- Stabilized basic procedural macros (custom derive) and added macro‑related enhancements, along with name‑resolution and type‑system refinements.
- Cargo build scripts can no longer access OUT_DIR at compile time via env!("OUT_DIR"); they must read it at runtime, introducing a breaking change.
- Performance and API updates: new hybrid merge sort, faster hash function, iterator improvements, many std lib APIs stabilized, and deprecation of the C no‑stack‑check flag.
Rust 1.15.0
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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.