backport release notes from master
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Pietro Albini
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1 changed files with 249 additions and 3 deletions
252
RELEASES.md
252
RELEASES.md
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Version 1.50.0 (2021-02-11)
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============================
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Language
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-----------------------
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- [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
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This has been technically possible since 1.38.0, as it was unintentionally stabilized.
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- [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
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Compiler
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-----------------------
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- [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
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- [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
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- [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
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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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- [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
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- [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
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- [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
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This value cannot be a valid file descriptor, and now means `Option<File>` takes
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up the same amount of space as `File`.
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Stabilized APIs
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---------------
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- [`bool::then`]
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- [`btree_map::Entry::or_insert_with_key`]
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- [`f32::clamp`]
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- [`f64::clamp`]
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- [`hash_map::Entry::or_insert_with_key`]
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- [`Ord::clamp`]
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- [`RefCell::take`]
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- [`slice::fill`]
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- [`UnsafeCell::get_mut`]
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The following previously stable methods are now `const`.
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- [`IpAddr::is_ipv4`]
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- [`IpAddr::is_ipv6`]
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- [`Layout::size`]
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- [`Layout::align`]
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- [`Layout::from_size_align`]
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- `pow` for all integer types.
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- `checked_pow` for all integer types.
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- `saturating_pow` for all integer types.
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- `wrapping_pow` for all integer types.
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- `next_power_of_two` for all unsigned integer types.
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- `checked_power_of_two` for all unsigned integer types.
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Cargo
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-----------------------
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- [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
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This option sets a wrapper to execute instead of `rustc`, for workspace members only.
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- [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
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contents of that directory for changes.][cargo/8973]
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- [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
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Misc
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----
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- [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
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- [Running tests will now print the total time taken to execute.][75752]
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Compatibility Notes
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-------------------
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- [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
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recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
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- [Changes in how `TokenStream`s are checked have fixed some cases where you could write
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unhygenic `macro_rules!` macros.][79472]
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- [`#![test]` as an inner attribute is now considered unstable like other inner macro
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attributes, and reports an error by default through the `soft_unstable` lint.][79003]
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- [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
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- [Dropped support for all cloudabi targets.][78439]
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- [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
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recommended to use the `#[panic_handler]` attribute to provide your own implementation.
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- [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
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[74989]: https://github.com/rust-lang/rust/pull/74989
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[79261]: https://github.com/rust-lang/rust/pull/79261
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[79896]: https://github.com/rust-lang/rust/pull/79896
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[79484]: https://github.com/rust-lang/rust/pull/79484
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[79472]: https://github.com/rust-lang/rust/pull/79472
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[79270]: https://github.com/rust-lang/rust/pull/79270
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[79003]: https://github.com/rust-lang/rust/pull/79003
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[78864]: https://github.com/rust-lang/rust/pull/78864
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[78636]: https://github.com/rust-lang/rust/pull/78636
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[78439]: https://github.com/rust-lang/rust/pull/78439
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[78343]: https://github.com/rust-lang/rust/pull/78343
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[78296]: https://github.com/rust-lang/rust/pull/78296
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[78068]: https://github.com/rust-lang/rust/pull/78068
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[75752]: https://github.com/rust-lang/rust/pull/75752
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[74699]: https://github.com/rust-lang/rust/pull/74699
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[78142]: https://github.com/rust-lang/rust/pull/78142
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[77484]: https://github.com/rust-lang/rust/pull/77484
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[cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
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[cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
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[cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
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[`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
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[`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
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[`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
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[`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
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[`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
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[`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
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[`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
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[`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
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[`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
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[`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
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[`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
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[`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
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[`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
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[`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
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Version 1.49.0 (2020-12-31)
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============================
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Language
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-----------------------
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- [Unions can now implement `Drop`, and you can now have a field in a union
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with `ManuallyDrop<T>`.][77547]
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- [You can now cast uninhabited enums to integers.][76199]
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- [You can now bind by reference and by move in patterns.][76119] This
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allows you to selectively borrow individual components of a type. E.g.
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```rust
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#[derive(Debug)]
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struct Person {
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name: String,
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age: u8,
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}
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let person = Person {
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name: String::from("Alice"),
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age: 20,
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};
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// `name` is moved out of person, but `age` is referenced.
