mirror of
https://github.com/rust-lang/rust
synced 2024-09-06 01:11:17 +00:00
59 lines
1.4 KiB
Rust
59 lines
1.4 KiB
Rust
//@ run-pass
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#![allow(dead_code)]
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// Ensures that destructors are run for expressions of the form "let _ = e;"
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// where `e` is a type which requires a destructor.
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struct Foo;
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struct Bar { x: isize }
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struct Baz(isize);
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enum FooBar { _Foo(Foo), _Bar(usize) }
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static mut NUM_DROPS: usize = 0;
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impl Drop for Foo {
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fn drop(&mut self) {
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unsafe { NUM_DROPS += 1; }
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}
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}
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impl Drop for Bar {
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fn drop(&mut self) {
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unsafe { NUM_DROPS += 1; }
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}
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}
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impl Drop for Baz {
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fn drop(&mut self) {
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unsafe { NUM_DROPS += 1; }
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}
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}
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impl Drop for FooBar {
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fn drop(&mut self) {
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unsafe { NUM_DROPS += 1; }
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}
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}
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fn main() {
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assert_eq!(unsafe { NUM_DROPS }, 0);
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{ let _x = Foo; }
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assert_eq!(unsafe { NUM_DROPS }, 1);
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{ let _x = Bar { x: 21 }; }
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assert_eq!(unsafe { NUM_DROPS }, 2);
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{ let _x = Baz(21); }
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assert_eq!(unsafe { NUM_DROPS }, 3);
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{ let _x = FooBar::_Foo(Foo); }
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assert_eq!(unsafe { NUM_DROPS }, 5);
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{ let _x = FooBar::_Bar(42); }
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assert_eq!(unsafe { NUM_DROPS }, 6);
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{ let _ = Foo; }
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assert_eq!(unsafe { NUM_DROPS }, 7);
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{ let _ = Bar { x: 21 }; }
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assert_eq!(unsafe { NUM_DROPS }, 8);
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{ let _ = Baz(21); }
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assert_eq!(unsafe { NUM_DROPS }, 9);
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{ let _ = FooBar::_Foo(Foo); }
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assert_eq!(unsafe { NUM_DROPS }, 11);
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{ let _ = FooBar::_Bar(42); }
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assert_eq!(unsafe { NUM_DROPS }, 12);
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}
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