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// 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);
}
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