- Split diagnostic attribute lint into four specific lints and stabilize signed integer subtractions (checked, overflowing, saturating, wrapping) plus many const‑stabilized APIs.
- Switch the default linker to lld on x86_64‑linux‑gnu, link Tier‑3 musl targets dynamically, demote macOS to Tier‑2, and add new Cargo proxy configuration and multi‑package publishing support.
- Add MSG_NOSIGNAL for UnixStream, enable volatile access to non‑Rust memory, provide CStr/CString/Cow comparison traits, and improve rustdoc impl‑collapse and unsafe‑attribute display.
Rust 1.90.0
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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.