rust/tests/pass/drop_through_trait_object.rs

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trait Foo {}
struct Bar;
static mut DROP_CALLED: bool = false;
impl Drop for Bar {
fn drop(&mut self) {
unsafe {
DROP_CALLED = true;
}
}
}
impl Foo for Bar {}
fn main() {
let b: Box<dyn Foo> = Box::new(Bar);
assert!(unsafe { !DROP_CALLED });
drop(b);
assert!(unsafe { DROP_CALLED });
}