- Stabilized major language features: impl Trait, inclusive range syntax, 128‑bit integers, const evaluation for many operations, and Copy/Clone for closures.
- Extended standard library with new APIs and performance improvements, such as default/hash for cmp::Reverse, 8× faster str::repeat, hexadecimal Debug formatting, and additional const methods.
- Breaking changes and deprecations: Fn alias syntax invalidated, deref results no longer promoted to 'static, .e0 literal now errors, AsciiExt deprecated, higher‑kinded lifetimes now hard errors, and hoedown removed from rustdoc.
Rust 1.26.0
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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.