- Stabilized new language and library features: raw dylib, extern "C" unwind, and numerous const APIs (e.g., CStr::is_empty, NonZeroI ops, const read/write).
- Improved panic handling: recursive panics now abort, unnecessary Send bounds removed from mpsc errors, and From<&[T]> for Box<[T]> loosened.
- Breaking compatibility change: structural match removed from TypeId, requiring updates to code that patters on TypeId; Cargo now disallows RUSTUP_HOME and RUSTUP_TOOLCHAIN in env config.
Rust 1.71.0
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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.