// no resolution needed
      return subclass;
    }
    // class Base<A, B> {}
    // class Sub<X, Y> extends Base<X, Y> {}
    // Base<String, Integer>.subtype(Sub.class):

    // Sub<X, Y>.getSupertype(Base.class) => Base<X, Y>
    // => X=String, Y=Integer
    // => Sub<X, Y>=Sub<String, Integer>
    TypeToken<?> genericSubtype = toGenericType(subclass);