{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"(pat,"}]}
        (pat, pat2) => match (binds_name(sema, &pat), binds_name(sema, &pat2)) {
        (_, pat) if is_empty_expr(&expr) => (pat, expr2, expr),
            (true, true) => return None,