range float to int conversions using `as` has been defined as a saturating
2712 conversion.][71269] This was previously undefined behaviour, but you can use the
2713 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2714 may be desirable in rare performance sensitive situations.
2715 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2716 using `u64`.][70705]
2717 - [Function like procedural macros can now be used in expression, pattern, and statement
2718 positions.][68717] This means you can now use a function-like procedural macro
2719 anywhere you can use a declarative (`macro_rules!`) macro.
2723 - [You can now override individual target features through the `target-feature`
2724 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2725 equivalent to `-C target-feature=+avx2,+fma`.
2726 - [Added the `force-unwind-tables` flag.][69984] This option allows
2727 rustc to always generate unwind tables regardless of panic strategy.
2728 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2729 to include LLVM bitcode into generated `rlib`s (this is on by default).
2730 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2731 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2732 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2733 - [Upgraded to LLVM 10.][67759]
2735 \* Refer to Rust's [platform support page][platform-support-doc] for more
2736 information on Rust's tiered platform support.
2741 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2743 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2744 - [You can now use `char` with
2745 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2746 a range of codepoints.][72413] E.g.
2747 you can now write the following;
2749 for ch in 'a'..='z' {
2753 // Prints "abcdefghijklmnopqrstuvwxyz"
2755 - [`OsString` now implements `FromStr`.][71662]
2756 - [The `saturating_neg` method has been added to all signed integer primitive
2757 types, and the `saturating_abs` method has been added for all integer
2758 primitive types.][71886]
2759 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2760 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2762 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2763 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2764 integer types.][69813]
2765 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2766 integer types.][72324]
2767 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2772 - [`BTreeMap::remove_entry`]
2774 - [`rc::Weak::as_ptr`]
2775 - [`rc::Weak::from_raw`]
2776 - [`rc::Weak::into_raw`]
2777 - [`str::strip_prefix`]
2778 - [`str::strip_suffix`]
2779 - [`sync::Weak::as_ptr`]
2780 - [`sync::Weak::from_raw`]
2781 - [`sync::Weak::into_raw`]
2782 - [`char::UNICODE_VERSION`]
2783 - [`Span::resolved_at`]
2784 - [`Span::located_at`]
2785 - [`Span::mixed_site`]
2786 - [`unix::process::CommandExt::arg0`]
2791 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2796 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2797 `~~outdated information~~` becomes "~~outdated information~~".
2798 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2802 - [Trying to self initialize a static value (that is creating a value using
2803 itself) is unsound and now causes a compile error.][71140]
2804 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2805 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2806 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2807 previously undocumented and not intended for public use. Rustdoc still provides
2808 a non-zero exit code on errors.
2809 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2810 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2811 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2812 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2813 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2817 - [Make clippy a git subtree instead of a git submodule][70655]
2818 - [Unify the undo log of all snapshot types][69464]
2820 [71848]: https://github.com/rust-lang/rust/issues/71848/
2821 [73420]: https://github.com/rust-lang/rust/issues/73420/
2822 [72324]: https://github.com/rust-lang/rust/pull/72324/
2823 [71843]: https://github.com/rust-lang/rust/pull/71843/
2824 [71886]: https://github.com/rust-lang/rust/pull/71886/
2825 [72234]: https://github.com/rust-lang/rust/pull/72234/
2826 [72239]: https://github.com/rust-lang/rust/pull/72239/
2827 [72397]: https://github.com/rust-lang/rust/pull/72397/
2828 [72413]: https://github.com/rust-lang/rust/pull/72413/
2829 [72014]: https://github.com/rust-lang/rust/pull/72014/
2830 [72062]: https://github.com/rust-lang/rust/pull/72062/
2831 [72094]: https://github.com/rust-lang/rust/pull/72094/
2832 [72133]: https://github.com/rust-lang/rust/pull/72133/
2833 [67759]: https://github.com/rust-lang/rust/pull/67759/
2834 [71900]: https://github.com/rust-lang/rust/pull/71900/
2835 [71928]: https://github.com/rust-lang/rust/pull/71928/
2836 [71662]: https://github.com/rust-lang/rust/pull/71662/
2837 [71716]: https://github.com/rust-lang/rust/pull/71716/
2838 [71447]: https://github.com/rust-lang/rust/pull/71447/
2839 [71269]: https://github.com/rust-lang/rust/pull/71269/
2840 [71095]: https://github.com/rust-lang/rust/pull/71095/
2841 [71140]: https://github.com/rust-lang/rust/pull/71140/
2842 [70655]: https://github.com/rust-lang/rust/pull/70655/
2843 [70705]: https://github.com/rust-lang/rust/pull/70705/
2844 [69984]: https://github.com/rust-lang/rust/pull/69984/
2845 [69813]: https://github.com/rust-lang/rust/pull/69813/
2846 [69464]: https://github.com/rust-lang/rust/pull/69464/
2847 [68717]: https://github.com/rust-lang/rust/pull/68717/
2848 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2849 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2850 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2851 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2852 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2853 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2854 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2855 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2856 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2857 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2858 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2859 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2860 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2861 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2862 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2863 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2864 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2867 Version 1.44.1 (2020-06-18)
2868 ===========================
2870 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2871 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2872 * [Fix crashes when finding backtrace on macOS.][71397]
2873 * [Clippy applies lint levels into different files.][clippy/5356]
2875 [71397]: https://github.com/rust-lang/rust/issues/71397
2876 [73078]: https://github.com/rust-lang/rust/issues/73078
2877 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2878 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2881 Version 1.44.0 (2020-06-04)
2882 ==========================
2886 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2887 - [Added the `unused_braces` lint.][70081]
2889 **Syntax-only changes**
2891 - [Expansion-driven outline module parsing][69838]
2896 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2901 These are still rejected semantically, so you will likely receive an error but
2902 these changes can be seen and parsed by macros and conditional compilation.
2906 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2907 Additionally when in incremental mode rustc defaults to 256 codegen units.
2908 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2909 a panic is thrown.][67502]
2910 - [Added tier 3\* support for the `aarch64-unknown-none` and
2911 `aarch64-unknown-none-softfloat` targets.][68334]
2912 - [Added tier 3 support for `arm64-apple-tvos` and
2913 `x86_64-apple-tvos` targets.][68191]
2918 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2919 `vec![]` to be able to be used in `const` contexts.
2920 - [`convert::Infallible` now implements `Hash`.][70281]
2921 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2922 a `&mut OsStr`.][70048]
2923 - [Unicode 13 is now supported.][69929]
2924 - [`String` now implements `From<&mut str>`.][69661]
2925 - [`IoSlice` now implements `Copy`.][69403]
2926 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2927 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2928 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2929 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2930 integer types.][69373]
2934 - [`PathBuf::with_capacity`]
2935 - [`PathBuf::capacity`]
2936 - [`PathBuf::clear`]
2937 - [`PathBuf::reserve`]
2938 - [`PathBuf::reserve_exact`]
2939 - [`PathBuf::shrink_to_fit`]
2940 - [`f32::to_int_unchecked`]
2941 - [`f64::to_int_unchecked`]
2942 - [`Layout::align_to`]
2943 - [`Layout::pad_to_align`]
2945 - [`Layout::extend`]
2949 - [Added the `cargo tree` command which will print a tree graph of
2950 your dependencies.][cargo/8062] E.g.
2952 mdbook v0.3.2 (/Users/src/rust/mdbook)
2954 │ ├── html5ever v0.24.0
2956 │ │ │ └── cfg-if v0.1.9
2958 │ │ └── markup5ever v0.9.0
2959 │ │ ├── log v0.4.8 (*)
2961 │ │ │ └── phf_shared v0.7.24
2962 │ │ │ ├── siphasher v0.2.3
2963 │ │ │ └── unicase v1.4.2
2964 │ │ │ [build-dependencies]
2965 │ │ │ └── version_check v0.1.5
2968 You can also display dependencies on multiple versions of the same crate with
2969 `cargo tree -d` (short for `cargo tree --duplicates`).
2973 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2974 the version in the sidebar.][69494]
2978 - [Rustc now correctly generates static libraries on Windows GNU targets with
2979 the `.a` extension, rather than the previous `.lib`.][70937]
2980 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2981 - [The `file_name` property in JSON output of macro errors now points the actual
2982 source file rather than the previous format of `<NAME macros>`.][70969]
2983 **Note:** this may not point to a file that actually exists on the user's system.
2984 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2985 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2986 not allow zero initialization such as `NonZeroU8`.][66059] This was
2987 previously a warning.
2988 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2989 operator has been defined as a saturating operation.][71269] This was previously
2990 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2991 continue using the current behaviour, which may be desirable in rare performance
2992 sensitive situations.
2996 These changes provide no direct user facing benefits, but represent significant
2997 improvements to the internals and overall performance of rustc and
3000 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
3001 - [Replace big JS dict with JSON parsing.][71250]
3003 [69373]: https://github.com/rust-lang/rust/pull/69373/
3004 [66059]: https://github.com/rust-lang/rust/pull/66059/
3005 [68191]: https://github.com/rust-lang/rust/pull/68191/
3006 [68899]: https://github.com/rust-lang/rust/pull/68899/
3007 [71147]: https://github.com/rust-lang/rust/pull/71147/
3008 [71250]: https://github.com/rust-lang/rust/pull/71250/
3009 [70937]: https://github.com/rust-lang/rust/pull/70937/
3010 [70969]: https://github.com/rust-lang/rust/pull/70969/
3011 [70632]: https://github.com/rust-lang/rust/pull/70632/
3012 [70281]: https://github.com/rust-lang/rust/pull/70281/
3013 [70345]: https://github.com/rust-lang/rust/pull/70345/
3014 [70048]: https://github.com/rust-lang/rust/pull/70048/
3015 [70081]: https://github.com/rust-lang/rust/pull/70081/
3016 [70156]: https://github.com/rust-lang/rust/pull/70156/
3017 [71269]: https://github.com/rust-lang/rust/pull/71269/
3018 [69838]: https://github.com/rust-lang/rust/pull/69838/
3019 [69929]: https://github.com/rust-lang/rust/pull/69929/
3020 [69661]: https://github.com/rust-lang/rust/pull/69661/
3021 [69778]: https://github.com/rust-lang/rust/pull/69778/
3022 [69494]: https://github.com/rust-lang/rust/pull/69494/
3023 [69403]: https://github.com/rust-lang/rust/pull/69403/
3024 [69033]: https://github.com/rust-lang/rust/pull/69033/
3025 [68692]: https://github.com/rust-lang/rust/pull/68692/
3026 [68334]: https://github.com/rust-lang/rust/pull/68334/
3027 [67502]: https://github.com/rust-lang/rust/pull/67502/
3028 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
3029 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
3030 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
3031 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
3032 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
3033 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
3034 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
3035 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
3036 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
3037 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
3038 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
3039 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
3040 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
3043 Version 1.43.1 (2020-05-07)
3044 ===========================
3046 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
3047 * [Fixed the stabilization of AVX-512 features.][71473]
3048 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
3050 [71430]: https://github.com/rust-lang/rust/pull/71430
3051 [71473]: https://github.com/rust-lang/rust/issues/71473
3052 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
3055 Version 1.43.0 (2020-04-23)
3056 ==========================
3060 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
3061 the type inferred correctly.][68129]
3062 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
3064 **Syntax only changes**
3065 - [Allow `type Foo: Ord` syntactically.][69361]
3066 - [Fuse associated and extern items up to defaultness.][69194]
3067 - [Syntactically allow `self` in all `fn` contexts.][68764]
3068 - [Merge `fn` syntax + cleanup item parsing.][68728]
3069 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
3070 For example, you may now write:
3072 macro_rules! mac_trait {
3082 These are still rejected *semantically*, so you will likely receive an error but
3083 these changes can be seen and parsed by macros and
3084 conditional compilation.
3089 - [You can now pass multiple lint flags to rustc to override the previous
3090 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
3091 everything in the `unused` lint group except `unused-variables` which
3092 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
3093 everything in the `unused` lint group **including** `unused-variables` since
3094 the allow flag is specified before the deny flag (and therefore overridden).
3095 - [rustc will now prefer your system MinGW libraries over its bundled libraries
3096 if they are available on `windows-gnu`.][67429]
3097 - [rustc now buffers errors/warnings printed in JSON.][69227]
3101 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
3102 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
3103 respectively.][69538] **Note** These conversions are only available when `N`
3105 - [You can now use associated constants on floats and integers directly, rather
3106 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
3107 `f32::NAN` with no imports.
3108 - [`u8::is_ascii` is now `const`.][68984]
3109 - [`String` now implements `AsMut<str>`.][68742]
3110 - [Added the `primitive` module to `std` and `core`.][67637] This module
3111 reexports Rust's primitive types. This is mainly useful in macros
3112 where you want avoid these types being shadowed.
3113 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
3114 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
3118 - [`Once::is_completed`]
3123 - [`iter::once_with`]
3127 - [You can now set config `[profile]`s in your `.cargo/config`, or through
3128 your environment.][cargo/7823]
3129 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
3130 executable path when running integration tests or benchmarks.][cargo/7697]
3131 `<name>` is the name of your binary as-is e.g. If you wanted the executable
3132 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
3136 - [Certain checks in the `const_err` lint were deemed unrelated to const
3137 evaluation][69185], and have been moved to the `unconditional_panic` and
3138 `arithmetic_overflow` lints.
3143 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
3144 has been a warning since 1.36.0.
3145 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
3146 led to some instances being accepted, and now correctly emits a hard error.
3148 [69340]: https://github.com/rust-lang/rust/pull/69340
3152 These changes provide no direct user facing benefits, but represent significant
3153 improvements to the internals and overall performance of `rustc` and
3156 - [All components are now built with `opt-level=3` instead of `2`.][67878]
3157 - [Improved how rustc generates drop code.][67332]
3158 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
3159 - [traits: preallocate 2 Vecs of known initial size][69022]
3160 - [Avoid exponential behaviour when relating types][68772]
3161 - [Skip `Drop` terminators for enum variants without drop glue][68943]
3162 - [Improve performance of coherence checks][68966]
3163 - [Deduplicate types in the generator witness][68672]
3164 - [Invert control in struct_lint_level.][68725]
3166 [67332]: https://github.com/rust-lang/rust/pull/67332/
3167 [67429]: https://github.com/rust-lang/rust/pull/67429/
3168 [67637]: https://github.com/rust-lang/rust/pull/67637/
3169 [67642]: https://github.com/rust-lang/rust/pull/67642/
3170 [67878]: https://github.com/rust-lang/rust/pull/67878/
3171 [67885]: https://github.com/rust-lang/rust/pull/67885/
3172 [68129]: https://github.com/rust-lang/rust/pull/68129/
3173 [68672]: https://github.com/rust-lang/rust/pull/68672/
3174 [68725]: https://github.com/rust-lang/rust/pull/68725/
3175 [68728]: https://github.com/rust-lang/rust/pull/68728/
3176 [68738]: https://github.com/rust-lang/rust/pull/68738/
3177 [68742]: https://github.com/rust-lang/rust/pull/68742/
3178 [68764]: https://github.com/rust-lang/rust/pull/68764/
3179 [68772]: https://github.com/rust-lang/rust/pull/68772/
3180 [68943]: https://github.com/rust-lang/rust/pull/68943/
3181 [68952]: https://github.com/rust-lang/rust/pull/68952/
3182 [68966]: https://github.com/rust-lang/rust/pull/68966/
3183 [68984]: https://github.com/rust-lang/rust/pull/68984/
3184 [69022]: https://github.com/rust-lang/rust/pull/69022/
3185 [69185]: https://github.com/rust-lang/rust/pull/69185/
3186 [69194]: https://github.com/rust-lang/rust/pull/69194/
3187 [69201]: https://github.com/rust-lang/rust/pull/69201/
3188 [69227]: https://github.com/rust-lang/rust/pull/69227/
3189 [69548]: https://github.com/rust-lang/rust/pull/69548/
3190 [69256]: https://github.com/rust-lang/rust/pull/69256/
3191 [69361]: https://github.com/rust-lang/rust/pull/69361/
3192 [69366]: https://github.com/rust-lang/rust/pull/69366/
3193 [69538]: https://github.com/rust-lang/rust/pull/69538/
3194 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3195 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3196 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3197 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3198 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3199 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3200 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3201 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3204 Version 1.42.0 (2020-03-12)
3205 ==========================
3209 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3211 fn foo(words: &[&str]) {
3213 ["Hello", "World", "!", ..] => println!("Hello World!"),
3214 ["Foo", "Bar", ..] => println!("Baz"),
3215 rest => println!("{:?}", rest),
3219 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3220 that you can create an enum that has the exact layout and ABI of the type
3222 - [You can now use outer attribute procedural macros on inline modules.][64273]
3223 - [There are some *syntax-only* changes:][67131]
3224 - `default` is syntactically allowed before items in `trait` definitions.
3225 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3226 leave out their bodies in favor of `;`.
3227 - Bounds on associated types in `impl`s are now syntactically allowed
3228 (e.g. `type Foo: Ord;`).
3229 - `...` (the C-variadic type) may occur syntactically directly as the type of
3230 any function parameter.
3232 These are still rejected *semantically*, so you will likely receive an error
3233 but these changes can be seen and parsed by procedural macros and
3234 conditional compilation.
3238 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3239 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3240 - [`Option::{expect,unwrap}` and
3241 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3242 pointing to the location where they were called, rather than
3243 `core`'s internals. ][67887]
3245 \* Refer to Rust's [platform support page][platform-support-doc] for more
3246 information on Rust's tiered platform support.
3250 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3251 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3252 to implement `Sized`.][67935]
3253 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3254 - [`Layout::new` is now `const`.][66254]
3255 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3260 - [`CondVar::wait_while`]
3261 - [`CondVar::wait_timeout_while`]
3263 - [`DebugMap::value`]
3264 - [`ManuallyDrop::take`]
3266 - [`ptr::slice_from_raw_parts_mut`]
3267 - [`ptr::slice_from_raw_parts`]
3271 - [You no longer need to include `extern crate proc_macro;` to be able to
3272 `use proc_macro;` in the `2018` edition.][cargo/7700]
3276 - [`Error::description` has been deprecated, and its use will now produce a
3277 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3279 [68253]: https://github.com/rust-lang/rust/pull/68253/
3280 [68348]: https://github.com/rust-lang/rust/pull/68348/
3281 [67935]: https://github.com/rust-lang/rust/pull/67935/
3282 [68339]: https://github.com/rust-lang/rust/pull/68339/
3283 [68122]: https://github.com/rust-lang/rust/pull/68122/
3284 [64273]: https://github.com/rust-lang/rust/pull/64273/
3285 [67712]: https://github.com/rust-lang/rust/pull/67712/
3286 [67887]: https://github.com/rust-lang/rust/pull/67887/
3287 [67131]: https://github.com/rust-lang/rust/pull/67131/
3288 [67233]: https://github.com/rust-lang/rust/pull/67233/
3289 [66899]: https://github.com/rust-lang/rust/pull/66899/
3290 [66919]: https://github.com/rust-lang/rust/pull/66919/
3291 [66254]: https://github.com/rust-lang/rust/pull/66254/
3292 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3293 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3294 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3295 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3296 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3297 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3298 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3299 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3300 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3303 Version 1.41.1 (2020-02-27)
3304 ===========================
3306 * [Always check types of static items][69145]
3307 * [Always check lifetime bounds of `Copy` impls][69145]
3308 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3310 [69225]: https://github.com/rust-lang/rust/issues/69225
3311 [69145]: https://github.com/rust-lang/rust/pull/69145
3314 Version 1.41.0 (2020-01-30)
3315 ===========================
3320 - [You can now pass type parameters to foreign items when implementing
3321 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3322 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3323 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3324 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3325 - [You can now use any valid identifier in a `format_args` macro.][66847]
3326 Previously identifiers starting with an underscore were not allowed.
3327 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3328 enum variants.][66183] These are still rejected semantically, but
3329 can be seen and parsed by procedural macros and conditional compilation.
3330 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3331 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3332 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3334 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3339 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3340 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3341 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3342 - [You can now pass an arguments file passing the `@path` syntax
3343 to rustc.][66172] Note that the format differs somewhat from what is
3344 found in other tooling; please see [the documentation][argfile-docs] for
3346 - [You can now provide `--extern` flag without a path, indicating that it is
3347 available from the search path or specified with an `-L` flag.][64882]
3349 \* Refer to Rust's [platform support page][platform-support-doc] for more
3350 information on Rust's tiered platform support.
3352 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3357 - [The `core::panic` module is now stable.][66771] It was already stable
3359 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3360 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3361 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3366 - [`Result::map_or`]
3367 - [`Result::map_or_else`]
3368 - [`std::rc::Weak::weak_count`]
3369 - [`std::rc::Weak::strong_count`]
3370 - [`std::sync::Weak::weak_count`]
3371 - [`std::sync::Weak::strong_count`]
3376 - [Cargo will now document all the private items for binary crates
3377 by default.][cargo/7593]
3378 - [`cargo-install` will now reinstall the package if it detects that it is out
3379 of date.][cargo/7560]
3380 - [Cargo.lock now uses a more git friendly format that should help to reduce
3381 merge conflicts.][cargo/7579]
3382 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3383 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3384 optimisation level to `2` for debug builds. You can also use
3385 `[profile.<profile>.build-override]` to override build scripts and
3391 - [You can now specify `edition` in documentation code blocks to compile the block
3392 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3393 should be compiled the 2018 edition of Rust.
3394 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3395 current theme with `--check-theme`.][54733]
3396 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3401 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3402 Apple targets.][apple-32bit-drop] This means that the source code is still
3403 available to build, but the targets are no longer being tested and release
3404 binaries for those platforms will no longer be distributed by the Rust project.
3405 Please refer to the linked blog post for more information.
3407 [54733]: https://github.com/rust-lang/rust/pull/54733/
3408 [61351]: https://github.com/rust-lang/rust/pull/61351/
3409 [62514]: https://github.com/rust-lang/rust/pull/62514/
3410 [67255]: https://github.com/rust-lang/rust/pull/67255/
3411 [66661]: https://github.com/rust-lang/rust/pull/66661/
3412 [66771]: https://github.com/rust-lang/rust/pull/66771/
3413 [66847]: https://github.com/rust-lang/rust/pull/66847/
3414 [66238]: https://github.com/rust-lang/rust/pull/66238/
3415 [66277]: https://github.com/rust-lang/rust/pull/66277/
3416 [66325]: https://github.com/rust-lang/rust/pull/66325/
3417 [66172]: https://github.com/rust-lang/rust/pull/66172/
3418 [66183]: https://github.com/rust-lang/rust/pull/66183/
3419 [65879]: https://github.com/rust-lang/rust/pull/65879/
3420 [65013]: https://github.com/rust-lang/rust/pull/65013/
3421 [64882]: https://github.com/rust-lang/rust/pull/64882/
3422 [64325]: https://github.com/rust-lang/rust/pull/64325/
3423 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3424 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3425 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3426 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3427 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3428 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3429 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3430 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3431 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3432 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3433 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3435 Version 1.40.0 (2019-12-19)
3436 ===========================
3440 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3441 `const` contexts.][65188] e.g.
3444 pub struct Point(i32, i32);
3446 const ORIGIN: Point = {
3447 let constructor = Point;
3453 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3454 indicate that there may be variants or fields added in the future.][64639]
3455 For example this requires adding a wild-card branch (`_ => {}`) to any match
3456 statements on a non-exhaustive `enum`. [(RFC 2008)]
3457 - [You can now use function-like procedural macros in `extern` blocks and in
3458 type positions.][63931] e.g. `type Generated = macro!();`
3459 - [Function-like and attribute procedural macros can now emit
3460 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3461 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3462 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3463 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3467 - [Added tier 3 support\* for the
3468 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3469 - [Added tier 3 support for the
3470 `aarch64-unknown-none-softfloat` target.][64589]
3471 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3472 `mips64el-unknown-linux-muslabi64` targets.][65843]
3474 \* Refer to Rust's [platform support page][platform-support-doc] for more
3475 information on Rust's tiered platform support.
3479 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3483 - [`BTreeMap::get_key_value`]
3484 - [`HashMap::get_key_value`]
3485 - [`Option::as_deref_mut`]
3486 - [`Option::as_deref`]
3487 - [`Option::flatten`]
3488 - [`UdpSocket::peer_addr`]
3489 - [`f32::to_be_bytes`]
3490 - [`f32::to_le_bytes`]
3491 - [`f32::to_ne_bytes`]
3492 - [`f64::to_be_bytes`]
3493 - [`f64::to_le_bytes`]
3494 - [`f64::to_ne_bytes`]
3495 - [`f32::from_be_bytes`]
3496 - [`f32::from_le_bytes`]
3497 - [`f32::from_ne_bytes`]
3498 - [`f64::from_be_bytes`]
3499 - [`f64::from_le_bytes`]
3500 - [`f64::from_ne_bytes`]
3507 - [Cargo will now always display warnings, rather than only on
3508 fresh builds.][cargo/7450]
3509 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3510 now produce an error.][cargo/7507] Previously these flags were ignored.
3511 - [You can now publish `dev-dependencies` without including
3512 a `version`.][cargo/7333]
3516 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3517 when running documentation tests with `rustdoc`.][63803]
3521 - [As previously announced, any previous NLL warnings in the 2015 edition are
3522 now hard errors.][64221]
3523 - [The `include!` macro will now warn if it failed to include the
3524 entire file.][64284] The `include!` macro unintentionally only includes the
3525 first _expression_ in a file, and this can be unintuitive. This will become
3526 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3527 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3528 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3529 or `extern` blocks now correctly emits a hard error.
3531 [65294]: https://github.com/rust-lang/rust/pull/65294/
3532 [66103]: https://github.com/rust-lang/rust/pull/66103/
3533 [65843]: https://github.com/rust-lang/rust/pull/65843/
3534 [65188]: https://github.com/rust-lang/rust/pull/65188/
3535 [65092]: https://github.com/rust-lang/rust/pull/65092/
3536 [64589]: https://github.com/rust-lang/rust/pull/64589/
3537 [64639]: https://github.com/rust-lang/rust/pull/64639/
3538 [64221]: https://github.com/rust-lang/rust/pull/64221/
3539 [64284]: https://github.com/rust-lang/rust/pull/64284/
3540 [63931]: https://github.com/rust-lang/rust/pull/63931/
3541 [64035]: https://github.com/rust-lang/rust/pull/64035/
3542 [63674]: https://github.com/rust-lang/rust/pull/63674/
3543 [63803]: https://github.com/rust-lang/rust/pull/63803/
3544 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3545 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3546 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3547 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3548 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3549 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3550 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3551 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3552 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3553 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3554 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3555 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3556 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3557 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3558 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3559 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3560 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3561 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3562 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3563 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3564 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3565 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3566 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3567 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3568 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3571 Version 1.39.0 (2019-11-07)
3572 ===========================
3576 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3577 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3578 - [You can now use certain attributes on function, closure, and function pointer
3579 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3580 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3581 attributes applied to items. e.g.
3584 #[cfg(windows)] slice: &[u16],
3585 #[cfg(not(windows))] slice: &[u8],
3590 - [You can now take shared references to bind-by-move patterns in the `if` guards
3591 of `match` arms.][63118] e.g.
3594 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3598 // ---- `nums` is bound by move.
3599 if nums.iter().sum::<u8>() == 10
3600 // ^------ `.iter()` implicitly takes a reference to `nums`.
3603 // ----------- Legal as `nums` was bound by move and so we have ownership.
3605 _ => unreachable!(),
3614 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3615 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3616 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3617 **Note** Cargo currently doesn't use this feature. Refer to
3618 [cargo#7315][cargo/7315] to track this feature's progress.
3619 - [You can now pass `--show-output` argument to test binaries to print the
3620 output of successful tests.][62600]
3623 \* Refer to Rust's [platform support page][platform-support-doc] for more
3624 information on Rust's tiered platform support.
3628 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3629 - [`LinkedList::new` is now a `const` function.][63684]
3630 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3631 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3632 now `const`.][63786]
3636 - [`Pin::into_inner`]
3637 - [`Instant::checked_duration_since`]
3638 - [`Instant::saturating_duration_since`]
3642 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3643 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3644 `--all` is now deprecated.
3648 - [You can now pass `-Clinker` to rustdoc to control the linker used
3649 for compiling doctests.][63834]
3653 - [Code that was previously accepted by the old borrow checker, but rejected by
3654 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3655 previously a warning, and will also become a hard error in the Rust 2015
3656 edition in the 1.40.0 release.
3657 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3658 run tests.][63827] This should improve performance when running a large
3660 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3661 recommended to use the `?` operator instead.
3662 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3665 [62600]: https://github.com/rust-lang/rust/pull/62600/
3666 [62672]: https://github.com/rust-lang/rust/pull/62672/
3667 [63118]: https://github.com/rust-lang/rust/pull/63118/
3668 [63209]: https://github.com/rust-lang/rust/pull/63209/
3669 [63402]: https://github.com/rust-lang/rust/pull/63402/
3670 [63565]: https://github.com/rust-lang/rust/pull/63565/
3671 [63595]: https://github.com/rust-lang/rust/pull/63595/
3672 [63684]: https://github.com/rust-lang/rust/pull/63684/
3673 [63698]: https://github.com/rust-lang/rust/pull/63698/
3674 [63770]: https://github.com/rust-lang/rust/pull/63770/
3675 [63786]: https://github.com/rust-lang/rust/pull/63786/
3676 [63827]: https://github.com/rust-lang/rust/pull/63827/
3677 [63834]: https://github.com/rust-lang/rust/pull/63834/
3678 [64010]: https://github.com/rust-lang/rust/pull/64010/
3679 [64028]: https://github.com/rust-lang/rust/pull/64028/
3680 [64334]: https://github.com/rust-lang/rust/pull/64334/
3681 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3682 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3683 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3684 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3685 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3686 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3688 Version 1.38.0 (2019-09-26)
3689 ==========================
3693 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3694 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3698 - [Added pipelined compilation support to `rustc`.][62766] This will
3699 improve compilation times in some cases. For further information please refer
3700 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3701 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3702 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3703 `x86_64-uwp-windows-msvc` targets.][60260]
3704 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3705 `armv7-unknown-linux-musleabi` targets.][63107]
3706 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3707 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3708 - [Upgraded to LLVM 9.][62592]
3710 \* Refer to Rust's [platform support page][platform-support-doc] for more
3711 information on Rust's tiered platform support.
3715 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3716 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3717 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3718 is available at `std::clone::Clone`). This also makes all built-in macros
3719 available in `std`/`core` root. e.g. `std::include_bytes!`.
3720 - [`str::Chars` now implements `Debug`.][63000]
3721 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3722 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3723 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3724 - [Added euclidean remainder and division operations (`div_euclid`,
3725 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3726 `overflowing`, and `wrapping` versions are available for all
3728 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3729 `PartialEq`.][61491]
3730 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3734 - [`<*const T>::cast`]
3735 - [`<*mut T>::cast`]
3736 - [`Duration::as_secs_f32`]
3737 - [`Duration::as_secs_f64`]
3738 - [`Duration::div_f32`]
3739 - [`Duration::div_f64`]
3740 - [`Duration::from_secs_f32`]
3741 - [`Duration::from_secs_f64`]
3742 - [`Duration::mul_f32`]
3743 - [`Duration::mul_f64`]
3744 - [`any::type_name`]
3748 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3749 - [You can now pass the `--features` option multiple times to enable
3750 multiple features.][cargo/7084]
3755 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3759 - [`rustc` will now warn about some incorrect uses of
3760 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3764 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3766 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3767 issues][62896] with certain crates such as libc.
3769 [60260]: https://github.com/rust-lang/rust/pull/60260/
3770 [61457]: https://github.com/rust-lang/rust/pull/61457/
3771 [61491]: https://github.com/rust-lang/rust/pull/61491/
3772 [61884]: https://github.com/rust-lang/rust/pull/61884/
3773 [61953]: https://github.com/rust-lang/rust/pull/61953/
3774 [62042]: https://github.com/rust-lang/rust/pull/62042/
3775 [62528]: https://github.com/rust-lang/rust/pull/62528/
3776 [62583]: https://github.com/rust-lang/rust/pull/62583/
3777 [62735]: https://github.com/rust-lang/rust/pull/62735/
3778 [62766]: https://github.com/rust-lang/rust/pull/62766/
3779 [62784]: https://github.com/rust-lang/rust/pull/62784/
3780 [62592]: https://github.com/rust-lang/rust/pull/62592/
3781 [62785]: https://github.com/rust-lang/rust/issues/62785/
3782 [62814]: https://github.com/rust-lang/rust/pull/62814/
3783 [62896]: https://github.com/rust-lang/rust/issues/62896/
3784 [63000]: https://github.com/rust-lang/rust/pull/63000/
3785 [63056]: https://github.com/rust-lang/rust/pull/63056/
3786 [63107]: https://github.com/rust-lang/rust/pull/63107/
3787 [63346]: https://github.com/rust-lang/rust/pull/63346/
3788 [63421]: https://github.com/rust-lang/rust/pull/63421/
3789 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3790 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3791 [63048]: https://github.com/rust-lang/rust/pull/63048
3792 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3793 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3794 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3795 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3796 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3797 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3798 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3799 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3800 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3801 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3802 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3803 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3804 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3806 Version 1.37.0 (2019-08-15)
3807 ==========================
3811 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3812 [`Box`][62228], or an [array][62235] and unused.
3813 - [You can now use the `cfg` and `cfg_attr` attributes on
3814 generic parameters.][61547]
3815 - [You can now use enum variants through type alias.][61682] e.g. You can
3816 write the following:
3818 type MyOption = Option<u8>;
3820 fn increment_or_zero(x: MyOption) -> u8 {
3822 MyOption::Some(y) => y + 1,
3823 MyOption::None => 0,
3827 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3828 `const _: u32 = 5;`.
3829 - [You can now use `#[repr(align(X)]` on enums.][61229]
3830 - [The `?` Kleene macro operator is now available in the
3831 2015 edition.][60932]
3835 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3836 and `-C profile-use` flags.][61268] For more information on how to use profile
3837 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3838 - [The `rust-lldb` wrapper script should now work again.][61827]
3842 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3846 - [`BufReader::buffer`]
3847 - [`BufWriter::buffer`]
3848 - [`Cell::from_mut`]
3849 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3850 - [`DoubleEndedIterator::nth_back`]
3852 - [`Wrapping::reverse_bits`]
3853 - [`i128::reverse_bits`]
3854 - [`i16::reverse_bits`]
3855 - [`i32::reverse_bits`]
3856 - [`i64::reverse_bits`]
3857 - [`i8::reverse_bits`]
3858 - [`isize::reverse_bits`]
3859 - [`slice::copy_within`]
3860 - [`u128::reverse_bits`]
3861 - [`u16::reverse_bits`]
3862 - [`u32::reverse_bits`]
3863 - [`u64::reverse_bits`]
3864 - [`u8::reverse_bits`]
3865 - [`usize::reverse_bits`]
3869 - [`Cargo.lock` files are now included by default when publishing executable crates
3870 with executables.][cargo/7026]
3871 - [You can now specify `default-run="foo"` in `[package]` to specify the
3872 default executable to use for `cargo run`.][cargo/7056]
3879 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3880 Please transition your code to using the `..=` syntax for inclusive
3882 - [Using a trait object without the `dyn` will now warn by default.][61203]
3883 Please transition your code to use `dyn Trait` for trait objects instead.
3885 [62228]: https://github.com/rust-lang/rust/pull/62228/
3886 [62235]: https://github.com/rust-lang/rust/pull/62235/
3887 [61802]: https://github.com/rust-lang/rust/pull/61802/
3888 [61827]: https://github.com/rust-lang/rust/pull/61827/
3889 [61547]: https://github.com/rust-lang/rust/pull/61547/
3890 [61682]: https://github.com/rust-lang/rust/pull/61682/
3891 [61268]: https://github.com/rust-lang/rust/pull/61268/
3892 [61342]: https://github.com/rust-lang/rust/pull/61342/
3893 [61347]: https://github.com/rust-lang/rust/pull/61347/
3894 [61100]: https://github.com/rust-lang/rust/pull/61100/
3895 [61203]: https://github.com/rust-lang/rust/pull/61203/
3896 [61229]: https://github.com/rust-lang/rust/pull/61229/
3897 [60932]: https://github.com/rust-lang/rust/pull/60932/
3898 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3899 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3900 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3901 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3902 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3903 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3904 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3905 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3906 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3907 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3908 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3909 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3910 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3911 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3912 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3913 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3914 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3915 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3916 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3917 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3918 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3919 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3920 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3923 Version 1.36.0 (2019-07-04)
3924 ==========================
3928 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3929 - [The order of traits in trait objects no longer affects the semantics of that
3930 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3931 `dyn fmt::Debug + Send`, where this was previously not the case.
