2ed4734873
the leading quote part of the identifier for the purposes of hygiene. This adopts @jbclements' solution to #14539. I'm not sure if this is a breaking change or not. Closes #12512. [breaking-change]
20 lines
650 B
Rust
20 lines
650 B
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(macro_rules)]
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macro_rules! foo {
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($e: expr) => { 'x: for _ in range(0,1) { $e } }
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}
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pub fn main() {
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foo!(break 'x); //~ ERROR use of undeclared label `'x`
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}
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