| //@ edition:2015..2021 | |
| // Creating a stack closure which references a box and then | |
| // transferring ownership of the box before invoking the stack | |
| // closure results in a crash. | |
| fn twice(x: Box<usize>) -> usize { | |
| *x * 2 | |
| } | |
| fn invoke<F>(f: F) where F: FnOnce() -> usize { | |
| f(); | |
| } | |
| fn main() { | |
| let x : Box<usize> = Box::new(9); | |
| let sq = || { *x * *x }; | |
| twice(x); //~ ERROR: cannot move out of | |
| invoke(sq); | |
| } |