3935 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3936 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3937 - [`mem::needs_drop` is now available as a const fn.][60364]
3938 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3939 - [`String` now implements `BorrowMut<str>`.][60404]
3940 - [`io::Cursor` now implements `Default`.][60234]
3941 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3942 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3943 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3944 environment has access to heap memory allocation.
3945 - [`String` now implements `From<&String>`.][59825]
3946 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3947 return a tuple of each argument when there is multiple arguments.
3948 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3953 - [`VecDeque::rotate_left`]
3954 - [`VecDeque::rotate_right`]
3955 - [`Iterator::copied`]
3957 - [`io::IoSliceMut`]
3958 - [`Read::read_vectored`]
3959 - [`Write::write_vectored`]
3960 - [`str::as_mut_ptr`]
3961 - [`mem::MaybeUninit`]
3962 - [`pointer::align_offset`]
3963 - [`future::Future`]
3965 - [`task::RawWaker`]
3966 - [`task::RawWakerVTable`]
3972 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3973 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3975 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3979 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3986 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3987 longer recommended, and will be deprecated in 1.39.0.
3989 [60318]: https://github.com/rust-lang/rust/pull/60318/
3990 [60364]: https://github.com/rust-lang/rust/pull/60364/
3991 [60370]: https://github.com/rust-lang/rust/pull/60370/
3992 [60404]: https://github.com/rust-lang/rust/pull/60404/
3993 [60234]: https://github.com/rust-lang/rust/pull/60234/
3994 [60244]: https://github.com/rust-lang/rust/pull/60244/
3995 [58623]: https://github.com/rust-lang/rust/pull/58623/
3996 [59648]: https://github.com/rust-lang/rust/pull/59648/
3997 [59675]: https://github.com/rust-lang/rust/pull/59675/
3998 [59825]: https://github.com/rust-lang/rust/pull/59825/
3999 [59826]: https://github.com/rust-lang/rust/pull/59826/
4000 [59445]: https://github.com/rust-lang/rust/pull/59445/
4001 [59114]: https://github.com/rust-lang/rust/pull/59114/
4002 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
4003 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
4004 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
4005 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
4006 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
4007 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
4008 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
4009 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
4010 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
4011 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
4012 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
4013 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
4014 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
4015 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
4016 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
4017 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
4018 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
4019 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
4020 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
4021 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
4024 Version 1.35.0 (2019-05-23)
4025 ==========================
4029 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
4030 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
4031 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
4033 unsafe fn call_unsafe(func: unsafe fn()) {
4038 unsafe { call_unsafe(|| {}); }
4045 - [Added the `armv6-unknown-freebsd-gnueabihf` and
4046 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
4047 - [Added the `wasm32-unknown-wasi` target.][59464]
4052 - [`Thread` will now show its ID in `Debug` output.][59460]
4053 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
4054 - [`alloc::System` now implements `Default`.][59451]
4055 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
4057 - [`char::{ToLowercase, ToUppercase}` now
4058 implement `ExactSizeIterator`.][58778]
4059 - [All `NonZero` numeric types now implement `FromStr`.][58717]
4060 - [Removed the `Read` trait bounds
4061 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
4062 - [You can now call the `dbg!` macro without any parameters to print the file
4063 and line where it is called.][57847]
4064 - [In place ASCII case conversions are now up to 4× faster.][59283]
4065 e.g. `str::make_ascii_lowercase`
4066 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
4073 - [`RefCell::replace_with`]
4074 - [`RefCell::map_split`]
4076 - [`Range::contains`]
4077 - [`RangeFrom::contains`]
4078 - [`RangeTo::contains`]
4079 - [`RangeInclusive::contains`]
4080 - [`RangeToInclusive::contains`]
4081 - [`Option::copied`]
4085 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
4086 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
4091 - [The Rust toolchain is now available natively for musl based distros.][58575]
4093 [59460]: https://github.com/rust-lang/rust/pull/59460/
4094 [59464]: https://github.com/rust-lang/rust/pull/59464/
4095 [59500]: https://github.com/rust-lang/rust/pull/59500/
4096 [59512]: https://github.com/rust-lang/rust/pull/59512/
4097 [59580]: https://github.com/rust-lang/rust/pull/59580/
4098 [59283]: https://github.com/rust-lang/rust/pull/59283/
4099 [59451]: https://github.com/rust-lang/rust/pull/59451/
4100 [59076]: https://github.com/rust-lang/rust/pull/59076/
4101 [58778]: https://github.com/rust-lang/rust/pull/58778/
4102 [58717]: https://github.com/rust-lang/rust/pull/58717/
4103 [58369]: https://github.com/rust-lang/rust/pull/58369/
4104 [58423]: https://github.com/rust-lang/rust/pull/58423/
4105 [58080]: https://github.com/rust-lang/rust/pull/58080/
4106 [57847]: https://github.com/rust-lang/rust/pull/57847/
4107 [58575]: https://github.com/rust-lang/rust/pull/58575
4108 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
4109 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
4110 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
4111 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
4112 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
4113 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
4114 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
4115 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
4116 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
4117 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
4118 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
4119 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
4121 Version 1.34.2 (2019-05-14)
4122 ===========================
4124 * [Destabilize the `Error::type_id` function due to a security
4125 vulnerability][60785] ([CVE-2019-12083])
4127 [60785]: https://github.com/rust-lang/rust/pull/60785
4128 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
4130 Version 1.34.1 (2019-04-25)
4131 ===========================
4133 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
4134 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
4135 * [Fix Clippy panic when checking some macros][clippy/3805]
4137 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
4138 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
4139 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
4141 Version 1.34.0 (2019-04-11)
4142 ==========================
4146 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
4147 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
4149 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
4150 `#[attr{}]` procedural macros.][57367]
4151 - [You can now write `extern crate self as foo;`][57407] to import your
4152 crate's root into the extern prelude.
4157 - [You can now target `riscv64imac-unknown-none-elf` and
4158 `riscv64gc-unknown-none-elf`.][58406]
4159 - [You can now enable linker plugin LTO optimisations with
4160 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
4161 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
4163 - [You can now target `powerpc64-unknown-freebsd`.][57809]
4168 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
4169 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
4170 the `Hash` trait to create an iterator.
4171 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
4172 methods.][58421] Most notably you no longer require the `Ord` trait to create
4174 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
4175 for all numeric types.][58044]
4176 - [Indexing a `str` is now generic over all types that
4177 implement `SliceIndex<str>`.][57604]
4178 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
4179 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
4180 produce a warning if their returning type is unused.
4181 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
4182 `overflowing_pow` are now available for all numeric types.][57873] These are
4183 equivalent to methods such as `wrapping_add` for the `pow` operation.
4191 * [`Error::type_id`]
4192 * [`atomic::AtomicI16`]
4193 * [`atomic::AtomicI32`]
4194 * [`atomic::AtomicI64`]
4195 * [`atomic::AtomicI8`]
4196 * [`atomic::AtomicU16`]
4197 * [`atomic::AtomicU32`]
4198 * [`atomic::AtomicU64`]
4199 * [`atomic::AtomicU8`]
4200 * [`convert::Infallible`]
4201 * [`convert::TryFrom`]
4202 * [`convert::TryInto`]
4204 * [`iter::successors`]
4205 * [`num::NonZeroI128`]
4206 * [`num::NonZeroI16`]
4207 * [`num::NonZeroI32`]
4208 * [`num::NonZeroI64`]
4209 * [`num::NonZeroI8`]
4210 * [`num::NonZeroIsize`]
4211 * [`slice::sort_by_cached_key`]
4212 * [`str::escape_debug`]
4213 * [`str::escape_default`]
4214 * [`str::escape_unicode`]
4215 * [`str::split_ascii_whitespace`]
4218 * [`Instant::checked_add`]
4219 * [`Instant::checked_sub`]
4220 * [`SystemTime::checked_add`]
4221 * [`SystemTime::checked_sub`]
4225 - [You can now use alternative registries to crates.io.][cargo/6654]
4229 - [You can now use the `?` operator in your documentation tests without manually
4230 adding `fn main() -> Result<(), _> {}`.][56470]
4234 - [`Command::before_exec` is being replaced by the unsafe method
4235 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4236 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4237 can now use `const` functions in `static` variables.
4239 [58370]: https://github.com/rust-lang/rust/pull/58370/
4240 [58406]: https://github.com/rust-lang/rust/pull/58406/
4241 [58421]: https://github.com/rust-lang/rust/pull/58421/
4242 [58166]: https://github.com/rust-lang/rust/pull/58166/
4243 [58044]: https://github.com/rust-lang/rust/pull/58044/
4244 [58057]: https://github.com/rust-lang/rust/pull/58057/
4245 [58059]: https://github.com/rust-lang/rust/pull/58059/
4246 [57809]: https://github.com/rust-lang/rust/pull/57809/
4247 [57873]: https://github.com/rust-lang/rust/pull/57873/
4248 [57604]: https://github.com/rust-lang/rust/pull/57604/
4249 [57367]: https://github.com/rust-lang/rust/pull/57367/
4250 [57407]: https://github.com/rust-lang/rust/pull/57407/
4251 [57425]: https://github.com/rust-lang/rust/pull/57425/
4252 [57106]: https://github.com/rust-lang/rust/pull/57106/
4253 [56470]: https://github.com/rust-lang/rust/pull/56470/
4254 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4255 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4256 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4257 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4258 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4259 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4260 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4261 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4262 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4263 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4264 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4265 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4266 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4267 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4268 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4269 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4270 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4271 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4272 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4273 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4274 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4275 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4276 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4277 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4278 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4279 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4280 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4281 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4282 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4283 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4284 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4287 Version 1.33.0 (2019-02-28)
4288 ==========================
4292 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4293 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4294 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4295 E.g. You can have match statement on a `u8` that covers `0..=255` and
4296 you would no longer be required to have a `_ => unreachable!()` case.
4297 - [You can now have multiple patterns in `if let` and `while let`
4298 expressions.][57532] You can do this with the same syntax as a `match`
4308 let state = Creature::Crab("Ferris");
4310 if let Creature::Crab(name) | Creature::Person(name) = state {
4311 println!("This creature's name is: {}", name);
4315 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4316 this feature will by default produce a warning as this behaviour can be
4317 unintuitive. E.g. `if let _ = 5 {}`
4318 - [You can now use `let` bindings, assignments, expression statements,
4319 and irrefutable pattern destructuring in const functions.][57175]
4320 - [You can now call unsafe const functions.][57067] E.g.
4322 const unsafe fn foo() -> i32 { 5 }
4323 const fn bar() -> i32 {
4327 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4328 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4329 - [You can now specify a specific alignment with the `#[repr(packed)]`
4330 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4331 with an alignment of 2 bytes and a size of 6 bytes.
4332 - [You can now import an item from a module as an `_`.][56303] This allows you to
4333 import a trait's impls, and not have the name in the namespace. E.g.
4335 use std::io::Read as _;
4337 // Allowed as there is only one `Read` in the module.
4340 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4344 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4345 command line argument.][56351]
4346 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4347 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4348 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4349 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4350 information on Rust's platform support.
4351 - [Added support for the `thumbv7neon-linux-androideabi` and
4352 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4353 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4357 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4358 functions for all numeric types.][57566]
4359 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4360 are now `const` functions for all numeric types.][57105]
4361 - [The methods `is_positive` and `is_negative` are now `const` functions for
4362 all signed numeric types.][57105]
4363 - [The `get` method for all `NonZero` types is now `const`.][57167]
4364 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4365 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4366 numeric types.][57234]
4367 - [`Ipv4Addr::new` is now a `const` function][57234]
4371 - [`unix::FileExt::read_exact_at`]
4372 - [`unix::FileExt::write_all_at`]
4373 - [`Option::transpose`]
4374 - [`Result::transpose`]
4375 - [`convert::identity`]
4378 - [`marker::PhantomPinned`]
4379 - [`Vec::resize_with`]
4380 - [`VecDeque::resize_with`]
4381 - [`Duration::as_millis`]
4382 - [`Duration::as_micros`]
4383 - [`Duration::as_nanos`]
4388 - [You can now publish crates that require a feature flag to compile with
4389 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4390 - [Cargo should now rebuild a crate if a file was modified during the initial
4395 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4396 are now deprecated in the standard library, and their usage will now produce a warning.
4397 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4399 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4401 - [Libtest no longer creates a new thread for each test when
4402 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4404 [56243]: https://github.com/rust-lang/rust/pull/56243
4405 [56303]: https://github.com/rust-lang/rust/pull/56303/
4406 [56351]: https://github.com/rust-lang/rust/pull/56351/
4407 [56362]: https://github.com/rust-lang/rust/pull/56362
4408 [56642]: https://github.com/rust-lang/rust/pull/56642/
4409 [56769]: https://github.com/rust-lang/rust/pull/56769/
4410 [56805]: https://github.com/rust-lang/rust/pull/56805
4411 [56947]: https://github.com/rust-lang/rust/pull/56947/
4412 [57049]: https://github.com/rust-lang/rust/pull/57049/
4413 [57067]: https://github.com/rust-lang/rust/pull/57067/
4414 [57105]: https://github.com/rust-lang/rust/pull/57105
4415 [57130]: https://github.com/rust-lang/rust/pull/57130/
4416 [57167]: https://github.com/rust-lang/rust/pull/57167/
4417 [57175]: https://github.com/rust-lang/rust/pull/57175/
4418 [57234]: https://github.com/rust-lang/rust/pull/57234/
4419 [57332]: https://github.com/rust-lang/rust/pull/57332/
4420 [57465]: https://github.com/rust-lang/rust/pull/57465/
4421 [57532]: https://github.com/rust-lang/rust/pull/57532/
4422 [57535]: https://github.com/rust-lang/rust/pull/57535/
4423 [57566]: https://github.com/rust-lang/rust/pull/57566/
4424 [57615]: https://github.com/rust-lang/rust/pull/57615/
4425 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4426 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4427 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4428 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4429 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4430 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4431 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4432 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4433 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4434 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4435 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4436 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4437 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4438 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4439 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4440 [platform-support]: https://forge.rust-lang.org/platform-support.html
4442 Version 1.32.0 (2019-01-17)
4443 ==========================
4448 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4449 operator allows you to specify zero or one repetitions similar to the `*` and
4451 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4452 now always resolve to the item (`enum`, `struct`, etc.) available in the
4453 module if present, before resolving to a external crate or an item the prelude.][56759]
4456 enum Color { Red, Green, Blue }
4462 - [You can now match against `PhantomData<T>` types.][55837]
4463 - [You can now match against literals in macros with the `literal`
4464 specifier.][56072] This will match against a literal of any type.
4465 E.g. `1`, `'A'`, `"Hello World"`
4466 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4468 struct Point(i32, i32);
4471 pub fn new(x: i32, y: i32) -> Self {
4475 pub fn is_origin(&self) -> bool {
4483 - [Self can also now be used in type definitions.][56366] E.g.
4487 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4490 Cons(T, Box<Self>) // likewise here
4493 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4494 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4498 - [The default allocator has changed from jemalloc to the default allocator on
4499 your system.][55238] The compiler itself on Linux & macOS will still use
4500 jemalloc, but programs compiled with it will use the system allocator.
4501 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4505 - [`PathBuf` now implements `FromStr`.][55148]
4506 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4507 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4508 easily debug expressions in your rust program. E.g.
4511 let b = dbg!(a * 2) + 1;
4512 // ^-- prints: [src/main.rs:4] a * 2 = 4
4516 The following APIs are now `const` functions and can be used in a
4520 - [`UnsafeCell::get`]
4521 - [`char::is_ascii`]
4523 - [`ManuallyDrop::new`]
4524 - [`ManuallyDrop::into_inner`]
4525 - [`RangeInclusive::start`]
4526 - [`RangeInclusive::end`]
4527 - [`NonNull::as_ptr`]
4530 - [`Duration::as_secs`]
4531 - [`Duration::subsec_millis`]
4532 - [`Duration::subsec_micros`]
4533 - [`Duration::subsec_nanos`]
4535 - [`Ipv4Addr::is_unspecified`]
4537 - [`Ipv6Addr::octets`]
4541 - [`i8::to_be_bytes`]
4542 - [`i8::to_le_bytes`]
4543 - [`i8::to_ne_bytes`]
4544 - [`i8::from_be_bytes`]
4545 - [`i8::from_le_bytes`]
4546 - [`i8::from_ne_bytes`]
4547 - [`i16::to_be_bytes`]
4548 - [`i16::to_le_bytes`]
4549 - [`i16::to_ne_bytes`]
4550 - [`i16::from_be_bytes`]
4551 - [`i16::from_le_bytes`]
4552 - [`i16::from_ne_bytes`]
4553 - [`i32::to_be_bytes`]
4554 - [`i32::to_le_bytes`]
4555 - [`i32::to_ne_bytes`]
4556 - [`i32::from_be_bytes`]
4557 - [`i32::from_le_bytes`]
4558 - [`i32::from_ne_bytes`]
4559 - [`i64::to_be_bytes`]
4560 - [`i64::to_le_bytes`]
4561 - [`i64::to_ne_bytes`]
4562 - [`i64::from_be_bytes`]
4563 - [`i64::from_le_bytes`]
4564 - [`i64::from_ne_bytes`]
4565 - [`i128::to_be_bytes`]
4566 - [`i128::to_le_bytes`]
4567 - [`i128::to_ne_bytes`]
4568 - [`i128::from_be_bytes`]
4569 - [`i128::from_le_bytes`]
4570 - [`i128::from_ne_bytes`]
4571 - [`isize::to_be_bytes`]
4572 - [`isize::to_le_bytes`]
4573 - [`isize::to_ne_bytes`]
4574 - [`isize::from_be_bytes`]
4575 - [`isize::from_le_bytes`]
4576 - [`isize::from_ne_bytes`]
4577 - [`u8::to_be_bytes`]
4578 - [`u8::to_le_bytes`]
4579 - [`u8::to_ne_bytes`]
4580 - [`u8::from_be_bytes`]
4581 - [`u8::from_le_bytes`]
4582 - [`u8::from_ne_bytes`]
4583 - [`u16::to_be_bytes`]
4584 - [`u16::to_le_bytes`]
4585 - [`u16::to_ne_bytes`]
4586 - [`u16::from_be_bytes`]
4587 - [`u16::from_le_bytes`]
4588 - [`u16::from_ne_bytes`]
4589 - [`u32::to_be_bytes`]
4590 - [`u32::to_le_bytes`]
4591 - [`u32::to_ne_bytes`]
4592 - [`u32::from_be_bytes`]
4593 - [`u32::from_le_bytes`]
4594 - [`u32::from_ne_bytes`]
4595 - [`u64::to_be_bytes`]
4596 - [`u64::to_le_bytes`]
4597 - [`u64::to_ne_bytes`]
4598 - [`u64::from_be_bytes`]
4599 - [`u64::from_le_bytes`]
4600 - [`u64::from_ne_bytes`]
4601 - [`u128::to_be_bytes`]
4602 - [`u128::to_le_bytes`]
4603 - [`u128::to_ne_bytes`]
4604 - [`u128::from_be_bytes`]
4605 - [`u128::from_le_bytes`]
4606 - [`u128::from_ne_bytes`]
4607 - [`usize::to_be_bytes`]
4608 - [`usize::to_le_bytes`]
4609 - [`usize::to_ne_bytes`]
4610 - [`usize::from_be_bytes`]
4611 - [`usize::from_le_bytes`]
4612 - [`usize::from_ne_bytes`]
4616 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4617 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4621 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4625 - [The argument types for AVX's
4626 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4627 been changed from `*const` to `*mut` as the previous implementation
4631 [55148]: https://github.com/rust-lang/rust/pull/55148/
4632 [55238]: https://github.com/rust-lang/rust/pull/55238/
4633 [55280]: https://github.com/rust-lang/rust/pull/55280/
4634 [55610]: https://github.com/rust-lang/rust/pull/55610/
4635 [55663]: https://github.com/rust-lang/rust/pull/55663/
4636 [55702]: https://github.com/rust-lang/rust/pull/55702/
4637 [55837]: https://github.com/rust-lang/rust/pull/55837/
4638 [55843]: https://github.com/rust-lang/rust/pull/55843/
4639 [56072]: https://github.com/rust-lang/rust/pull/56072/
4640 [56245]: https://github.com/rust-lang/rust/pull/56245/
4641 [56365]: https://github.com/rust-lang/rust/pull/56365/
4642 [56366]: https://github.com/rust-lang/rust/pull/56366/
4643 [56395]: https://github.com/rust-lang/rust/pull/56395/
4644 [56759]: https://github.com/rust-lang/rust/pull/56759/
4645 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4646 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4647 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4648 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4649 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4650 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4651 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4652 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4653 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4654 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4655 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4656 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4657 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4658 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4659 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4660 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4661 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4662 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4663 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4664 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4665 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4666 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4667 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4668 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4669 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4670 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4671 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4672 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4673 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4674 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4675 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4676 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4677 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4678 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4679 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4680 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4681 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4682 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4683 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4684 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4685 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4686 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4687 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4688 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4689 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4690 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4691 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4692 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4693 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4694 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4695 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4696 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4697 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4698 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4699 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4700 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4701 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4702 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4703 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4704 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4705 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4706 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4707 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4708 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4709 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4710 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4711 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4712 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4713 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4714 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4715 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4716 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4717 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4718 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4719 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4720 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4721 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4722 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4723 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4724 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4725 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4726 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4727 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4728 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4729 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4730 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4731 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4732 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4733 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4734 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4735 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4736 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4737 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4740 Version 1.31.1 (2018-12-20)
4741 ===========================
4743 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4744 - [Fix broken go-to-definition in RLS][rls/1171]
4745 - [Fix infinite loop on hover in RLS][rls/1170]
4747 [56562]: https://github.com/rust-lang/rust/pull/56562
4748 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4749 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4751 Version 1.31.0 (2018-12-06)
4752 ==========================
4756 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4757 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4758 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4759 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4761 - [You can now define and use `const` functions.][54835] These are currently
4762 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4763 [language reference][const-reference] for what exactly is available.
4764 - [You can now use tool lints, which allow you to scope lints from external
4765 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4766 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4767 a crate, not just in exported functions.][54451]
4768 - [You can now use parentheses in pattern matches.][54497]
4772 - [Updated musl to 1.1.20][54430]
4776 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4777 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4778 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4779 into `Option<&mut T>` using the `From` trait.][53218]
4780 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4785 - [`slice::align_to`]
4786 - [`slice::align_to_mut`]
4787 - [`slice::chunks_exact`]
4788 - [`slice::chunks_exact_mut`]
4789 - [`slice::rchunks`]
4790 - [`slice::rchunks_mut`]
4791 - [`slice::rchunks_exact`]
4792 - [`slice::rchunks_exact_mut`]
4793 - [`Option::replace`]
4797 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4798 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4799 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4801 [52813]: https://github.com/rust-lang/rust/pull/52813/
4802 [53218]: https://github.com/rust-lang/rust/pull/53218/
4803 [54057]: https://github.com/rust-lang/rust/pull/54057/
4804 [54240]: https://github.com/rust-lang/rust/pull/54240/
4805 [54430]: https://github.com/rust-lang/rust/pull/54430/
4806 [54451]: https://github.com/rust-lang/rust/pull/54451/
4807 [54497]: https://github.com/rust-lang/rust/pull/54497/
4808 [54778]: https://github.com/rust-lang/rust/pull/54778/
4809 [54835]: https://github.com/rust-lang/rust/pull/54835/
4810 [54870]: https://github.com/rust-lang/rust/pull/54870/
4811 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4812 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4813 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4814 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4815 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4816 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4817 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4818 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4819 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4820 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4821 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4822 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4823 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4824 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4826 Version 1.30.1 (2018-11-08)
4827 ===========================
4829 - [Fixed overflow ICE in rustdoc][54199]
4830 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4832 [54199]: https://github.com/rust-lang/rust/pull/54199
4833 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4835 Version 1.30.0 (2018-10-25)
4836 ==========================
4840 - [Procedural macros are now available.][52081] These kinds of macros allow for
4841 more powerful code generation. There is a [new chapter available][proc-macros]
4842 in the Rust Programming Language book that goes further in depth.
4843 - [You can now use keywords as identifiers using the raw identifiers
4844 syntax (`r#`),][53236] e.g. `let r#for = true;`
4845 - [Using anonymous parameters in traits is now deprecated with a warning and
4846 will be a hard error in the 2018 edition.][53272]
4847 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4848 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4849 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4850 Previously, using a external crate in a module without a use statement
4851 required `let json = ::serde_json::from_str(foo);` but can now be written
4852 as `let json = serde_json::from_str(foo);`.
4853 - [You can now apply the `#[used]` attribute to static items to prevent the
4854 compiler from optimising them away, even if they appear to be unused,][51363]
4855 e.g. `#[used] static FOO: u32 = 1;`
4856 - [You can now import and reexport macros from other crates with the `use`
4857 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4858 the root module of the crate. If your macro relies on calling other local
4859 macros, it is recommended to export with the
4860 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4862 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4863 using the `vis` specifier.][53370]
4864 - [Non-macro attributes now allow all forms of literals, not just
4865 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4866 write `#[attr(true)]`.
4867 - [You can now specify a function to handle a panic in the Rust runtime with the
4868 `#[panic_handler]` attribute.][51366]
4872 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4873 - [Added the `aarch64-unknown-netbsd` target][53165]
4874 - [Upgraded to LLVM 8.][53611]
4878 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4882 - [`Ipv4Addr::BROADCAST`]
4883 - [`Ipv4Addr::LOCALHOST`]
4884 - [`Ipv4Addr::UNSPECIFIED`]
4885 - [`Ipv6Addr::LOCALHOST`]
4886 - [`Ipv6Addr::UNSPECIFIED`]
4887 - [`Iterator::find_map`]
4889 The following methods are replacement methods for `trim_left`, `trim_right`,
4890 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4892 - [`str::trim_end_matches`]
4894 - [`str::trim_start_matches`]
4895 - [`str::trim_start`]
4899 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4900 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4901 equivalent to calling `rustdoc --error-format=json`.
4902 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4906 - [`rustdoc` allows you to specify what edition to treat your code as with the
4907 `--edition` option.][54057]
4908 - [`rustdoc` now has the `--color` (specify whether to output color) and
4909 `--error-format` (specify error format, e.g. `json`) options.][53003]
4910 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4911 debug symbols.][53774]
4912 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4913 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4915 [50911]: https://github.com/rust-lang/rust/pull/50911/
4916 [51363]: https://github.com/rust-lang/rust/pull/51363/
4917 [51366]: https://github.com/rust-lang/rust/pull/51366/
4918 [52081]: https://github.com/rust-lang/rust/pull/52081/
4919 [53003]: https://github.com/rust-lang/rust/pull/53003/
4920 [53033]: https://github.com/rust-lang/rust/pull/53033/
4921 [53044]: https://github.com/rust-lang/rust/pull/53044/
4922 [53165]: https://github.com/rust-lang/rust/pull/53165/
4923 [53611]: https://github.com/rust-lang/rust/pull/53611/
4924 [53236]: https://github.com/rust-lang/rust/pull/53236/
4925 [53272]: https://github.com/rust-lang/rust/pull/53272/
4926 [53370]: https://github.com/rust-lang/rust/pull/53370/
4927 [53459]: https://github.com/rust-lang/rust/pull/53459/
4928 [53774]: https://github.com/rust-lang/rust/pull/53774/
4929 [53822]: https://github.com/rust-lang/rust/pull/53822/
4930 [54057]: https://github.com/rust-lang/rust/pull/54057/
4931 [54404]: https://github.com/rust-lang/rust/pull/54404/
4932 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4933 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4934 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4935 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4937 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4938 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4939 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4940 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4941 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4942 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4943 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4944 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4945 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4946 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4949 Version 1.29.2 (2018-10-11)
4950 ===========================
4952 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4953 - The `rls-preview` component on the windows-gnu targets has been restored.
4955 [54639]: https://github.com/rust-lang/rust/pull/54639
4958 Version 1.29.1 (2018-09-25)
4959 ===========================
4964 - The standard library's `str::repeat` function contained an out of bounds write
4965 caused by an integer overflow. This has been fixed by deterministically
4966 panicking when an overflow happens.
4968 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4972 Version 1.29.0 (2018-09-13)
4973 ==========================
4977 - [Bumped minimum LLVM version to 5.0.][51899]
4978 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4979 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4980 - [Upgraded to LLVM 7.][51966]
4984 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4985 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4986 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4987 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4989 - [`Cell<T>` now allows `T` to be unsized.][50494]
4990 - [`SocketAddr` is now stable on Redox.][52656]
4995 - [`Iterator::flatten`]
5000 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
5001 `--locked` to disable this behavior.
5002 - [`cargo-install` will now allow you to cross compile an install
5003 using `--target`.][cargo/5614]
5004 - [Added the `cargo-fix` subcommand to automatically move project code from
5005 2015 edition to 2018.][cargo/5723]
5006 - [`cargo doc` can now optionally document private types using the
5007 `--document-private-items` flag.][cargo/5543]
5011 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
5012 the specified level to that level.][52354] For example `--cap-lints warn`
5013 will demote `deny` and `forbid` lints to `warn`.
5014 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
5015 fails and `101` if there is a panic.][52197]
5016 - [A preview of clippy has been made available through rustup.][51122]
5017 You can install the preview with `rustup component add clippy-preview`.
5021 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
5022 Use `str::get_unchecked(begin..end)` instead.
5023 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
5024 Consider using the `home_dir` function from
5025 https://crates.io/crates/dirs instead.
5026 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
5027 - [`cfg` attributes and `--cfg` command line flags are now more
5028 strictly validated.][53893]
5030 [53893]: https://github.com/rust-lang/rust/pull/53893/
5031 [52861]: https://github.com/rust-lang/rust/pull/52861/
5032 [51966]: https://github.com/rust-lang/rust/pull/51966/
5033 [52656]: https://github.com/rust-lang/rust/pull/52656/
5034 [52239]: https://github.com/rust-lang/rust/pull/52239/
5035 [52330]: https://github.com/rust-lang/rust/pull/52330/
5036 [52354]: https://github.com/rust-lang/rust/pull/52354/
5037 [52402]: https://github.com/rust-lang/rust/pull/52402/
5038 [52197]: https://github.com/rust-lang/rust/pull/52197/
5039 [51807]: https://github.com/rust-lang/rust/pull/51807/
5040 [51899]: https://github.com/rust-lang/rust/pull/51899/
5041 [51912]: https://github.com/rust-lang/rust/pull/51912/
5042 [51619]: https://github.com/rust-lang/rust/pull/51619/
5043 [51656]: https://github.com/rust-lang/rust/pull/51656/
5044 [51178]: https://github.com/rust-lang/rust/pull/51178/
5045 [51122]: https://github.com/rust-lang/rust/pull/51122
5046 [50494]: https://github.com/rust-lang/rust/pull/50494/
5047 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
5048 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
5049 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
5050 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
5051 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
5052 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
5053 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
5056 Version 1.28.0 (2018-08-02)
5057 ===========================
5061 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
5062 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
5063 the inner type across Foreign Function Interface (FFI) boundaries.
5064 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
5065 and can now be used as identifiers.][51196]
5066 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
5067 stable.][51241] This will allow users to specify a global allocator for
5069 - [Unit test functions marked with the `#[test]` attribute can now return
5070 `Result<(), E: Debug>` in addition to `()`.][51298]
5071 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
5072 allows macros to easily target lifetimes.
5076 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
5077 prioritise making smaller binary sizes. `z` is the same as `s` with the
5078 exception that it does not vectorise loops, which typically results in an even
5080 - [The short error format is now stable.][49546] Specified with
5081 `--error-format=short` this option will provide a more compressed output of
5082 rust error messages.
5083 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
5084 - [Reduced the number of allocations in the macro parser.][50855] This can
5085 improve compile times of macro heavy crates on average by 5%.
5089 - [Implemented `Default` for `&mut str`.][51306]
5090 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
5091 - [Implemented `Extend` for `()`.][50234]
5092 - [The `Debug` implementation of `time::Duration` should now be more easily
5093 human readable.][50364] Previously a `Duration` of one second would printed as
5094 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
5095 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
5096 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
5097 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
5098 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
5099 for `PathBuf`.][50170]
5100 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
5101 and `Wrapping<i128>`.][50465]
5102 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
5103 possible.][51050] This can provide up to a 40% speed increase.
5104 - [Improved error messages when using `format!`.][50610]
5108 - [`Iterator::step_by`]
5109 - [`Path::ancestors`]
5110 - [`SystemTime::UNIX_EPOCH`]
5111 - [`alloc::GlobalAlloc`]
5113 - [`alloc::LayoutErr`]
5116 - [`alloc::alloc_zeroed`]
5117 - [`alloc::dealloc`]
5118 - [`alloc::realloc`]
5119 - [`alloc::handle_alloc_error`]
5120 - [`btree_map::Entry::or_default`]
5121 - [`fmt::Alignment`]
5122 - [`hash_map::Entry::or_default`]
5123 - [`iter::repeat_with`]
5124 - [`num::NonZeroUsize`]
5125 - [`num::NonZeroU128`]
5126 - [`num::NonZeroU16`]
5127 - [`num::NonZeroU32`]
5128 - [`num::NonZeroU64`]
5129 - [`num::NonZeroU8`]
5130 - [`ops::RangeBounds`]
5131 - [`slice::SliceIndex`]
5132 - [`slice::from_mut`]
5133 - [`slice::from_ref`]
5134 - [`{Any + Send + Sync}::downcast_mut`]
5135 - [`{Any + Send + Sync}::downcast_ref`]
5136 - [`{Any + Send + Sync}::is`]
5140 - [Cargo will now no longer allow you to publish crates with build scripts that
5141 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
5142 considered to be immutable.
5146 - [The `suggestion_applicability` field in `rustc`'s json output is now
5147 stable.][50486] This will allow dev tools to check whether a code suggestion
5148 would apply to them.
