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// run-pass
struct A<F: FnOnce()->T,T>(F::Output);
struct B<F: FnOnce()->T,T>(A<F,T>);
// Removing Option causes it to compile.
fn foo<T,F: FnOnce()->T>(f: F) -> Option<B<F,T>> {
Some(B(A(f())))
}
fn main() {
let v = (|| foo(||4))();
match v {
Some(B(A(4))) => {},
_ => unreachable!()
}
}
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