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// run-pass
#![feature(unboxed_closures)]
#![feature(fn_traits)]
struct Fun<F>(F);
impl<F, T> FnOnce<(T,)> for Fun<F> where F: Fn(T) -> T {
type Output = T;
extern "rust-call" fn call_once(self, (t,): (T,)) -> T {
(self.0)(t)
}
}
fn main() {
let fun = Fun(|i: isize| i * 2);
println!("{}", fun(3));
}
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