@Override
 public Collection<InterfaceType> getSuperinterfaces() {
   Debug.notimplemented(
       "Collection<InterfaceType>"); // todo: implement ConvertDeclaredType.getSuperinterfaces
   return null;
 }
 @Override
 public com.sun.mirror.type.DeclaredType getContainingType() {
   Debug.notimplemented("DeclaredType"); // todo: implement ConvertDeclaredType.getContainingType
   return null;
 }