@Nullable
  private Ref<PyExpression> resolveKeywordStarExpression(@NotNull PyStarArgument starArgument) {
    // TODO: support call, reference expressions here
    final PyDictLiteralExpression dictExpr = PsiTreeUtil.getChildOfType(starArgument, PyDictLiteralExpression.class);
    final PyCallExpression callExpression = PsiTreeUtil.getChildOfType(starArgument, PyCallExpression.class);
    final String key = myChunk.getMappingKey();
    assert key != null;
    if (dictExpr != null) {
      return getElementFromDictLiteral(dictExpr, key);
    }
    else if (callExpression != null) {
      return resolveDictCall(callExpression, key, false);
    }
    return null;
  }
@Nullable
  private Ref<PyExpression> resolveKeywordStarExpression(@NotNull PyStarArgument starArgument)