- Added macro‑attribute support after #[derive], curly‑brace macro calls in expressions, and allowed panics in const evaluation.
- Stabilized numerous const‑compatible APIs (e.g., try_reserve, as_slice, Command::get_*), introduced must‑use warnings, and improved debuginfo for vtables.
- Expanded Tier‑3 platform support (armv6k 3DS, armv7 uclibc, m68k, SOLID) and added an experimental libgccjit codegen backend, which may break builds that #[deny(dead_code)].
Rust 1.57.0
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.