framework/tests/all-systems/Issue3570.java

@SuppressWarnings("all") // Check for crashes.
public class Issue3570 {
  public interface Freezable<T extends Freezable> extends Cloneable {}

  public static final class Key<T extends Keyed> extends Iced<Key<T>> implements Comparable {
    @Override
    public int compareTo(Object o) {
      return 0;
    }
  }

  public abstract static class Keyed<T extends Keyed> extends Iced<T> {}

  public abstract static class Lockable<T extends Lockable<T>> extends Keyed<T> {}

  public abstract static class Iced<D extends Iced>
      implements Freezable<D>, java.io.Externalizable {
    @Override
    public void readExternal(java.io.ObjectInput ois)
        throws java.io.IOException, ClassNotFoundException {}

    @Override
    public void writeExternal(java.io.ObjectOutput oos) throws java.io.IOException {}
  }

  public abstract static class Model<
          M extends Model<M, P, O>, P extends Model.Parameters, O extends Model.Output>
      extends Lockable<M> {
    public P _parms;

    public abstract static class Parameters extends Iced<Parameters> {
      public Key<Frame> _train;
    }

    public abstract static class Output extends Iced {}
  }

  public static class Frame extends Lockable<Frame> {}

  public abstract static class Schema<I extends Iced, S extends Schema<I, S>> extends Iced {}

  public static class SchemaV3<I extends Iced, S extends SchemaV3<I, S>> extends Schema<I, S> {}

  public static class KeyV3<I extends Iced, S extends KeyV3<I, S, K>, K extends Keyed>
      extends SchemaV3<I, KeyV3<I, S, K>> {
    public KeyV3(Key key) {}

    public static class FrameKeyV3 extends KeyV3<Iced, FrameKeyV3, Frame> {
      public FrameKeyV3(Key<Frame> key) {
        super(key);
      }
    }
  }

  public static class ModelSchemaBaseV3<M extends Model<M, ?, ?>, S extends ModelSchemaBaseV3<M, S>>
      extends SchemaV3<M, S> {
    public KeyV3.FrameKeyV3 data_frame;

    public ModelSchemaBaseV3(M m) {
      this.data_frame = new KeyV3.FrameKeyV3(m._parms._train);
    }
  }
}