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Regression tests for Issue rust-lang#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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// The stack-local drop flag associated with binding `let a = ...;` | ||
// (that occurred in a loop) were failing to (re-)initialize the drop | ||
// flag after it had been set to "moved" during an earlier iteration | ||
// of the loop. | ||
// | ||
// This is a regression test to ensure we don't let that behavior | ||
// creep back in. | ||
// | ||
// See also issue-27401-match-bind.rs | ||
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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 { | ||
break | ||
} | ||
drop(a); | ||
} | ||
assert_eq!(cnt, 2); | ||
} |
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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. | ||
|
||
// The stack-local drop flag for binding in match-arm `(_, a) => ...` | ||
// (that occurred in a loop) were failing to (re-)initialize the drop | ||
// flag after it had been set to "moved" during an earlier iteration | ||
// of the loop. | ||
// | ||
// This is a regression test to ensure we don't let that behavior | ||
// creep back in. | ||
// | ||
// See also issue-27401-let-init.rs | ||
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use std::cell::Cell; | ||
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struct A<'a>(&'a Cell<i32>); | ||
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impl<'a> Drop for A<'a> { | ||
fn drop(&mut self) { | ||
let old_val = self.0.get(); | ||
self.0.set(old_val + 1); | ||
} | ||
} | ||
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fn main() { | ||
let cnt = Cell::new(0); | ||
for i in 0..2 { | ||
match (A(&cnt), A(&cnt)) { | ||
(_, aaah) => { | ||
if i == 1 { | ||
break | ||
} | ||
drop(aaah); | ||
} | ||
} | ||
} | ||
assert_eq!(cnt.get(), 4); | ||
} |