- Added pipelined compilation support to rustc and cargo, improving compilation speed and allowing multiple feature flags.
- Expanded platform support with new tier‑3 targets (UWP Windows variants, armv7 Linux, Hexagon, RISC‑V) and upgraded LLVM to version 9.
- Stabilized numerous library APIs: global allocator in submodules, deprecated attribute on macros, const casts, euclidean division/remainder, and many new trait implementations (e.g., EscapeDefault Clone/Display, slice::concat overloads, ...
Rust 1.38.0
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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.