Rollup of 7 pull requests Successful merges: - #122858 (Tweak `parse_dot_suffix_expr`) - #122982 (Add more comments to the bootstrap code that handles `tests/coverage`) - #122990 (Clarify transmute example) - #122995 (Clean up unnecessary headers/flags in coverage mir-opt tests) - #123003 (CFI: Handle dyn with no principal) - #123005 (CFI: Support complex receivers) - #123020 (Temporarily remove nnethercote from the review rotation.) r? `@ghost` `@rustbot` modify labels: rollup