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//@ run-pass
#![allow(dead_code)]
// Ensures that destructors are run for expressions of the form "let _ = e;"
// where `e` is a type which requires a destructor.
// FIXME(static_mut_refs): Do not allow `static_mut_refs` lint
#![allow(static_mut_refs)]
struct Foo;
struct Bar { x: isize }
struct Baz(isize);
enum FooBar { _Foo(Foo), _Bar(usize) }
static mut NUM_DROPS: usize = 0;
impl Drop for Foo {
fn drop(&mut self) {
unsafe { NUM_DROPS += 1; }
}
}
impl Drop for Bar {
fn drop(&mut self) {
unsafe { NUM_DROPS += 1; }
}
}
impl Drop for Baz {
fn drop(&mut self) {
unsafe { NUM_DROPS += 1; }
}
}
impl Drop for FooBar {
fn drop(&mut self) {
unsafe { NUM_DROPS += 1; }
}
}
fn main() {
assert_eq!(unsafe { NUM_DROPS }, 0);
{ let _x = Foo; }
assert_eq!(unsafe { NUM_DROPS }, 1);
{ let _x = Bar { x: 21 }; }
assert_eq!(unsafe { NUM_DROPS }, 2);
{ let _x = Baz(21); }
assert_eq!(unsafe { NUM_DROPS }, 3);
{ let _x = FooBar::_Foo(Foo); }
assert_eq!(unsafe { NUM_DROPS }, 5);
{ let _x = FooBar::_Bar(42); }
assert_eq!(unsafe { NUM_DROPS }, 6);
{ let _ = Foo; }
assert_eq!(unsafe { NUM_DROPS }, 7);
{ let _ = Bar { x: 21 }; }
assert_eq!(unsafe { NUM_DROPS }, 8);
{ let _ = Baz(21); }
assert_eq!(unsafe { NUM_DROPS }, 9);
{ let _ = FooBar::_Foo(Foo); }
assert_eq!(unsafe { NUM_DROPS }, 11);
{ let _ = FooBar::_Bar(42); }
assert_eq!(unsafe { NUM_DROPS }, 12);
}
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