- rustc now uses the new Middle IR (MIR) for code generation, simplifying the LLVM pass and enabling new optimizations.
- Error messages are more readable and include machine‑readable JSON output for IDEs.
- Extensive library and Cargo updates: new MUSL ARM targets, macro hygiene improvements, additional std APIs, cargo command aliases, opt‑level overrides, and source package distribution via rustup.
Rust 1.12.0
Official Rust changelog summary with source attribution, release tags, and community reactions.
Track this Rust release note alongside related changelog updates, risky changes, and weekly digest signals from the developer community.
Verify the original release note
Every summary should remain traceable to the original changelog or release source.
Follow this in context
Turn this Rust release note into a weekly digest for the tools you actually use.
Create digestMore Rust changelog updates
Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.