=== test/A.java ===
package test;

public class A<U> {
  public class Inner {
  } 
}

=== test/D.java ===
package test;

public class D<Z> {
  public class Inner extends A<Z> {
  }
  public class F<X> extends D<X>.Inner {
  }
}

=== test/Test.java ===
package test;

public class Test {
  D<D<Test>>.F<Test>.Inner i3;
}