after.cs

    public static bool IsInContantContext([NotNull] this ITreeNode context)
    {
      foreach (var containingNode in context.ContainingNodes())
      {
        switch (containingNode)
        {
          case IAttribute attribute:
          case IConstantDeclaration constant:
          case ILocalConstantDeclaration localConstant:
          case IEnumMemberDeclaration enumMember:
          case ISwitchLabelStatement switchLabel:
          case IGotoCaseStatement gotoCase:
            return true;

          case IInterpolatedStringInsert insert:
            var alignmentExpression = insert.AlignmentExpression;
            if (alignmentExpression != null && alignmentExpression.Contains(context))
              return true;
            break;
        }
      }

      return false;
    }

before.cs

    public static bool IsInContantContext([NotNull] this ITreeNode context)
    {
      foreach (var containingNode in context.ContainingNodes())
      {
        if (containingNode is IAttribute) return true;
        if (containingNode is IConstantDeclaration) return true;
        if (containingNode is ILocalConstantDeclaration) return true;
        if (containingNode is IEnumMemberDeclaration) return true;
        if (containingNode is ISwitchLabelStatement) return true;
        if (containingNode is IGotoCaseStatement) return true;

        var interpolatedStringInsert = containingNode as IInterpolatedStringInsert;
        if (interpolatedStringInsert != null)
        {
          var alignmentExpression = interpolatedStringInsert.AlignmentExpression;
          if (alignmentExpression != null && alignmentExpression.Contains(context))
          {
            return true;
          }
        }
      }

      return false;
    }