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trait Foo { type Bar; } trait Baz<T> where T: ?Sized + Foo, Self: Foo<Bar = <T as Foo>::Bar> {} trait Qux where Self: Baz<Self> {} struct Qax {} impl Foo for Qax { type Bar = u32; } impl Baz<Qax> for Qax {} impl Qux for Qax {}