5152 - [Rust will consider trait objects with duplicated constraints to be the same
5153 type as without the duplicated constraint.][51276] For example the below code will
5154 now fail to compile.
5159 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
5162 impl Trait + Send + Send {
5163 fn test(&self) { println!("two"); }
5167 [49546]: https://github.com/rust-lang/rust/pull/49546/
5168 [50143]: https://github.com/rust-lang/rust/pull/50143/
5169 [50170]: https://github.com/rust-lang/rust/pull/50170/
5170 [50234]: https://github.com/rust-lang/rust/pull/50234/
5171 [50265]: https://github.com/rust-lang/rust/pull/50265/
5172 [50364]: https://github.com/rust-lang/rust/pull/50364/
5173 [50385]: https://github.com/rust-lang/rust/pull/50385/
5174 [50465]: https://github.com/rust-lang/rust/pull/50465/
5175 [50486]: https://github.com/rust-lang/rust/pull/50486/
5176 [50554]: https://github.com/rust-lang/rust/pull/50554/
5177 [50610]: https://github.com/rust-lang/rust/pull/50610/
5178 [50855]: https://github.com/rust-lang/rust/pull/50855/
5179 [51050]: https://github.com/rust-lang/rust/pull/51050/
5180 [51196]: https://github.com/rust-lang/rust/pull/51196/
5181 [51241]: https://github.com/rust-lang/rust/pull/51241/
5182 [51276]: https://github.com/rust-lang/rust/pull/51276/
5183 [51298]: https://github.com/rust-lang/rust/pull/51298/
5184 [51306]: https://github.com/rust-lang/rust/pull/51306/
5185 [51562]: https://github.com/rust-lang/rust/pull/51562/
5186 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
5187 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
5188 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5189 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5190 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5191 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5192 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5193 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5194 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5195 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5196 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5197 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5198 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5199 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5200 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5201 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5202 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5203 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5204 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5205 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5206 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5207 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5208 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5209 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5210 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5211 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5212 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5213 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5214 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5215 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5217 Version 1.27.2 (2018-07-20)
5218 ===========================
5223 - The borrow checker was fixed to avoid potential unsoundness when using
5224 match ergonomics: [#52213][52213].
5226 [52213]: https://github.com/rust-lang/rust/issues/52213
5228 Version 1.27.1 (2018-07-10)
5229 ===========================
5234 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5235 when running, which enabled executing code as some other user on a
5236 given machine. This release fixes that vulnerability; you can read
5237 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5239 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5244 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5245 match ergonomics: [#51415][51415], [#49534][49534].
5247 [51415]: https://github.com/rust-lang/rust/issues/51415
5248 [49534]: https://github.com/rust-lang/rust/issues/49534
5249 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5250 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5252 Version 1.27.0 (2018-06-21)
5253 ==========================
5257 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5258 be used as an identifier.
5259 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5260 bare `Trait` syntax, and should make it clearer when being used in tandem with
5261 `impl Trait` because it is equivalent to the following syntax:
5262 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5263 `Box<Trait> == Box<dyn Trait>`.
5264 - [Attributes on generic parameters such as types and lifetimes are
5265 now stable.][48851] e.g.
5266 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5267 - [The `#[must_use]` attribute can now also be used on functions as well as
5268 types.][48925] It provides a lint that by default warns users when the
5269 value returned by a function has not been used.
5273 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5277 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5278 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5279 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5280 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5281 the `cfg` attribute.
5282 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5283 std are now available in core.][49896]
5284 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5286 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5287 that the operation isn't done in place.
5288 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5289 the `#[must_use]` attribute][49533] to warn about unused potentially
5290 expensive allocations.
5294 - [`DoubleEndedIterator::rfind`]
5295 - [`DoubleEndedIterator::rfold`]
5296 - [`DoubleEndedIterator::try_rfold`]
5297 - [`Duration::from_micros`]
5298 - [`Duration::from_nanos`]
5299 - [`Duration::subsec_micros`]
5300 - [`Duration::subsec_millis`]
5301 - [`HashMap::remove_entry`]
5302 - [`Iterator::try_fold`]
5303 - [`Iterator::try_for_each`]
5305 - [`Option::filter`]
5306 - [`String::replace_range`]
5307 - [`Take::set_limit`]
5308 - [`hint::unreachable_unchecked`]
5309 - [`os::unix::process::parent_id`]
5310 - [`ptr::swap_nonoverlapping`]
5311 - [`slice::rsplit_mut`]
5313 - [`slice::swap_with_slice`]
5317 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5318 `readme`, and `repository` fields.][cargo/5386]
5319 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5320 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5321 a different directory than `target` for placing compilation artifacts.
5322 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5323 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5324 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5325 where cargo would infer a binary, Cargo will produce a warning. You can
5326 disable this feature ahead of time by setting any of the following to false:
5327 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5328 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5329 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5333 - [Added “The Rustc book” into the official documentation.][49707]
5334 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5335 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5339 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5340 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5341 compile, `"".is_empty()` will still compile.
5342 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5343 will only print the inner type.][48553] E.g.
5344 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5345 not `AtomicBool(true)`.
5346 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5347 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5348 alignment should cover all use cases.
5349 - The `.description()` method on the `std::error::Error` trait
5350 [has been soft-deprecated][50163]. It is no longer required to implement it.
5352 [48553]: https://github.com/rust-lang/rust/pull/48553/
5353 [48851]: https://github.com/rust-lang/rust/pull/48851/
5354 [48925]: https://github.com/rust-lang/rust/pull/48925/
5355 [49533]: https://github.com/rust-lang/rust/pull/49533/
5356 [49623]: https://github.com/rust-lang/rust/pull/49623/
5357 [49630]: https://github.com/rust-lang/rust/pull/49630/
5358 [49664]: https://github.com/rust-lang/rust/pull/49664/
5359 [49699]: https://github.com/rust-lang/rust/pull/49699/
5360 [49707]: https://github.com/rust-lang/rust/pull/49707/
5361 [49896]: https://github.com/rust-lang/rust/pull/49896/
5362 [49968]: https://github.com/rust-lang/rust/pull/49968/
5363 [50163]: https://github.com/rust-lang/rust/pull/50163
5364 [50177]: https://github.com/rust-lang/rust/pull/50177/
5365 [50378]: https://github.com/rust-lang/rust/pull/50378/
5366 [50423]: https://github.com/rust-lang/rust/pull/50423/
5367 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5368 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5369 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5370 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5371 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5372 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5373 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5374 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5375 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5376 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5377 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5378 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5379 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5380 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5381 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5382 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5383 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5384 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5385 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5386 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5387 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5388 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5389 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5390 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5391 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5392 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5393 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5394 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5395 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5398 Version 1.26.2 (2018-06-05)
5399 ==========================
5404 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5406 [51117]: https://github.com/rust-lang/rust/issues/51117
5409 Version 1.26.1 (2018-05-29)
5410 ==========================
5415 - [RLS now works on Windows.][50646]
5416 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5422 - [`fn main() -> impl Trait` no longer works for non-Termination
5424 This reverts an accidental stabilization.
5425 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5426 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5428 [50646]: https://github.com/rust-lang/rust/issues/50646
5429 [50656]: https://github.com/rust-lang/rust/pull/50656
5430 [50812]: https://github.com/rust-lang/rust/pull/50812
5431 [50950]: https://github.com/rust-lang/rust/issues/50950
5432 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5434 Version 1.26.0 (2018-05-10)
5435 ==========================
5439 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5440 implement either or both traits.][49299]
5441 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5442 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5443 lifetime can be elided.][49458]
5444 - [`impl Trait` is now stable allowing you to have abstract types in returns
5445 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5446 `fn open(path: impl AsRef<Path>)`.
5447 - [Pattern matching will now automatically apply dereferences.][49394]
5448 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5449 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5450 - [A lot of operations are now available in a const context.][46882] E.g. You
5451 can now index into constant arrays, reference and dereference into constants,
5452 and use tuple struct constructors.
5453 - [Fixed entry slice patterns are now stable.][48516] E.g.
5455 let points = [1, 2, 3, 4];
5457 [1, 2, 3, 4] => println!("All points were sequential."),
5458 _ => println!("Not all points were sequential."),
5465 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5466 - [Fixed exponential projection complexity on nested types.][48296]
5467 This can provide up to a ~12% reduction in compile times for certain crates.
5468 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5469 to remap path prefixes outputted by the compiler.
5470 - [Added `powerpc-unknown-netbsd` target.][48281]
5474 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5475 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5476 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5477 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5478 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5479 - [`ascii::escape_default` is now available in libcore.][48735]
5480 - [Trailing commas are now supported in std and core macros.][48056]
5481 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5482 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5487 - [`*const T::copy_to_nonoverlapping`]
5488 - [`*const T::copy_to`]
5489 - [`*const T::read_unaligned`]
5490 - [`*const T::read_volatile`]
5491 - [`*const T::read`]
5493 - [`*const T::wrapping_add`]
5494 - [`*const T::wrapping_sub`]
5496 - [`*mut T::copy_to_nonoverlapping`]
5497 - [`*mut T::copy_to`]
5498 - [`*mut T::read_unaligned`]
5499 - [`*mut T::read_volatile`]
5501 - [`*mut T::replace`]
5504 - [`*mut T::wrapping_add`]
5505 - [`*mut T::wrapping_sub`]
5506 - [`*mut T::write_bytes`]
5507 - [`*mut T::write_unaligned`]
5508 - [`*mut T::write_volatile`]
5511 - [`FromUtf8Error::as_bytes`]
5512 - [`LocalKey::try_with`]
5513 - [`Option::cloned`]
5514 - [`btree_map::Entry::and_modify`]
5515 - [`fs::read_to_string`]
5518 - [`hash_map::Entry::and_modify`]
5519 - [`iter::FusedIterator`]
5520 - [`ops::RangeInclusive`]
5521 - [`ops::RangeToInclusive`]
5523 - [`slice::rotate_left`]
5524 - [`slice::rotate_right`]
5525 - [`String::retain`]
5530 - [Cargo will now output path to custom commands when `-v` is
5531 passed with `--list`][cargo/5041]
5532 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5536 - [The second edition of "The Rust Programming Language" book is now recommended
5537 over the first.][48404]
5542 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5543 syntax is now invalid.
5545 use std::ops::Fn as dyn;
5546 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5548 - [The result of dereferences are no longer promoted to `'static`.][47408]
5552 const PAIR: &(i32, i32) = &(0, 1);
5553 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5556 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5557 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5559 - [Removed hoedown from rustdoc.][48274]
5560 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5562 [46882]: https://github.com/rust-lang/rust/pull/46882
5563 [47379]: https://github.com/rust-lang/rust/pull/47379
5564 [47408]: https://github.com/rust-lang/rust/pull/47408
5565 [47813]: https://github.com/rust-lang/rust/pull/47813
5566 [48056]: https://github.com/rust-lang/rust/pull/48056
5567 [48125]: https://github.com/rust-lang/rust/pull/48125
5568 [48235]: https://github.com/rust-lang/rust/pull/48235
5569 [48274]: https://github.com/rust-lang/rust/pull/48274
5570 [48281]: https://github.com/rust-lang/rust/pull/48281
5571 [48296]: https://github.com/rust-lang/rust/pull/48296
5572 [48326]: https://github.com/rust-lang/rust/pull/48326
5573 [48359]: https://github.com/rust-lang/rust/pull/48359
5574 [48404]: https://github.com/rust-lang/rust/pull/48404
5575 [48481]: https://github.com/rust-lang/rust/pull/48481
5576 [48516]: https://github.com/rust-lang/rust/pull/48516
5577 [48628]: https://github.com/rust-lang/rust/pull/48628
5578 [48629]: https://github.com/rust-lang/rust/pull/48629
5579 [48657]: https://github.com/rust-lang/rust/pull/48657
5580 [48735]: https://github.com/rust-lang/rust/pull/48735
5581 [48978]: https://github.com/rust-lang/rust/pull/48978
5582 [49101]: https://github.com/rust-lang/rust/pull/49101
5583 [49109]: https://github.com/rust-lang/rust/pull/49109
5584 [49162]: https://github.com/rust-lang/rust/pull/49162
5585 [49255]: https://github.com/rust-lang/rust/pull/49255
5586 [49299]: https://github.com/rust-lang/rust/pull/49299
5587 [49305]: https://github.com/rust-lang/rust/pull/49305
5588 [49394]: https://github.com/rust-lang/rust/pull/49394
5589 [49458]: https://github.com/rust-lang/rust/pull/49458
5590 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5591 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5592 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5593 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5594 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5595 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5596 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5597 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5598 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5599 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5600 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5601 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5602 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5603 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5604 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5605 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5606 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5607 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5608 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5609 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5610 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5611 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5612 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5613 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5614 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5615 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5616 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5617 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5618 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5619 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5620 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5621 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5622 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5623 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5624 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5625 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5626 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5627 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5628 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5629 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5630 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5631 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5634 Version 1.25.0 (2018-03-29)
5635 ==========================
5639 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5640 - [You can now use nested groups of imports.][47948]
5641 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5642 - [You can now have `|` at the start of a match arm.][47947] e.g.
5644 enum Foo { A, B, C }
5650 | Foo::B => println!("AB"),
5651 | Foo::C => println!("C"),
5658 - [Upgraded to LLVM 6.][47828]
5659 - [Added `-C lto=val` option.][47521]
5660 - [Added `i586-unknown-linux-musl` target][47282]
5664 - [Impl Send for `process::Command` on Unix.][47760]
5665 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5666 - [`UnsafeCell::into_inner` is now safe.][47204]
5667 - [Implement libstd for CloudABI.][47268]
5668 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5669 - [Implement `AsRef<Path>` for Component][46985]
5670 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5671 - [Moved `Duration` to libcore.][46666]
5675 - [`Location::column`]
5678 The following functions can now be used in a constant expression.
5679 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5680 - [`Duration::new`][47300]
5681 - [`Duration::from_secs`][47300]
5682 - [`Duration::from_millis`][47300]
5686 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5687 - [`cargo new` now defaults to creating a binary crate, instead of a
5688 library crate.][cargo/5029]
5692 - [Rust by example is now shipped with new releases][46196]
5696 - [Deprecated `net::lookup_host`.][47510]
5697 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5698 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5699 around indexing operations (see [#47349][47349]). This has been fixed (which also
5700 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5701 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5703 [33903]: https://github.com/rust-lang/rust/pull/33903
5704 [47947]: https://github.com/rust-lang/rust/pull/47947
5705 [47948]: https://github.com/rust-lang/rust/pull/47948
5706 [47760]: https://github.com/rust-lang/rust/pull/47760
5707 [47790]: https://github.com/rust-lang/rust/pull/47790
5708 [47828]: https://github.com/rust-lang/rust/pull/47828
5709 [47398]: https://github.com/rust-lang/rust/pull/47398
5710 [47510]: https://github.com/rust-lang/rust/pull/47510
5711 [47521]: https://github.com/rust-lang/rust/pull/47521
5712 [47204]: https://github.com/rust-lang/rust/pull/47204
5713 [47251]: https://github.com/rust-lang/rust/pull/47251
5714 [47268]: https://github.com/rust-lang/rust/pull/47268
5715 [47282]: https://github.com/rust-lang/rust/pull/47282
5716 [47300]: https://github.com/rust-lang/rust/pull/47300
5717 [47349]: https://github.com/rust-lang/rust/pull/47349
5718 [46931]: https://github.com/rust-lang/rust/pull/46931
5719 [46985]: https://github.com/rust-lang/rust/pull/46985
5720 [47006]: https://github.com/rust-lang/rust/pull/47006
5721 [46830]: https://github.com/rust-lang/rust/pull/46830
5722 [46095]: https://github.com/rust-lang/rust/pull/46095
5723 [46666]: https://github.com/rust-lang/rust/pull/46666
5724 [46196]: https://github.com/rust-lang/rust/pull/46196
5725 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5726 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5727 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5728 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5729 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5732 Version 1.24.1 (2018-03-01)
5733 ==========================
5735 - [Do not abort when unwinding through FFI][48251]
5736 - [Emit UTF-16 files for linker arguments on Windows][48318]
5737 - [Make the error index generator work again][48308]
5738 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5740 [48251]: https://github.com/rust-lang/rust/issues/48251
5741 [48308]: https://github.com/rust-lang/rust/issues/48308
5742 [48318]: https://github.com/rust-lang/rust/issues/48318
5743 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5746 Version 1.24.0 (2018-02-15)
5747 ==========================
5751 - [External `sysv64` ffi is now available.][46528]
5752 eg. `extern "sysv64" fn foo () {}`
5756 - [rustc now uses 16 codegen units by default for release builds.][46910]
5757 For the fastest builds, utilize `codegen-units=1`.
5758 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5759 - [Add `aarch64-unknown-openbsd` support][46760]
5763 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5764 improvement in performance in the majority of cases.
5765 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5766 with Windows.][46798]
5767 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5768 - [impl `From<bool>` for `AtomicBool`][46293]
5769 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5770 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5771 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5772 - [float::from_bits now just uses transmute.][46012] This provides
5773 some optimisations from LLVM.
5774 - [Copied `AsciiExt` methods onto `char`][46077]
5775 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5776 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5777 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5778 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5782 - [`RefCell::replace`]
5784 - [`atomic::spin_loop_hint`]
5786 The following functions can now be used in a constant expression.
5787 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5789 - [`AtomicBool::new`][46287]
5790 - [`AtomicUsize::new`][46287]
5791 - [`AtomicIsize::new`][46287]
5792 - [`AtomicPtr::new`][46287]
5793 - [`Cell::new`][46287]
5794 - [`{integer}::min_value`][46287]
5795 - [`{integer}::max_value`][46287]
5796 - [`mem::size_of`][46287]
5797 - [`mem::align_of`][46287]
5798 - [`ptr::null`][46287]
5799 - [`ptr::null_mut`][46287]
5800 - [`RefCell::new`][46287]
5801 - [`UnsafeCell::new`][46287]
5805 - [Added a `workspace.default-members` config that
5806 overrides implied `--all` in virtual workspaces.][cargo/4743]
5807 - [Enable incremental by default on development builds.][cargo/4817] Also added
5808 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5809 per-project or global basis respectively.
5816 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5817 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5818 in accordance with IETF RFC 4291 §2.2.
5819 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5820 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5821 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5822 - [Leading zeros in tuple struct members is now an error][47084]
5823 - [`column!()` macro is one-based instead of zero-based][46977]
5824 - [`fmt::Arguments` can no longer be shared across threads][45198]
5825 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5826 - [Cargo sets a different working directory for the compiler][cargo/4788]
5828 [44884]: https://github.com/rust-lang/rust/pull/44884
5829 [45198]: https://github.com/rust-lang/rust/pull/45198
5830 [45506]: https://github.com/rust-lang/rust/pull/45506
5831 [45990]: https://github.com/rust-lang/rust/pull/45990
5832 [46012]: https://github.com/rust-lang/rust/pull/46012
5833 [46077]: https://github.com/rust-lang/rust/pull/46077
5834 [46094]: https://github.com/rust-lang/rust/pull/46094
5835 [46284]: https://github.com/rust-lang/rust/pull/46284
5836 [46287]: https://github.com/rust-lang/rust/pull/46287
5837 [46293]: https://github.com/rust-lang/rust/pull/46293
5838 [46528]: https://github.com/rust-lang/rust/pull/46528
5839 [46671]: https://github.com/rust-lang/rust/pull/46671
5840 [46713]: https://github.com/rust-lang/rust/pull/46713
5841 [46735]: https://github.com/rust-lang/rust/pull/46735
5842 [46760]: https://github.com/rust-lang/rust/pull/46760
5843 [46798]: https://github.com/rust-lang/rust/pull/46798
5844 [46828]: https://github.com/rust-lang/rust/pull/46828
5845 [46831]: https://github.com/rust-lang/rust/pull/46831
5846 [46833]: https://github.com/rust-lang/rust/pull/46833
5847 [46910]: https://github.com/rust-lang/rust/pull/46910
5848 [46977]: https://github.com/rust-lang/rust/pull/46977
5849 [47018]: https://github.com/rust-lang/rust/pull/47018
5850 [47080]: https://github.com/rust-lang/rust/pull/47080
5851 [47084]: https://github.com/rust-lang/rust/pull/47084
5852 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5853 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5854 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5855 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5856 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5857 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5860 Version 1.23.0 (2018-01-04)
5861 ==========================
5865 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5866 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5867 Which should fix some confusing errors in some operations.
5871 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5872 undefined behavior.][45920]
5873 - [rustc now suggests renaming import if names clash.][45660]
5874 - [Display errors/warnings correctly when there are zero-width or
5875 wide characters.][45711]
5876 - [rustc now avoids unnecessary copies of arguments that are
5877 simple bindings][45380] This should improve memory usage on average by 5-10%.
5878 - [Updated musl used to build musl rustc to 1.1.17][45393]
5882 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5883 - [Implement Hash for raw pointers to unsized types][45483]
5884 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5885 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5886 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5887 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5888 and `<*mut T>::as_mut`][44932]
5889 - [Optimized `Thread::{park, unpark}` implementation][45524]
5890 - [Improved `SliceExt::binary_search` performance.][45333]
5891 - [impl `FromIterator<()>` for `()`][45379]
5892 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5900 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5901 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5902 - [Added unit test checking to `cargo check`][cargo/4592]
5903 - [Cargo now lets you install a specific version
5904 using `cargo install --version`][cargo/4637]
5908 - [Releases now ship with the Cargo book documentation.][45692]
5909 - [rustdoc now prints rendering warnings on every run.][45324]
5913 - [Changes have been made to type equality to make it more correct,
5914 in rare cases this could break some code.][45853] [Tracking issue for
5915 further information][45852]
5916 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5917 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5918 Android 9, the minimum supported version is Android 14.
5919 - [Bumped the minimum LLVM to 3.9][45326]
5921 [44042]: https://github.com/rust-lang/rust/pull/44042
5922 [44932]: https://github.com/rust-lang/rust/pull/44932
5923 [45267]: https://github.com/rust-lang/rust/pull/45267
5924 [45324]: https://github.com/rust-lang/rust/pull/45324
5925 [45326]: https://github.com/rust-lang/rust/pull/45326
5926 [45333]: https://github.com/rust-lang/rust/pull/45333
5927 [45379]: https://github.com/rust-lang/rust/pull/45379
5928 [45380]: https://github.com/rust-lang/rust/pull/45380
5929 [45393]: https://github.com/rust-lang/rust/pull/45393
5930 [45435]: https://github.com/rust-lang/rust/pull/45435
5931 [45483]: https://github.com/rust-lang/rust/pull/45483
5932 [45524]: https://github.com/rust-lang/rust/pull/45524
5933 [45571]: https://github.com/rust-lang/rust/pull/45571
5934 [45580]: https://github.com/rust-lang/rust/pull/45580
5935 [45610]: https://github.com/rust-lang/rust/pull/45610
5936 [45660]: https://github.com/rust-lang/rust/pull/45660
5937 [45692]: https://github.com/rust-lang/rust/pull/45692
5938 [45711]: https://github.com/rust-lang/rust/pull/45711
5939 [45772]: https://github.com/rust-lang/rust/pull/45772
5940 [45852]: https://github.com/rust-lang/rust/issues/45852
5941 [45853]: https://github.com/rust-lang/rust/pull/45853
5942 [45887]: https://github.com/rust-lang/rust/pull/45887
5943 [45920]: https://github.com/rust-lang/rust/pull/45920
5944 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5945 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5946 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5949 Version 1.22.1 (2017-11-22)
5950 ==========================
5952 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5954 [46183]: https://github.com/rust-lang/rust/pull/46183
5956 Version 1.22.0 (2017-11-22)
5957 ==========================
5961 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5962 - [Now accepts underscores in unicode escapes][43716]
5963 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5964 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5968 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5969 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5970 This should decrease compile times for debug builds.
5971 - [strict memory alignment now enabled on ARMv6][45094]
5972 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5976 - [Allow atomic operations up to 32 bits
5977 on `armv5te_unknown_linux_gnueabi`][44978]
5978 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5979 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5980 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5981 - [Properly detect overflow in `Instant += Duration`.][44220]
5982 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5983 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5984 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5991 - [Cargo will now build multi file examples in subdirectories of the `examples`
5992 folder that have a `main.rs` file.][cargo/4496]
5993 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5994 the old format will continue to work and can be updated with `cargo update`.
5995 - [Now supports vendoring git repositories][cargo/3992]
5999 - [`libbacktrace` is now available on Apple platforms.][44251]
6000 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
6001 This now lets you specify that a given code example will fail to compile.
6005 - [The minimum Android version that rustc can build for has been bumped
6006 to `4.0` from `2.3`][45656]
6007 - [Allowing `T op= &T` for numeric types has broken some type
6008 inference cases][45480]
6011 [42526]: https://github.com/rust-lang/rust/pull/42526
6012 [43716]: https://github.com/rust-lang/rust/pull/43716
6013 [43949]: https://github.com/rust-lang/rust/pull/43949
6014 [44015]: https://github.com/rust-lang/rust/pull/44015
6015 [44220]: https://github.com/rust-lang/rust/pull/44220
6016 [44251]: https://github.com/rust-lang/rust/pull/44251
6017 [44287]: https://github.com/rust-lang/rust/pull/44287
6018 [44303]: https://github.com/rust-lang/rust/pull/44303
6019 [44456]: https://github.com/rust-lang/rust/pull/44456
6020 [44466]: https://github.com/rust-lang/rust/pull/44466
6021 [44895]: https://github.com/rust-lang/rust/pull/44895
6022 [44966]: https://github.com/rust-lang/rust/pull/44966
6023 [44978]: https://github.com/rust-lang/rust/pull/44978
6024 [45041]: https://github.com/rust-lang/rust/pull/45041
6025 [45064]: https://github.com/rust-lang/rust/pull/45064
6026 [45075]: https://github.com/rust-lang/rust/pull/45075
6027 [45094]: https://github.com/rust-lang/rust/pull/45094
6028 [45095]: https://github.com/rust-lang/rust/pull/45095
6029 [45480]: https://github.com/rust-lang/rust/issues/45480
6030 [45656]: https://github.com/rust-lang/rust/pull/45656
6031 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
6032 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
6033 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
6040 Version 1.21.0 (2017-10-12)
6041 ==========================
6045 - [You can now use static references for literals.][43838]
6049 let x: &'static u32 = &0;
6052 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
6055 my_macro!(Vec<i32>::new); // Always worked
6056 my_macro!(Vec::<i32>::new); // Now works
6061 - [Upgraded jemalloc to 4.5.0][43911]
6062 - [Enabled unwinding panics on Redox][43917]
6063 - [Now runs LLVM in parallel during translation phase.][43506]
6064 This should reduce peak memory usage.
6068 - [Generate builtin impls for `Clone` for all arrays and tuples that
6069 are `T: Clone`][43690]
6070 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
6071 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
6072 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
6077 [`std::mem::discriminant`]
6081 - [You can now call `cargo install` with multiple package names][cargo/4216]
6082 - [Cargo commands inside a virtual workspace will now implicitly
6083 pass `--all`][cargo/4335]
6084 - [Added a `[patch]` section to `Cargo.toml` to handle
6085 prepublication dependencies][cargo/4123] [RFC 1969]
6086 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
6087 like patterns][cargo/4270]
6088 - [Added the `--all-targets` option][cargo/4400]
6089 - [Using required dependencies as a feature is now deprecated and emits
6090 a warning][cargo/4364]
6095 - [Cargo docs are moving][43916]
6096 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
6097 - [The rustdoc book is now available][43863]
6098 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
6099 - [Added a preview of RLS has been made available through rustup][44204]
6100 Install with `rustup component add rls-preview`
6101 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
6102 Previously only showed `std::os::unix`.
6106 - [Changes in method matching against higher-ranked types][43880] This may cause
6107 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
6108 - [rustc's JSON error output's byte position start at top of file.][42973]
6109 Was previously relative to the rustc's internal `CodeMap` struct which
6110 required the unstable library `libsyntax` to correctly use.
6111 - [`unused_results` lint no longer ignores booleans][43728]
6113 [42565]: https://github.com/rust-lang/rust/pull/42565
6114 [42973]: https://github.com/rust-lang/rust/pull/42973
6115 [43348]: https://github.com/rust-lang/rust/pull/43348
6116 [43459]: https://github.com/rust-lang/rust/pull/43459
6117 [43506]: https://github.com/rust-lang/rust/pull/43506
6118 [43540]: https://github.com/rust-lang/rust/pull/43540
6119 [43690]: https://github.com/rust-lang/rust/pull/43690
6120 [43728]: https://github.com/rust-lang/rust/pull/43728
6121 [43838]: https://github.com/rust-lang/rust/pull/43838
6122 [43863]: https://github.com/rust-lang/rust/pull/43863
6123 [43880]: https://github.com/rust-lang/rust/pull/43880
6124 [43911]: https://github.com/rust-lang/rust/pull/43911
6125 [43916]: https://github.com/rust-lang/rust/pull/43916
6126 [43917]: https://github.com/rust-lang/rust/pull/43917
6127 [44204]: https://github.com/rust-lang/rust/pull/44204
6128 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
6129 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
6130 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
6131 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
6132 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
6133 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
6134 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
6135 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
6136 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
6138 Version 1.20.0 (2017-08-31)
6139 ===========================
6143 - [Associated constants are now stabilised.][42809]
6144 - [A lot of macro bugs are now fixed.][42913]
6149 - [Struct fields are now properly coerced to the expected field type.][42807]
6150 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
6151 `wasm32-experimental-emscripten` target.
6152 - [Changed some of the error messages to be more helpful.][42033]
6153 - [Add support for RELRO(RELocation Read-Only) for platforms that support
6155 - [rustc now reports the total number of errors on compilation failure][43015]
6156 previously this was only the number of errors in the pass that failed.
6157 - [Expansion in rustc has been sped up 29x.][42533]
6158 - [added `msp430-none-elf` target.][43099]
6159 - [rustc will now suggest one-argument enum variant to fix type mismatch when
6161 - [Fixes backtraces on Redox][43228]
6162 - [rustc now identifies different versions of same crate when absolute paths of
6163 different types match in an error message.][42826]
6169 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
6170 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
6172 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
6173 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
6174 - [Impl `Clone` for `DefaultHasher`.][42799]
6175 - [Impl `Sync` for `SyncSender`.][42397]
6176 - [Impl `FromStr` for `char`][42271]
6177 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
6179 - [allow messages in the `unimplemented!()` macro.][42155]
6180 ie. `unimplemented!("Waiting for 1.21 to be stable")`
6181 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
6182 - [Upgrade to Unicode 10.0.0][42999]
6183 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
6184 - [Skip the main thread's manual stack guard on Linux][43072]
6185 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
6186 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
6188 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6193 - [`CStr::into_c_string`]
6194 - [`CString::as_c_str`]
6195 - [`CString::into_boxed_c_str`]
6196 - [`Chain::get_mut`]
6197 - [`Chain::get_ref`]
6198 - [`Chain::into_inner`]
6199 - [`Option::get_or_insert_with`]
6200 - [`Option::get_or_insert`]
6201 - [`OsStr::into_os_string`]
6202 - [`OsString::into_boxed_os_str`]
6205 - [`Utf8Error::error_len`]
6206 - [`char::EscapeDebug`]
6207 - [`char::escape_debug`]
6208 - [`compile_error!`]
6209 - [`f32::from_bits`]
6211 - [`f64::from_bits`]
6213 - [`mem::ManuallyDrop`]
6214 - [`slice::sort_unstable_by_key`]
6215 - [`slice::sort_unstable_by`]
6216 - [`slice::sort_unstable`]
6217 - [`str::from_boxed_utf8_unchecked`]
6218 - [`str::as_bytes_mut`]
6219 - [`str::as_bytes_mut`]
6220 - [`str::from_utf8_mut`]
6221 - [`str::from_utf8_unchecked_mut`]
6223 - [`str::get_unchecked_mut`]
6224 - [`str::get_unchecked`]
6226 - [`str::into_boxed_bytes`]
6231 - [Cargo API token location moved from `~/.cargo/config` to
6232 `~/.cargo/credentials`.][cargo/3978]
6233 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6234 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6235 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6236 - [You can now specify version of a binary when installed through
6237 `cargo install` using `--vers`.][cargo/4229]
6238 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6239 failure.][cargo/4248]
6240 - [Changed the convention around which file is the crate root.][cargo/4259]
6245 - [Functions with `'static` in their return types will now not be as usable as
6246 if they were using lifetime parameters instead.][42417]
6247 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6248 takes the sign of NaN into account where previously didn't.][42430]
6250 [42033]: https://github.com/rust-lang/rust/pull/42033
6251 [42155]: https://github.com/rust-lang/rust/pull/42155
6252 [42271]: https://github.com/rust-lang/rust/pull/42271
6253 [42397]: https://github.com/rust-lang/rust/pull/42397
6254 [42417]: https://github.com/rust-lang/rust/pull/42417
6255 [42430]: https://github.com/rust-lang/rust/pull/42430
6256 [42431]: https://github.com/rust-lang/rust/pull/42431
6257 [42533]: https://github.com/rust-lang/rust/pull/42533
6258 [42571]: https://github.com/rust-lang/rust/pull/42571
6259 [42613]: https://github.com/rust-lang/rust/pull/42613
6260 [42799]: https://github.com/rust-lang/rust/pull/42799
6261 [42807]: https://github.com/rust-lang/rust/pull/42807
6262 [42809]: https://github.com/rust-lang/rust/pull/42809
6263 [42822]: https://github.com/rust-lang/rust/pull/42822
6264 [42826]: https://github.com/rust-lang/rust/pull/42826
6265 [42854]: https://github.com/rust-lang/rust/pull/42854
6266 [42913]: https://github.com/rust-lang/rust/pull/42913
6267 [42999]: https://github.com/rust-lang/rust/pull/42999
6268 [43011]: https://github.com/rust-lang/rust/pull/43011
6269 [43015]: https://github.com/rust-lang/rust/pull/43015
6270 [43072]: https://github.com/rust-lang/rust/pull/43072
6271 [43077]: https://github.com/rust-lang/rust/pull/43077
6272 [43097]: https://github.com/rust-lang/rust/pull/43097
6273 [43099]: https://github.com/rust-lang/rust/pull/43099
6274 [43170]: https://github.com/rust-lang/rust/pull/43170
6275 [43178]: https://github.com/rust-lang/rust/pull/43178
6276 [43185]: https://github.com/rust-lang/rust/pull/43185
6277 [43228]: https://github.com/rust-lang/rust/pull/43228
6278 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6279 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6280 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6281 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6282 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6283 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6284 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6285 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6286 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6287 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6288 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6289 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6290 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6291 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6292 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6293 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6294 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6295 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6296 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6297 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6298 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6299 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6300 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6301 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6302 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6303 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6304 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6305 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6306 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6307 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6308 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6309 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6310 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6311 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6312 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6313 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6314 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6315 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6318 Version 1.19.0 (2017-07-20)
6319 ===========================
6324 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6325 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6326 - [Macro recursion limit increased to 1024 from 64.][41676]
6327 - [Added lint for detecting unused macros.][41907]
6328 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6329 For example: `let x = loop { break 7; };`
6330 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6331 contain `Copy` types and cannot have a `Drop` implementation.
6332 Example: `union Foo { bar: u8, baz: usize }`
6333 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6334 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6339 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6340 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6341 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6342 you should use `--target armv7-linux-androideabi`.
