Rollup merge of #81917 - rust-lang:relnotes-1.51.0, r=Mark-Simulacrum
Update RELEASES.md for 1.51.0 ### [Rendered](https://github.com/rust-lang/rust/blob/relnotes-1.51.0/RELEASES.md) r? `@Mark-Simulacrum` cc `@rust-lang/release`
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Yuki Okushi
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RELEASES.md
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RELEASES.md
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Version 1.51.0 (2021-03-25)
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============================
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Language
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--------
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- [You can now parameterize items such as functions, traits, and `struct`s by constant
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values in addition to by types and lifetimes.][79135] Also known as "const generics"
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E.g. you can now write the following. Note: Only values of primitive integers,
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`bool`, or `char` types are currently permitted.
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```rust
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struct GenericArray<T, const LENGTH: usize> {
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inner: [T; LENGTH]
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}
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impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
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const fn last(&self) -> Option<&T> {
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if LENGTH == 0 {
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None
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} else {
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Some(&self.inner[LENGTH - 1])
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}
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}
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}
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```
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Compiler
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--------
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- [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
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This option controls whether debug information is split across multiple files
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or packed into a single file. **Note** This option is unstable on other platforms.
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- [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
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`aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
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- [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
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- [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
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- [Rust now uses `inline-asm` for stack probes when used with LLVM 11.0.1+][77885]
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\* Refer to Rust's [platform support page][forge-platform-support] for more
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information on Rust's tiered platform support.
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Libraries
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---------
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- [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
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- [`str` now implements `AsMut<str>`.][80279]
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- [`u64` and `u128` now implement `From<char>`.][79502]
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- [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
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- [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
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- [`unsigned_abs` is now implemented for all signed integer types.][80959]
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- [`io::Empty` now implements `io::Seek`.][78044]
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- [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
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`T: ?Sized` types.][80764]
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Stabilized APIs
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---------------
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- [`Arc::decrement_strong_count`]
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- [`Arc::increment_strong_count`]
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- [`Once::call_once_force`]
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- [`Peekable::next_if_eq`]
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- [`Peekable::next_if`]
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- [`Seek::stream_position`]
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- [`array::IntoIter`]
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- [`panic::panic_any`]
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- [`ptr::addr_of!`]
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- [`ptr::addr_of_mut!`]
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- [`slice::fill_with`]
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- [`slice::split_inclusive_mut`]
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- [`slice::split_inclusive`]
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- [`slice::strip_prefix`]
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- [`slice::strip_suffix`]
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- [`str::split_inclusive`]
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- [`sync::OnceState`]
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- [`task::Wake`]
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Cargo
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-----
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- [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
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codegen option.][cargo/9112]
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- [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
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and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
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to avoid unifying features of dependencies where that unification could be unwanted.
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Such as using the same dependency with a `std` feature in a build scripts and
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proc-macros, while using the `no-std` feature in the final binary. See the
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[Cargo book documentation][feature-resolver@2.0] for more information on the feature.
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Rustdoc
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-------
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- [Rustdoc will now include documentation for methods available from `Deref` traits.][80653]
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- [You can now provide a `--default-theme` flag which sets the default theme to use for
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documentation.][79642]
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Various improvements to intra-doc links:
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- [You can link to non-path primitives such as `slice`.][80181]
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- [You can link to associated items.][74489]
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- [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
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Misc
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----
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- [You can now pass `--include-ignored` to tests (e.g. with
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`cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
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Compatibility Notes
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-------------------
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- [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
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- [`rustc` no longer promotes division, modulo and indexing operations to `const` that
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could fail.][80579]
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- [The minimum version of glibc for the following platforms has been bumped to version 2.31
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for the distributed artifacts.][81521]
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- `armv5te-unknown-linux-gnueabi`
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- `sparc64-unknown-linux-gnu`
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- `thumbv7neon-unknown-linux-gnueabihf`
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- `armv7-unknown-linux-gnueabi`
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- `x86_64-unknown-linux-gnux32`
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Internal Only
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-------------
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- [Consistently avoid constructing optimized MIR when not doing codegen][80718]
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[79135]: https://github.com/rust-lang/rust/pull/79135
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[74489]: https://github.com/rust-lang/rust/pull/74489
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[76934]: https://github.com/rust-lang/rust/pull/76934
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[79570]: https://github.com/rust-lang/rust/pull/79570
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[80181]: https://github.com/rust-lang/rust/pull/80181
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[79642]: https://github.com/rust-lang/rust/pull/79642
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[80945]: https://github.com/rust-lang/rust/pull/80945
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[80279]: https://github.com/rust-lang/rust/pull/80279
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[80053]: https://github.com/rust-lang/rust/pull/80053
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[79502]: https://github.com/rust-lang/rust/pull/79502
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[75180]: https://github.com/rust-lang/rust/pull/75180
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[79135]: https://github.com/rust-lang/rust/pull/79135
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[81521]: https://github.com/rust-lang/rust/pull/81521
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[80968]: https://github.com/rust-lang/rust/pull/80968
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[80959]: https://github.com/rust-lang/rust/pull/80959
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[80718]: https://github.com/rust-lang/rust/pull/80718
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[80653]: https://github.com/rust-lang/rust/pull/80653
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[80579]: https://github.com/rust-lang/rust/pull/80579
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[79998]: https://github.com/rust-lang/rust/pull/79998
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[78044]: https://github.com/rust-lang/rust/pull/78044
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[81455]: https://github.com/rust-lang/rust/pull/81455
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[80764]: https://github.com/rust-lang/rust/pull/80764
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[80749]: https://github.com/rust-lang/rust/pull/80749
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[80662]: https://github.com/rust-lang/rust/pull/80662
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[77885]: https://github.com/rust-lang/rust/pull/77885
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[cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
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[cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
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[feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
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[`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
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[`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
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[`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
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[`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
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[`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
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[`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
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[`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
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[`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
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[`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
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[`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
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[`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
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[`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
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[`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
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[`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
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[`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
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[`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
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[`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
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[`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
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Version 1.50.0 (2021-02-11)
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============================
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