- Fix ICE in duplicate crate diagnostics and errors for overlapping impls during incremental rebuilds
- Correct debuginfo handling when LLVM location discriminator limit is exceeded and address slow compilation from the next‑generation trait solver
- Improve source build process: conditionally distribute llvm‑objcopy, add profile override for non‑git sources, resolve llvm tool symlinks, and allow ci rustc on tarball sources
Rust 1.84.1
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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.