while (true)
    {
        if (index == array.Length)
        {
            return deserializedOpt;
        }
        if (index > array.Length)
        {
            return null;
        }
        if (deserializedOpt == null)
        {
            break;
        }
        FSharpOption<FSharpList<Command>> val = deserializedOpt;
        FSharpList<Command> value = val.get_Value();
        switch (array[index])
        {
        default:
            return null;
        case 192:
        {
            FSharpOption<FSharpList<Command>> obj6 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(Command.Drop, value));
            int num13 = index + 1;
            array = array;
            index = num13;
            deserializedOpt = obj6;
            break;
        }
        case 154:
        {
            FSharpOption<FSharpList<Command>> obj3 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(Command.Print, value));
            int num3 = index + 1;
            array = array;
            index = num3;
            deserializedOpt = obj3;
            break;
        }
        case 146:
        {
            FSharpOption<FSharpList<Command>> obj7 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(Command.Add, value));
            int num14 = index + 1;
            array = array;
            index = num14;
            deserializedOpt = obj7;
            break;
        }
        case 123:
        {
            FSharpOption<FSharpList<Command>> obj4 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(Command.Concat, value));
            int num4 = index + 1;
            array = array;
            index = num4;
            deserializedOpt = obj4;
            break;
        }
        case 105:
        {
            FSharpOption<int> val2 = tryFindIndexSince(index + 1, new terminationIndex@66(), array);
            if (val2 == null)
            {
                return null;
            }
            FSharpOption<int> val3 = val2;
            int value2 = val3.get_Value();
            Encoding aSCII = Encoding.ASCII;
            int num5 = index + 1;
            int num6 = value2 - 1;
            int num7 = array.Length;
            int num8 = num6 - num5 + 1;
            int num9 = (num8 >= 0) ? num8 : 0;
            byte[] array2 = new byte[num9];
            Encoding encoding = aSCII;
            int num10 = 0;
            int num11 = num9 - 1;
            if (num11 >= num10)
            {
                do
                {
                    array2[num10] = array[num5 + num10];
                    num10++;
                }
                while (num10 != num11 + 1);
            }
            string @string = encoding.GetString(array2);
            Command command = Command.NewLoadString(@string);
            FSharpOption<FSharpList<Command>> obj5 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(command, value));
            int num12 = value2 + 1;
            array = array;
            index = num12;
            deserializedOpt = obj5;
            break;
        }
        case 101:
        {
            if (index + 4 >= array.Length)
            {
                return null;
            }
            Command command = Command.NewLoadInt(BitConverter.ToInt32(array, index + 1));
            FSharpOption<FSharpList<Command>> obj2 = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(command, value));
            int num2 = index + 5;
            array = array;
            index = num2;
            deserializedOpt = obj2;
            break;
        }
        case 11:
        {
            FSharpOption<FSharpList<Command>> obj = FSharpOption<FSharpList<Command>>.Some(FSharpList<Command>.Cons(Command.Return, value));
            int num = index + 1;
            array = array;
            index = num;
            deserializedOpt = obj;
            break;
        }
        }
    }
    return null;