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Auto merge of #86696 - rust-lang:relnotes-1.54.0, r=pietroalbini
Update RELEASES.md for 1.54.0 ### [Rendered](https://github.com/rust-lang/rust/blob/relnotes-1.54.0/RELEASES.md) r? `@Mark-Simulacrum` cc `@rust-lang/release`
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RELEASES.md
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RELEASES.md
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Version 1.54.0 (2021-07-29)
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============================
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Language
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-----------------------
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- [You can now use macros for values in built-in attribute macros.][83366]
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While a seemingly minor addition on its own, this enables a lot of
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powerful functionality when combined correctly. Most notably you can
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now include external documentation in your crate by writing the following.
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```rust
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#![doc = include_str!("README.md")]
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```
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You can also use this to include auto-generated modules:
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```rust
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#[path = concat!(env!("OUT_DIR"), "/generated.rs")]
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mod generated;
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```
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- [You can now cast between unsized slice types (and types which contain
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unsized slices) in `const fn`.][85078]
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- [You can now use multiple generic lifetimes with `impl Trait` where the
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lifetimes don't explicitly outlive another.][84701] In code this means
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that you can now have `impl Trait<'a, 'b>` where as before you could
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only have `impl Trait<'a, 'b> where 'b: 'a`.
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Compiler
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-----------------------
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- [Rustc will now search for custom JSON targets in
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`/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
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directory.][83800] You can find your sysroot directory by running
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`rustc --print sysroot`.
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- [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
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- [You can now use `#[target_feature]` on safe functions when targeting
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WebAssembly platforms.][84988]
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- [Improved debugger output for enums on Windows MSVC platforms.][85292]
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- [Added tier 3\* support for `bpfel-unknown-none`
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and `bpfeb-unknown-none`.][79608]
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\* Refer to Rust's [platform support page][platform-support-doc] 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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- [`panic::panic_any` will now `#[track_caller]`.][85745]
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- [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
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- [ `proc_macro::Literal` now implements `FromStr`.][84717]
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- [The implementations of vendor intrinsics in core::arch have been
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significantly refactored.][83278] The main user-visible changes are
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a 50% reduction in the size of libcore.rlib and stricter validation
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of constant operands passed to intrinsics. The latter is technically
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a breaking change, but allows Rust to more closely match the C vendor
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intrinsics API.
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Stabilized APIs
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---------------
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- [`BTreeMap::into_keys`]
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- [`BTreeMap::into_values`]
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- [`HashMap::into_keys`]
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- [`HashMap::into_values`]
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- [`arch::wasm32`]
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- [`VecDeque::binary_search`]
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- [`VecDeque::binary_search_by`]
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- [`VecDeque::binary_search_by_key`]
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- [`VecDeque::partition_point`]
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Cargo
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-----
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- [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
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the dependency graph.][cargo/9520]
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- [Added the `--depth` option to `cargo-tree` to print only to a certain depth
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in the tree ][cargo/9499]
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- [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
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macro dependencies.][cargo/9488]
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- [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
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This variable points to a directory that integration tests and benches
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can use as a "scratchpad" for testing filesystem operations.
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Compatibility Notes
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-------------------
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- [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
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- [Previously unsound code is no longer permitted where different constructors in branches
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could require different lifetimes.][85574]
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- As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
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than before and may reject some previously accepted code.
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- [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
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when compiled with `codegen-units = 1`.][86063]
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[85574]: https://github.com/rust-lang/rust/issues/85574
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[86831]: https://github.com/rust-lang/rust/issues/86831
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[86063]: https://github.com/rust-lang/rust/issues/86063
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[86831]: https://github.com/rust-lang/rust/issues/86831
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[79608]: https://github.com/rust-lang/rust/pull/79608
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[84988]: https://github.com/rust-lang/rust/pull/84988
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[84701]: https://github.com/rust-lang/rust/pull/84701
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[84072]: https://github.com/rust-lang/rust/pull/84072
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[85745]: https://github.com/rust-lang/rust/pull/85745
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[84744]: https://github.com/rust-lang/rust/pull/84744
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[85078]: https://github.com/rust-lang/rust/pull/85078
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[84717]: https://github.com/rust-lang/rust/pull/84717
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[83800]: https://github.com/rust-lang/rust/pull/83800
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[83366]: https://github.com/rust-lang/rust/pull/83366
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[83278]: https://github.com/rust-lang/rust/pull/83278
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[85292]: https://github.com/rust-lang/rust/pull/85292
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[cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
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[cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
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[cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
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[cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
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[`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
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[`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
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[`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
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[`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
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[`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
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[`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
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[`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
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[`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
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[`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
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Version 1.53.0 (2021-06-17)
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============================
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@ -1749,7 +1873,7 @@ Language
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- [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
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that you can create an enum that has the exact layout and ABI of the type
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it contains.
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- [You can now use outer attribute procedural macros on inline modules.][64273]
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- [You can now use outer attribute procedural macros on inline modules.][64273]
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- [There are some *syntax-only* changes:][67131]
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- `default` is syntactically allowed before items in `trait` definitions.
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- Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
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