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// check-pass
use std::marker::PhantomData;
trait Lt<'a> {
type T;
}
struct Id<T>(PhantomData<T>);
impl<'a,T> Lt<'a> for Id<T> {
type T = T;
}
struct Ref<T>(PhantomData<T>) where T: ?Sized;
impl<'a,T> Lt<'a> for Ref<T>
where T: 'a + Lt<'a> + ?Sized
{
type T = &'a T;
}
struct Mut<T>(PhantomData<T>) where T: ?Sized;
impl<'a,T> Lt<'a> for Mut<T>
where T: 'a + Lt<'a> + ?Sized
{
type T = &'a mut T;
}
struct C<I,O>(for<'a> fn(<I as Lt<'a>>::T) -> O) where I: for<'a> Lt<'a>;
fn main() {
let c = C::<Id<_>,_>(|()| 3);
c.0(());
}
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