{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"//"}]}
        // Here we know that nothing will contribute further to exhaustiveness or usefulness. This
    if !matrix.wildcard_row_is_relevant && matrix.rows().all(|r| !r.pats.relevant) {
        // is purely an optimization: skipping this check doesn't affect correctness. See the top of