- Stabilized many new const APIs and library enhancements (array traits for any length, Range defaults, CStr indexing, panic::Location impls, char ASCII methods) and added new targets with LLVM 11 upgrade.
- Enabled the C control‑flow guard codegen option for Windows (security), and improved Cargo defaults (opt‑level 0, man‑page help, test field in metadata, workspace.exclude respect, default alternative registry) plus rustdoc UI updates (he...
- Fixed regressions (tail‑expression parsing, proc‑macro span handling) and raised platform minimums (FreeBSD toolchain 11.4, Linux kernel 2.6.32/glibc 2.11, Emscripten 1.39.20).
Rust 1.47.0
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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.