6343 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6344 - [Minor optimisation of string operations.][42037]
6345 - [Compiler error message is now `aborting due to previous error(s)` instead of
6346 `aborting due to N previous errors`][42150] This was previously inaccurate and
6347 would only count certain kinds of errors.
6348 - [The compiler now supports Visual Studio 2017][42225]
6349 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6350 - [Added a lot][42264] of [new error codes][42302]
6351 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6352 libraries with C Run-time Libraries(CRT) to be statically linked.
6353 - [Fixed various ARM codegen bugs][42740]
6358 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6359 `Extend<Cow<'a, str>>`][41449]
6360 - [`Vec` now implements `From<&mut [T]>`][41530]
6361 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6362 - [`SplitWhitespace` now implements `Clone`][41659]
6363 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6365 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6366 macros, but for printing to stderr.
6371 - [`OsString::shrink_to_fit`]
6374 - [`thread::ThreadId`]
6379 - [Build scripts can now add environment variables to the environment
6380 the crate is being compiled in.
6381 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6382 - [Subcommands now replace the current process rather than spawning a new
6383 child process][cargo/3970]
6384 - [Workspace members can now accept glob file patterns][cargo/3979]
6385 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6386 the members in a given workspace.][cargo/3988]
6387 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6388 - [Target directory path is now in the cargo metadata][cargo/4022]
6389 - [Cargo no longer checks out a local working directory for the
6390 crates.io index][cargo/4026] This should provide smaller file size for the
6391 registry, and improve cloning times, especially on Windows machines.
6392 - [Added an `--exclude` option for excluding certain packages when using the
6393 `--all` option][cargo/4031]
6394 - [Cargo will now automatically retry when receiving a 5xx error
6395 from crates.io][cargo/4032]
6396 - [The `--features` option now accepts multiple comma or space
6397 delimited values.][cargo/4084]
6398 - [Added support for custom target specific runners][cargo/3954]
6403 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6405 - [Rust will now release XZ compressed packages][rust-installer/57]
6406 - [rustup will now prefer to download rust packages with
6407 XZ compression][rustup/1100] over GZip packages.
6408 - [Added the ability to escape `#` in rust documentation][41785] By adding
6409 additional `#`'s ie. `##` is now `#`
6414 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6415 - [`-Z` flags are now no longer allowed to be used on the stable
6416 compiler.][41751] This has been a warning for a year previous to this.
6417 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6418 longer works][42844]. Users should migrate to the built-in `check`
6419 command, which has been available since 1.16.
6420 - [Ending a float literal with `._` is now a hard error.
6421 Example: `42._` .][41946]
6422 - [Any use of a private `extern crate` outside of its module is now a
6423 hard error.][36886] This was previously a warning.
6424 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6425 relative while the `::` prefix makes a path absolute, but was ignored and the
6426 path was relative regardless.
6427 - [Floating point constants in match patterns is now a hard error][36890]
6428 This was previously a warning.
6429 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6430 match patterns is now a hard error][36891] This was previously a warning.
6431 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6433 - [From the pound escape, lines consisting of multiple `#`s are
6435 - [It is an error to re-export private enum variants][42460]. This is
6436 known to break a number of crates that depend on an older version of
6438 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6439 to use it to find the linker, and the build will fail where it did
6440 not previously][42607]
6442 [36886]: https://github.com/rust-lang/rust/issues/36886
6443 [36888]: https://github.com/rust-lang/rust/issues/36888
6444 [36890]: https://github.com/rust-lang/rust/issues/36890
6445 [36891]: https://github.com/rust-lang/rust/issues/36891
6446 [36892]: https://github.com/rust-lang/rust/issues/36892
6447 [37406]: https://github.com/rust-lang/rust/issues/37406
6448 [39983]: https://github.com/rust-lang/rust/pull/39983
6449 [41145]: https://github.com/rust-lang/rust/pull/41145
6450 [41192]: https://github.com/rust-lang/rust/pull/41192
6451 [41258]: https://github.com/rust-lang/rust/pull/41258
6452 [41370]: https://github.com/rust-lang/rust/pull/41370
6453 [41449]: https://github.com/rust-lang/rust/pull/41449
6454 [41530]: https://github.com/rust-lang/rust/pull/41530
6455 [41624]: https://github.com/rust-lang/rust/pull/41624
6456 [41656]: https://github.com/rust-lang/rust/pull/41656
6457 [41659]: https://github.com/rust-lang/rust/pull/41659
6458 [41676]: https://github.com/rust-lang/rust/pull/41676
6459 [41751]: https://github.com/rust-lang/rust/pull/41751
6460 [41764]: https://github.com/rust-lang/rust/pull/41764
6461 [41785]: https://github.com/rust-lang/rust/pull/41785
6462 [41873]: https://github.com/rust-lang/rust/pull/41873
6463 [41907]: https://github.com/rust-lang/rust/pull/41907
6464 [41946]: https://github.com/rust-lang/rust/pull/41946
6465 [42016]: https://github.com/rust-lang/rust/pull/42016
6466 [42037]: https://github.com/rust-lang/rust/pull/42037
6467 [42068]: https://github.com/rust-lang/rust/pull/42068
6468 [42150]: https://github.com/rust-lang/rust/pull/42150
6469 [42162]: https://github.com/rust-lang/rust/pull/42162
6470 [42225]: https://github.com/rust-lang/rust/pull/42225
6471 [42264]: https://github.com/rust-lang/rust/pull/42264
6472 [42302]: https://github.com/rust-lang/rust/pull/42302
6473 [42460]: https://github.com/rust-lang/rust/issues/42460
6474 [42607]: https://github.com/rust-lang/rust/issues/42607
6475 [42740]: https://github.com/rust-lang/rust/pull/42740
6476 [42844]: https://github.com/rust-lang/rust/issues/42844
6477 [42948]: https://github.com/rust-lang/rust/pull/42948
6478 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6479 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6480 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6481 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6482 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6483 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6484 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6485 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6486 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6487 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6488 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6489 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6490 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6491 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6492 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6493 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6494 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6495 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6496 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6497 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6498 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6499 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6502 Version 1.18.0 (2017-06-08)
6503 ===========================
6508 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6509 make the item visible to just that module tree. Also accepts the keyword
6510 `crate` to make something public to the whole crate but not users of the
6511 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6512 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6513 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6514 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6515 types like `Write + Send`, trailing `+` are now supported in trait objects,
6516 and better error reporting for trait objects starting with `?Sized`.
6517 - [0e+10 is now a valid floating point literal][40589]
6518 - [Now warns if you bind a lifetime parameter to 'static][40734]
6519 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6520 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6521 representation in some cases.][40377]
6526 - [rustc can now emit mir with `--emit mir`][39891]
6527 - [Improved LLVM IR for trivial functions][40367]
6528 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6529 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6530 opportunities found through profiling
6531 - [Improved backtrace formatting when panicking][38165]
6536 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6537 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6538 iteration or reallocation.
6539 - [Simplified HashMap Bucket interface][40561] provides performance
6540 improvements for iterating and cloning.
6541 - [Specialize Vec::from_elem to use calloc][40409]
6542 - [Fixed Race condition in fs::create_dir_all][39799]
6543 - [No longer caching stdio on Windows][40516]
6544 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6545 2.50%~ faster and in one case now 12.50% faster.
6546 - [Optimized `AtomicBool::fetch_nand`][41143]
6551 - [`Child::try_wait`]
6552 - [`HashMap::retain`]
6553 - [`HashSet::retain`]
6555 - [`TcpStream::peek`]
6556 - [`UdpSocket::peek`]
6557 - [`UdpSocket::peek_from`]
6562 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6563 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6564 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6565 - [Added Android build support][cargo/3885]
6566 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6567 of a certain type, for example `cargo build --bins` will build all
6569 - [Added support for haiku][cargo/3952]
6574 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6575 - [Rust now uses the official cross compiler for NetBSD][40612]
6576 - [rustdoc now accepts `#` at the start of files][40828]
6577 - [Fixed jemalloc support for musl][41168]
6582 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6583 always placed after the sign if it exists and before the digits. With the `#`
6584 flag the zeroes are placed after the prefix and before the digits.
6585 - [Due to the struct field optimisation][40377], using `transmute` on structs
6586 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6587 always been undefined behavior, but is now more likely to break in practice.
6588 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6589 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6590 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6591 - [Overlapping inherent `impl`s are now a hard error][40728]
6592 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6593 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6594 `out.asm` and `out.ll` instead of only one of the filetypes.
6595 - [ calling a function that returns `Self` will no longer work][41805] when
6596 the size of `Self` cannot be statically determined.
6597 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6598 this has caused a few regressions namely:
6600 - Changed the link order of local static/dynamic libraries (respecting the
6601 order on given rather than having the compiler reorder).
6602 - Changed how MinGW is linked, native code linked to dynamic libraries
6603 may require manually linking to the gcc support library (for the native
6606 [38165]: https://github.com/rust-lang/rust/pull/38165
6607 [39799]: https://github.com/rust-lang/rust/pull/39799
6608 [39891]: https://github.com/rust-lang/rust/pull/39891
6609 [40043]: https://github.com/rust-lang/rust/pull/40043
6610 [40241]: https://github.com/rust-lang/rust/pull/40241
6611 [40338]: https://github.com/rust-lang/rust/pull/40338
6612 [40367]: https://github.com/rust-lang/rust/pull/40367
6613 [40377]: https://github.com/rust-lang/rust/pull/40377
6614 [40409]: https://github.com/rust-lang/rust/pull/40409
6615 [40516]: https://github.com/rust-lang/rust/pull/40516
6616 [40556]: https://github.com/rust-lang/rust/pull/40556
6617 [40561]: https://github.com/rust-lang/rust/pull/40561
6618 [40589]: https://github.com/rust-lang/rust/pull/40589
6619 [40612]: https://github.com/rust-lang/rust/pull/40612
6620 [40723]: https://github.com/rust-lang/rust/pull/40723
6621 [40728]: https://github.com/rust-lang/rust/pull/40728
6622 [40731]: https://github.com/rust-lang/rust/pull/40731
6623 [40734]: https://github.com/rust-lang/rust/pull/40734
6624 [40805]: https://github.com/rust-lang/rust/pull/40805
6625 [40807]: https://github.com/rust-lang/rust/pull/40807
6626 [40828]: https://github.com/rust-lang/rust/pull/40828
6627 [40870]: https://github.com/rust-lang/rust/pull/40870
6628 [41085]: https://github.com/rust-lang/rust/pull/41085
6629 [41143]: https://github.com/rust-lang/rust/pull/41143
6630 [41168]: https://github.com/rust-lang/rust/pull/41168
6631 [41270]: https://github.com/rust-lang/rust/issues/41270
6632 [41469]: https://github.com/rust-lang/rust/pull/41469
6633 [41805]: https://github.com/rust-lang/rust/issues/41805
6634 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6635 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6636 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6637 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6638 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6639 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6640 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6641 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6642 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6643 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6644 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6645 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6646 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6647 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6650 Version 1.17.0 (2017-04-27)
6651 ===========================
6656 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6657 * [Fields of structs may be initialized without duplicating the field/variable
6658 names][39761]. [RFC 1682]
6659 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6660 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6661 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6662 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6663 `'b`. Soundness fix.
6664 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6665 * [Static variables may contain references to other statics][40027]
6670 * [Exit quickly on only `--emit dep-info`][40336]
6671 * [Make `-C relocation-model` more correctly determine whether the linker
6672 creates a position-independent executable][40245]
6673 * [Add `-C overflow-checks` to directly control whether integer overflow
6675 * [The rustc type checker now checks items on demand instead of in a single
6676 in-order pass][40008]. This is mostly an internal refactoring in support of
6677 future work, including incremental type checking, but also resolves [RFC
6678 1647], allowing `Self` to appear in `impl` `where` clauses.
6679 * [Optimize vtable loads][39995]
6680 * [Turn off vectorization for Emscripten targets][39990]
6681 * [Provide suggestions for unknown macros imported with `use`][39953]
6682 * [Fix ICEs in path resolution][39939]
6683 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6684 * [Add clearer error message using `&str + &str`][39116]
6695 * [`Ordering::then`]
6696 * [`Ordering::then_with`]
6697 * [`BTreeMap::range`]
6698 * [`BTreeMap::range_mut`]
6699 * [`collections::Bound`]
6700 * [`process::abort`]
6701 * [`ptr::read_unaligned`]
6702 * [`ptr::write_unaligned`]
6703 * [`Result::expect_err`]
6706 * [`Cell::into_inner`]
6712 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6713 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6714 * [`String` implements `FromIterator<&char>`][40028]
6715 * `Box` [implements][40009] a number of new conversions:
6716 `From<Box<str>> for String`,
6717 `From<Box<[T]>> for Vec<T>`,
6718 `From<Box<CStr>> for CString`,
6719 `From<Box<OsStr>> for OsString`,
6720 `From<Box<Path>> for PathBuf`,
6721 `Into<Box<str>> for String`,
6722 `Into<Box<[T]>> for Vec<T>`,
6723 `Into<Box<CStr>> for CString`,
6724 `Into<Box<OsStr>> for OsString`,
6725 `Into<Box<Path>> for PathBuf`,
6726 `Default for Box<str>`,
6727 `Default for Box<CStr>`,
6728 `Default for Box<OsStr>`,
6729 `From<&CStr> for Box<CStr>`,
6730 `From<&OsStr> for Box<OsStr>`,
6731 `From<&Path> for Box<Path>`
6732 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6733 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6734 * [Slightly optimize `slice::sort`][39538]
6735 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6736 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6737 `Box<str>` implements `From<&str>`][39438]
6738 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6739 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6740 * [`format!` estimates the needed capacity before writing a string][39356]
6741 * [Support unprivileged symlink creation in Windows][38921]
6742 * [`PathBuf` implements `Default`][38764]
6743 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6744 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6745 and poor hash functions.
6750 * [Add `cargo check --all`][cargo/3731]
6751 * [Add an option to ignore SSL revocation checking][cargo/3699]
6752 * [Add `cargo run --package`][cargo/3691]
6753 * [Add `required_features`][cargo/3667]
6754 * [Assume `build.rs` is a build script][cargo/3664]
6755 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6760 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6762 * [The "Unstable Book" documents nightly-only features][ubook]
6763 * [Improve the style of the sidebar in rustdoc output][40265]
6764 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6765 * [Fix MSP430 breakage due to `i128`][40257]
6766 * [Preliminary Solaris/SPARCv9 support][39903]
6767 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6768 run without installing the MSVC runtime.
6769 * [`rustdoc --test` includes file names in test names][39788]
6770 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6771 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6772 * [Initial support for `aarch64-unknown-freebsd`][39491]
6773 * [Initial support for `i686-unknown-netbsd`][39426]
6774 * [This release no longer includes the old makefile build system][39431]. Rust
6775 is built with a custom build system, written in Rust, and with Cargo.
6776 * [Add Debug implementations for libcollection structs][39002]
6777 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6778 * [`--test-threads=0` produces an error][38945]
6779 * [`rustup` installs documentation by default][40526]
6780 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6781 WinDbg and Visual Studio to improve the debugging experience.
6786 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6787 workaround, either use MSVC 2015 or run vcvars.bat.
6788 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6789 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6790 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6792 * [`format!` and `Display::to_string` panic if an underlying formatting
6793 implementation returns an error][40117]. Previously the error was silently
6794 ignored. It is incorrect for `write_fmt` to return an error when writing
6796 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6797 crates were marked stable and could be accessed from the stable toolchain.
6798 * [Rust git source no longer includes vendored crates][39728]. Those that need
6799 to build with vendored crates should build from release tarballs.
6800 * [Fix inert attributes from `proc_macro_derives`][39572]
6801 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6802 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6804 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6805 existing code generally ignores the type of dead-code unless a type-hint is
6806 provided; this can cause surprising inference interactions particularly around
6807 defaulting. The new code uniformly ignores the result type of dead-code.
6808 * [Tuple-struct constructors with private fields are no longer visible][38932]
6809 * [Lifetime parameters that do not appear in the arguments are now considered
6810 early-bound][38897], resolving a soundness bug (#[32330]). The
6811 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6813 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6814 * [Make transmuting from fn item types to pointer-sized types a hard
6817 [27787]: https://github.com/rust-lang/rust/issues/27787
6818 [32330]: https://github.com/rust-lang/rust/issues/32330
6819 [34198]: https://github.com/rust-lang/rust/pull/34198
6820 [38161]: https://github.com/rust-lang/rust/pull/38161
6821 [38368]: https://github.com/rust-lang/rust/pull/38368
6822 [38584]: https://github.com/rust-lang/rust/issues/38584
6823 [38661]: https://github.com/rust-lang/rust/pull/38661
6824 [38764]: https://github.com/rust-lang/rust/pull/38764
6825 [38864]: https://github.com/rust-lang/rust/issues/38864
6826 [38897]: https://github.com/rust-lang/rust/pull/38897
6827 [38921]: https://github.com/rust-lang/rust/pull/38921
6828 [38932]: https://github.com/rust-lang/rust/pull/38932
6829 [38945]: https://github.com/rust-lang/rust/pull/38945
6830 [38981]: https://github.com/rust-lang/rust/pull/38981
6831 [39002]: https://github.com/rust-lang/rust/pull/39002
6832 [39116]: https://github.com/rust-lang/rust/pull/39116
6833 [39193]: https://github.com/rust-lang/rust/pull/39193
6834 [39265]: https://github.com/rust-lang/rust/pull/39265
6835 [39356]: https://github.com/rust-lang/rust/pull/39356
6836 [39372]: https://github.com/rust-lang/rust/pull/39372
6837 [39426]: https://github.com/rust-lang/rust/pull/39426
6838 [39431]: https://github.com/rust-lang/rust/pull/39431
6839 [39438]: https://github.com/rust-lang/rust/pull/39438
6840 [39440]: https://github.com/rust-lang/rust/pull/39440
6841 [39485]: https://github.com/rust-lang/rust/pull/39485
6842 [39491]: https://github.com/rust-lang/rust/pull/39491
6843 [39518]: https://github.com/rust-lang/rust/pull/39518
6844 [39538]: https://github.com/rust-lang/rust/pull/39538
6845 [39572]: https://github.com/rust-lang/rust/pull/39572
6846 [39633]: https://github.com/rust-lang/rust/pull/39633
6847 [39642]: https://github.com/rust-lang/rust/pull/39642
6848 [39728]: https://github.com/rust-lang/rust/pull/39728
6849 [39761]: https://github.com/rust-lang/rust/pull/39761
6850 [39788]: https://github.com/rust-lang/rust/pull/39788
6851 [39793]: https://github.com/rust-lang/rust/pull/39793
6852 [39837]: https://github.com/rust-lang/rust/pull/39837
6853 [39843]: https://github.com/rust-lang/rust/pull/39843
6854 [39851]: https://github.com/rust-lang/rust/pull/39851
6855 [39903]: https://github.com/rust-lang/rust/pull/39903
6856 [39939]: https://github.com/rust-lang/rust/pull/39939
6857 [39953]: https://github.com/rust-lang/rust/pull/39953
6858 [39960]: https://github.com/rust-lang/rust/pull/39960
6859 [39990]: https://github.com/rust-lang/rust/pull/39990
6860 [39995]: https://github.com/rust-lang/rust/pull/39995
6861 [40008]: https://github.com/rust-lang/rust/pull/40008
6862 [40009]: https://github.com/rust-lang/rust/pull/40009
6863 [40027]: https://github.com/rust-lang/rust/pull/40027
6864 [40028]: https://github.com/rust-lang/rust/pull/40028
6865 [40037]: https://github.com/rust-lang/rust/pull/40037
6866 [40117]: https://github.com/rust-lang/rust/pull/40117
6867 [40166]: https://github.com/rust-lang/rust/pull/40166
6868 [40245]: https://github.com/rust-lang/rust/pull/40245
6869 [40257]: https://github.com/rust-lang/rust/pull/40257
6870 [40261]: https://github.com/rust-lang/rust/pull/40261
6871 [40265]: https://github.com/rust-lang/rust/pull/40265
6872 [40319]: https://github.com/rust-lang/rust/pull/40319
6873 [40336]: https://github.com/rust-lang/rust/pull/40336
6874 [40526]: https://github.com/rust-lang/rust/pull/40526
6875 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6876 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6877 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6878 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6879 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6880 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6881 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6882 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6883 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6884 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6885 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6886 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6887 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6888 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6889 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6890 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6891 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6892 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6893 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6894 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6895 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6896 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6897 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6898 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6899 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6900 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6901 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6902 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6903 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6904 [ubook]: https://doc.rust-lang.org/unstable-book/
6907 Version 1.16.0 (2017-03-16)
6908 ===========================
6913 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6914 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6915 match patterns][38069]
6916 * [Clean up semantics of `self` in an import list][38313]
6917 * [`Self` may appear in `impl` headers][38920]
6918 * [`Self` may appear in struct expressions][39282]
6923 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6924 a `.rmeta` file containing only crate metadata][38571]. This can be
6925 used by tools like the Rust Language Service to perform
6926 metadata-only builds.
6927 * [Levenshtein based typo suggestions now work in most places, while
6928 previously they worked only for fields and sometimes for local
6929 variables][38927]. Together with the overhaul of "no
6930 resolution"/"unexpected resolution" errors (#[38154]) they result in
6931 large and systematic improvement in resolution diagnostics.
6932 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6934 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6935 * [`rustc` no longer attempts to provide "consider using an explicit
6936 lifetime" suggestions][37057]. They were inaccurate.
6941 * [`VecDeque::truncate`]
6942 * [`VecDeque::resize`]
6943 * [`String::insert_str`]
6944 * [`Duration::checked_add`]
6945 * [`Duration::checked_sub`]
6946 * [`Duration::checked_div`]
6947 * [`Duration::checked_mul`]
6950 * [`SocketAddr::is_ipv4`]
6951 * [`SocketAddr::is_ipv6`]
6952 * [`IpAddr::is_ipv4`]
6953 * [`IpAddr::is_ipv6`]
6955 * [`Vec::dedup_by_key`]
6956 * [`Result::unwrap_or_default`]
6957 * [`<*const T>::wrapping_offset`]
6958 * [`<*mut T>::wrapping_offset`]
6959 * `CommandExt::creation_flags`
6960 * [`File::set_permissions`]
6961 * [`String::split_off`]
6966 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6967 their argument by `Borrow` parameter][37761]
6968 * [All public types in std implement `Debug`][38006]
6969 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6970 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6971 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6973 * [std: Fix partial writes in `LineWriter`][38062]
6974 * [std: Clamp max read/write sizes on Unix][38622]
6975 * [Use more specific panic message for `&str` slicing errors][38066]
6976 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6977 functionality cannot be achieved in std currently.
6978 * [`writeln!`, like `println!`, now accepts a form with no string
6979 or formatting arguments, to just print a newline][38469]
6980 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6981 * [Reduce the size of static data in `std_unicode::tables`][38781]
6982 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6983 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6985 * [`Duration` implements `Sum`][38712]
6986 * [`String` implements `ToSocketAddrs`][39048]
6991 * [The `cargo check` command does a type check of a project without
6992 building it][cargo/3296]
6993 * [crates.io will display CI badges from Travis and AppVeyor, if
6994 specified in Cargo.toml][cargo/3546]
6995 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6996 * [Compilation profiles accept integer values for `debug`, in addition
6997 to `true` and `false`. These are passed to `rustc` as the value to
6998 `-C debuginfo`][cargo/3534]
6999 * [Implement `cargo --version --verbose`][cargo/3604]
7000 * [All builds now output 'dep-info' build dependencies compatible with
7001 make and ninja][cargo/3557]
7002 * [Build all workspace members with `build --all`][cargo/3511]
7003 * [Document all workspace members with `doc --all`][cargo/3515]
7004 * [Path deps outside workspace are not members][cargo/3443]
7009 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
7010 the path to the Rust implementation][38589]
7011 * [The `armv7-linux-androideabi` target no longer enables NEON
7012 extensions, per Google's ABI guide][38413]
7013 * [The stock standard library can be compiled for Redox OS][38401]
7014 * [Rust has initial SPARC support][38726]. Tier 3. No builds
7016 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
7018 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
7023 * [Uninhabitable enums (those without any variants) no longer permit wildcard
7024 match patterns][38069]
7025 * In this release, references to uninhabited types can not be
7026 pattern-matched. This was accidentally allowed in 1.15.
7027 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
7028 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
7030 * [Clean up semantics of `self` in an import list][38313]
7031 * Reimplemented lifetime elision. This change was almost entirely compatible
7032 with existing code, but it did close a number of small bugs and loopholes,
7033 as well as being more accepting in some other [cases][41105].
7035 [37057]: https://github.com/rust-lang/rust/pull/37057
7036 [37761]: https://github.com/rust-lang/rust/pull/37761
7037 [38006]: https://github.com/rust-lang/rust/pull/38006
7038 [38051]: https://github.com/rust-lang/rust/pull/38051
7039 [38062]: https://github.com/rust-lang/rust/pull/38062
7040 [38622]: https://github.com/rust-lang/rust/pull/38622
7041 [38066]: https://github.com/rust-lang/rust/pull/38066
7042 [38069]: https://github.com/rust-lang/rust/pull/38069
7043 [38131]: https://github.com/rust-lang/rust/pull/38131
7044 [38154]: https://github.com/rust-lang/rust/pull/38154
7045 [38274]: https://github.com/rust-lang/rust/pull/38274
7046 [38304]: https://github.com/rust-lang/rust/pull/38304
7047 [38313]: https://github.com/rust-lang/rust/pull/38313
7048 [38327]: https://github.com/rust-lang/rust/pull/38327
7049 [38401]: https://github.com/rust-lang/rust/pull/38401
7050 [38413]: https://github.com/rust-lang/rust/pull/38413
7051 [38469]: https://github.com/rust-lang/rust/pull/38469
7052 [38559]: https://github.com/rust-lang/rust/pull/38559
7053 [38571]: https://github.com/rust-lang/rust/pull/38571
7054 [38580]: https://github.com/rust-lang/rust/pull/38580
7055 [38589]: https://github.com/rust-lang/rust/pull/38589
7056 [38670]: https://github.com/rust-lang/rust/pull/38670
7057 [38712]: https://github.com/rust-lang/rust/pull/38712
7058 [38726]: https://github.com/rust-lang/rust/pull/38726
7059 [38781]: https://github.com/rust-lang/rust/pull/38781
7060 [38798]: https://github.com/rust-lang/rust/pull/38798
7061 [38909]: https://github.com/rust-lang/rust/pull/38909
7062 [38920]: https://github.com/rust-lang/rust/pull/38920
7063 [38927]: https://github.com/rust-lang/rust/pull/38927
7064 [39048]: https://github.com/rust-lang/rust/pull/39048
7065 [39282]: https://github.com/rust-lang/rust/pull/39282
7066 [39379]: https://github.com/rust-lang/rust/pull/39379
7067 [41105]: https://github.com/rust-lang/rust/issues/41105
7068 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7069 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
7070 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
7071 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
7072 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
7073 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
7074 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
7075 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
7076 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
7077 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
7078 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
7079 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
7080 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
7081 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
7082 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
7083 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
7084 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
7085 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
7086 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
7087 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
7088 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
7089 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
7090 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
7091 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
7092 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
7093 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
7094 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
7095 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
7096 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
7099 Version 1.15.1 (2017-02-09)
7100 ===========================
7102 * [Fix IntoIter::as_mut_slice's signature][39466]
7103 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
7105 [39466]: https://github.com/rust-lang/rust/pull/39466
7106 [39523]: https://github.com/rust-lang/rust/pull/39523
7109 Version 1.15.0 (2017-02-02)
7110 ===========================
7115 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
7116 stable. This allows popular code-generating crates like Serde and Diesel to
7117 work ergonomically. [RFC 1681].
7118 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
7119 with curly braces][36868]. Part of [RFC 1506].
7120 * [A number of minor changes to name resolution have been activated][37127].
7121 They add up to more consistent semantics, allowing for future evolution of
7122 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7123 details of what is different. The breaking changes here have been transitioned
7124 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7125 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
7127 * [`?Sized` can be used in `where` clauses][37791]
7128 * [There is now a limit on the size of monomorphized types and it can be
7129 modified with the `#![type_size_limit]` crate attribute, similarly to
7130 the `#![recursion_limit]` attribute][37789]
7135 * [On Windows, the compiler will apply dllimport attributes when linking to
7136 extern functions][37973]. Additional attributes and flags can control which
7137 library kind is linked and its name. [RFC 1717].
7138 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7139 * [The `--test` flag works with procedural macro crates][38107]
7140 * [Fix `extern "aapcs" fn` ABI][37814]
7141 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
7142 * [The `format!` expander recognizes incorrect `printf` and shell-style
7143 formatting directives and suggests the correct format][37613].
7144 * [Only report one error for all unused imports in an import list][37456]
7146 Compiler Performance
7147 --------------------
7149 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
7150 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
7151 * [Don't clone in `UnificationTable::probe`][37848]
7152 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
7153 * [Use small vectors in type walker][37760]
7154 * [Macro expansion performance was improved][37701]
7155 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
7156 * [Replace FNV with a faster hash function][37229]
7161 * [`std::iter::Iterator::min_by`]
7162 * [`std::iter::Iterator::max_by`]
7163 * [`std::os::*::fs::FileExt`]
7164 * [`std::sync::atomic::Atomic*::get_mut`]
7165 * [`std::sync::atomic::Atomic*::into_inner`]
7166 * [`std::vec::IntoIter::as_slice`]
7167 * [`std::vec::IntoIter::as_mut_slice`]
7168 * [`std::sync::mpsc::Receiver::try_iter`]
7169 * [`std::os::unix::process::CommandExt::before_exec`]
7170 * [`std::rc::Rc::strong_count`]
7171 * [`std::rc::Rc::weak_count`]
7172 * [`std::sync::Arc::strong_count`]
7173 * [`std::sync::Arc::weak_count`]
7174 * [`std::char::encode_utf8`]
7175 * [`std::char::encode_utf16`]
7176 * [`std::cell::Ref::clone`]
7177 * [`std::io::Take::into_inner`]
7182 * [The standard sorting algorithm has been rewritten for dramatic performance
7183 improvements][38192]. It is a hybrid merge sort, drawing influences from
7184 Timsort. Previously it was a naive merge sort.
7185 * [`Iterator::nth` no longer has a `Sized` bound][38134]
7186 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
7188 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7189 and `char_indices().last()`][37882]
7190 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7191 * [Chinese characters display correctly in `fmt::Debug`][37855]
7192 * [Derive `Default` for `Duration`][37699]
7193 * [Support creation of anonymous pipes on WinXP/2k][37677]
7194 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7195 * [Don't pass overlapped handles to processes][38835]
7200 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7201 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7202 should instead check the variable at runtime with `std::env`. That the value
7203 was set at build time was a bug, and incorrect when cross-compiling. This
7204 change is known to cause breakage.
7205 * [Add `--all` flag to `cargo test`][cargo/3221]
7206 * [Compile statically against the MSVC CRT][cargo/3363]
7207 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7208 * [Link OpenSSL statically on OSX][cargo/3311]
7209 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7210 * [Test for bad path overrides with summaries][cargo/3336]
7211 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7212 * [Fix retrying crate downloads for network errors][cargo/3348]
7213 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7214 * [Emit more info on --message-format=json][cargo/3319]
7215 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7216 * [Don't ignore errors in workspace manifest][cargo/3409]
7217 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7222 * [Test runners (binaries built with `--test`) now support a `--list` argument
7223 that lists the tests it contains][38185]
7224 * [Test runners now support a `--exact` argument that makes the test filter
7225 match exactly, instead of matching only a substring of the test name][38181]
7226 * [rustdoc supports a `--playground-url` flag][37763]
7227 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7232 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7233 continue to be used in this release by passing `--disable-rustbuild` to the
7234 configure script, but they will be deleted soon. Note that the new build
7235 system uses a different on-disk layout that will likely affect any scripts
7237 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7239 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7240 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7246 * [A number of minor changes to name resolution have been activated][37127].
7247 They add up to more consistent semantics, allowing for future evolution of
7248 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7249 details of what is different. The breaking changes here have been transitioned
7250 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7251 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7252 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7253 should instead check the variable at runtime with `std::env`. That the value
7254 was set at build time was a bug, and incorrect when cross-compiling. This
7255 change is known to cause breakage.
7256 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7257 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7258 1.10 and is now an error by default. It will become a hard error in the near
7260 * [The semantics relating modules to file system directories are changing in
7261 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7262 lint, which is a warning in this release, and will become a hard error in the
7264 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7265 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7266 the underlying iterator][37834]
7268 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7269 [33685]: https://github.com/rust-lang/rust/issues/33685
7270 [36868]: https://github.com/rust-lang/rust/pull/36868
7271 [37127]: https://github.com/rust-lang/rust/pull/37127
7272 [37229]: https://github.com/rust-lang/rust/pull/37229
7273 [37456]: https://github.com/rust-lang/rust/pull/37456
7274 [37527]: https://github.com/rust-lang/rust/pull/37527
7275 [37602]: https://github.com/rust-lang/rust/pull/37602
7276 [37613]: https://github.com/rust-lang/rust/pull/37613
7277 [37615]: https://github.com/rust-lang/rust/pull/37615
7278 [37636]: https://github.com/rust-lang/rust/pull/37636
7279 [37627]: https://github.com/rust-lang/rust/pull/37627
7280 [37642]: https://github.com/rust-lang/rust/pull/37642
7281 [37677]: https://github.com/rust-lang/rust/pull/37677
7282 [37699]: https://github.com/rust-lang/rust/pull/37699
7283 [37701]: https://github.com/rust-lang/rust/pull/37701
7284 [37705]: https://github.com/rust-lang/rust/pull/37705
7285 [37749]: https://github.com/rust-lang/rust/pull/37749
7286 [37760]: https://github.com/rust-lang/rust/pull/37760
7287 [37763]: https://github.com/rust-lang/rust/pull/37763
7288 [37764]: https://github.com/rust-lang/rust/pull/37764
7289 [37789]: https://github.com/rust-lang/rust/pull/37789
7290 [37791]: https://github.com/rust-lang/rust/pull/37791
7291 [37814]: https://github.com/rust-lang/rust/pull/37814
7292 [37817]: https://github.com/rust-lang/rust/pull/37817
7293 [37834]: https://github.com/rust-lang/rust/pull/37834
7294 [37848]: https://github.com/rust-lang/rust/pull/37848
7295 [37855]: https://github.com/rust-lang/rust/pull/37855
7296 [37882]: https://github.com/rust-lang/rust/pull/37882
7297 [37888]: https://github.com/rust-lang/rust/pull/37888
7298 [37973]: https://github.com/rust-lang/rust/pull/37973
7299 [37979]: https://github.com/rust-lang/rust/pull/37979
7300 [38086]: https://github.com/rust-lang/rust/pull/38086
7301 [38107]: https://github.com/rust-lang/rust/pull/38107
7302 [38117]: https://github.com/rust-lang/rust/pull/38117
7303 [38134]: https://github.com/rust-lang/rust/pull/38134
7304 [38146]: https://github.com/rust-lang/rust/pull/38146
7305 [38181]: https://github.com/rust-lang/rust/pull/38181
7306 [38182]: https://github.com/rust-lang/rust/pull/38182
7307 [38185]: https://github.com/rust-lang/rust/pull/38185
7308 [38192]: https://github.com/rust-lang/rust/pull/38192
7309 [38279]: https://github.com/rust-lang/rust/pull/38279
7310 [38835]: https://github.com/rust-lang/rust/pull/38835
7311 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7312 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7313 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7314 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7315 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7316 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7317 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7318 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7319 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7320 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7321 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7322 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7323 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7324 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7325 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7326 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7327 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7328 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7329 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7330 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7331 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7332 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7333 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7334 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7335 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7336 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7337 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7338 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7339 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7340 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7341 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7342 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7343 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7344 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7345 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7346 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7347 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7350 Version 1.14.0 (2016-12-22)
7351 ===========================
7356 * [`..` matches multiple tuple fields in enum variants, structs
7357 and tuples][36843]. [RFC 1492].
