csharp7.cs

    [Pure]
    public static bool CanRemoveDesignation([NotNull] this IRecursivePattern recursivePattern)
    {
      if (recursivePattern.TypeUsage == null && recursivePattern.PropertyPatternClause == null)
      {
        var deconstructionPatternClause = recursivePattern.DeconstructionPatternClause;
        if (deconstructionPatternClause != null)
        {
          if (deconstructionPatternClause.Patterns.Count == 1) return false;
        }
      }

      return !recursivePattern.ContainsPreprocessorDirectiveChildren();
    }

csharp8.cs

    [Pure]
    public static bool CanRemoveDesignation([NotNull] this IRecursivePattern recursivePattern)
    {
      if (recursivePattern is {
            TypeUsage: null,
            PropertyPatternClause: null,
            DeconstructionPatternClause: { Patterns: { Count: 1 } }
          })
      {
        return false;
      }

      return !recursivePattern.ContainsPreprocessorDirectiveChildren();
    }