{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"cov_mark::hit!(existing_infer_ret_type);"}]}
                cov_mark::hit!(existing_infer_ret_type);
            Some(ast::Type::InferType(_)) | None => {
                cov_mark::hit!(existing_infer_ret_type_closure);