@Nullable
 public QualifiedName asQualifiedName() {
   if (myQualifiedName == null) {
     myQualifiedName = PyPsiUtils.asQualifiedName(this);
   }
   return myQualifiedName;
 }
 @Nullable
 @Override
 public QualifiedName asQualifiedName() {
   return PyPsiUtils.asQualifiedName(this);
 }