- Stabilized several language and library features: repr(align), nested import groups, Float::from_bits/to_bits in core, const Duration constructors, and AsRef<Path for Component.
- Compiler upgraded to LLVM 6; added new target (i586‑unknown‑linux‑musl) and C lto=val option; Cargo now defaults to creating binary crates.
- Borrow‑checker fix for overlapping borrows, rustdoc now uses pulldown markdown, and deprecated items (net::lookup_host, SIMD attribute) were marked or removed.
Rust 1.25.0
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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.