7358 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7359 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7360 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7361 dereferencing][36822]
7366 * [Mark enums with non-zero discriminant as non-zero][37224]
7367 * [Lower-case `static mut` names are linted like other
7368 statics and consts][37162]
7369 * [Fix ICE on some macros in const integer positions
7370 (e.g. `[u8; m!()]`)][36819]
7371 * [Improve error message and snippet for "did you mean `x`"][36798]
7372 * [Add a panic-strategy field to the target specification][36794]
7373 * [Include LLVM version in `--version --verbose`][37200]
7375 Compile-time Optimizations
7376 --------------------------
7378 * [Improve macro expansion performance][37569]
7379 * [Shrink `Expr_::ExprInlineAsm`][37445]
7380 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7381 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7382 * [Avoid more allocations when compiling html5ever][37373]
7383 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7384 * [Avoid some allocations in the macro parser][37318]
7385 * [Use a faster deflate setting][37298]
7386 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7387 during interning of slices][37270]
7388 * [Optimize `write_metadata`][37267]
7389 * [Don't process obligation forest cycles when stalled][37231]
7390 * [Avoid many `CrateConfig` clones][37161]
7391 * [Optimize `Substs::super_fold_with`][37108]
7392 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7393 * [Speed up `plug_leaks`][36917]
7398 * [`println!()`, with no arguments, prints newline][36825].
7399 Previously, an empty string was required to achieve the same.
7400 * [`Wrapping` impls standard binary and unary operators, as well as
7401 the `Sum` and `Product` iterators][37356]
7402 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7404 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7405 `VecDeque` iterators][37315]
7406 * [Improve `SipHasher` performance on small values][37312]
7407 * [Add Iterator trait TrustedLen to enable better FromIterator /
7409 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7410 * [`ReadDir` implements `Debug`][37221]
7411 * [Implement `RefUnwindSafe` for atomic types][37178]
7412 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7413 * [Avoid allocations in `Decoder::read_str`][37064]
7414 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7415 * [Impl `Debug` for raw pointers to unsized data][36880]
7416 * [Don't reuse `HashMap` random seeds][37470]
7417 * [The internal memory layout of `HashMap` is more cache-friendly, for
7418 significant improvements in some operations][36692]
7419 * [`HashMap` uses less memory on 32-bit architectures][36595]
7420 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7425 * [Expose rustc cfg values to build scripts][cargo/3243]
7426 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7427 * [Fix passing --features when testing multiple packages][cargo/3280]
7428 * [Use a single profile set per workspace][cargo/3249]
7429 * [Load `replace` sections from lock files][cargo/3220]
7430 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7435 * [rustup is the recommended Rust installation method][1.14rustup]
7436 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7437 S390x. These are [tier 2] platforms and may have major defects. Follow the
7438 instructions on the website to install, or add the targets to an existing
7439 installation with `rustup target add`. The new target triples are:
7440 - `mips-unknown-linux-gnu`
7441 - `mipsel-unknown-linux-gnu`
7442 - `mips64-unknown-linux-gnuabi64`
7443 - `mips64el-unknown-linux-gnuabi64 `
7444 - `powerpc-unknown-linux-gnu`
7445 - `powerpc64-unknown-linux-gnu`
7446 - `powerpc64le-unknown-linux-gnu`
7447 - `s390x-unknown-linux-gnu `
7448 * This release includes target (std) builds for ARM Linux running MUSL
7449 libc. These are [tier 2] platforms and may have major defects. Add the
7450 following triples to an existing rustup installation with `rustup target add`:
7451 - `arm-unknown-linux-musleabi`
7452 - `arm-unknown-linux-musleabihf`
7453 - `armv7-unknown-linux-musleabihf`
7454 * This release includes [experimental support for WebAssembly][1.14wasm], via
7455 the `wasm32-unknown-emscripten` target. This target is known to have major
7456 defects. Please test, report, and fix.
7457 * rustup no longer installs documentation by default. Run `rustup
7458 component add rust-docs` to install.
7459 * [Fix line stepping in debugger][37310]
7460 * [Enable line number debuginfo in releases][37280]
7465 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7466 * [Add support for Fuchsia OS][37313]
7467 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7472 * [A number of forward-compatibility lints used by the compiler
7473 to gradually introduce language changes have been converted
7474 to deny by default][36894]:
7475 - ["use of inaccessible extern crate erroneously allowed"][36886]
7476 - ["type parameter default erroneously allowed in invalid location"][36887]
7477 - ["detects super or self keywords at the beginning of global path"][36888]
7478 - ["two overlapping inherent impls define an item with the same name
7479 were erroneously allowed"][36889]
7480 - ["floating-point constants cannot be used in patterns"][36890]
7481 - ["constants of struct or enum type can only be used in a pattern if
7482 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7483 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7484 * [Prohibit patterns in trait methods without bodies][37378]
7485 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7486 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7487 * [The `$crate` macro variable is accepted in fewer locations][37213]
7488 * [Impls specifying extra region requirements beyond the trait
7489 they implement are rejected][37167]
7490 * [Enums may not be unsized][37111]. Unsized enums are intended to
7491 work but never have. For now they are forbidden.
7492 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7494 [tier 2]: https://forge.rust-lang.org/platform-support.html
7495 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7496 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7497 [36430]: https://github.com/rust-lang/rust/pull/36430
7498 [36595]: https://github.com/rust-lang/rust/pull/36595
7499 [36692]: https://github.com/rust-lang/rust/pull/36692
7500 [36767]: https://github.com/rust-lang/rust/pull/36767
7501 [36794]: https://github.com/rust-lang/rust/pull/36794
7502 [36798]: https://github.com/rust-lang/rust/pull/36798
7503 [36819]: https://github.com/rust-lang/rust/pull/36819
7504 [36822]: https://github.com/rust-lang/rust/pull/36822
7505 [36825]: https://github.com/rust-lang/rust/pull/36825
7506 [36843]: https://github.com/rust-lang/rust/pull/36843
7507 [36880]: https://github.com/rust-lang/rust/pull/36880
7508 [36886]: https://github.com/rust-lang/rust/issues/36886
7509 [36887]: https://github.com/rust-lang/rust/issues/36887
7510 [36888]: https://github.com/rust-lang/rust/issues/36888
7511 [36889]: https://github.com/rust-lang/rust/issues/36889
7512 [36890]: https://github.com/rust-lang/rust/issues/36890
7513 [36891]: https://github.com/rust-lang/rust/issues/36891
7514 [36892]: https://github.com/rust-lang/rust/issues/36892
7515 [36894]: https://github.com/rust-lang/rust/pull/36894
7516 [36917]: https://github.com/rust-lang/rust/pull/36917
7517 [36993]: https://github.com/rust-lang/rust/pull/36993
7518 [37037]: https://github.com/rust-lang/rust/pull/37037
7519 [37064]: https://github.com/rust-lang/rust/pull/37064
7520 [37094]: https://github.com/rust-lang/rust/pull/37094
7521 [37108]: https://github.com/rust-lang/rust/pull/37108
7522 [37111]: https://github.com/rust-lang/rust/pull/37111
7523 [37161]: https://github.com/rust-lang/rust/pull/37161
7524 [37162]: https://github.com/rust-lang/rust/pull/37162
7525 [37167]: https://github.com/rust-lang/rust/pull/37167
7526 [37178]: https://github.com/rust-lang/rust/pull/37178
7527 [37200]: https://github.com/rust-lang/rust/pull/37200
7528 [37213]: https://github.com/rust-lang/rust/pull/37213
7529 [37221]: https://github.com/rust-lang/rust/pull/37221
7530 [37224]: https://github.com/rust-lang/rust/pull/37224
7531 [37230]: https://github.com/rust-lang/rust/pull/37230
7532 [37231]: https://github.com/rust-lang/rust/pull/37231
7533 [37247]: https://github.com/rust-lang/rust/pull/37247
7534 [37267]: https://github.com/rust-lang/rust/pull/37267
7535 [37270]: https://github.com/rust-lang/rust/pull/37270
7536 [37273]: https://github.com/rust-lang/rust/pull/37273
7537 [37280]: https://github.com/rust-lang/rust/pull/37280
7538 [37298]: https://github.com/rust-lang/rust/pull/37298
7539 [37306]: https://github.com/rust-lang/rust/pull/37306
7540 [37310]: https://github.com/rust-lang/rust/pull/37310
7541 [37312]: https://github.com/rust-lang/rust/pull/37312
7542 [37313]: https://github.com/rust-lang/rust/pull/37313
7543 [37315]: https://github.com/rust-lang/rust/pull/37315
7544 [37318]: https://github.com/rust-lang/rust/pull/37318
7545 [37322]: https://github.com/rust-lang/rust/pull/37322
7546 [37326]: https://github.com/rust-lang/rust/pull/37326
7547 [37351]: https://github.com/rust-lang/rust/pull/37351
7548 [37356]: https://github.com/rust-lang/rust/pull/37356
7549 [37367]: https://github.com/rust-lang/rust/pull/37367
7550 [37373]: https://github.com/rust-lang/rust/pull/37373
7551 [37378]: https://github.com/rust-lang/rust/pull/37378
7552 [37389]: https://github.com/rust-lang/rust/pull/37389
7553 [37392]: https://github.com/rust-lang/rust/pull/37392
7554 [37427]: https://github.com/rust-lang/rust/pull/37427
7555 [37439]: https://github.com/rust-lang/rust/pull/37439
7556 [37445]: https://github.com/rust-lang/rust/pull/37445
7557 [37470]: https://github.com/rust-lang/rust/pull/37470
7558 [37569]: https://github.com/rust-lang/rust/pull/37569
7559 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7560 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7561 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7562 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7563 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7564 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7565 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7568 Version 1.13.0 (2016-11-10)
7569 ===========================
7574 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7575 errors, like the `try!` macro, described in [RFC 0243].
7576 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7577 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7578 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7579 * [Fix lifetime rules for 'if' conditions][36029]
7580 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7585 * [Add the `-C link-arg` argument][36574]
7586 * [Remove the old AST-based backend from rustc_trans][35764]
7587 * [Don't enable NEON by default on armv7 Linux][35814]
7588 * [Fix debug line number info for macro expansions][35238]
7589 * [Do not emit "class method" debuginfo for types that are not
7590 DICompositeType][36008]
7591 * [Warn about multiple conflicting #[repr] hints][34623]
7592 * [When sizing DST, don't double-count nested struct prefixes][36351]
7593 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7594 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7595 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7596 * [Expand macros without recursing to avoid stack overflows][36214]
7601 * [Replace macro backtraces with labeled local uses][35702]
7602 * [Improve error message for misplaced doc comments][33922]
7603 * [Buffer unix and lock windows to prevent message interleaving][35975]
7604 * [Update lifetime errors to specifically note temporaries][36171]
7605 * [Special case a few colors for Windows][36178]
7606 * [Suggest `use self` when such an import resolves][36289]
7607 * [Be more specific when type parameter shadows primitive type][36338]
7608 * Many minor improvements
7610 Compile-time Optimizations
7611 --------------------------
7613 * [Compute and cache HIR hashes at beginning][35854]
7614 * [Don't hash types in loan paths][36004]
7615 * [Cache projections in trans][35761]
7616 * [Optimize the parser's last token handling][36527]
7617 * [Only instantiate #[inline] functions in codegen units referencing
7618 them][36524]. This leads to big improvements in cases where crates export
7619 define many inline functions without using them directly.
7620 * [Lazily allocate TypedArena's first chunk][36592]
7621 * [Don't allocate during default HashSet creation][36734]
7628 * [`overflowing_abs`]
7629 * [`RefCell::try_borrow`]
7630 * [`RefCell::try_borrow_mut`]
7635 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7636 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7638 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7639 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7640 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7641 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7642 * [Use arc4rand on FreeBSD][35884]
7643 * [memrchr: Correct aligned offset computation][35969]
7644 * [Improve Demangling of Rust Symbols][36059]
7645 * [Use monotonic time in condition variables][35048]
7646 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7647 * [Implement conversion traits for `char`][35755]
7648 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7649 * [Zero first byte of CString on drop][36264]
7650 * [Inherit overflow checks for sum and product][36372]
7651 * [Add missing Eq implementations][36423]
7652 * [Implement `Debug` for `DirEntry`][36631]
7653 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7655 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7656 * [Implement more traits for `std::io::ErrorKind`][35911]
7657 * [Optimize BinaryHeap bounds checking][36072]
7658 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7659 `extend_with_element`][36355]
7660 * [Fix overflow checking in unsigned pow()][34942]
7665 * This release includes security fixes to both curl and OpenSSL.
7666 * [Fix transitive doctests when panic=abort][cargo/3021]
7667 * [Add --all-features flag to cargo][cargo/3038]
7668 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7669 * [Don't parse the home directory more than once][cargo/3078]
7670 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7671 * [Update OpenSSL to 1.0.2j][cargo/3121]
7672 * [Add license and license_file to cargo metadata output][cargo/3110]
7673 * [Make crates-io registry URL optional in config; ignore all changes to
7674 source.crates-io][cargo/3089]
7675 * [Don't download dependencies from other platforms][cargo/3123]
7676 * [Build transitive dev-dependencies when needed][cargo/3125]
7677 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7678 * [Avoid updating registry when adding existing deps][cargo/3144]
7679 * [Warn about path overrides that won't work][cargo/3136]
7680 * [Use workspaces during `cargo install`][cargo/3146]
7681 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7682 * [Add --message-format flag][cargo/3000]
7683 * [Pass target environment for rustdoc][cargo/3205]
7684 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7685 * [Update curl and curl-sys][cargo/3241]
7686 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7691 * [rustdoc: Add the `--sysroot` argument][36586]
7692 * [rustdoc: Fix a couple of issues with the search results][35655]
7693 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7694 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7695 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7700 * [Remove unmaintained style guide][35124]
7701 * [Add s390x support][36369]
7702 * [Initial work at Haiku OS support][36727]
7703 * [Add mips-uclibc targets][35734]
7704 * [Crate-ify compiler-rt into compiler-builtins][35021]
7705 * [Add rustc version info (git hash + date) to dist tarball][36213]
7706 * Many documentation improvements
7711 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7712 * [Deny (by default) transmuting from fn item types to pointer-sized
7713 types][34923]. Continuing the long transition to zero-sized fn items,
7715 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7717 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7718 * [Fix lifetime rules for 'if' conditions][36029].
7719 * [Inherit overflow checks for sum and product][36372].
7720 * [Forbid user-defined macros named "macro_rules"][36730].
7722 [33922]: https://github.com/rust-lang/rust/pull/33922
7723 [34623]: https://github.com/rust-lang/rust/pull/34623
7724 [34923]: https://github.com/rust-lang/rust/pull/34923
7725 [34942]: https://github.com/rust-lang/rust/pull/34942
7726 [35021]: https://github.com/rust-lang/rust/pull/35021
7727 [35048]: https://github.com/rust-lang/rust/pull/35048
7728 [35074]: https://github.com/rust-lang/rust/pull/35074
7729 [35124]: https://github.com/rust-lang/rust/pull/35124
7730 [35234]: https://github.com/rust-lang/rust/pull/35234
7731 [35238]: https://github.com/rust-lang/rust/pull/35238
7732 [35354]: https://github.com/rust-lang/rust/pull/35354
7733 [35559]: https://github.com/rust-lang/rust/pull/35559
7734 [35585]: https://github.com/rust-lang/rust/pull/35585
7735 [35627]: https://github.com/rust-lang/rust/pull/35627
7736 [35655]: https://github.com/rust-lang/rust/pull/35655
7737 [35702]: https://github.com/rust-lang/rust/pull/35702
7738 [35707]: https://github.com/rust-lang/rust/pull/35707
7739 [35728]: https://github.com/rust-lang/rust/pull/35728
7740 [35734]: https://github.com/rust-lang/rust/pull/35734
7741 [35755]: https://github.com/rust-lang/rust/pull/35755
7742 [35761]: https://github.com/rust-lang/rust/pull/35761
7743 [35764]: https://github.com/rust-lang/rust/pull/35764
7744 [35814]: https://github.com/rust-lang/rust/pull/35814
7745 [35854]: https://github.com/rust-lang/rust/pull/35854
7746 [35871]: https://github.com/rust-lang/rust/pull/35871
7747 [35884]: https://github.com/rust-lang/rust/pull/35884
7748 [35911]: https://github.com/rust-lang/rust/pull/35911
7749 [35969]: https://github.com/rust-lang/rust/pull/35969
7750 [35975]: https://github.com/rust-lang/rust/pull/35975
7751 [36004]: https://github.com/rust-lang/rust/pull/36004
7752 [36008]: https://github.com/rust-lang/rust/pull/36008
7753 [36014]: https://github.com/rust-lang/rust/pull/36014
7754 [36029]: https://github.com/rust-lang/rust/pull/36029
7755 [36059]: https://github.com/rust-lang/rust/pull/36059
7756 [36072]: https://github.com/rust-lang/rust/pull/36072
7757 [36101]: https://github.com/rust-lang/rust/pull/36101
7758 [36104]: https://github.com/rust-lang/rust/pull/36104
7759 [36171]: https://github.com/rust-lang/rust/pull/36171
7760 [36173]: https://github.com/rust-lang/rust/pull/36173
7761 [36178]: https://github.com/rust-lang/rust/pull/36178
7762 [36213]: https://github.com/rust-lang/rust/pull/36213
7763 [36214]: https://github.com/rust-lang/rust/pull/36214
7764 [36264]: https://github.com/rust-lang/rust/pull/36264
7765 [36266]: https://github.com/rust-lang/rust/pull/36266
7766 [36289]: https://github.com/rust-lang/rust/pull/36289
7767 [36338]: https://github.com/rust-lang/rust/pull/36338
7768 [36351]: https://github.com/rust-lang/rust/pull/36351
7769 [36355]: https://github.com/rust-lang/rust/pull/36355
7770 [36369]: https://github.com/rust-lang/rust/pull/36369
7771 [36372]: https://github.com/rust-lang/rust/pull/36372
7772 [36423]: https://github.com/rust-lang/rust/pull/36423
7773 [36482]: https://github.com/rust-lang/rust/pull/36482
7774 [36505]: https://github.com/rust-lang/rust/pull/36505
7775 [36524]: https://github.com/rust-lang/rust/pull/36524
7776 [36527]: https://github.com/rust-lang/rust/pull/36527
7777 [36551]: https://github.com/rust-lang/rust/pull/36551
7778 [36574]: https://github.com/rust-lang/rust/pull/36574
7779 [36586]: https://github.com/rust-lang/rust/pull/36586
7780 [36592]: https://github.com/rust-lang/rust/pull/36592
7781 [36631]: https://github.com/rust-lang/rust/pull/36631
7782 [36721]: https://github.com/rust-lang/rust/pull/36721
7783 [36727]: https://github.com/rust-lang/rust/pull/36727
7784 [36730]: https://github.com/rust-lang/rust/pull/36730
7785 [36734]: https://github.com/rust-lang/rust/pull/36734
7786 [36754]: https://github.com/rust-lang/rust/pull/36754
7787 [36995]: https://github.com/rust-lang/rust/pull/36995
7788 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7789 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7790 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7791 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7792 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7793 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7794 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7795 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7796 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7797 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7798 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7799 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7800 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7801 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7802 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7803 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7804 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7805 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7806 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7807 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7808 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7809 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7810 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7811 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7812 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7813 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7814 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7815 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7816 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7817 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7818 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7819 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7822 Version 1.12.1 (2016-10-20)
7823 ===========================
7828 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7829 * [Confusion with double negation and booleans][36856]
7830 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7831 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7832 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7833 * [Corrupted memory after updated to 1.12][36936]
7834 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7835 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7836 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7838 [36381]: https://github.com/rust-lang/rust/issues/36381
7839 [36856]: https://github.com/rust-lang/rust/issues/36856
7840 [36875]: https://github.com/rust-lang/rust/issues/36875
7841 [36924]: https://github.com/rust-lang/rust/issues/36924
7842 [36926]: https://github.com/rust-lang/rust/issues/36926
7843 [36936]: https://github.com/rust-lang/rust/issues/36936
7844 [37026]: https://github.com/rust-lang/rust/issues/37026
7845 [37112]: https://github.com/rust-lang/rust/issues/37112
7846 [37153]: https://github.com/rust-lang/rust/issues/37153
7849 Version 1.12.0 (2016-09-29)
7850 ===========================
7855 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7856 This translation pass is far simpler than the previous AST->LLVM pass, and
7857 creates opportunities to perform new optimizations directly on the MIR. It
7858 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7859 * [`rustc` presents a new, more readable error format, along with
7860 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7861 Most common editors supporting Rust have been updated to work with it. It was
7862 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7867 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7868 This translation pass is far simpler than the previous AST->LLVM pass, and
7869 creates opportunities to perform new optimizations directly on the MIR. It
7870 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7871 * [Print the Rust target name, not the LLVM target name, with
7872 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7873 * [The computation of `TypeId` is correct in some cases where it was previously
7874 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7875 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7876 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7877 `--print relocation-models`, and `--print code-models` print the available
7878 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7879 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7880 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7881 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7882 These targets produce statically-linked binaries. There are no binary release
7888 * [`rustc` presents a new, more readable error format, along with
7889 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7890 Most common editors supporting Rust have been updated to work with it. It was
7891 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7892 * [In error descriptions, references are now described in plain English,
7893 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7894 * [In error type descriptions, unknown numeric types are named `{integer}` or
7895 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7896 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7901 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7902 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7903 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7904 useful](https://github.com/rust-lang/rust/pull/34908)
7905 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7906 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7907 * [Semicolons are properly required as statement delimiters inside
7908 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7909 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7914 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7915 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7916 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7917 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7918 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7919 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7920 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7921 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7922 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7923 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7924 Both on Unix and Windows.
7925 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7926 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7927 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7928 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7929 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7930 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7931 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7932 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7937 * [The `format!` macro and friends now allow a single argument to be formatted
7938 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7939 * [The lifetime bounds on `[T]::binary_search_by` and
7940 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7941 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7942 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7943 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7944 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7945 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7946 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7947 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7948 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7949 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7950 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7951 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7952 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7953 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7954 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7955 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7956 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7957 * [`mpsc::sync_channel` `Receiver`s return any available message before
7958 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7959 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7960 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7965 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7966 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7967 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7968 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7969 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7970 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7971 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7972 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7973 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7974 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7975 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7976 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7977 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7978 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7979 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7980 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7985 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7986 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7991 * [Test binaries now support a `--test-threads` argument to specify the number
7992 of threads used to run tests, and which acts the same as the
7993 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7994 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7995 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7996 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7997 * [Rust releases now come with source packages that can be installed by rustup
7998 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7999 The resulting source code can be used by tools and IDES, located in the
8000 sysroot under `lib/rustlib/src`.
8005 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
8006 * Many minor improvements to the documentation.
8007 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
8012 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
8013 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
8014 * [When formatting strings, if "precision" is specified, the "fill",
8015 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
8016 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
8019 Version 1.11.0 (2016-08-18)
8020 ===========================
8025 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
8026 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
8027 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
8028 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
8033 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
8034 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
8035 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
8036 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
8037 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
8038 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
8039 (in libcore - previously stabilized in libstd)
8040 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
8041 (in libcore - previously stabilized in libstd)
8042 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
8043 (in libcore - previously stabilized in libstd)
8044 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
8045 (in libcore - previously stabilized in libstd)
8046 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8047 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
8048 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
8049 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
8054 * [The `thread_local!` macro supports multiple definitions in a single
8055 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
8056 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
8057 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
8058 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
8059 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
8060 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
8061 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
8062 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
8067 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
8068 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
8069 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
8070 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
8071 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
8072 and `-vv` prints warnings for all crates.
8073 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
8074 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
8075 This provides room for expansion by arbitrary tools.
8076 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
8077 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
8078 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
8079 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
8080 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
8081 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
8082 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
8087 * [Caching projections speeds up type check dramatically for some
8088 workloads](https://github.com/rust-lang/rust/pull/33816)
8089 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
8090 This hasher is faster, but is believed to provide sufficient
8091 protection from collision attacks.
8092 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
8097 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
8098 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
8099 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
8100 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
8101 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
8106 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
8107 * [When emitting debug info, rustc emits frame pointers for closures,
8108 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
8109 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
8110 * Many more errors have been given error codes and extended
8112 * API documentation continues to be improved, with many new examples
8117 * [rustc no longer hangs when dependencies recursively re-export
8118 submodules](https://github.com/rust-lang/rust/pull/34542)
8119 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
8120 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
8121 rewritten](https://github.com/rust-lang/rust/pull/33895)
8122 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
8123 No targets use this yet, but it works toward AVR support.
8128 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
8129 * [The new follow-set rules that place restrictions on `macro_rules!`
8130 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
8131 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
8132 and has been a warning since 1.10.
8133 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
8134 This causes breakage in some corner cases.
8137 Version 1.10.0 (2016-07-07)
8138 ===========================
8143 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
8144 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
8145 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
8146 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
8147 * [`panic!` can be converted to a runtime abort with the
8148 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
8149 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8150 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
8151 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8152 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
8153 Note that Cargo does not yet directly support cdylibs.
8158 * `os::windows::fs::OpenOptionsExt::access_mode`
8159 * `os::windows::fs::OpenOptionsExt::share_mode`
8160 * `os::windows::fs::OpenOptionsExt::custom_flags`
8161 * `os::windows::fs::OpenOptionsExt::attributes`
8162 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
8163 * `os::unix::fs::OpenOptionsExt::custom_flags`
8164 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
8165 * `Default for sync::Weak`
8166 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
8167 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
8168 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
8169 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
8170 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
8171 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
8172 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
8173 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
8174 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
8175 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
8176 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
8177 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
8178 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
8179 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
8180 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
8181 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
8182 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
8183 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
8184 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
8185 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
8186 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
8187 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
8188 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8189 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8190 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8191 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8192 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8193 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8194 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8195 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8196 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8197 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8198 * Read/Write/RawFd impls for `UnixStream`
8199 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8200 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8201 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8202 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8203 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8204 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8205 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8206 * RawFd impls for `UnixListener`
8207 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8208 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8209 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8210 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8211 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8212 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8213 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8214 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8215 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8216 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8217 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8218 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8219 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8220 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8221 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8222 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8223 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8224 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8225 * RawFd impls for `UnixDatagram`
8226 * `{BTree,Hash}Map::values_mut`
8227 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8232 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8233 The semantics of this minor method are subtle and probably not what
8235 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8236 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8237 will fall back to `/dev/urandom` temporarily to avoid blocking
8238 during early boot](https://github.com/rust-lang/rust/pull/33086).
8239 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8240 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8241 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8242 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8243 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8244 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8245 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8249 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8250 This controls the runtime behavior of the `panic!` macro
8251 and can be either "unwind" (the default), or "abort".
8252 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8253 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8254 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8255 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8256 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8257 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8258 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8259 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8260 By default they are retried twice, which can be customized with the
8261 `net.retry` value in `.cargo/config`.
8262 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8263 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8264 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8265 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8266 Makes it possible to install multiple crates in parallel.
8267 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8268 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8269 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8270 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8271 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8272 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8277 * [rustc memory usage was reduced by refactoring the context used for
8278 type checking](https://github.com/rust-lang/rust/pull/33425).
8279 * [Speed up creation of `HashMap`s by caching the random keys used
8280 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8281 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8282 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8283 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8284 10x faster than the previous lookup tables.
8285 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8290 * Many incremental improvements to documentation and rustdoc.
8291 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8292 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8293 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8294 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8295 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8296 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8297 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8302 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8303 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8304 * [`std` no longer prints backtraces on platforms where the running
8305 module must be loaded with `env::current_exe`, which can't be relied
8306 on](https://github.com/rust-lang/rust/pull/33554).
8307 * This release includes std binaries for the i586-unknown-linux-gnu,
8308 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8309 i586 target is for old x86 hardware without SSE2, and the armv7
8310 target is for Android running on modern ARM architectures.
8311 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8312 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8313 * [On Unix the runtime aborts by calling `libc::abort` instead of
8314 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8315 * [Rust is now bootstrapped from the previous release of Rust,
8316 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8321 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8322 * [`target_env` for Linux ARM targets is just `gnu`, not
8323 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8324 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8325 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8326 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8327 Affects how macros are parsed.
8328 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8329 * [Feature-gated attributes on macro-generated macro invocations are
8330 now rejected](https://github.com/rust-lang/rust/pull/32791).
8331 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8332 This caused some minor changes to type inference.
8335 Version 1.9.0 (2016-05-26)
8336 ==========================
8341 * The `#[deprecated]` attribute when applied to an API will generate
8342 warnings when used. The warnings may be suppressed with
8343 `#[allow(deprecated)]`. [RFC 1270].
8344 * [`fn` item types are zero sized, and each `fn` names a unique
8345 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8346 `transmute` on a `fn` type will generate a warning for a few cycles,
8347 then will be converted to an error.
8348 * [Field and method resolution understand visibility, so private
8349 fields and methods cannot prevent the proper use of public fields
8350 and methods][1.9fv].
8351 * [The parser considers unicode codepoints in the
8352 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8358 * [`std::panic::catch_unwind`] (renamed from `recover`)
8359 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8360 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8361 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8362 * [`str::is_char_boundary`]
8363 * [`<*const T>::as_ref`]
8364 * [`<*mut T>::as_ref`]
8365 * [`<*mut T>::as_mut`]
8366 * [`AsciiExt::make_ascii_uppercase`]
8367 * [`AsciiExt::make_ascii_lowercase`]
8368 * [`char::decode_utf16`]
8369 * [`char::DecodeUtf16`]
8370 * [`char::DecodeUtf16Error`]
8371 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8372 * [`BTreeSet::take`]
8373 * [`BTreeSet::replace`]
8376 * [`HashSet::replace`]
8378 * [`OsString::with_capacity`]
8379 * [`OsString::clear`]
8380 * [`OsString::capacity`]
8381 * [`OsString::reserve`]
8382 * [`OsString::reserve_exact`]
8383 * [`OsStr::is_empty`]
8385 * [`std::os::unix::thread`]
8388 * [`JoinHandleExt::as_pthread_t`]
8389 * [`JoinHandleExt::into_pthread_t`]
8390 * [`HashSet::hasher`]
8391 * [`HashMap::hasher`]
8392 * [`CommandExt::exec`]
8393 * [`File::try_clone`]
8394 * [`SocketAddr::set_ip`]
8395 * [`SocketAddr::set_port`]
8396 * [`SocketAddrV4::set_ip`]
8397 * [`SocketAddrV4::set_port`]
8398 * [`SocketAddrV6::set_ip`]
8399 * [`SocketAddrV6::set_port`]
8400 * [`SocketAddrV6::set_flowinfo`]
8401 * [`SocketAddrV6::set_scope_id`]
8402 * [`slice::copy_from_slice`]
8403 * [`ptr::read_volatile`]
8404 * [`ptr::write_volatile`]
8405 * [`OpenOptions::create_new`]
8406 * [`TcpStream::set_nodelay`]
8407 * [`TcpStream::nodelay`]
8408 * [`TcpStream::set_ttl`]
8409 * [`TcpStream::ttl`]
8410 * [`TcpStream::set_only_v6`]
8411 * [`TcpStream::only_v6`]
8412 * [`TcpStream::take_error`]
8413 * [`TcpStream::set_nonblocking`]
8414 * [`TcpListener::set_ttl`]
8415 * [`TcpListener::ttl`]
8416 * [`TcpListener::set_only_v6`]
8417 * [`TcpListener::only_v6`]
8418 * [`TcpListener::take_error`]
8419 * [`TcpListener::set_nonblocking`]
8420 * [`UdpSocket::set_broadcast`]
8421 * [`UdpSocket::broadcast`]
8422 * [`UdpSocket::set_multicast_loop_v4`]
8423 * [`UdpSocket::multicast_loop_v4`]
8424 * [`UdpSocket::set_multicast_ttl_v4`]
8425 * [`UdpSocket::multicast_ttl_v4`]
8426 * [`UdpSocket::set_multicast_loop_v6`]
8427 * [`UdpSocket::multicast_loop_v6`]
8428 * [`UdpSocket::set_multicast_ttl_v6`]
8429 * [`UdpSocket::multicast_ttl_v6`]
8430 * [`UdpSocket::set_ttl`]
8431 * [`UdpSocket::ttl`]
8432 * [`UdpSocket::set_only_v6`]
8433 * [`UdpSocket::only_v6`]
8434 * [`UdpSocket::join_multicast_v4`]
8435 * [`UdpSocket::join_multicast_v6`]
8436 * [`UdpSocket::leave_multicast_v4`]
8437 * [`UdpSocket::leave_multicast_v6`]
8438 * [`UdpSocket::take_error`]
8439 * [`UdpSocket::connect`]
8440 * [`UdpSocket::send`]
8441 * [`UdpSocket::recv`]
8442 * [`UdpSocket::set_nonblocking`]
8447 * [`std::sync::Once` is poisoned if its initialization function
8449 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8450 * [Most types implement `fmt::Debug`][1.9db].
8451 * [The default buffer size used by `BufReader` and `BufWriter` was
8452 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8453 used by other languages.
8454 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8455 `Duration` additionally implements `*=` and `/=`][1.9ta].
8456 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8457 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8458 * [`Chain` implements `BufRead`][1.9ch].
8459 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8464 * [Cargo can now run concurrently][1.9cc].
8465 * [Top-level overrides allow specific revisions of crates to be
8466 overridden through the entire crate graph][1.9ct]. This is intended
8467 to make upgrades easier for large projects, by allowing crates to be
8468 forked temporarily until they've been upgraded and republished.
8469 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8470 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8471 on the commandline][1.9cf]. `rustc` arguments can also be specified
8472 in the `build.rustflags` configuration key.
8477 * [The time complexity of comparing variables for equivalence during type
8478 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8479 to major compilation time improvement in some scenarios.
8480 * [`ToString` is specialized for `str`, giving it the same performance
8481 as `to_owned`][1.9ts].
8482 * [Spawning processes with `Command::output` no longer creates extra
8484 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8485 for C-like enums][1.9cl].
8490 * [Passing the `--quiet` flag to a test runner will produce
8491 much-abbreviated output][1.9q].
8492 * The Rust Project now publishes std binaries for the
8493 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8494 `i586-pc-windows-msvc` targets.
8499 * [`std::sync::Once` is poisoned if its initialization function
8501 * [It is illegal to define methods with the same name in overlapping
8502 inherent `impl` blocks][1.9sn].
8503 * [`fn` item types are zero sized, and each `fn` names a unique
8504 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8505 `transmute` on a `fn` type will generate a warning for a few cycles,
8506 then will be converted to an error.
