@Nullable
  private static PyArgumentList getArgumentList(final PsiElement original) {
    final PsiElement pyReferenceExpression = PsiTreeUtil.getParentOfType(original, PyReferenceExpression.class);
    return PsiTreeUtil.getNextSiblingOfType(pyReferenceExpression, PyArgumentList.class);
  }
@Nullable
  private static PyArgumentList getArgumentList(final PsiElement original)