- Security and soundness fixes for packed structs, dynamic size/align of packed dyn traits, and addition of Windows EHCont support.
- Tier‑3 platform support added for Windows 7 MSVC, Apple watchOS, and arm64e iOS/Darwin; legacy Solaris and asmjs targets removed.
- Stabilized many new APIs (Arc/Rc::unwrap_or_clone, Result/Option::inspect, ptr::from_ref/mut, type_name_of_val) and library improvements (dbg!() column numbers, hidden‑file creation, RwLock guard Debug impls).
Rust 1.76.0
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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.