- Added several language features including opaque types in defining bodies, C string literals, async recursive calls, and new lints for static mut refs and braced macro invocations.
- Improved compiler internals: 16‑byte alignment for i128/u128 on x86, expanded tier‑3 target list, richer diagnostics, coverage instrumentation fixes, and well‑formedness checks.
- Updated Cargo and libraries: new build directive syntax, stable metadata ID format, stripped debug info by default, deprecated rustc‑plugin support, stabilized many std APIs, and added From<&[T;N]> for Cow.
Rust 1.77.0
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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.