private static PySubstitutionChunkReference[] getReferencesFromPercentString(@NotNull final PyStringLiteralExpression element) {
    final List<PyStringFormatParser.SubstitutionChunk>
      chunks = PyStringFormatParser.filterSubstitutions(PyStringFormatParser.parsePercentFormat(element.getText()));
    return getReferencesFromChunks(element, chunks);
  }
private static PySubstitutionChunkReference[] getReferencesFromPercentString(@NotNull final PyStringLiteralExpression element)