a.cs

    [Pure]
    private static bool IsNegativeInfinity([NotNull] ICSharpExpression expression)
    {
      var constantValue = expression.ConstantValue.Value;
      if (constantValue is double)
        return double.IsNegativeInfinity((double) constantValue);
      if (constantValue is float)
        return float.IsNegativeInfinity((float) constantValue);

      return false;
    }

b.cs

    [Pure]
    private static bool IsNegativeInfinity([NotNull] ICSharpExpression expression)
    {
      switch (expression.ConstantValue.Value)
      {
        case double x:
          return double.IsNegativeInfinity(x);
        case float x:
          return float.IsNegativeInfinity(x);
        default:
          return false;
      }
    }

c.cs

    [Pure]
    private static bool IsNegativeInfinity([NotNull] ICSharpExpression expression) =>
      match (expression.ConstantValue.Value)
      {
        case double x => double.IsNegativeInfinity(x);
        case float x => float.IsNegativeInfinity(x);
        default => false;
      };