switch2.cs

after.cs

      private void RenderCaseLabel(
        [NotNull] ICSharpExpression conditionExpression, [NotNull] ISwitchCaseLabel switchCaseLabel,
        ref FactoryArgumentsBuilder builder, bool expressionIsPartOfDisjunction)
      {
        var guardClause = switchCaseLabel.Guard;

        var emitParentheses = expressionIsPartOfDisjunction || (guardClause != null && guardClause.Condition != null);
        if (emitParentheses) builder.Append('(');

        switch (switchCaseLabel.Pattern)
        {
          case IConstantPattern constantPattern:
            builder.Argument(conditionExpression).Append("==").Argument(constantPattern.Expression);
            break;
            
          case IDeclarationPattern declarationPattern:
            builder.Argument(conditionExpression).Append(" is ").Argument(declarationPattern);
            break;
            
          default:
            throw new ArgumentException(string.Format("Not supported pattern kind: {0}", pattern.GetType().Name));
        }

        if (emitParentheses) builder.Append(')');
      }

before.cs

      private void RenderCaseLabel(
        [NotNull] ICSharpExpression conditionExpression, [NotNull] ISwitchCaseLabel switchCaseLabel,
        ref FactoryArgumentsBuilder builder, bool expressionIsPartOfDisjunction)
      {
        var guardClause = switchCaseLabel.Guard;

        var emitParentheses = expressionIsPartOfDisjunction || (guardClause != null && guardClause.Condition != null);
        if (emitParentheses) builder.Append('(');

        var pattern = switchCaseLabel.Pattern;

        var constantPattern = pattern as IConstantPattern;
        if (constantPattern != null)
        {
          builder.Argument(conditionExpression).Append("==").Argument(constantPattern.Expression);
        }
        else
        {
          var declarationPattern = pattern as IDeclarationPattern;
          if (declarationPattern != null)
          {
            builder.Argument(conditionExpression).Append(" is ").Argument(declarationPattern);
          }
          else
          {
            throw new ArgumentException(string.Format("Not supported pattern kind: {0}", pattern.GetType().Name));
          }
        }

        if (emitParentheses) builder.Append(')');
      }