| #![feature(box_syntax)] | |
| struct Foo { | |
| x: isize | |
| } | |
| impl Drop for Foo { | |
| fn drop(&mut self) { | |
| println!("drop {}", self.x); | |
| } | |
| } | |
| fn main() { | |
| let mut ptr: Box<_> = box Foo { x: 0 }; | |
| let mut test = |foo: &Foo| { | |
| println!("access {}", foo.x); | |
| ptr = box Foo { x: ptr.x + 1 }; | |
| println!("access {}", foo.x); | |
| }; | |
| test(&*ptr); | |
| //~^ ERROR: cannot borrow `*ptr` as immutable | |
| } |