mirror of https://github.com/rust-lang/rust
42 lines
805 B
Rust
42 lines
805 B
Rust
//@ run-pass
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// This test verifies that temporaries created for `while`'s and `if`
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// conditions are dropped after the condition is evaluated.
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struct Temporary;
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static mut DROPPED: isize = 0;
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impl Drop for Temporary {
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fn drop(&mut self) {
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unsafe { DROPPED += 1; }
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}
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}
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impl Temporary {
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fn do_stuff(&self) -> bool {true}
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}
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fn borrow() -> Box<Temporary> { Box::new(Temporary) }
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pub fn main() {
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let mut i = 0;
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// This loop's condition
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// should call `Temporary`'s
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// `drop` 6 times.
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while borrow().do_stuff() {
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i += 1;
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unsafe { assert_eq!(DROPPED, i) }
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if i > 5 {
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break;
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}
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}
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// This if condition should
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// call it 1 time
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if borrow().do_stuff() {
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unsafe { assert_eq!(DROPPED, i + 1) }
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}
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}
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