- Stabilized many std APIs (Path::strip_prefix, IPv4/IPv6 helpers, slice conversions, checked/saturating/overflowing ops, hashing, FFI conversions, BTreeMap performance, covariant iterators, str::replace Pattern, etc.).
- Added new error types, faster UTF‑8 validation, Cargo profile flag, and fixed build‑script rerun behavior.
- Breaking changes: stricter soundness checks for associated types/lifetimes, visibility‑calculation warnings, defaulted type‑parameter warnings, parsing "." as a float now errors, and closure‑borrow lifetime restrictions.
Rust 1.7.0
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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.