- Stabilized pub(restricted) syntax (e.g., pub(crate)) and added several new stable APIs such as Child::try_wait, HashMap::retain, and rustc's ability to emit MIR with improved LLVM IR for trivial functions
- Introduced multiple performance and safety enhancements: reordered struct layout to reduce padding, optimized Vec::from and HashMap bucket iteration, faster insertion sort, AtomicBool::fetch_nand improvements, and overall faster compilation
- Added breaking changes: transmute on structs without explicit repr now UB, overlapping inherent impls are hard errors, PartialOrd/Ord must agree, functions returning Self are rejected when Self's size isn’t statically known, and MinGW li...
Rust 1.18.0
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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.