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let Person { name, ref age } = person;
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println!("{} {}", name, age);
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```
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Compiler
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-----------------------
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- [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
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- [Added tier 2 support for `aarch64-apple-darwin`.][75991]
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- [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
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- [Added tier 3 support for `mipsel-unknown-none`.][78676]
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- [Raised the minimum supported LLVM version to LLVM 9.][78848]
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- [Output from threads spawned in tests is now captured.][78227]
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- [Change os and vendor values to "none" and "unknown" for some targets][78951]
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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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- [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
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- [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
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Stabilized APIs
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---------------
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- [`slice::select_nth_unstable`]
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- [`slice::select_nth_unstable_by`]
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- [`slice::select_nth_unstable_by_key`]
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The following previously stable methods are now `const`.
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- [`Poll::is_ready`]
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- [`Poll::is_pending`]
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Cargo
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-----------------------
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- [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
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- [`cargo-tree` now marks proc-macro crates.][cargo/8765]
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- [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
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variable will be set if the crate being built is one the user selected to build, either
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with `-p` or through defaults.
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- [You can now use glob patterns when specifying packages & targets.][cargo/8752]
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Compatibility Notes
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-------------------
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- [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
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- [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
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- [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
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Previously such invalid or unused attributes could be ignored.
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- Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
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read [this post about the changes][rustdoc-ws-post] for more details.
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- [Trait bounds are no longer inferred for associated types.][79904]
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Internal Only
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-------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of rustc and
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related tools.
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- [rustc's internal crates are now compiled using the `initial-exec` Thread
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Local Storage model.][78201]
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- [Calculate visibilities once in resolve.][78077]
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- [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
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- [Added `--color` for configuring terminal color support to bootstrap.][79004]
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[75991]: https://github.com/rust-lang/rust/pull/75991
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[78951]: https://github.com/rust-lang/rust/pull/78951
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[78848]: https://github.com/rust-lang/rust/pull/78848
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[78746]: https://github.com/rust-lang/rust/pull/78746
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[78376]: https://github.com/rust-lang/rust/pull/78376
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[78228]: https://github.com/rust-lang/rust/pull/78228
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[78227]: https://github.com/rust-lang/rust/pull/78227
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[78201]: https://github.com/rust-lang/rust/pull/78201
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[78109]: https://github.com/rust-lang/rust/pull/78109
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[78077]: https://github.com/rust-lang/rust/pull/78077
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[77997]: https://github.com/rust-lang/rust/pull/77997
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[77703]: https://github.com/rust-lang/rust/pull/77703
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[77547]: https://github.com/rust-lang/rust/pull/77547
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[77015]: https://github.com/rust-lang/rust/pull/77015
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[76199]: https://github.com/rust-lang/rust/pull/76199
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[76119]: https://github.com/rust-lang/rust/pull/76119
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[75914]: https://github.com/rust-lang/rust/pull/75914
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[79004]: https://github.com/rust-lang/rust/pull/79004
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[78676]: https://github.com/rust-lang/rust/pull/78676
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[79904]: https://github.com/rust-lang/rust/issues/79904
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[cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
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[cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
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[cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
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[cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
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[`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
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[`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
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[`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
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[`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
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[`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
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[`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
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[rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
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Version 1.48.0 (2020-11-19)
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==========================
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@ -10,7 +256,7 @@ Language
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Compiler
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--------
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- [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
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`rustc` whether to link its own C runtime and libraries or to rely on a external
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`rustc` whether to link its own C runtime and libraries or to rely on a external
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linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
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- [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
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Note: If you're using cargo you must explicitly pass the `--target` flag.
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@ -82,7 +328,7 @@ Compatibility Notes
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- [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
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Note: This behaviour is not guaranteed and is still considered undefined behaviour,
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see the [`catch_unwind`] documentation for further information.
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Internal Only
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@ -102,7 +348,7 @@ related tools.
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[76030]: https://github.com/rust-lang/rust/pull/76030/
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[70212]: https://github.com/rust-lang/rust/pull/70212/
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[27675]: https://github.com/rust-lang/rust/issues/27675/
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[54121]: https://github.com/rust-lang/rust/issues/54121/
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[54121]: https://github.com/rust-lang/rust/issues/54121/
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[71274]: https://github.com/rust-lang/rust/pull/71274/
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[77386]: https://github.com/rust-lang/rust/pull/77386/
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[77153]: https://github.com/rust-lang/rust/pull/77153/
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