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Regression test for dropflag reinit issue.
Fix #27401.
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// Copyright 2015 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. | ||
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// Check that when a `let`-binding occurs in a loop, its associated | ||
// drop-flag is reinitialized (to indicate "needs-drop" at the end of | ||
// the owning variable's scope). | ||
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struct A<'a>(&'a mut i32); | ||
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impl<'a> Drop for A<'a> { | ||
fn drop(&mut self) { | ||
*self.0 += 1; | ||
} | ||
} | ||
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fn main() { | ||
let mut cnt = 0; | ||
for i in 0..2 { | ||
let a = A(&mut cnt); | ||
if i == 1 { // Note that | ||
break; // both this break | ||
} // and also | ||
drop(a); // this move of `a` | ||
// are necessary to expose the bug | ||
} | ||
assert_eq!(cnt, 2); | ||
} |