8507 * [Improvements to const evaluation may trigger new errors when integer
8508 literals are out of range][1.9ce].
8511 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8512 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8513 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8514 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8515 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8516 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8517 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8518 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8519 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8520 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8521 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8522 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8523 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8524 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8525 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8526 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8527 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8528 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8529 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8530 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8531 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8532 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8533 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8534 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8535 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8536 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8537 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8538 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8539 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8540 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8541 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8542 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8543 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8544 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8545 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8546 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8547 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8548 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8549 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8550 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8551 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8552 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8553 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8554 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8555 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8556 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8557 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8558 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8559 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8560 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8561 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8562 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8563 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8564 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8565 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8566 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8567 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8568 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8569 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8570 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8571 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8572 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8573 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8574 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8575 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8576 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8577 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8578 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8579 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8580 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8581 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8582 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8583 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8584 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8585 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8586 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8587 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8588 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8589 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8590 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8591 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8592 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8593 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8594 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8595 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8596 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8597 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8598 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8599 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8600 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8601 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8602 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8603 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8604 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8605 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8606 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8607 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8608 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8609 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8610 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8611 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8612 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8613 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8614 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8615 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8616 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8617 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8618 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8619 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8620 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8623 Version 1.8.0 (2016-04-14)
8624 ==========================
8629 * Rust supports overloading of compound assignment statements like
8630 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8631 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8632 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8634 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8635 addition to the non-braced form, `struct Foo;`. [RFC 218].
8641 * [`str::encode_utf16`] (renamed from `utf16_units`)
8642 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8645 * [`ptr::drop_in_place`]
8647 * [`time::SystemTime`]
8649 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8650 * [`Instant::elapsed`]
8651 * [`SystemTime::now`]
8652 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8653 * [`SystemTime::elapsed`]
8654 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8655 * [`SystemTimeError`]
8656 * [`SystemTimeError::duration`]
8657 * Various impls for `SystemTimeError`
8659 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8660 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8661 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8662 * [The `write!` and `writeln!` macros correctly emit errors if any of
8663 their arguments can't be formatted][1.8w].
8664 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8665 * [The Unix-specific `raw` modules, which contain a number of
8666 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8667 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8668 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8669 across platforms was making it difficult to implement `std`
8670 correctly. Those that need these definitions should use the `libc`
8672 * The Unix-specific `MetadataExt` traits, including
8673 `os::unix::fs::MetadataExt`, which expose values such as inode
8674 numbers [no longer return platform-specific types][1.8r], but
8675 instead return widened integers. [RFC 1415].
8676 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8677 * [Atomic loads and stores are not volatile][1.8a].
8678 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8683 * [Inlining hash functions lead to a 3% compile-time improvement in
8684 some workloads][1.8h].
8685 * When using jemalloc, its symbols are [unprefixed so that it
8686 overrides the libc malloc implementation][1.8h]. This means that for
8687 rustc, LLVM is now using jemalloc, which results in a 6%
8688 compile-time improvement on a specific workload.
8689 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8694 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8695 i686-pc-windows-msvc is now considered a tier-1 platform.
8696 * [The `--print targets` flag prints a list of supported targets][1.8t].
8697 * [The `--print cfg` flag prints the `cfg`s defined for the current
8699 * [`rustc` can be built with an new Cargo-based build system, written
8700 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8701 build system. To enable it configure with `configure --rustbuild`.
8702 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8703 variants while also indicating the total number of missing variants
8704 if more than 3][1.8m].
8705 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8706 * The Rust Project now publishes binary releases of the standard
8707 library for a number of tier-2 targets:
8708 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8709 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8710 `x86_64-rumprun-netbsd`. These can be installed with
8711 tools such as [multirust][1.8mr].
8716 * [`cargo init` creates a new Cargo project in the current
8717 directory][1.8ci]. It is otherwise like `cargo new`.
8718 * [Cargo has configuration keys for `-v` and
8719 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8720 `[term]` section of `.cargo/config`.
8721 * [Configuration keys that evaluate to strings or integers can be set
8722 via environment variables][1.8ce]. For example the `build.jobs` key
8723 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8724 precedence over config files.
8725 * [Target-specific dependencies support Rust `cfg` syntax for
8726 describing targets][1.8cfg] so that dependencies for multiple
8727 targets can be specified together. [RFC 1361].
8728 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8729 `RUSTDOC` take precedence over the `build.target-dir`,
8730 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8731 * [The child process tree is killed on Windows when Cargo is
8733 * [The `build.target` configuration value sets the target platform,
8734 like `--target`][1.8ct].
8739 * [Unstable compiler flags have been further restricted][1.8u]. Since
8740 1.0 `-Z` flags have been considered unstable, and other flags that
8741 were considered unstable additionally required passing `-Z
8742 unstable-options` to access. Unlike unstable language and library
8743 features though, these options have been accessible on the stable
8744 release channel. Going forward, *new unstable flags will not be
8745 available on the stable release channel*, and old unstable flags
8746 will warn about their usage. In the future, all unstable flags will
8747 be unavailable on the stable release channel.
8748 * [It is no longer possible to `match` on empty enum variants using
8749 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8750 * The Unix-specific `MetadataExt` traits, including
8751 `os::unix::fs::MetadataExt`, which expose values such as inode
8752 numbers [no longer return platform-specific types][1.8r], but
8753 instead return widened integers. [RFC 1415].
8754 * [Modules sourced from the filesystem cannot appear within arbitrary
8755 blocks, but only within other modules][1.8mf].
8756 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8757 * On Unix, [stack overflow triggers a runtime abort instead of a
8759 * [`Command::spawn` and its equivalents return an error if any of
8760 its command-line arguments contain interior `NUL`s][1.8n].
8761 * [Tuple and unit enum variants from other crates are in the type
8763 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8764 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8765 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8766 instead of `foo.lib`.
8769 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8770 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8771 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8772 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8773 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8774 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8775 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8776 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8777 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8778 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8779 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8780 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8781 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8782 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8783 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8784 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8785 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8786 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8787 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8788 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8789 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8790 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8791 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8792 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8793 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8794 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8795 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8796 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8797 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8798 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8799 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8800 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8801 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8802 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8803 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8804 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8805 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8806 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8807 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8808 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8809 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8810 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8811 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8812 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8813 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8814 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8815 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8816 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8817 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8818 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8819 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8820 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8821 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8822 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8823 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8824 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8825 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8826 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8827 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8828 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8831 Version 1.7.0 (2016-03-03)
8832 ==========================
8839 * [`Path::strip_prefix`] (renamed from relative_from)
8840 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8842 * [`Ipv4Addr::is_loopback`]
8843 * [`Ipv4Addr::is_private`]
8844 * [`Ipv4Addr::is_link_local`]
8845 * [`Ipv4Addr::is_multicast`]
8846 * [`Ipv4Addr::is_broadcast`]
8847 * [`Ipv4Addr::is_documentation`]
8849 * [`Ipv6Addr::is_unspecified`]
8850 * [`Ipv6Addr::is_loopback`]
8851 * [`Ipv6Addr::is_multicast`]
8854 * [`Vec::as_mut_slice`]
8856 * [`String::as_str`]
8857 * [`String::as_mut_str`]
8859 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8861 * `<[T]>::`[`sort_by_key`]
8862 * checked, saturated, and overflowing operations
8863 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8864 * [`i32::saturating_mul`]
8865 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8866 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8867 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8868 * [`u32::saturating_mul`]
8869 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8870 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8871 * and checked, saturated, and overflowing operations for other primitive types
8873 * [`ffi::IntoStringError`]
8874 * [`CString::into_string`]
8875 * [`CString::into_bytes`]
8876 * [`CString::into_bytes_with_nul`]
8877 * `From<CString> for Vec<u8>`
8879 * [`IntoStringError::into_cstring`]
8880 * [`IntoStringError::utf8_error`]
8881 * `Error for IntoStringError`
8883 * [`std::hash::BuildHasher`]
8884 * [`BuildHasher::Hasher`]
8885 * [`BuildHasher::build_hasher`]
8886 * [`std::hash::BuildHasherDefault`]
8887 * [`HashMap::with_hasher`]
8888 * [`HashMap::with_capacity_and_hasher`]
8889 * [`HashSet::with_hasher`]
8890 * [`HashSet::with_capacity_and_hasher`]
8891 * [`std::collections::hash_map::RandomState`]
8892 * [`RandomState::new`]
8893 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8894 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8895 from bytes is faster.
8896 * [The performance of `LineWriter` (and thus `io::stdout`) was
8897 improved by using `memchr` to search for newlines][1.7m].
8898 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8899 `f64` variants were stabilized previously.
8900 * [`BTreeMap` was rewritten to use less memory and improve the performance
8901 of insertion and iteration, the latter by as much as 5x][1.7bm].
8902 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8903 covariant over their contained type][1.7bt].
8904 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8905 over their contained type][1.7ll].
8906 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8908 * [`Any` is implemented for unsized types][1.7a].
8909 * [`Hash` is implemented for `Duration`][1.7h].
8914 * [When running tests with `--test`, rustdoc will pass `--cfg`
8915 arguments to the compiler][1.7dt].
8916 * [The compiler is built with RPATH information by default][1.7rpa].
8917 This means that it will be possible to run `rustc` when installed in
8918 unusual configurations without configuring the dynamic linker search
8920 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8921 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8922 over `LD_LIBRARY_PATH`.
8927 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8928 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8929 * [The `rerun-if-changed` build script directive no longer causes the
8930 build script to incorrectly run twice in certain scenarios][1.7rr].
8935 * Soundness fixes to the interactions between associated types and
8936 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8937 code that violates the new rules. This is a significant change that
8938 is known to break existing code, so it has emitted warnings for the
8939 new error cases since 1.4 to give crate authors time to adapt. The
8940 details of what is changing are subtle; read the RFC for more.
8941 * [Several bugs in the compiler's visibility calculations were
8942 fixed][1.7v]. Since this was found to break significant amounts of
8943 code, the new errors will be emitted as warnings for several release
8944 cycles, under the `private_in_public` lint.
8945 * Defaulted type parameters were accidentally accepted in positions
8946 that were not intended. In this release, [defaulted type parameters
8947 appearing outside of type definitions will generate a
8948 warning][1.7d], which will become an error in future releases.
8949 * [Parsing "." as a float results in an error instead of 0][1.7p].
8950 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8951 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8953 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8954 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8955 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8956 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8957 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8958 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8959 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8960 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8961 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8962 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8963 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8964 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8965 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8966 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8967 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8968 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8969 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8970 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8971 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8972 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8973 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8974 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8975 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8976 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8977 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8978 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8979 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8980 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8981 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8982 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8983 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8984 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8985 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8986 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8987 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8988 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8989 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8990 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8991 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8992 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8993 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8994 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8995 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8996 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8997 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8998 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8999 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9000 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
9001 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
9002 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
9003 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
9004 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
9005 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
9006 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
9007 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
9008 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
9009 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
9010 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
9011 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
9012 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
9013 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
9014 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
9015 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
9016 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
9017 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
9018 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
9019 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9020 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
9021 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
9022 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
9023 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
9024 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
9025 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
9026 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
9027 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
9028 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
9029 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
9030 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
9031 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
9034 Version 1.6.0 (2016-01-21)
9035 ==========================
9040 * The `#![no_std]` attribute causes a crate to not be linked to the
9041 standard library, but only the [core library][1.6co], as described
9042 in [RFC 1184]. The core library defines common types and traits but
9043 has no platform dependencies whatsoever, and is the basis for Rust
9044 software in environments that cannot support a full port of the
9045 standard library, such as operating systems. Most of the core
9046 library is now stable.
9052 [`Read::read_exact`],
9053 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9054 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
9055 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
9056 [`os::unix::fs::DirBuilderExt`],
9057 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
9058 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
9059 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
9060 [`collections::hash_map::Drain`],
9061 [`collections::hash_map::HashMap::drain`],
9062 [`collections::hash_set::Drain`],
9063 [`collections::hash_set::HashSet::drain`],
9064 [`collections::binary_heap::Drain`],
9065 [`collections::binary_heap::BinaryHeap::drain`],
9066 [`Vec::extend_from_slice`] (renamed from `push_all`),
9067 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9068 [`RwLock::into_inner`],
9069 [`Iterator::min_by_key`] (renamed from `min_by`),
9070 [`Iterator::max_by_key`] (renamed from `max_by`).
9071 * The [core library][1.6co] is stable, as are most of its APIs.
9072 * [The `assert_eq!` macro supports arguments that don't implement
9073 `Sized`][1.6ae], such as arrays. In this way it behaves more like
9075 * Several timer functions that take duration in milliseconds [are
9076 deprecated in favor of those that take `Duration`][1.6ms]. These
9077 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
9078 `thread::park_timeout_ms`.
9079 * The algorithm by which `Vec` reserves additional elements was
9080 [tweaked to not allocate excessive space][1.6a] while still growing
9082 * `From` conversions are [implemented from integers to floats][1.6f]
9083 in cases where the conversion is lossless. Thus they are not
9084 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
9085 or `f64`. They are also not implemented for `isize` and `usize`
9086 because the implementations would be platform-specific. `From` is
9087 also implemented from `f32` to `f64`.
9088 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
9089 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
9090 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
9091 * [`BinaryHeap` was refactored][1.6bh] for modest performance
9093 * Sorting slices that are already sorted [is 50% faster in some
9099 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
9100 * Cargo build scripts can specify their dependencies by emitting the
9101 [`rerun-if-changed`][1.6rr] key.
9102 * crates.io will reject publication of crates with dependencies that
9103 have a wildcard version constraint. Crates with wildcard
9104 dependencies were seen to cause a variety of problems, as described
9105 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
9107 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
9108 release folder. A variety of artifacts that Cargo failed to clean
9109 are now correctly deleted.
9114 * The `unreachable_code` lint [warns when a function call's argument
9116 * The parser indicates [failures that may be caused by
9117 confusingly-similar Unicode characters][1.6uc]
9118 * Certain macro errors [are reported at definition time][1.6m], not
9124 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
9125 environment variable when locating crates. This was a pre-cargo
9126 feature for integrating with the package manager that was
9127 accidentally never removed.
9128 * [A number of bugs were fixed in the privacy checker][1.6p] that
9129 could cause previously-accepted code to break.
9130 * [Modules and unit/tuple structs may not share the same name][1.6ts].
9131 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
9132 struct pattern syntax (`Foo(..)`) can no longer be used to match
9133 unit structs. This is a warning now, but will become an error in
9134 future releases. Patterns that share the same name as a const are
9136 * A bug was fixed that causes [rustc not to apply default type
9137 parameters][1.6xc] when resolving certain method implementations of
9138 traits defined in other crates.
9140 [1.6a]: https://github.com/rust-lang/rust/pull/29454
9141 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
9142 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
9143 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
9144 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
9145 [1.6co]: http://doc.rust-lang.org/core/index.html
9146 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
9147 [1.6f]: https://github.com/rust-lang/rust/pull/29129
9148 [1.6m]: https://github.com/rust-lang/rust/pull/29828
9149 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
9150 [1.6p]: https://github.com/rust-lang/rust/pull/29726
9151 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
9152 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
9153 [1.6s]: https://github.com/rust-lang/rust/pull/29675
9154 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
9155 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
9156 [1.6us]: https://github.com/rust-lang/rust/pull/29383
9157 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
9158 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
9159 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9160 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
9161 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
9162 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
9163 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
9164 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
9165 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
9166 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
9167 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
9168 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
9169 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
9170 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
9171 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
9172 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
9173 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
9174 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
9175 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
9176 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
9177 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
9178 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
9179 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
9180 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
9181 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
9182 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
9183 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
9184 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
9185 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
9186 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9189 Version 1.5.0 (2015-12-10)
9190 ==========================
9192 * ~700 changes, numerous bugfixes
9198 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9199 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9200 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9201 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9202 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9203 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9204 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9205 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9206 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9207 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9208 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9209 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9210 [`Path::read_link`], [`Path::symlink_metadata`],
9211 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9212 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9213 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9214 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9215 [`slice::split_first_mut`], [`slice::split_first`],
9216 [`slice::split_last_mut`], [`slice::split_last`],
9217 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9218 [`str::MatchIndices`], [`str::RMatchIndices`],
9219 [`str::match_indices`], [`str::rmatch_indices`],
9220 [`str::slice_mut_unchecked`], [`string::ParseError`].
9221 * Rust applications hosted on crates.io can be installed locally to
9222 `~/.cargo/bin` with the [`cargo install`] command. Among other
9223 things this makes it easier to augment Cargo with new subcommands:
9224 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9225 invoked as `cargo foo`.
9226 * Crates with wildcard (`*`) dependencies will [emit warnings when
9227 published][1.5w]. In 1.6 it will no longer be possible to publish
9228 crates with wildcard dependencies.
9233 * The rules determining when a particular lifetime must outlive
9234 a particular value (known as '[dropck]') have been [modified
9235 to not rely on parametricity][1.5p].
9236 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9237 and `Arc`][1.5a]. Because these smart pointer types implement
9238 `Deref`, this causes breakage in cases where the interior type
9239 contains methods of the same name.
9240 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9241 that they could drop their content. Soundness fix.
9242 * All method invocations are [properly checked][1.5wf1] for
9243 [well-formedness][1.5wf2]. Soundness fix.
9244 * Traits whose supertraits contain `Self` are [not object
9245 safe][1.5o]. Soundness fix.
9246 * Target specifications support a [`no_default_libraries`][1.5nd]
9247 setting that controls whether `-nodefaultlibs` is passed to the
9248 linker, and in turn the `is_like_windows` setting no longer affects
9249 the `-nodefaultlibs` flag.
9250 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9251 * The `#[inline]` and `#[repr]` attributes [can only appear
9252 in valid locations][1.5at].
9253 * Native libraries linked from the local crate are [passed to
9254 the linker before native libraries from upstream crates][1.5nl].
9255 * Two rarely-used attributes, `#[no_debug]` and
9256 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9257 * Negation of unsigned integers, which has been a warning for
9258 several releases, [is now behind a feature gate and will
9259 generate errors][1.5nu].
9260 * The parser accidentally accepted visibility modifiers on
9261 enum variants, a bug [which has been fixed][1.5ev].
9262 * [A bug was fixed that allowed `use` statements to import unstable
9268 * When evaluating expressions at compile-time that are not
9269 compile-time constants (const-evaluating expressions in non-const
9270 contexts), incorrect code such as overlong bitshifts and arithmetic
9271 overflow will [generate a warning instead of an error][1.5ce],
9272 delaying the error until runtime. This will allow the
9273 const-evaluator to be expanded in the future backwards-compatibly.
9274 * The `improper_ctypes` lint [no longer warns about using `isize` and
9275 `usize` in FFI][1.5ict].
9280 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9282 * `Default` is [implemented for mutable slices][1.5d].
9283 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9284 * There are now `From` conversions [between floating point
9285 types][1.5f] where the conversions are lossless.
9286 * There are now `From` conversions [between integer types][1.5i] where
9287 the conversions are lossless.
9288 * [`fs::Metadata` implements `Clone`][1.5fs].
9289 * The `parse` method [accepts a leading "+" when parsing
9291 * [`AsMut` is implemented for `Vec`][1.5am].
9292 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9293 been optimized][1.5cf] and no longer rely on the default impl.
9294 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9295 `unsafe extern "C"` function types now [implement `Clone`,
9296 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9297 `fmt::Debug` for up to 12 arguments][1.5fp].
9298 * [Dropping `Vec`s is much faster in unoptimized builds when the
9299 element types don't implement `Drop`][1.5dv].
9300 * A bug that caused in incorrect behavior when [combining `VecDeque`
9301 with zero-sized types][1.5vdz] was resolved.
9302 * [`PartialOrd` for slices is faster][1.5po].
9307 * [Crate metadata size was reduced by 20%][1.5md].
9308 * [Improvements to code generation reduced the size of libcore by 3.3
9309 MB and rustc's memory usage by 18MB][1.5m].
9310 * [Improvements to deref translation increased performance in
9311 unoptimized builds][1.5dr].
9312 * Various errors in trait resolution [are deduplicated to only be
9313 reported once][1.5te].
9314 * Rust has preliminary [support for rumprun kernels][1.5rr].
9315 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9317 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9318 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9319 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9320 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9321 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9322 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9323 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9324 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9325 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9326 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9327 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9328 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9329 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9330 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9331 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9332 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9333 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9334 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9335 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9336 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9337 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9338 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9339 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9340 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9341 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9342 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9343 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9344 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9345 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9346 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9347 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9348 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9349 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9350 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9351 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9352 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9353 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9354 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9355 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9356 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9357 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9358 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9359 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9360 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9361 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9362 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9363 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9364 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9365 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9366 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9367 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9368 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9369 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9370 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9371 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9372 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9373 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9374 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9375 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9376 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9377 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9378 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9379 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9380 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9381 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9382 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9383 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9384 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9385 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9386 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9387 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9388 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9389 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9390 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9391 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9392 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9393 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9394 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9395 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9396 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9397 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9398 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9399 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9400 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9401 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9402 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9403 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9404 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9405 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9407 Version 1.4.0 (2015-10-29)
9408 ==========================
9410 * ~1200 changes, numerous bugfixes
9415 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9416 GNU) are now supported and recommended for use.
9421 * [Several changes have been made to fix type soundness and improve
9422 the behavior of associated types][sound]. See [RFC 1214]. Although
9423 we have mostly introduced these changes as warnings this release, to
9424 become errors next release, there are still some scenarios that will
9425 see immediate breakage.
9426 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9427 line breaks in addition to `\n`][crlf].
9428 * [Loans of `'static` lifetime extend to the end of a function][stat].
9429 * [`str::parse` no longer introduces avoidable rounding error when
9430 parsing floating point numbers. Together with earlier changes to
9431 float formatting/output, "round trips" like f.to_string().parse()
9432 now preserve the value of f exactly. Additionally, leading plus
9433 signs are now accepted][fp3].
9439 * `use` statements that import multiple items [can now rename
9440 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9441 * [Binops work correctly on fat pointers][binfat].
9442 * `pub extern crate`, which does not behave as expected, [issues a
9443 warning][pec] until a better solution is found.
9448 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9449 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9450 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9451 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9452 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9453 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9454 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9455 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9456 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9457 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9458 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9459 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9460 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9461 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9462 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9463 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9464 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9465 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9467 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9468 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9469 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9470 `f64::from_str_radix`.
9471 * [Reverse-searching strings is faster with the 'two-way'
9473 * [`std::io::copy` allows `?Sized` arguments][cc].
9474 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9475 [override `count`, `nth` and `last` with an *O*(1)
9476 implementation][it].
9477 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9478 * [`IntoRawFd` has been added to the Unix-specific prelude,
9479 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9481 * [`Extend<String>` and `FromIterator<String` are both implemented for
9483 * [`IntoIterator` is implemented for references to `Option` and
9485 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9486 Copy`][ext] as part of [RFC 839]. This will cause type inference
9487 breakage in rare situations.
9488 * [`BinaryHeap` implements `Debug`][bh2].
9489 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9491 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9492 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9493 * [String comparison is faster][faststr].
9494 * `&mut T` where `T: std::fmt::Write` [also implements
9495 `std::fmt::Write`][mutw].
9496 * [A stable regression in `VecDeque::push_back` and other
9497 capacity-altering methods that caused panics for zero-sized types
9499 * [Function pointers implement traits for up to 12 parameters][fp2].
9504 * The compiler [no longer uses the 'morestack' feature to prevent
9505 stack overflow][mm]. Instead it uses guard pages and stack
9506 probes (though stack probes are not yet implemented on any platform
9508 * [The compiler matches traits faster when projections are involved][p].
9509 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9511 * [Cargo now displays useful information about what its doing during
9512 `cargo update`][cu].
9514 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9515 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9516 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9517 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9518 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9519 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9520 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9521 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9522 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9523 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9524 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9525 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9526 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9527 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9528 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9529 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9530 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9531 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9532 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9533 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9534 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9535 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9536 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9537 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9538 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9539 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9540 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9541 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9542 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9543 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9544 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9545 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9546 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9547 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9548 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9549 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9550 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9551 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9552 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9553 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9554 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9555 [bh2]: https://github.com/rust-lang/rust/pull/28156
9556 [binfat]: https://github.com/rust-lang/rust/pull/28270
9557 [bm]: https://github.com/rust-lang/rust/pull/28197
9558 [cc]: https://github.com/rust-lang/rust/pull/27531
9559 [crlf]: https://github.com/rust-lang/rust/pull/28034
9560 [cu]: https://github.com/rust-lang/cargo/pull/1931
9561 [d]: https://github.com/rust-lang/rust/pull/27825
9562 [dep]: https://github.com/rust-lang/rust/pull/28339
9563 [es]: https://github.com/rust-lang/rust/pull/27956
9564 [ext]: https://github.com/rust-lang/rust/pull/28094
9565 [faststr]: https://github.com/rust-lang/rust/pull/28338
9566 [ffi]: https://github.com/rust-lang/rust/pull/28779
9567 [fp]: https://github.com/rust-lang/rust/pull/28268
9568 [fp2]: https://github.com/rust-lang/rust/pull/28560
9569 [fp3]: https://github.com/rust-lang/rust/pull/27307
9570 [i]: https://github.com/rust-lang/rust/pull/27451
9571 [into2]: https://github.com/rust-lang/rust/pull/28039
9572 [it]: https://github.com/rust-lang/rust/pull/27652
9573 [mm]: https://github.com/rust-lang/rust/pull/27338
9574 [mutw]: https://github.com/rust-lang/rust/pull/28368
9575 [sound]: https://github.com/rust-lang/rust/pull/27641
9576 [p]: https://github.com/rust-lang/rust/pull/27866
9577 [pec]: https://github.com/rust-lang/rust/pull/28486
9578 [pr]: https://github.com/rust-lang/rust/pull/27896
9579 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9580 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9581 [s]: https://github.com/rust-lang/rust/pull/27474
9582 [stab]: https://github.com/rust-lang/rust/pull/28339
9583 [stat]: https://github.com/rust-lang/rust/pull/28321
9584 [vd]: https://github.com/rust-lang/rust/pull/28494
9586 Version 1.3.0 (2015-09-17)
9587 ==============================
9589 * ~900 changes, numerous bugfixes
9594 * The [new object lifetime defaults][nold] have been [turned
9595 on][nold2] after a cycle of warnings about the change. Now types
9596 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9597 being interpreted as `&'a Box<Trait+'a>` to `&'a
9598 Box<Trait+'static>`.
9599 * [The Rustonomicon][nom] is a new book in the official documentation
9600 that dives into writing unsafe Rust.
9601 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9602 timekeeping is employed by other std APIs, as well as out-of-tree
9608 * The [new object lifetime defaults][nold] have been [turned
9609 on][nold2] after a cycle of warnings about the change.
9610 * There is a known [regression][lr] in how object lifetime elision is
9611 interpreted, the proper solution for which is undetermined.
9612 * The `#[prelude_import]` attribute, an internal implementation
9613 detail, was accidentally stabilized previously. [It has been put
9614 behind the `prelude_import` feature gate][pi]. This change is
9615 believed to break no existing code.
9616 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9617 [more sane for dynamically sized types][dst3]. Code that relied on
9618 the previous behavior is thought to be broken.
9619 * The `dropck` rules, which checks that destructors can't access
9620 destroyed values, [have been updated][dropck] to match the
9621 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9622 cause some previously-compiling code to no longer build.
9627 * The [new object lifetime defaults][nold] have been [turned
9628 on][nold2] after a cycle of warnings about the change.
9629 * Semicolons may [now follow types and paths in
9630 macros](https://github.com/rust-lang/rust/pull/27000).
9631 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9632 [more sane for dynamically sized types][dst3]. Code that relied on
9633 the previous behavior is not known to exist, and suspected to be
9635 * `'static` variables [may now be recursive][st].
9636 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9637 implementations correctly.
9638 * The `dropck` rules, which checks that destructors can't access
9639 destroyed values, [have been updated][dropck] to match the
9645 * The [`Duration`] API, [has been stabilized][ds], as well as the
9646 `std::time` module, which presently contains only `Duration`.
9647 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9648 * The owned C string, [`CString`], implements [`Borrow`] and the
9649 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9650 these allow C strings to be borrowed and cloned in generic code.
9651 * [`CStr`] implements [`Debug`].
9652 * [`AtomicPtr`] implements [`Debug`].
9653 * [`Error`] trait objects [can be downcast to their concrete types][e]
9654 in many common configurations, using the [`is`], [`downcast`],
9655 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9657 * Searching for substrings now [employs the two-way algorithm][search]
9658 instead of doing a naive search. This gives major speedups to a
9659 number of methods, including [`contains`][sc], [`find`][sf],
9660 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9661 [`ends_with`][sew] are also faster.
9662 * The performance of `PartialEq` for slices is [much faster][ps].
9663 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9664 is overridden and optimized by the implementations for scalars.
9665 * The [`Hasher`] trait now has a number of specialized `write_*`
9666 methods for primitive types, for efficiency.
9667 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9668 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9669 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9670 of [`std::error::Error::cause`][iec] also delegates to the inner
9672 * [`process::Child`][pc] gained the [`id`] method, which returns a
9673 `u32` representing the platform-specific process identifier.
9674 * The [`connect`] method on slices is deprecated, replaced by the new
9675 [`join`] method (note that both of these are on the *unstable*
9676 [`SliceConcatExt`] trait, but through the magic of the prelude are
9677 available to stable code anyway).
9678 * The [`Div`] operator is implemented for [`Wrapping`] types.
9679 * [`DerefMut` is implemented for `String`][dms].
9680 * Performance of SipHash (the default hasher for `HashMap`) is
9681 [better for long data][sh].
9682 * [`AtomicPtr`] implements [`Send`].
9683 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9684 are now [specialized to use uninitialized buffers for increased
9686 * Lifetime parameters of foreign functions [are now resolved
9692 * Rust can now, with some coercion, [produce programs that run on
9693 Windows XP][xp], though XP is not considered a supported platform.
9694 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9695 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9696 recommended for use in 1.3, though should be fully-functional
9697 in the [64-bit 1.4 beta][b14].
9698 * On Fedora-based systems installation will [properly configure the
9699 dynamic linker][fl].
9700 * The compiler gained many new extended error descriptions, which can
9701 be accessed with the `--explain` flag.
9702 * The `dropck` pass, which checks that destructors can't access
9703 destroyed values, [has been rewritten][27261]. This fixes some
9704 soundness holes, and as such will cause some previously-compiling
9705 code to no longer build.
9706 * `rustc` now uses [LLVM to write archive files where possible][ar].
9707 Eventually this will eliminate the compiler's dependency on the ar
9709 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9710 supported FreeBSD on x86_64).
9711 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9712 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9714 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9715 will kill the process instead of leaking][nlp].
9717 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9718 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9719 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9720 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9721 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9722 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9723 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9724 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9725 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9726 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9727 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9728 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9729 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9730 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9731 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9732 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9733 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9734 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9735 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9736 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9737 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9738 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9739 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9740 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9741 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9742 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9743 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9744 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9745 [ar]: https://github.com/rust-lang/rust/pull/26926
9746 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9747 [dms]: https://github.com/rust-lang/rust/pull/26241
9748 [27261]: https://github.com/rust-lang/rust/pull/27261
9749 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9750 [ds]: https://github.com/rust-lang/rust/pull/26818
9751 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9752 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9753 [dst3]: https://github.com/rust-lang/rust/pull/27351
9754 [e]: https://github.com/rust-lang/rust/pull/24793
9755 [f]: https://github.com/rust-lang/rust/pull/26588
9756 [26959]: https://github.com/rust-lang/rust/pull/26959
9757 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9758 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9759 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9760 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9761 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9762 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9763 [lic]: https://github.com/rust-lang/rust/pull/26583
9764 [lnu]: https://github.com/rust-lang/rust/pull/27026
9765 [lr]: https://github.com/rust-lang/rust/issues/27248
9766 [lum]: https://github.com/rust-lang/rust/pull/26378
9767 [lur]: https://github.com/rust-lang/rust/pull/26783
9768 [nlp]: https://github.com/rust-lang/rust/pull/27176
9769 [nold2]: https://github.com/rust-lang/rust/pull/27045
9770 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9771 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9772 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9773 [pi]: https://github.com/rust-lang/rust/pull/26699
9774 [ps]: https://github.com/rust-lang/rust/pull/26884
9775 [rte]: https://github.com/rust-lang/rust/pull/26950
9776 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9777 [search]: https://github.com/rust-lang/rust/pull/26327
9778 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9779 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9780 [sh]: https://github.com/rust-lang/rust/pull/27280
9781 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9782 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9783 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9784 [st]: https://github.com/rust-lang/rust/pull/26630
9785 [win1]: https://github.com/rust-lang/rust/pull/26569
9786 [win2]: https://github.com/rust-lang/rust/pull/26741
9787 [win3]: https://github.com/rust-lang/rust/pull/26741
9788 [win4]: https://github.com/rust-lang/rust/pull/27210
9789 [xp]: https://github.com/rust-lang/rust/pull/26569
9791 Version 1.2.0 (2015-08-07)
9792 ==========================
9794 * ~1200 changes, numerous bugfixes
9799 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9800 like `Rc` to contain types without a fixed size, arrays and trait
9801 objects, finally enabling use of `Rc<[T]>` and completing the
9802 implementation of DST.
9803 * [Parallel codegen][parcodegen] is now working again, which can
9804 substantially speed up large builds in debug mode; It also gets
9805 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9806 jobs). It's not enabled by default, but will be "in the near
9807 future". It can be activated with the `-C codegen-units=N` flag to
9809 * This is the first release with [experimental support for linking
9810 with the MSVC linker and lib C on Windows (instead of using the GNU
9811 variants via MinGW)][win]. It is yet recommended only for the most
9812 intrepid Rustaceans.
9813 * Benchmark compilations are showing a 30% improvement in
9814 bootstrapping over 1.1.
9819 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9820 unicode case mapping, which is a previously-planned change in
9821 behavior and considered a bugfix.
9822 * [`mem::align_of`] now specifies [the *minimum alignment* for
9823 T][align], which is usually the alignment programs are interested
9824 in, and the same value reported by clang's
9825 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9827 * [The `#[packed]` attribute is no longer silently accepted by the
9828 compiler][packed]. This attribute did nothing and code that
9829 mentioned it likely did not work as intended.
9830 * Associated type defaults are [now behind the
9831 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9832 defaults *did not work*, but could be mentioned syntactically. As
9833 such this breakage has minimal impact.
9838 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9839 matching against dereferenceable values.
9844 * The [`Extend`] trait, which grows a collection from an iterator, is
9845 implemented over iterators of references, for `String`, `Vec`,
9846 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9847 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9848 * The [`iter::once`] function returns an iterator that yields a single
9849 element, and [`iter::empty`] returns an iterator that yields no
9851 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9852 over substring matches.
9853 * [`Cell`] and [`RefCell`] both implement `Eq`.
9854 * A number of methods for wrapping arithmetic are added to the
9855 integral types, [`wrapping_div`], [`wrapping_rem`],
9856 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9857 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9858 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9859 type.. It is illegal for the default arithmetic operations in Rust
9860 to overflow; the desire to wrap must be explicit.
