{"ast_node_type":"variable","tokens":[{"end":106,"kind":"keyword","start":0,"text":"let"}]}
                            let fake_param_list = param.syntax().parent().and_then(ast::ParamList::cast)?;
                        param_ctx = (|| {
                            let param_list = find_node_in_file_compensated(sema, original_file, &fake_param_list)?;