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

[deadalnix]

On Monday, 8 November 2021 at 22:40:03 UTC, Andrei Alexandrescu 
wrote:
> On 2021-11-08 17:26, rikki cattermole wrote:
>> a reference counted struct should never be const
>
> So then we're toast. If that's the case we're looking at the 
> most important challenge to the D language right now.

Not necessarily, but this is in fact the same problem as the head 
mutable problem.

If `const RCSlice!(const T)` can convert to `RCSlice!(const T)`, 
which it should to have the same semantic as slice.

The reference counting problem goes away if you can mutate the 
head.