9861 * The `{:#?}` formatting specifier [displays the alternate,
9862 pretty-printed][debugfmt] form of the `Debug` formatter. This
9863 feature was actually introduced prior to 1.0 with little
9865 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9866 for writing data to formatted strings, similar to [`io::Write`].
9867 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9868 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9869 are used by code generators to emit implementations of [`Debug`].
9870 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9871 methods that convert case, following Unicode case mapping.
9872 * It is now easier to handle poisoned locks. The [`PoisonError`]
9873 type, returned by failing lock operations, exposes `into_inner`,
9874 `get_ref`, and `get_mut`, which all give access to the inner lock
9875 guard, and allow the poisoned lock to continue to operate. The
9876 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9877 poisoned lock without attempting to take the lock.
9878 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9879 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9880 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9881 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9883 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9889 * `rustc` employs smarter heuristics for guessing at [typos].
9890 * `rustc` emits more efficient code for [no-op conversions between
9891 unsafe pointers][nop].
9892 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9893 resulting in faster compile times and smaller code.
9895 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9896 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9897 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9898 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9899 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9900 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9901 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9902 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9903 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9904 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9905 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9906 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9907 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9908 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9909 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9910 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9911 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9912 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9913 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9914 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9915 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9916 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9917 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9918 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9919 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9920 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9921 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9922 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9923 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9924 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9925 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9926 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9927 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9928 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9929 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9930 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9931 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9932 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9933 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9934 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9935 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9936 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9937 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9938 [align]: https://github.com/rust-lang/rust/pull/25646
9939 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9940 [typos]: https://github.com/rust-lang/rust/pull/26087
9941 [nop]: https://github.com/rust-lang/rust/pull/26336
9942 [fat]: https://github.com/rust-lang/rust/pull/26411
9943 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9944 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9945 [packed]: https://github.com/rust-lang/rust/pull/25541
9946 [ad]: https://github.com/rust-lang/rust/pull/27382
9947 [win]: https://github.com/rust-lang/rust/pull/25350
9949 Version 1.1.0 (2015-06-25)
9950 =========================
9952 * ~850 changes, numerous bugfixes
9957 * The [`std::fs` module has been expanded][fs] to expand the set of
9958 functionality exposed:
9959 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9960 don't incur a syscall on some platforms.
9961 * A `symlink_metadata` function has been added.
9962 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9963 access to all underlying information.
9964 * The compiler now contains extended explanations of many errors. When an error
9965 with an explanation occurs the compiler suggests using the `--explain` flag
9966 to read the explanation. Error explanations are also [available online][err-index].
9967 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9968 well as other work, the time to bootstrap the compiler decreased by
9974 * The [`str::split_whitespace`] method splits a string on unicode
9975 whitespace boundaries.
9976 * On both Windows and Unix, new extension traits provide conversion of
9977 I/O types to and from the underlying system handles. On Unix, these
9978 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9979 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9980 `TcpListener`, and `UpdSocket`. Further implementations for
9981 `std::process` will be stabilized later.
9982 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9983 Windows, symlinks can be created with
9984 `std::os::windows::symlink_dir` and
9985 `std::os::windows::symlink_file`.
9986 * The `mpsc::Receiver` type can now be converted into an iterator with
9987 `into_iter` on the [`IntoIterator`] trait.
9988 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9989 implementation of the [`From`] trait.
9990 * The `Debug` implementation for `RangeFull` [creates output that is
9991 more consistent with other implementations][rf].
9992 * [`Debug` is implemented for `File`][file].
9993 * The `Default` implementation for `Arc` [no longer requires `Sync +
9995 * [The `Iterator` methods `count`, `nth`, and `last` have been
9996 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9997 * Incorrect handling of paths on Windows has been improved in both the
9998 compiler and the standard library.
9999 * [`AtomicPtr` gained a `Default` implementation][ap].
10000 * In accordance with Rust's policy on arithmetic overflow `abs` now
10001 [panics on overflow when debug assertions are enabled][abs].
10002 * The [`Cloned`] iterator, which was accidentally left unstable for
10003 1.0 [has been stabilized][c].
10004 * The [`Incoming`] iterator, which iterates over incoming TCP
10005 connections, and which was accidentally unnamable in 1.0, [is now
10006 properly exported][inc].
10007 * [`BinaryHeap`] no longer corrupts itself [when functions called by
10008 `sift_up` or `sift_down` panic][bh].
10009 * The [`split_off`] method of `LinkedList` [no longer corrupts
10010 the list in certain scenarios][ll].
10015 * Type checking performance [has improved notably][sk] with
10016 [multiple improvements][pre].
10017 * The compiler [suggests code changes][ch] for more errors.
10018 * rustc and it's build system have experimental support for [building
10019 toolchains against MUSL][m] instead of glibc on Linux.
10020 * The compiler defines the `target_env` cfg value, which is used for
10021 distinguishing toolchains that are otherwise for the same
10022 platform. Presently this is set to `gnu` for common GNU Linux
10023 targets and for MinGW targets, and `musl` for MUSL Linux targets.
10024 * The [`cargo rustc`][crc] command invokes a build with custom flags
10026 * [Android executables are always position independent][pie].
10027 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
10028 with `Drop`][24935].
10030 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
10031 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
10032 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
10033 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
10034 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
10035 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
10036 [rf]: https://github.com/rust-lang/rust/pull/24491
10037 [err-index]: https://doc.rust-lang.org/error-index.html
10038 [sk]: https://github.com/rust-lang/rust/pull/24615
10039 [pre]: https://github.com/rust-lang/rust/pull/25323
10040 [file]: https://github.com/rust-lang/rust/pull/24598
10041 [ch]: https://github.com/rust-lang/rust/pull/24683
10042 [arc]: https://github.com/rust-lang/rust/pull/24695
10043 [si]: https://github.com/rust-lang/rust/pull/24701
10044 [ap]: https://github.com/rust-lang/rust/pull/24834
10045 [m]: https://github.com/rust-lang/rust/pull/24777
10046 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
10047 [crc]: https://github.com/rust-lang/cargo/pull/1568
10048 [pie]: https://github.com/rust-lang/rust/pull/24953
10049 [abs]: https://github.com/rust-lang/rust/pull/25441
10050 [c]: https://github.com/rust-lang/rust/pull/25496
10051 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
10052 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
10053 [inc]: https://github.com/rust-lang/rust/pull/25522
10054 [bh]: https://github.com/rust-lang/rust/pull/25856
10055 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
10056 [ll]: https://github.com/rust-lang/rust/pull/26022
10057 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
10058 [24935]: https://github.com/rust-lang/rust/pull/24935
10060 Version 1.0.0 (2015-05-15)
10061 ========================
10063 * ~1500 changes, numerous bugfixes
10068 * The vast majority of the standard library is now `#[stable]`. It is
10069 no longer possible to use unstable features with a stable build of
10071 * Many popular crates on [crates.io] now work on the stable release
10073 * Arithmetic on basic integer types now [checks for overflow in debug
10079 * Several [restrictions have been added to trait coherence][coh] in
10080 order to make it easier for upstream authors to change traits
10081 without breaking downstream code.
10082 * Digits of binary and octal literals are [lexed more eagerly][lex] to
10083 improve error messages and macro behavior. For example, `0b1234` is
10084 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
10085 * Trait bounds [are always invariant][inv], eliminating the need for
10086 the `PhantomFn` and `MarkerTrait` lang items, which have been
10088 * ["-" is no longer a valid character in crate names][cr], the `extern crate
10089 "foo" as bar` syntax has been replaced with `extern crate foo as
10090 bar`, and Cargo now automatically translates "-" in *package* names
10091 to underscore for the crate name.
10092 * [Lifetime shadowing is an error][lt].
10093 * [`Send` no longer implies `'static`][send-rfc].
10094 * [UFCS now supports trait-less associated paths][moar-ufcs] like
10095 `MyType::default()`.
10096 * Primitive types [now have inherent methods][prim-inherent],
10097 obviating the need for extension traits like `SliceExt`.
10098 * Methods with `Self: Sized` in their `where` clause are [considered
10099 object-safe][self-sized], allowing many extension traits like
10100 `IteratorExt` to be merged into the traits they extended.
10101 * You can now [refer to associated types][assoc-where] whose
10102 corresponding trait bounds appear only in a `where` clause.
10103 * The final bits of [OIBIT landed][oibit-final], meaning that traits
10104 like `Send` and `Sync` are now library-defined.
10105 * A [Reflect trait][reflect] was introduced, which means that
10106 downcasting via the `Any` trait is effectively limited to concrete
10107 types. This helps retain the potentially-important "parametricity"
10108 property: generic code cannot behave differently for different type
10109 arguments except in minor ways.
10110 * The `unsafe_destructor` feature is now deprecated in favor of the
10111 [new `dropck`][rfc769]. This change is a major reduction in unsafe
10117 * The `thread_local` module [has been renamed to `std::thread`][th].
10118 * The methods of `IteratorExt` [have been moved to the `Iterator`
10119 trait itself][23300].
10120 * Several traits that implement Rust's conventions for type
10121 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
10122 [centralized in the `std::convert` module][con].
10123 * The `FromError` trait [was removed in favor of `From`][fe].
10124 * The basic sleep function [has moved to
10125 `std::thread::sleep_ms`][slp].
10126 * The `splitn` function now takes an `n` parameter that represents the
10127 number of items yielded by the returned iterator [instead of the
10128 number of 'splits'][spl].
10129 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
10130 * [Derived implementations of `PartialOrd` now order enums according
10131 to their explicitly-assigned discriminants][po].
10132 * [Methods for searching strings are generic over `Pattern`s][pat],
10133 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
10135 * [In method resolution, object methods are resolved before inherent
10137 * [`String::from_str` has been deprecated in favor of the `From` impl,
10138 `String::from`][24517].
10139 * [`io::Error` implements `Sync`][ios].
10140 * [The `words` method on `&str` has been replaced with
10141 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
10143 * The new path and IO modules are complete and `#[stable]`. This
10144 was the major library focus for this cycle.
10145 * The path API was [revised][path-normalize] to normalize `.`,
10146 adjusting the tradeoffs in favor of the most common usage.
10147 * A large number of remaining APIs in `std` were also stabilized
10148 during this cycle; about 75% of the non-deprecated API surface
10150 * The new [string pattern API][string-pattern] landed, which makes
10151 the string slice API much more internally consistent and flexible.
10152 * A new set of [generic conversion traits][conversion] replaced
10153 many existing ad hoc traits.
10154 * Generic numeric traits were [completely removed][num-traits]. This
10155 was made possible thanks to inherent methods for primitive types,
10156 and the removal gives maximal flexibility for designing a numeric
10157 hierarchy in the future.
10158 * The `Fn` traits are now related via [inheritance][fn-inherit]
10159 and provide ergonomic [blanket implementations][fn-blanket].
10160 * The `Index` and `IndexMut` traits were changed to
10161 [take the index by value][index-value], enabling code like
10162 `hash_map["string"]` to work.
10163 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
10164 `Copy` data is known to be `Clone` as well.
10169 * Many errors now have extended explanations that can be accessed with
10170 the `--explain` flag to `rustc`.
10171 * Many new examples have been added to the standard library
10173 * rustdoc has received a number of improvements focused on completion
10175 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
10176 * Much headway was made on ecosystem-wide CI, making it possible
10177 to [compare builds for breakage][ci-compare].
10180 [crates.io]: http://crates.io
10181 [clo]: https://github.com/rust-lang/rust/pull/24034
10182 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
10183 [con]: https://github.com/rust-lang/rust/pull/23875
10184 [cr]: https://github.com/rust-lang/rust/pull/23419
10185 [fe]: https://github.com/rust-lang/rust/pull/23879
10186 [23300]: https://github.com/rust-lang/rust/pull/23300
10187 [inv]: https://github.com/rust-lang/rust/pull/23938
10188 [ios]: https://github.com/rust-lang/rust/pull/24133
10189 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10190 [lt]: https://github.com/rust-lang/rust/pull/24057
10191 [meth]: https://github.com/rust-lang/rust/pull/24056
10192 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10193 [po]: https://github.com/rust-lang/rust/pull/24270
10194 [24517]: https://github.com/rust-lang/rust/pull/24517
10195 [slp]: https://github.com/rust-lang/rust/pull/23949
10196 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10197 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10198 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10199 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10200 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10201 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10202 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10203 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10204 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10205 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10206 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10207 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10208 [reflect]: https://github.com/rust-lang/rust/pull/23712
10209 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10210 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10211 [index-value]: https://github.com/rust-lang/rust/pull/23601
10212 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10213 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10214 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10215 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10216 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10217 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10220 Version 1.0.0-alpha.2 (2015-02-20)
10221 =====================================
10223 * ~1300 changes, numerous bugfixes
10227 * The various I/O modules were [overhauled][io-rfc] to reduce
10228 unnecessary abstractions and provide better interoperation with
10229 the underlying platform. The old `io` module remains temporarily
10231 * The standard library now [participates in feature gating][feat],
10232 so use of unstable libraries now requires a `#![feature(...)]`
10233 attribute. The impact of this change is [described on the
10234 forum][feat-forum]. [RFC][feat-rfc].
10238 * `for` loops [now operate on the `IntoIterator` trait][into],
10239 which eliminates the need to call `.iter()`, etc. to iterate
10240 over collections. There are some new subtleties to remember
10241 though regarding what sort of iterators various types yield, in
10242 particular that `for foo in bar { }` yields values from a move
10243 iterator, destroying the original collection. [RFC][into-rfc].
10244 * Objects now have [default lifetime bounds][obj], so you don't
10245 have to write `Box<Trait+'static>` when you don't care about
10246 storing references. [RFC][obj-rfc].
10247 * In types that implement `Drop`, [lifetimes must outlive the
10248 value][drop]. This will soon make it possible to safely
10249 implement `Drop` for types where `#[unsafe_destructor]` is now
10250 required. Read the [gorgeous RFC][drop-rfc] for details.
10251 * The fully qualified <T as Trait>::X syntax lets you set the Self
10252 type for a trait method or associated type. [RFC][ufcs-rfc].
10253 * References to types that implement `Deref<U>` now [automatically
10254 coerce to references][deref] to the dereferenced type `U`,
10255 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10256 should eliminate many unsightly uses of `&*`, as when converting
10257 from references to vectors into references to
10258 slices. [RFC][deref-rfc].
10259 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10260 `|:|`) is obsolete and closure kind is inferred from context.
10261 * [`Self` is a keyword][Self].
10265 * The `Show` and `String` formatting traits [have been
10266 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10267 their related purposes. Automatically getting a string
10268 conversion to use with `format!("{:?}", something_to_debug)` is
10269 now written `#[derive(Debug)]`.
10270 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10271 OsStr}`, provide strings in platform-specific encodings for easier
10272 interop with system APIs. [RFC][osstr-rfc].
10273 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10274 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10275 creating raw pointers.
10279 * Certain long error messages of the form 'expected foo found bar'
10280 are now [split neatly across multiple
10281 lines][multiline]. Examples in the PR.
10282 * On Unix Rust can be [uninstalled][un] by running
10283 `/usr/local/lib/rustlib/uninstall.sh`.
10284 * The `#[rustc_on_unimplemented]` attribute, requiring the
10285 'on_unimplemented' feature, lets rustc [display custom error
10286 messages when a trait is expected to be implemented for a type
10291 * Rust is tested against a [LALR grammar][lalr], which parses
10292 almost all the Rust files that rustc does.
10294 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10295 [close]: https://github.com/rust-lang/rust/pull/21843
10296 [deref]: https://github.com/rust-lang/rust/pull/21351
10297 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10298 [drop]: https://github.com/rust-lang/rust/pull/21972
10299 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10300 [feat]: https://github.com/rust-lang/rust/pull/21248
10301 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10302 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10303 [fmt]: https://github.com/rust-lang/rust/pull/21457
10304 [into]: https://github.com/rust-lang/rust/pull/20790
10305 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10306 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10307 [lalr]: https://github.com/rust-lang/rust/pull/21452
10308 [multiline]: https://github.com/rust-lang/rust/pull/19870
10309 [obj]: https://github.com/rust-lang/rust/pull/22230
10310 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10311 [onun]: https://github.com/rust-lang/rust/pull/20889
10312 [osstr]: https://github.com/rust-lang/rust/pull/21488
10313 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10314 [Self]: https://github.com/rust-lang/rust/pull/22158
10315 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10316 [un]: https://github.com/rust-lang/rust/pull/22256
10319 Version 1.0.0-alpha (2015-01-09)
10320 ==================================
10322 * ~2400 changes, numerous bugfixes
10326 * The language itself is considered feature complete for 1.0,
10327 though there will be many usability improvements and bugfixes
10328 before the final release.
10329 * Nearly 50% of the public API surface of the standard library has
10330 been declared 'stable'. Those interfaces are unlikely to change
10332 * The long-running debate over integer types has been
10333 [settled][ints]: Rust will ship with types named `isize` and
10334 `usize`, rather than `int` and `uint`, for pointer-sized
10335 integers. Guidelines will be rolled out during the alpha cycle.
10336 * Most crates that are not `std` have been moved out of the Rust
10337 distribution into the Cargo ecosystem so they can evolve
10338 separately and don't need to be stabilized as quickly, including
10339 'time', 'getopts', 'num', 'regex', and 'term'.
10340 * Documentation continues to be expanded with more API coverage, more
10341 examples, and more in-depth explanations. The guides have been
10342 consolidated into [The Rust Programming Language][trpl].
10343 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10344 * All official Rust binary installers now come with [Cargo], the
10345 Rust package manager.
10349 * Closures have been [completely redesigned][unboxed] to be
10350 implemented in terms of traits, can now be used as generic type
10351 bounds and thus monomorphized and inlined, or via an opaque
10352 pointer (boxed) as in the old system. The new system is often
10353 referred to as 'unboxed' closures.
10354 * Traits now support [associated types][assoc], allowing families
10355 of related types to be defined together and used generically in
10357 * Enum variants are [namespaced by their type names][enum].
10358 * [`where` clauses][where] provide a more versatile and attractive
10359 syntax for specifying generic bounds, though the previous syntax
10361 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10363 * Rust [no longer has a runtime][rt] of any description, and only
10364 supports OS threads, not green threads.
10365 * At long last, Rust has been overhauled for 'dynamically-sized
10366 types' ([DST]), which integrates 'fat pointers' (object types,
10367 arrays, and `str`) more deeply into the type system, making it
10369 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10370 `..j` that produce range types and which, when combined with the
10371 `Index` operator and multidispatch, leads to a convenient slice
10372 notation, `[i..j]`.
10373 * The new range syntax revealed an ambiguity in the fixed-length
10374 array syntax, so now fixed length arrays [are written `[T;
10376 * The `Copy` trait is no longer implemented automatically. Unsafe
10377 pointers no longer implement `Sync` and `Send` so types
10378 containing them don't automatically either. `Sync` and `Send`
10379 are now 'unsafe traits' so one can "forcibly" implement them via
10380 `unsafe impl` if a type confirms to the requirements for them
10381 even though the internals do not (e.g. structs containing unsafe
10382 pointers like `Arc`). These changes are intended to prevent some
10383 footguns and are collectively known as [opt-in built-in
10384 traits][oibit] (though `Sync` and `Send` will soon become pure
10385 library types unknown to the compiler).
10386 * Operator traits now take their operands [by value][ops], and
10387 comparison traits can use multidispatch to compare one type
10388 against multiple other types, allowing e.g. `String` to be
10389 compared with `&str`.
10390 * `if let` and `while let` are no longer feature-gated.
10391 * Rust has adopted a more [uniform syntax for escaping unicode
10392 characters][unicode].
10393 * `macro_rules!` [has been declared stable][mac]. Though it is a
10394 flawed system it is sufficiently popular that it must be usable
10395 for 1.0. Effort has gone into [future-proofing][mac-future] it
10396 in ways that will allow other macro systems to be developed in
10397 parallel, and won't otherwise impact the evolution of the
10399 * The prelude has been [pared back significantly][prelude] such
10400 that it is the minimum necessary to support the most pervasive
10401 code patterns, and through [generalized where clauses][where]
10402 many of the prelude extension traits have been consolidated.
10403 * Rust's rudimentary reflection [has been removed][refl], as it
10404 incurred too much code generation for little benefit.
10405 * [Struct variants][structvars] are no longer feature-gated.
10406 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10407 known as 'higher-ranked trait bounds', this crucially allows
10408 unboxed closures to work.
10409 * Macros invocations surrounded by parens or square brackets and
10410 not terminated by a semicolon are [parsed as
10411 expressions][macros], which makes expressions like `vec![1i32,
10412 2, 3].len()` work as expected.
10413 * Trait objects now implement their traits automatically, and
10414 traits that can be coerced to objects now must be [object
10416 * Automatically deriving traits is now done with `#[derive(...)]`
10417 not `#[deriving(...)]` for [consistency with other naming
10418 conventions][derive].
10419 * Importing the containing module or enum at the same time as
10420 items or variants they contain is [now done with `self` instead
10421 of `mod`][self], as in use `foo::{self, bar}`
10422 * Glob imports are no longer feature-gated.
10423 * The `box` operator and `box` patterns have been feature-gated
10424 pending a redesign. For now unique boxes should be allocated
10425 like other containers, with `Box::new`.
10429 * A [series][coll1] of [efforts][coll2] to establish
10430 [conventions][coll3] for collections types has resulted in API
10431 improvements throughout the standard library.
10432 * New [APIs for error handling][err] provide ergonomic interop
10433 between error types, and [new conventions][err-conv] describe
10434 more clearly the recommended error handling strategies in Rust.
10435 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10436 it is easier to discuss failure in the context of error handling
10437 without making clarifications as to whether you are referring to
10438 the 'fail' macro or failure more generally.
10439 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10440 syscall when available.
10441 * The 'serialize' crate has been renamed 'rustc-serialize' and
10442 moved out of the distribution to Cargo. Although it is widely
10443 used now, it is expected to be superseded in the near future.
10444 * The `Show` formatter, typically implemented with
10445 `#[derive(Show)]` is [now requested with the `{:?}`
10446 specifier][show] and is intended for use by all types, for uses
10447 such as `println!` debugging. The new `String` formatter must be
10448 implemented by hand, uses the `{}` specifier, and is intended
10449 for full-fidelity conversions of things that can logically be
10450 represented as strings.
10454 * [Flexible target specification][flex] allows rustc's code
10455 generation to be configured to support otherwise-unsupported
10457 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10458 respective debuggers with Rust-appropriate pretty-printing.
10459 * The Windows installation of Rust is distributed with the
10460 MinGW components currently required to link binaries on that
10465 * Nullable enum optimizations have been extended to more types so
10466 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10467 space than the inner types themselves.
10468 * Work has begun on supporting AArch64.
10470 [Cargo]: https://crates.io
10471 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10472 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10473 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10474 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10475 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10476 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10477 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10478 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10479 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10480 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10481 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10482 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10483 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10484 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10485 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10486 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10487 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10488 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10489 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10490 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10491 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10492 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10493 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10494 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10495 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10496 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10497 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10498 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10499 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10500 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10501 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10502 [trpl]: https://doc.rust-lang.org/book/index.html
10503 [rbe]: http://rustbyexample.com/
10506 Version 0.12.0 (2014-10-09)
10507 =============================
10509 * ~1900 changes, numerous bugfixes
10513 * The introductory documentation (now called The Rust Guide) has
10514 been completely rewritten, as have a number of supplementary
10516 * Rust's package manager, Cargo, continues to improve and is
10517 sometimes considered to be quite awesome.
10518 * Many API's in `std` have been reviewed and updated for
10519 consistency with the in-development Rust coding
10520 guidelines. The standard library documentation tracks
10521 stabilization progress.
10522 * Minor libraries have been moved out-of-tree to the rust-lang org
10523 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10524 be installed with Cargo.
10525 * Lifetime elision allows lifetime annotations to be left off of
10526 function declarations in many common scenarios.
10527 * Rust now works on 64-bit Windows.
10530 * Indexing can be overloaded with the `Index` and `IndexMut`
10532 * The `if let` construct takes a branch only if the `let` pattern
10533 matches, currently behind the 'if_let' feature gate.
10534 * 'where clauses', a more flexible syntax for specifying trait
10535 bounds that is more aesthetic, have been added for traits and
10536 free functions. Where clauses will in the future make it
10537 possible to constrain associated types, which would be
10538 impossible with the existing syntax.
10539 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10540 the 'slicing_syntax' feature gate, and can be overloaded with
10541 the `Slice` or `SliceMut` traits.
10542 * The syntax for matching of sub-slices has been changed to use a
10543 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10544 consistency with other uses of `..` and to future-proof
10545 potential additional uses of the syntax.
10546 * The syntax for matching inclusive ranges in patterns has changed
10547 from `0..3` to `0...4` to be consistent with the exclusive range
10548 syntax for slicing.
10549 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10550 c]`) has been put behind the 'advanced_slice_patterns' feature
10551 gate and may be removed in the future.
10552 * Components of tuples and tuple structs can be extracted using
10553 the `value.0` syntax, currently behind the `tuple_indexing`
10555 * The `#[crate_id]` attribute is no longer supported; versioning
10556 is handled by the package manager.
10557 * Renaming crate imports are now written `extern crate foo as bar`
10558 instead of `extern crate bar = foo`.
10559 * Renaming use statements are now written `use foo as bar` instead
10560 of `use bar = foo`.
10561 * `let` and `match` bindings and argument names in macros are now
10563 * The new, more efficient, closure types ('unboxed closures') have
10564 been added under a feature gate, 'unboxed_closures'. These will
10565 soon replace the existing closure types, once higher-ranked
10566 trait lifetimes are added to the language.
10567 * `move` has been added as a keyword, for indicating closures
10568 that capture by value.
10569 * Mutation and assignment is no longer allowed in pattern guards.
10570 * Generic structs and enums can now have trait bounds.
10571 * The `Share` trait is now called `Sync` to free up the term
10572 'shared' to refer to 'shared reference' (the default reference
10574 * Dynamically-sized types have been mostly implemented,
10575 unifying the behavior of fat-pointer types with the rest of the
10577 * As part of dynamically-sized types, the `Sized` trait has been
10578 introduced, which qualifying types implement by default, and
10579 which type parameters expect by default. To specify that a type
10580 parameter does not need to be sized, write `<Sized? T>`. Most
10581 types are `Sized`, notable exceptions being unsized arrays
10582 (`[T]`) and trait types.
10583 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10584 * Lifetime bounds can now be applied to type parameters and object
10586 * The old, reference counted GC type, `Gc<T>` which was once
10587 denoted by the `@` sigil, has finally been removed. GC will be
10588 revisited in the future.
10591 * Library documentation has been improved for a number of modules.
10592 * Bit-vectors, collections::bitv has been modernized.
10593 * The url crate is deprecated in favor of
10594 http://github.com/servo/rust-url, which can be installed with
10596 * Most I/O stream types can be cloned and subsequently closed from
10597 a different thread.
10598 * A `std::time::Duration` type has been added for use in I/O
10599 methods that rely on timers, as well as in the 'time' crate's
10600 `Timespec` arithmetic.
10601 * The runtime I/O abstraction layer that enabled the green thread
10602 scheduler to do non-thread-blocking I/O has been removed, along
10603 with the libuv-based implementation employed by the green thread
10604 scheduler. This will greatly simplify the future I/O work.
10605 * `collections::btree` has been rewritten to have a more
10606 idiomatic and efficient design.
10609 * rustdoc output now indicates the stability levels of API's.
10610 * The `--crate-name` flag can specify the name of the crate
10611 being compiled, like `#[crate_name]`.
10612 * The `-C metadata` specifies additional metadata to hash into
10613 symbol names, and `-C extra-filename` specifies additional
10614 information to put into the output filename, for use by the
10615 package manager for versioning.
10616 * debug info generation has continued to improve and should be
10617 more reliable under both gdb and lldb.
10618 * rustc has experimental support for compiling in parallel
10619 using the `-C codegen-units` flag.
10620 * rustc no longer encodes rpath information into binaries by
10624 * Stack usage has been optimized with LLVM lifetime annotations.
10625 * Official Rust binaries on Linux are more compatible with older
10626 kernels and distributions, built on CentOS 5.10.
10629 Version 0.11.0 (2014-07-02)
10630 ==========================
10632 * ~1700 changes, numerous bugfixes
10635 * ~[T] has been removed from the language. This type is superseded by
10637 * ~str has been removed from the language. This type is superseded by
10639 * ~T has been removed from the language. This type is superseded by the
10641 * @T has been removed from the language. This type is superseded by the
10642 standard library's std::gc::Gc<T> type.
10643 * Struct fields are now all private by default.
10644 * Vector indices and shift amounts are both required to be a `uint`
10645 instead of any integral type.
10646 * Byte character, byte string, and raw byte string literals are now all
10647 supported by prefixing the normal literal with a `b`.
10648 * Multiple ABIs are no longer allowed in an ABI string
10649 * The syntax for lifetimes on closures/procedures has been tweaked
10650 slightly: `<'a>|A, B|: 'b + K -> T`
10651 * Floating point modulus has been removed from the language; however it
10652 is still provided by a library implementation.
10653 * Private enum variants are now disallowed.
10654 * The `priv` keyword has been removed from the language.
10655 * A closure can no longer be invoked through a &-pointer.
10656 * The `use foo, bar, baz;` syntax has been removed from the language.
10657 * The transmute intrinsic no longer works on type parameters.
10658 * Statics now allow blocks/items in their definition.
10659 * Trait bounds are separated from objects with + instead of : now.
10660 * Objects can no longer be read while they are mutably borrowed.
10661 * The address of a static is now marked as insignificant unless the
10662 #[inline(never)] attribute is placed it.
10663 * The #[unsafe_destructor] attribute is now behind a feature gate.
10664 * Struct literals are no longer allowed in ambiguous positions such as
10665 if, while, match, and for..in.
10666 * Declaration of lang items and intrinsics are now feature-gated by
10668 * Integral literals no longer default to `int`, and floating point
10669 literals no longer default to `f64`. Literals must be suffixed with an
10670 appropriate type if inference cannot determine the type of the
10672 * The Box<T> type is no longer implicitly borrowed to &mut T.
10673 * Procedures are now required to not capture borrowed references.
10676 * The standard library is now a "facade" over a number of underlying
10677 libraries. This means that development on the standard library should
10678 be speedier due to smaller crates, as well as a clearer line between
10680 * A new library, libcore, lives under the standard library's facade
10681 which is Rust's "0-assumption" library, suitable for embedded and
10682 kernel development for example.
10683 * A regex crate has been added to the standard distribution. This crate
10684 includes statically compiled regular expressions.
10685 * The unwrap/unwrap_err methods on Result require a Show bound for
10686 better error messages.
10687 * The return types of the std::comm primitives have been centralized
10688 around the Result type.
10689 * A number of I/O primitives have gained the ability to time out their
10691 * A number of I/O primitives have gained the ability to close their
10692 reading/writing halves to cancel pending operations.
10693 * Reverse iterator methods have been removed in favor of `rev()` on
10694 their forward-iteration counterparts.
10695 * A bitflags! macro has been added to enable easy interop with C and
10696 management of bit flags.
10697 * A debug_assert! macro is now provided which is disabled when
10698 `--cfg ndebug` is passed to the compiler.
10699 * A graphviz crate has been added for creating .dot files.
10700 * The std::cast module has been migrated into std::mem.
10701 * The std::local_data api has been migrated from freestanding functions
10702 to being based on methods.
10703 * The Pod trait has been renamed to Copy.
10704 * jemalloc has been added as the default allocator for types.
10705 * The API for allocating memory has been changed to use proper alignment
10706 and sized deallocation
10707 * Connecting a TcpStream or binding a TcpListener is now based on a
10708 string address and a u16 port. This allows connecting to a hostname as
10710 * The Reader trait now contains a core method, read_at_least(), which
10711 correctly handles many repeated 0-length reads.
10712 * The process-spawning API is now centered around a builder-style
10714 * The :? printing qualifier has been moved from the standard library to
10715 an external libdebug crate.
10716 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10717 have been renamed to Eq/Ord.
10718 * The select/plural methods have been removed from format!. The escapes
10719 for { and } have also changed from \{ and \} to {{ and }},
10721 * The TaskBuilder API has been re-worked to be a true builder, and
10722 extension traits for spawning native/green tasks have been added.
10725 * All breaking changes to the language or libraries now have their
10726 commit message annotated with `[breaking-change]` to allow for easy
10727 discovery of breaking changes.
10728 * The compiler will now try to suggest how to annotate lifetimes if a
10729 lifetime-related error occurs.
10730 * Debug info continues to be improved greatly with general bug fixes and
10731 better support for situations like link time optimization (LTO).
10732 * Usage of syntax extensions when cross-compiling has been fixed.
10733 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10734 -fdata-sections and --gc-sections has been enabled by default
10735 * The compiler is now stricter about where it will load module files
10736 from when a module is declared via `mod foo;`.
10737 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10738 Syntax extensions are now discovered via a "plugin registrar" type
10739 which will be extended in the future to other various plugins.
10740 * Lints have been restructured to allow for dynamically loadable lints.
10741 * A number of rustdoc improvements:
10742 * The HTML output has been visually redesigned.
10743 * Markdown is now powered by hoedown instead of sundown.
10744 * Searching heuristics have been greatly improved.
10745 * The search index has been reduced in size by a great amount.
10746 * Cross-crate documentation via `pub use` has been greatly improved.
10747 * Primitive types are now hyperlinked and documented.
10748 * Documentation has been moved from static.rust-lang.org/doc to
10750 * A new sandbox, play.rust-lang.org, is available for running and
10751 sharing rust code examples on-line.
10752 * Unused attributes are now more robustly warned about.
10753 * The dead_code lint now warns about unused struct fields.
10754 * Cross-compiling to iOS is now supported.
10755 * Cross-compiling to mipsel is now supported.
10756 * Stability attributes are now inherited by default and no longer apply
10757 to intra-crate usage, only inter-crate usage.
10758 * Error message related to non-exhaustive match expressions have been
10762 Version 0.10 (2014-04-03)
10763 =========================
10765 * ~1500 changes, numerous bugfixes
10768 * A new RFC process is now in place for modifying the language.
10769 * Patterns with `@`-pointers have been removed from the language.
10770 * Patterns with unique vectors (`~[T]`) have been removed from the
10772 * Patterns with unique strings (`~str`) have been removed from the
10774 * `@str` has been removed from the language.
10775 * `@[T]` has been removed from the language.
10776 * `@self` has been removed from the language.
10777 * `@Trait` has been removed from the language.
10778 * Headers on `~` allocations which contain `@` boxes inside the type for
10779 reference counting have been removed.
10780 * The semantics around the lifetimes of temporary expressions have changed,
10781 see #3511 and #11585 for more information.
10782 * Cross-crate syntax extensions are now possible, but feature gated. See
10783 #11151 for more information. This includes both `macro_rules!` macros as
10784 well as syntax extensions such as `format!`.
10785 * New lint modes have been added, and older ones have been turned on to be
10787 * Unnecessary parentheses
10788 * Uppercase statics
10790 * Uppercase variables
10791 * Publicly visible private types
10792 * `#[deriving]` with raw pointers
10793 * Unsafe functions can no longer be coerced to closures.
10794 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10795 * The `#[simd]` attribute is now behind a feature gate.
10796 * Visibility is no longer allowed on `extern crate` statements, and
10797 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10798 * Trailing commas are now allowed in argument lists and tuple patterns.
