@Override
  protected boolean checkReferencedExpression(@NotNull List<SubstitutionChunk> chunks,
                                              @NotNull SubstitutionChunk chunk,
                                              @NotNull PsiElement valueSource,
                                              @NotNull PyExpression expression) {
    if ((chunk.getMappingKey() != null || chunks.size() > 1) && expression == valueSource) return false;
    return super.checkReferencedExpression(chunks, chunk, valueSource, expression);
  }
@Override
  protected boolean checkReferencedExpression(@NotNull List<SubstitutionChunk> chunks,
                                              @NotNull SubstitutionChunk chunk,
                                              @NotNull PsiElement valueSource,
                                              @NotNull PyExpression expression)