foo1.cs

    public void Run(ITreeNode element, ElementProblemAnalyzerData data, IHighlightingConsumer consumer)
    {
      var prefixOperatorExpression = element as IPrefixOperatorExpression;
      if (prefixOperatorExpression != null)
      {
        switch (prefixOperatorExpression.PrefixOperatorType)
        {
          case PrefixOperatorType.PLUSPLUS:
          case PrefixOperatorType.MINUSMINUS:
          {
            AnalyzeAssignment(consumer, prefixOperatorExpression, prefixOperatorExpression.Operand);
            break;
          }
        }
      }

      var postfixOperatorExpression = element as IPostfixOperatorExpression;
      if (postfixOperatorExpression != null)
      {
        switch (postfixOperatorExpression.PostfixOperatorType)
        {
          case PostfixOperatorType.PLUSPLUS:
          case PostfixOperatorType.MINUSMINUS:
            AnalyzeAssignment(consumer, postfixOperatorExpression, postfixOperatorExpression.Operand);
            break;
        }
      }
    }

foo2.cs

    public void Run(ITreeNode element, ElementProblemAnalyzerData data, IHighlightingConsumer consumer)
    {
      if (element is IPrefixOperatorExpression prefixOperatorExpression)
      {
        switch (prefixOperatorExpression.PrefixOperatorType)
        {
          case PrefixOperatorType.PLUSPLUS:
          case PrefixOperatorType.MINUSMINUS:
          {
            AnalyzeAssignment(consumer, prefixOperatorExpression, prefixOperatorExpression.Operand);
            break;
          }
        }
      }

      if (element is IPostfixOperatorExpression postfixOperatorExpression)
      {
        switch (postfixOperatorExpression.PostfixOperatorType)
        {
          case PostfixOperatorType.PLUSPLUS:
          case PostfixOperatorType.MINUSMINUS:
            AnalyzeAssignment(consumer, postfixOperatorExpression, postfixOperatorExpression.Operand);
            break;
        }
      }
    }