10799 * The `do` keyword has been removed, it is now a reserved keyword.
10800 * Default type parameters have been implemented, but are feature gated.
10801 * Borrowed variables through captures in closures are now considered soundly.
10802 * `extern mod` is now `extern crate`
10803 * The `Freeze` trait has been removed.
10804 * The `Share` trait has been added for types that can be shared among
10806 * Labels in macros are now hygienic.
10807 * Expression/statement macro invocations can be delimited with `{}` now.
10808 * Treatment of types allowed in `static mut` locations has been tweaked.
10809 * The `*` and `.` operators are now overloadable through the `Deref` and
10811 * `~Trait` and `proc` no longer have `Send` bounds by default.
10812 * Partial type hints are now supported with the `_` type marker.
10813 * An `Unsafe` type was introduced for interior mutability. It is now
10814 considered undefined to transmute from `&T` to `&mut T` without using the
10816 * The #[linkage] attribute was implemented for extern statics/functions.
10817 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10818 * `Pod` was renamed to `Copy`.
10821 * The `libextra` library has been removed. It has now been decomposed into
10822 component libraries with smaller and more focused nuggets of
10823 functionality. The full list of libraries can be found on the
10824 documentation index page.
10825 * std: `std::condition` has been removed. All I/O errors are now propagated
10826 through the `Result` type. In order to assist with error handling, a
10827 `try!` macro for unwrapping errors with an early return and a lint for
10828 unused results has been added. See #12039 for more information.
10829 * std: The `vec` module has been renamed to `slice`.
10830 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10831 This will become the only growable vector in the future.
10832 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10833 are now found at `std::io::BufferedReader` instead of
10834 `std::io::buffered::BufferedReader`.
10835 * std: `print` and `println` are no longer in the prelude, the `print!` and
10836 `println!` macros are intended to be used instead.
10837 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10838 attempts to statically prevent cycles.
10839 * std: The standard distribution is adopting the policy of pushing failure
10840 to the user rather than failing in libraries. Many functions (such as
10841 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10842 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10843 deriving mode: `#[deriving(Show)]`.
10844 * std: `ToStr` is now implemented for all types implementing `Show`.
10845 * std: The formatting trait methods now take `&self` instead of `&T`
10846 * std: The `invert()` method on iterators has been renamed to `rev()`
10847 * std: `std::num` has seen a reduction in the genericity of its traits,
10848 consolidating functionality into a few core traits.
10849 * std: Backtraces are now printed on task failure if the environment
10850 variable `RUST_BACKTRACE` is present.
10851 * std: Naming conventions for iterators have been standardized. More details
10852 can be found on the wiki's style guide.
10853 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10854 still implement the function.
10855 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10856 * std: `assert_approx_eq!` has been removed
10857 * std: The `e` and `E` formatting specifiers for floats have been added to
10858 print them in exponential notation.
10859 * std: The `Times` trait has been removed
10860 * std: Indications of variance and opting out of builtin bounds is done
10861 through marker types in `std::kinds::marker` now
10862 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10863 `#[deriving(Hash)]` is now possible.
10864 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10865 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10866 * std: `Chan::new` is now `channel()`.
10867 * std: A new synchronous channel type has been implemented.
10868 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10869 * std: `hashmap` and `trie` have been moved to `libcollections`
10870 * std: `run` has been rolled into `io::process`
10871 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10872 * std: The equality and comparison traits have seen some reorganization.
10873 * std: `rand` has moved to `librand`.
10874 * std: `to_{lower,upper}case` has been implemented for `char`.
10875 * std: Logging has been moved to `liblog`.
10876 * collections: `HashMap` has been rewritten for higher performance and less
10878 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10879 it can be booted manually. The runtime guide has more information and
10881 * native: All I/O functionality except signals has been implemented.
10882 * green: Task spawning with `libgreen` has been optimized with stack caching
10883 and various trimming of code.
10884 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10885 * sync: The `extra::sync` module has been updated to modern rust (and moved
10886 to the `sync` library), tweaking and improving various interfaces while
10887 dropping redundant functionality.
10888 * sync: A new `Barrier` type has been added to the `sync` library.
10889 * sync: An efficient mutex for native and green tasks has been implemented.
10890 * serialize: The `base64` module has seen some improvement. It treats
10891 newlines better, has non-string error values, and has seen general
10893 * fourcc: A `fourcc!` macro was introduced
10894 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10895 hexadecimal literal.
10898 * `rustpkg` has been deprecated and removed from the main repository. Its
10899 replacement, `cargo`, is under development.
10900 * Nightly builds of rust are now available
10901 * The memory usage of rustc has been improved many times throughout this
10903 * The build process supports disabling rpath support for the rustc binary
10905 * Code generation has improved in some cases, giving more information to the
10906 LLVM optimization passes to enable more extensive optimizations.
10907 * Debuginfo compatibility with lldb on OSX has been restored.
10908 * The master branch is now gated on an android bot, making building for
10909 android much more reliable.
10910 * Output flags have been centralized into one `--emit` flag.
10911 * Crate type flags have been centralized into one `--crate-type` flag.
10912 * Codegen flags have been consolidated behind a `-C` flag.
10913 * Linking against outdated crates now has improved error messages.
10914 * Error messages with lifetimes will often suggest how to annotate the
10915 function to fix the error.
10916 * Many more types are documented in the standard library, and new guides
10918 * Many `rustdoc` improvements:
10919 * code blocks are syntax highlighted.
10920 * render standalone markdown files.
10921 * the --test flag tests all code blocks by default.
10922 * exported macros are displayed.
10923 * re-exported types have their documentation inlined at the location of the
10925 * search works across crates that have been rendered to the same output
10929 Version 0.9 (2014-01-09)
10930 ==========================
10932 * ~1800 changes, numerous bugfixes
10935 * The `float` type has been removed. Use `f32` or `f64` instead.
10936 * A new facility for enabling experimental features (feature gating) has
10937 been added, using the crate-level `#[feature(foo)]` attribute.
10938 * Managed boxes (@) are now behind a feature gate
10939 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10940 standard library's `Gc` or `Rc` types instead.
10941 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10942 * Jumping back to the top of a loop is now done with `continue` instead of
10944 * Strings can no longer be mutated through index assignment.
10945 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10946 hash delimiters, as in `r###"foo"###`.
10947 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10949 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10950 * `@fn`s have been removed.
10951 * `do` only works with procs in order to make it obvious what the cost
10953 * Single-element tuple-like structs can no longer be dereferenced to
10954 obtain the inner value. A more comprehensive solution for overloading
10955 the dereference operator will be provided in the future.
10956 * The `#[link(...)]` attribute has been replaced with
10957 `#[crate_id = "name#vers"]`.
10958 * Empty `impl`s must be terminated with empty braces and may not be
10959 terminated with a semicolon.
10960 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10961 no longer has any special meaning.
10962 * The old `fmt!` string formatting macro has been removed.
10963 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10964 `print!` and `println!`.
10965 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10966 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10967 `extern mod foo = "bar"` instead.
10968 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10969 * Macros can have attributes.
10970 * Macros can expand to items with attributes.
10971 * Macros can expand to multiple items.
10972 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10973 * Comments may be nested.
10974 * Values automatically coerce to trait objects they implement, without
10976 * Enum discriminants are no longer an entire word but as small as needed to
10977 contain all the variants. The `repr` attribute can be used to override
10978 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10979 `#[repr(C)]` to match C enums.
10980 * Non-string literals are not allowed in attributes (they never worked).
10981 * The FFI now supports variadic functions.
10982 * Octal numeric literals, as in `0o7777`.
10983 * The `concat!` syntax extension performs compile-time string concatenation.
10984 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10985 removed as Rust no longer uses segmented stacks.
10986 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10987 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10988 not `*`; ignoring remaining fields of a struct is also done with `..`,
10989 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10990 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10991 * `rustc` supports the "system" calling convention, which defaults to the
10992 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10994 * The `type_overflow` lint (default: warn) checks literals for overflow.
10995 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10996 * The `attribute_usage` lint (default: warn) warns about unknown
10998 * The `unknown_features` lint (default: warn) warns about unknown
11000 * The `dead_code` lint (default: warn) checks for dead code.
11001 * Rust libraries can be linked statically to one another
11002 * `#[link_args]` is behind the `link_args` feature gate.
11003 * Native libraries are now linked with `#[link(name = "foo")]`
11004 * Native libraries can be statically linked to a rust crate
11005 (`#[link(name = "foo", kind = "static")]`).
11006 * Native OS X frameworks are now officially supported
11007 (`#[link(name = "foo", kind = "framework")]`).
11008 * The `#[thread_local]` attribute creates thread-local (not task-local)
11009 variables. Currently behind the `thread_local` feature gate.
11010 * The `return` keyword may be used in closures.
11011 * Types that can be copied via a memcpy implement the `Pod` kind.
11012 * The `cfg` attribute can now be used on struct fields and enum variants.
11015 * std: The `option` and `result` API's have been overhauled to make them
11016 simpler, more consistent, and more composable.
11017 * std: The entire `std::io` module has been replaced with one that is
11018 more comprehensive and that properly interfaces with the underlying
11019 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
11021 * std: `io::util` contains a number of useful implementations of
11022 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
11023 `ZeroReader`, `TeeReader`.
11024 * std: The reference counted pointer type `extra::rc` moved into std.
11025 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
11026 just a wrapper around it).
11027 * std: The `Either` type has been removed.
11028 * std: `fmt::Default` can be implemented for any type to provide default
11029 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
11030 * std: The `rand` API continues to be tweaked.
11031 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
11032 on failure in gdb, is now named `rust_fail`.
11033 * std: The `each_key` and `each_value` methods on `HashMap` have been
11034 replaced by the `keys` and `values` iterators.
11035 * std: Functions dealing with type size and alignment have moved from the
11036 `sys` module to the `mem` module.
11037 * std: The `path` module was written and API changed.
11038 * std: `str::from_utf8` has been changed to cast instead of allocate.
11039 * std: `starts_with` and `ends_with` methods added to vectors via the
11040 `ImmutableEqVector` trait, which is in the prelude.
11041 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
11042 if the index is out of bounds.
11043 * std: Task failure no longer propagates between tasks, as the model was
11044 complex, expensive, and incompatible with thread-based tasks.
11045 * std: The `Any` type can be used for dynamic typing.
11046 * std: `~Any` can be passed to the `fail!` macro and retrieved via
11048 * std: Methods that produce iterators generally do not have an `_iter`
11050 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
11051 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
11052 * std: `util::ignore` renamed to `prelude::drop`.
11053 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
11055 * std: `vec::raw` has seen a lot of cleanup and API changes.
11056 * std: The standard library no longer includes any C++ code, and very
11057 minimal C, eliminating the dependency on libstdc++.
11058 * std: Runtime scheduling and I/O functionality has been factored out into
11059 extensible interfaces and is now implemented by two different crates:
11060 libnative, for native threading and I/O; and libgreen, for green threading
11061 and I/O. This paves the way for using the standard library in more limited
11062 embedded environments.
11063 * std: The `comm` module has been rewritten to be much faster, have a
11064 simpler, more consistent API, and to work for both native and green
11066 * std: All libuv dependencies have been moved into the rustuv crate.
11067 * native: New implementations of runtime scheduling on top of OS threads.
11068 * native: New native implementations of TCP, UDP, file I/O, process spawning,
11070 * green: The green thread scheduler and message passing types are almost
11071 entirely lock-free.
11072 * extra: The `flatpipes` module had bitrotted and was removed.
11073 * extra: All crypto functions have been removed and Rust now has a policy of
11074 not reimplementing crypto in the standard library. In the future crypto
11075 will be provided by external crates with bindings to established libraries.
11076 * extra: `c_vec` has been modernized.
11077 * extra: The `sort` module has been removed. Use the `sort` method on
11081 * The `rust` and `rusti` commands have been removed, due to lack of
11083 * `rustdoc` was completely rewritten.
11084 * `rustdoc` can test code examples in documentation.
11085 * `rustpkg` can test packages with the argument, 'test'.
11086 * `rustpkg` supports arbitrary dependencies, including C libraries.
11087 * `rustc`'s support for generating debug info is improved again.
11088 * `rustc` has better error reporting for unbalanced delimiters.
11089 * `rustc`'s JIT support was removed due to bitrot.
11090 * Executables and static libraries can be built with LTO (-Z lto)
11091 * `rustc` adds a `--dep-info` flag for communicating dependencies to
11095 Version 0.8 (2013-09-26)
11096 ============================
11098 * ~2200 changes, numerous bugfixes
11101 * The `for` loop syntax has changed to work with the `Iterator` trait.
11102 * At long last, unwinding works on Windows.
11103 * Default methods are ready for use.
11104 * Many trait inheritance bugs fixed.
11105 * Owned and borrowed trait objects work more reliably.
11106 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
11107 * rustc can omit emission of code for the `debug!` macro if it is passed
11109 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
11110 for foo.rs, then foo/mod.rs, and will generate an error when both are
11112 * Strings no longer contain trailing nulls. The new `std::c_str` module
11113 provides new mechanisms for converting to C strings.
11114 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
11115 * The FFI has been overhauled such that foreign functions are called directly,
11116 instead of through a stack-switching wrapper.
11117 * Calling a foreign function must be done through a Rust function with the
11118 `#[fixed_stack_segment]` attribute.
11119 * The `externfn!` macro can be used to declare both a foreign function and
11120 a `#[fixed_stack_segment]` wrapper at once.
11121 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
11122 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
11123 * `priv` is disallowed everywhere except for struct fields and enum variants.
11124 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
11125 * `ref` bindings in irrefutable patterns work correctly now.
11126 * `char` is now prevented from containing invalid code points.
11127 * Casting to `bool` is no longer allowed.
11128 * `\0` is now accepted as an escape in chars and strings.
11129 * `yield` is a reserved keyword.
11130 * `typeof` is a reserved keyword.
11131 * Crates may be imported by URL with `extern mod foo = "url";`.
11132 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
11133 * Static vectors can be initialized with repeating elements,
11134 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
11135 * Static structs can be initialized with functional record update,
11136 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
11137 * `cfg!` can be used to conditionally execute code based on the crate
11138 configuration, similarly to `#[cfg(...)]`.
11139 * The `unnecessary_qualification` lint detects unneeded module
11140 prefixes (default: allow).
11141 * Arithmetic operations have been implemented on the SIMD types in
11142 `std::unstable::simd`.
11143 * Exchange allocation headers were removed, reducing memory usage.
11144 * `format!` implements a completely new, extensible, and higher-performance
11145 string formatting system. It will replace `fmt!`.
11146 * `print!` and `println!` write formatted strings (using the `format!`
11147 extension) to stdout.
11148 * `write!` and `writeln!` write formatted strings (using the `format!`
11149 extension) to the new Writers in `std::rt::io`.
11150 * The library section in which a function or static is placed may
11151 be specified with `#[link_section = "..."]`.
11152 * The `proto!` syntax extension for defining bounded message protocols
11154 * `macro_rules!` is hygienic for `let` declarations.
11155 * The `#[export_name]` attribute specifies the name of a symbol.
11156 * `unreachable!` can be used to indicate unreachable code, and fails
11160 * std: Transitioned to the new runtime, written in Rust.
11161 * std: Added an experimental I/O library, `rt::io`, based on the new
11163 * std: A new generic `range` function was added to the prelude, replacing
11164 `uint::range` and friends.
11165 * std: `range_rev` no longer exists. Since range is an iterator it can be
11166 reversed with `range(lo, hi).invert()`.
11167 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
11168 renamed to `unwrap_or`.
11169 * std: The `iterator` module was renamed to `iter`.
11170 * std: Integral types now support the `checked_add`, `checked_sub`, and
11171 `checked_mul` operations for detecting overflow.
11172 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
11174 * std: Methods are standardizing on conventions for casting methods:
11175 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
11177 * std: The `CString` type in `c_str` provides new ways to convert to and
11179 * std: `DoubleEndedIterator` can yield elements in two directions.
11180 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
11182 * std: `str::from_bytes` renamed to `str::from_utf8`.
11183 * std: `pop_opt` and `shift_opt` methods added to vectors.
11184 * std: The task-local data interface no longer uses @, and keys are
11185 no longer function pointers.
11186 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
11187 * std: Added `SharedPort` to `comm`.
11188 * std: `Eq` has a default method for `ne`; only `eq` is required
11189 in implementations.
11190 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11191 is required in implementations.
11192 * std: `is_utf8` performance is improved, impacting many string functions.
11193 * std: `os::MemoryMap` provides cross-platform mmap.
11194 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11195 are not 'in-bounds' are considered undefined.
11196 * std: Many freestanding functions in `vec` removed in favor of methods.
11197 * std: Many freestanding functions on scalar types removed in favor of
11199 * std: Many options to task builders were removed since they don't make
11200 sense in the new scheduler design.
11201 * std: More containers implement `FromIterator` so can be created by the
11203 * std: More complete atomic types in `unstable::atomics`.
11204 * std: `comm::PortSet` removed.
11205 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11206 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11207 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11208 default implementations.
11209 * std: Various `from_str` functions were removed in favor of a generic
11210 `from_str` which is available in the prelude.
11211 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11212 * extra: `dlist`, the doubly-linked list was modernized.
11213 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11214 * extra: Added `glob` module, replacing `std::os::glob`.
11215 * extra: `rope` was removed.
11216 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11217 * extra: `net`, and `timer` were removed. The experimental replacements
11218 are `std::rt::io::net` and `std::rt::io::timer`.
11219 * extra: Iterators implemented for `SmallIntMap`.
11220 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11221 * extra: `SmallIntSet` removed. Use `BitvSet`.
11222 * extra: Performance of JSON parsing greatly improved.
11223 * extra: `semver` updated to SemVer 2.0.0.
11224 * extra: `term` handles more terminals correctly.
11225 * extra: `dbg` module removed.
11226 * extra: `par` module removed.
11227 * extra: `future` was cleaned up, with some method renames.
11228 * extra: Most free functions in `getopts` were converted to methods.
11231 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11232 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11233 similarly to gcc's `--march` flag.
11234 * rustc's performance compiling small crates is much better.
11235 * rustpkg has received many improvements.
11236 * rustpkg supports git tags as package IDs.
11237 * rustpkg builds into target-specific directories so it can be used for
11239 * The number of concurrent test tasks is controlled by the environment
11240 variable RUST_TEST_TASKS.
11241 * The test harness can now report metrics for benchmarks.
11242 * All tools have man pages.
11243 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11244 * The runtime uses jemalloc for allocations.
11245 * Segmented stacks are temporarily disabled as part of the transition to
11246 the new runtime. Stack overflows are possible!
11247 * A new documentation backend, rustdoc_ng, is available for use. It is
11248 still invoked through the normal `rustdoc` command.
11251 Version 0.7 (2013-07-03)
11252 =======================
11254 * ~2000 changes, numerous bugfixes
11257 * `impl`s no longer accept a visibility qualifier. Put them on methods
11259 * The borrow checker has been rewritten with flow-sensitivity, fixing
11260 many bugs and inconveniences.
11261 * The `self` parameter no longer implicitly means `&'self self`,
11262 and can be explicitly marked with a lifetime.
11263 * Overloadable compound operators (`+=`, etc.) have been temporarily
11264 removed due to bugs.
11265 * The `for` loop protocol now requires `for`-iterators to return `bool`
11266 so they compose better.
11267 * The `Durable` trait is replaced with the `'static` bounds.
11268 * Trait default methods work more often.
11269 * Structs with the `#[packed]` attribute have byte alignment and
11270 no padding between fields.
11271 * Type parameters bound by `Copy` must now be copied explicitly with
11272 the `copy` keyword.
11273 * It is now illegal to move out of a dereferenced unsafe pointer.
11274 * `Option<~T>` is now represented as a nullable pointer.
11275 * `@mut` does dynamic borrow checks correctly.
11276 * The `main` function is only detected at the topmost level of the crate.
11277 The `#[main]` attribute is still valid anywhere.
11278 * Struct fields may no longer be mutable. Use inherited mutability.
11279 * The `#[no_send]` attribute makes a type that would otherwise be
11281 * The `#[no_freeze]` attribute makes a type that would otherwise be
11283 * Unbounded recursion will abort the process after reaching the limit
11284 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11285 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11286 are never implicitly copyable.
11287 * `#[static_assert]` makes compile-time assertions about static bools.
11288 * At long last, 'argument modes' no longer exist.
11289 * The rarely used `use mod` statement no longer exists.
11291 * Syntax extensions
11292 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11294 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11295 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11296 `#[deriving(...)]`.
11297 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11298 and unsuffixed integer literals.
11301 * The `core` crate was renamed to `std`.
11302 * The `std` crate was renamed to `extra`.
11303 * More and improved documentation.
11304 * std: `iterator` module for external iterator objects.
11305 * Many old-style (internal, higher-order function) iterators replaced by
11306 implementations of `Iterator`.
11307 * std: Many old internal vector and string iterators,
11308 incl. `any`, `all`. removed.
11309 * std: The `finalize` method of `Drop` renamed to `drop`.
11310 * std: The `drop` method now takes `&mut self` instead of `&self`.
11311 * std: The prelude no longer re-exports any modules, only types and traits.
11312 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11313 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11314 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11315 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11316 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11317 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11318 * std: Many types implement `Clone`.
11319 * std: `path` type renamed to `Path`.
11320 * std: `mut` module and `Mut` type removed.
11321 * std: Many standalone functions removed in favor of methods and iterators
11322 in `vec`, `str`. In the future methods will also work as functions.
11323 * std: `reinterpret_cast` removed. Use `transmute`.
11324 * std: ascii string handling in `std::ascii`.
11325 * std: `Rand` is implemented for ~/@.
11326 * std: `run` module for spawning processes overhauled.
11327 * std: Various atomic types added to `unstable::atomic`.
11328 * std: Various types implement `Zero`.
11329 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11330 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11331 * std: Added `os::mkdir_recursive`.
11332 * std: Added `os::glob` function performs filesystems globs.
11333 * std: `FuzzyEq` renamed to `ApproxEq`.
11334 * std: `Map` now defines `pop` and `swap` methods.
11335 * std: `Cell` constructors converted to static methods.
11336 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11337 * extra: `flate` module moved from `std` to `extra`.
11338 * extra: `fileinput` module for iterating over a series of files.
11339 * extra: `Complex` number type and `complex` module.
11340 * extra: `Rational` number type and `rational` module.
11341 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11342 * extra: `term` uses terminfo now, is more correct.
11343 * extra: `arc` functions converted to methods.
11344 * extra: Implementation of fixed output size variations of SHA-2.
11347 * `unused_variables` lint mode for unused variables (default: warn).
11348 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11350 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11352 * `dead_assignment` lint mode for unread variables (default: warn).
11353 * `unnecessary_allocation` lint mode detects some heap allocations that are
11354 immediately borrowed so could be written without allocating (default: warn).
11355 * `missing_doc` lint mode (default: allow).
11356 * `unreachable_code` lint mode (default: warn).
11357 * The `rusti` command has been rewritten and a number of bugs addressed.
11358 * rustc outputs in color on more terminals.
11359 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11360 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11361 * Compiling with `-g` will make the binary record information about
11362 dynamic borrowcheck failures for debugging.
11363 * rustdoc has a nicer stylesheet.
11364 * Various improvements to rustdoc.
11365 * Improvements to rustpkg (see the detailed release notes).
11368 Version 0.6 (2013-04-03)
11369 ========================
11371 * ~2100 changes, numerous bugfixes
11374 * The self type parameter in traits is now spelled `Self`
11375 * The `self` parameter in trait and impl methods must now be explicitly
11376 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11377 * Static methods no longer require the `static` keyword and instead
11378 are distinguished by the lack of a `self` parameter
11379 * Replaced the `Durable` trait with the `'static` lifetime
11380 * The old closure type syntax with the trailing sigil has been
11381 removed in favor of the more consistent leading sigil
11382 * `super` is a keyword, and may be prefixed to paths
11383 * Trait bounds are separated with `+` instead of whitespace
11384 * Traits are implemented with `impl Trait for Type`
11385 instead of `impl Type: Trait`
11386 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11387 * The `export` keyword has finally been removed
11388 * The `move` keyword has been removed (see "Semantic changes")
11389 * The interior mutability qualifier on vectors, `[mut T]`, has been
11390 removed. Use `&mut [T]`, etc.
11391 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11392 * `fail` is no longer a keyword. Use `fail!()`
11393 * `assert` is no longer a keyword. Use `assert!()`
11394 * `log` is no longer a keyword. use `debug!`, etc.
11395 * 1-tuples may be represented as `(T,)`
11396 * Struct fields may no longer be `mut`. Use inherited mutability,
11397 `@mut T`, `core::mut` or `core::cell`
11398 * `extern mod { ... }` is no longer valid syntax for foreign
11399 function modules. Use extern blocks: `extern { ... }`
11400 * Newtype enums removed. Use tuple-structs.
11401 * Trait implementations no longer support visibility modifiers
11402 * Pattern matching over vectors improved and expanded
11403 * `const` renamed to `static` to correspond to lifetime name,
11404 and make room for future `static mut` unsafe mutable globals.
11405 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11406 * `Clone` implementations can be automatically generated with
11407 `#[deriving(Clone)]`
11408 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11409 instead of `foo as Bar`.
11410 * Fixed length vector types are now written as `[int, .. 3]`
11411 instead of `[int * 3]`.
11412 * Fixed length vector types can express the length as a constant
11413 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11416 * Types with owned pointers or custom destructors move by default,
11417 eliminating the `move` keyword
11418 * All foreign functions are considered unsafe
11419 * &mut is now unaliasable
11420 * Writes to borrowed @mut pointers are prevented dynamically
11422 * The name of the main function can be customized using #[main]
11423 * The default type of an inferred closure is &fn instead of @fn
11424 * `use` statements may no longer be "chained" - they cannot import
11425 identifiers imported by previous `use` statements
11426 * `use` statements are crate relative, importing from the "top"
11427 of the crate by default. Paths may be prefixed with `super::`
11428 or `self::` to change the search behavior.
11429 * Method visibility is inherited from the implementation declaration
11430 * Structural records have been removed
11431 * Many more types can be used in static items, including enums
11432 'static-lifetime pointers and vectors
11433 * Pattern matching over vectors improved and expanded
11434 * Typechecking of closure types has been overhauled to
11435 improve inference and eliminate unsoundness
11436 * Macros leave scope at the end of modules, unless that module is
11437 tagged with #[macro_escape]
11440 * Added big integers to `std::bigint`
11441 * Removed `core::oldcomm` module
11442 * Added pipe-based `core::comm` module
11443 * Numeric traits have been reorganized under `core::num`
11444 * `vec::slice` finally returns a slice
11445 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11446 * Containers reorganized around traits in `core::container`
11447 * `core::dvec` removed, `~[T]` is a drop-in replacement
11448 * `core::send_map` renamed to `core::hashmap`
11449 * `std::map` removed; replaced with `core::hashmap`
11450 * `std::treemap` reimplemented as an owned balanced tree
11451 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11452 * `core::trie` added as a fast ordered map for integer keys
11453 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11454 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11455 overload the comparison operators, whereas `TotalOrd` is used
11456 by certain container types
11459 * Replaced the 'cargo' package manager with 'rustpkg'
11460 * Added all-purpose 'rust' tool
11461 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11462 * rustc now *attempts* to offer spelling suggestions
11463 * Improved support for ARM and Android
11464 * Preliminary MIPS backend
11465 * Improved foreign function ABI implementation for x86, x86_64
11466 * Various memory usage improvements
11467 * Rust code may be embedded in foreign code under limited circumstances
11468 * Inline assembler supported by new asm!() syntax extension.
11471 Version 0.5 (2012-12-21)
11472 ===========================
11474 * ~900 changes, numerous bugfixes
11477 * Removed `<-` move operator
11478 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11479 * Removed old fixed length vector syntax - `[T]/N`
11480 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11481 * Macros may now expand to items and statements
11482 * `a.b()` is always parsed as a method call, never as a field projection
11483 * `Eq` and `IterBytes` implementations can be automatically generated
11484 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11485 * Removed the special crate language for `.rc` files
11486 * Function arguments may consist of any irrefutable pattern
11489 * `&` and `~` pointers may point to objects
11490 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11491 * Enum variants may be structs
11492 * Destructors can be added to all nominal types with the Drop trait
11493 * Structs and nullary enum variants may be constants
11494 * Values that cannot be implicitly copied are now automatically moved
11495 without writing `move` explicitly
11496 * `&T` may now be coerced to `*T`
11497 * Coercions happen in `let` statements as well as function calls
11498 * `use` statements now take crate-relative paths
11499 * The module and type namespaces have been merged so that static
11500 method names can be resolved under the trait in which they are
11503 * Improved support for language features
11504 * Trait inheritance works in many scenarios
11505 * More support for explicit self arguments in methods - `self`, `&self`
11506 `@self`, and `~self` all generally work as expected
11507 * Static methods work in more situations
11508 * Experimental: Traits may declare default methods for the implementations
11512 * New condition handling system in `core::condition`
11513 * Timsort added to `std::sort`
11514 * New priority queue, `std::priority_queue`
11515 * Pipes for serializable types, `std::flatpipes'
11516 * Serialization overhauled to be trait-based
11517 * Expanded `getopts` definitions
11518 * Moved futures to `std`
11519 * More functions are pure now
11520 * `core::comm` renamed to `oldcomm`. Still deprecated
11521 * `rustdoc` and `cargo` are libraries now
11524 * Added a preliminary REPL, `rusti`
11525 * License changed from MIT to dual MIT/APL2
11528 Version 0.4 (2012-10-15)
11529 ==========================
11531 * ~2000 changes, numerous bugfixes
11534 * All keywords are now strict and may not be used as identifiers anywhere
11535 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11536 'of', 'with', 'to', 'class'.
11537 * Classes are replaced with simpler structs
11538 * Explicit method self types
11539 * `ret` became `return` and `alt` became `match`
11540 * `import` is now `use`; `use is now `extern mod`
11541 * `extern mod { ... }` is now `extern { ... }`
11542 * `use mod` is the recommended way to import modules
11543 * `pub` and `priv` replace deprecated export lists
11544 * The syntax of `match` pattern arms now uses fat arrow (=>)
11545 * `main` no longer accepts an args vector; use `os::args` instead
11548 * Trait implementations are now coherent, ala Haskell typeclasses
11549 * Trait methods may be static
11550 * Argument modes are deprecated
11551 * Borrowed pointers are much more mature and recommended for use
11552 * Strings and vectors in the static region are stored in constant memory
11553 * Typestate was removed
11554 * Resolution rewritten to be more reliable
11555 * Support for 'dual-mode' data structures (freezing and thawing)
11558 * Most binary operators can now be overloaded via the traits in
11560 * `std::net::url` for representing URLs
11561 * Sendable hash maps in `core::send_map`
11562 * `core::task' gained a (currently unsafe) task-local storage API
11565 * An efficient new intertask communication primitive called the pipe,
11566 along with a number of higher-level channel types, in `core::pipes`
11567 * `std::arc`, an atomically reference counted, immutable, shared memory
11569 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11570 * Futures are now based on pipes and sendable
11571 * More robust linked task failure
11572 * Improved task builder API
11575 * Improved error reporting
11576 * Preliminary JIT support
11577 * Preliminary work on precise GC
11578 * Extensive architectural improvements to rustc
11579 * Begun a transition away from buggy C++-based reflection (shape) code to
11580 Rust-based (visitor) code
11581 * All hash functions and tables converted to secure, randomized SipHash
11584 Version 0.3 (2012-07-12)
11585 ========================
11587 * ~1900 changes, numerous bugfixes
11589 * New coding conveniences
11590 * Integer-literal suffix inference
11591 * Per-item control over warnings, errors
11592 * #[cfg(windows)] and #[cfg(unix)] attributes
11593 * Documentation comments
11594 * More compact closure syntax
11595 * 'do' expressions for treating higher-order functions as
11597 * *-patterns (wildcard extended to all constructor fields)
11600 * Name resolution pass and exhaustiveness checker rewritten
11601 * Region pointers and borrow checking supersede alias
11603 * Init-ness checking is now provided by a region-based liveness
11604 pass instead of the typestate pass; same for last-use analysis
11605 * Extensive work on region pointers
11607 * Experimental new language features
11608 * Slices and fixed-size, interior-allocated vectors
11609 * #!-comments for lang versioning, shell execution
11610 * Destructors and iface implementation for classes;
11611 type-parameterized classes and class methods
11612 * 'const' type kind for types that can be used to implement
11613 shared-memory concurrency patterns
11617 * Removal of various obsolete features
11618 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11619 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11621 * Constructs: do-while loops ('do' repurposed), fn binding,
11622 resources (replaced by destructors)
11624 * Compiler reorganization
11625 * Syntax-layer of compiler split into separate crate
11626 * Clang (from LLVM project) integrated into build
11627 * Typechecker split into sub-modules
11630 * New time functions
11631 * Extension methods for many built-in types
11632 * Arc: atomic-refcount read-only / exclusive-use shared cells
11633 * Par: parallel map and search routines
11634 * Extensive work on libuv interface
11635 * Much vector code moved to libraries
11636 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11637 #include, #include_str, #include_bin
11639 * Tool improvements
11640 * Cargo automatically resolves dependencies
11643 Version 0.2 (2012-03-29)
11644 =========================
11646 * >1500 changes, numerous bugfixes
11648 * New docs and doc tooling
11650 * New port: FreeBSD x86_64
11652 * Compilation model enhancements
11653 * Generics now specialized, multiply instantiated
11654 * Functions now inlined across separate crates
11656 * Scheduling, stack and threading fixes
11657 * Noticeably improved message-passing performance
11658 * Explicit schedulers
11662 * Experimental new language features
11663 * Operator overloading
11667 * Various language extensions
11668 * C-callback function types: 'crust fn ...'
11669 * Infinite-loop construct: 'loop { ... }'
11670 * Shorten 'mutable' to 'mut'
11671 * Required mutable-local qualifier: 'let mut ...'
11672 * Basic glob-exporting: 'export foo::*;'
11673 * Alt now exhaustive, 'alt check' for runtime-checked
11674 * Block-function form of 'for' loop, with 'break' and 'ret'.
11677 * AST quasi-quote syntax extension
11678 * Revived libuv interface
11679 * New modules: core::{future, iter}, std::arena
11680 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11681 * Extensive cleanup, regularization in libstd, libcore
11684 Version 0.1 (2012-01-20)
11685 ===============================
11687 * Most language features work, including:
11688 * Unique pointers, unique closures, move semantics
11689 * Interface-constrained generics
11690 * Static interface dispatch
11692 * Multithread task scheduling
11693 * Typestate predicates
11694 * Failure unwinding, destructors
11695 * Pattern matching and destructuring assignment
11696 * Lightweight block-lambda syntax
11697 * Preliminary macro-by-example
11699 * Compiler works with the following configurations:
11700 * Linux: x86 and x86_64 hosts and targets
11701 * macOS: x86 and x86_64 hosts and targets
11702 * Windows: x86 hosts and targets
11704 * Cross compilation / multi-target configuration supported.
11706 * Preliminary API-documentation and package-management tools included.
11710 * Documentation is incomplete.
11712 * Performance is below intended target.
11714 * Standard library APIs are subject to extensive change, reorganization.
11716 * Language-level versioning is not yet operational - future code will
11717 break unexpectedly.