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trait MyFn<Arg> {
type Output;
fn call(&self, arg: Arg) -> Self::Output;
}
struct Wrap<F>(F);
impl<A, B, F> MyFn<A> for Wrap<F>
where
F: Fn(A) -> B
{
type Output = B;
fn call(&self, arg: A) -> Self::Output {
(self.0)(arg)
}
}
struct A;
fn test() -> impl for<'a> MyFn<&'a A, Output=impl Iterator + 'a> {
//~^ ERROR higher kinded lifetime bounds on nested opaque types are not supported yet
Wrap(|a| Some(a).into_iter())
}
fn main() {}
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