Rollup of 5 pull requests Successful merges: - #64221 ( Rust 2015: No longer downgrade NLL errors) - #64772 (Remove tx_to_llvm_workers from TyCtxt) - #64783 (Fix issue #64732) - #64787 (Fix ExitStatus on Fuchsia) - #64812 (Add test for E0543) Failed merges: r? @ghost
subst::Kind
subst::GenericArg
LocalInternedString
librustc/ty/