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@ -17,10 +17,13 @@ Compiler
-------- --------
- [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156] - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
Additionally when in incremental mode rustc defaults to 256 codegen units. Additionally when in incremental mode rustc defaults to 256 codegen units.
- [Added tier 3\* support for the `aarch64-unknown-none` and
`aarch64-unknown-none-softfloat` targets.][68334]
- [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and - [Refactored `catch_unwind`, to have zero-cost unless unwinding is enabled and
a panic is thrown.][67502] a panic is thrown.][67502]
- [Added tier 3\* support for the `aarch64-unknown-none` and
`aarch64-unknown-none-softfloat` targets.][68334]
- [Added tier 3 support for `arm64-apple-tvos` and
`x86_64-apple-tvos` targets.][68191]
Libraries Libraries
--------- ---------
@ -33,6 +36,9 @@ Libraries
- [`String` now implements `From<&mut str>`.][69661] - [`String` now implements `From<&mut str>`.][69661]
- [`IoSlice` now implements `Copy`.][69403] - [`IoSlice` now implements `Copy`.][69403]
- [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is less than 32. - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is less than 32.
- [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
- [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, and `to_be_bytes` methods are
now `const` for all integer types.][69373]
Stabilized APIs Stabilized APIs
--------------- ---------------
@ -84,6 +90,9 @@ Compatibility Notes
source file rather than the previous format of `<NAME macros>`.][70969] source file rather than the previous format of `<NAME macros>`.][70969]
**Note:** this may not point a file that actually exists on the user's system. **Note:** this may not point a file that actually exists on the user's system.
- [The minimum required external LLVM version has been bumped to LLVM 8.][71147] - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
- [`mem::{zeroed, uninitialised, MaybeUninit}` will now panic when used with types
that do not allow zero initialization such as `NonZeroU8`.][66059] This was
previously a warning.
Internal Only Internal Only
------------- -------------
@ -94,7 +103,10 @@ related tools.
- [dep_graph Avoid allocating a set on when the number reads are small.][69778] - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
- [Replace big JS dict with JSON parsing.][71250] - [Replace big JS dict with JSON parsing.][71250]
[69373]: https://github.com/rust-lang/rust/pull/69373/
[66059]: https://github.com/rust-lang/rust/pull/66059/
[68191]: https://github.com/rust-lang/rust/pull/68191/
[68899]: https://github.com/rust-lang/rust/pull/68899/
[71147]: https://github.com/rust-lang/rust/pull/71147/ [71147]: https://github.com/rust-lang/rust/pull/71147/
[71250]: https://github.com/rust-lang/rust/pull/71250/ [71250]: https://github.com/rust-lang/rust/pull/71250/
[70937]: https://github.com/rust-lang/rust/pull/70937/ [70937]: https://github.com/rust-lang/rust/pull/70937/