Challenge: write a reference counted slice that works as much as possible like a built-in slice

[Andrei Alexandrescu]

On 2021-11-08 19:44, deadalnix wrote:
> On Monday, 8 November 2021 at 22:38:27 UTC, Andrei Alexandrescu wrote:
>>> I believe 4 and 5 to be impossible in D right now, 6 can be solved 
>>> using a ton of runtime checks.
>>
>> To which I say, stop posting, start coding.
> 
> As I said, I believe 4 and 5 to be impossible at the moment.

Do 1, 2, and 3.