rust/src/test/run-pass/hygienic-labels.rs

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// 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.
// pretty-expanded FIXME #23616
macro_rules! loop_x {
($e: expr) => {
// $e shouldn't be able to interact with this 'x
'x: loop { $e }
}
}
macro_rules! run_once {
($e: expr) => {
// ditto
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'x: for _ in 0..1 { $e }
}
}
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macro_rules! while_x {
($e: expr) => {
// ditto
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'x: while 1 + 1 == 2 { $e }
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}
}
pub fn main() {
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'x: for _ in 0..1 {
// this 'x should refer to the outer loop, lexically
loop_x!(break 'x);
panic!("break doesn't act hygienically inside for loop");
}
'x: loop {
// ditto
loop_x!(break 'x);
panic!("break doesn't act hygienically inside infinite loop");
}
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'x: while 1 + 1 == 2 {
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while_x!(break 'x);
panic!("break doesn't act hygienically inside infinite while loop");
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}
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'x: for _ in 0..1 {
// ditto
run_once!(continue 'x);
panic!("continue doesn't act hygienically inside for loop");
}
}