| // run-pass |
| #![allow(unused_variables)] |
| struct Foo<'r>(&'r mut i32); |
| |
| impl<'r> Drop for Foo<'r> { |
| fn drop(&mut self) { |
| *self.0 += 1; |
| } |
| } |
| |
| trait Trait {} |
| impl<'r> Trait for Foo<'r> {} |
| |
| struct Holder<T: ?Sized>(T); |
| |
| fn main() { |
| let mut drops = 0; |
| |
| { |
| let y = &Holder([Foo(&mut drops)]) as &Holder<[Foo]>; |
| // this used to cause an extra drop of the Foo instance |
| let x = &y.0; |
| } |
| assert_eq!(1, drops); |
| |
| drops = 0; |
| { |
| let y = &Holder(Foo(&mut drops)) as &Holder<dyn Trait>; |
| // this used to cause an extra drop of the Foo instance |
| let x = &y.0; |
| } |
| assert_eq!(1, drops); |
| } |
