{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"cov_mark::hit!(expected_type_fn_param_ref);"}]}
                cov_mark::hit!(expected_type_fn_param_ref);
            for _ in top_syn.ancestors().skip(1).map_while(ast::RefExpr::cast) {
                ty = ty.strip_reference();