// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(macro_rules)] macro_rules! foo { ($e: expr) => { 'x: for _ in range(0,1) { $e } } } pub fn main() { foo!(break 'x); //~ ERROR use of undeclared label `x` }