| // run-pass | |
| // Tests that unary structs can be mutably borrowed. | |
| struct Empty; | |
| trait T<U> { | |
| fn next(&mut self) -> Option<U>; | |
| } | |
| impl T<isize> for Empty { | |
| fn next(&mut self) -> Option<isize> { None } | |
| } | |
| fn do_something_with(a : &mut dyn T<isize>) { | |
| println!("{:?}", a.next()) | |
| } | |
| pub fn main() { | |
| do_something_with(&mut Empty); | |
| } |