- Added language features such as matching multiple tuple fields, safe‑fn‑to‑unsafe‑fn coercions, new iterator traits (TrustedLen, .zip() specialization) and stricter pattern‑matching lints
- Implemented many performance and allocation optimizations in macro expansion, iterator folds, HashMap layout and other core libraries
- Expanded platform support (MIPS, PowerPC, S390x, ARM‑MUSL, experimental WebAssembly), changed rustup to not install docs by default, and made forward‑compatibility lints deny‑by‑default (breaking change)
Rust 1.14.0
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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.