{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"cov_mark::hit!(existing_infer_ret_type_closure);"}]}
                cov_mark::hit!(existing_infer_ret_type_closure);
                cov_mark::hit!(existing_infer_ret_type);
                Some(InsertOrReplace::Replace(ret_ty.syntax().text_range()))