- Added sysv64 external ABI, new armv4t‑linux‑gnueabi and aarch64‑openbsd targets, and default 16 codegen units for release builds; incremental compilation enabled by default for development builds.
- Performance and API upgrades: string search methods now use memchr for ~10× speedups, [u8]::contains 3× faster, optimized f32 min/max assembly, numerous new From implementations for Arc/Rc, const‑eval support for many atomic and Cell fun...
- Breaking changes: unwinding now aborts across FFI boundaries, Formatter::flags deprecated, repr(packed) field access marked unsafe, fmt::Arguments no longer Send, stricter IPv6 parsing, and column! macro switched to 1‑based indexing.
Rust 1.24.0
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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.