- Stabilized many language features: repr(transparent), global allocator APIs, test functions returning Result, macro lifetime specifier, s/z optimization levels, short error format, and new lint for duplicated macro exports.
- Expanded library support with numerous From/Extend/Default implementations, Shl/Shr for Wrapping<u128/i128>, improved Duration debug output, and faster DirEntry metadata via fstatat.
- Cargo now prohibits build scripts from modifying a crate's src directory; trait objects with duplicated constraints are now treated as errors (breaking change).
Rust 1.28.0
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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.