src/test/ui/associated-types/associated-types-project-from-hrtb-in-trait-method.rs

// Check projection of an associated type out of a higher-ranked trait-bound
// in the context of a method definition in a trait.

pub trait Foo<T> {
    type A;

    fn get(&self, t: T) -> Self::A;
}

trait SomeTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method(&self, arg: I::A);
    //~^ ERROR cannot extract an associated type from a higher-ranked trait bound in this context
}

trait AnotherTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method(&self, arg: <I as Foo<&isize>>::A);
}

trait YetAnotherTrait<I : for<'x> Foo<&'x isize>> {
    fn some_method<'a>(&self, arg: <I as Foo<&'a isize>>::A);
}

pub fn main() {}