rust/src/test/compile-fail/hygienic-label-4.rs

// 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 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

macro_rules! foo {
    ($e: expr) => { 'x: for _ in 0..1 { $e } }
}

pub fn main() {
    foo!(break 'x); //~ ERROR use of undeclared label `'x`
}