{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"Err(err)"}]}
            Err(err) => Err(report_lit_error(&cx.sess.psess, err, token_lit, expr.span)),
            Ok(ast::LitKind::Err(guar)) => Err(guar),
            _ => Ok((cx.dcx().struct_span_err(expr.span, err_msg), false)),