| //@ 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); |
| } |
