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#![feature(unboxed_closures, tuple_trait)]
fn to_fn_once<A:std::marker::Tuple,F:FnOnce<A>>(f: F) -> F { f }
fn do_it(x: &isize) { }
fn main() {
let x: Box<_> = Box::new(22);
let f = to_fn_once(move|| do_it(&*x));
to_fn_once(move|| {
f();
f();
//~^ ERROR: use of moved value: `f`
})()
}
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