// compile-flags: -Znext-solver=coherence
// check-pass

// A regression test for trait-system-refactor-initiative#70.

trait Trait {
    type Assoc;
}

struct W<T: ?Sized>(*mut T);
impl<T: ?Sized> Trait for W<W<T>>
where
    W<T>: Trait,
{
    type Assoc = ();
}

trait NoOverlap {}
impl<T: Trait<Assoc = u32>> NoOverlap for T {}
// `Projection(<W<_> as Trait>::Assoc, u32)` should result in error even
// though applying the impl results in overflow. This is necessary to match
// the behavior of the old solver.
impl<T: ?Sized> NoOverlap for W<T> {}

fn main() {}