Implementing tail-const in D

[sarn]

On Tuesday, 23 January 2018 at 09:36:03 UTC, Simen Kjærås wrote:
> Since tail-const (more correctly called head-mutable) was 
> mentioned here lately (in the 'I closed a very old bug!'[1] 
> thread), I've been racking my brain to figure out what needs 
> doing to make a viable solution.

Have you seen Rebindable in Phobos?  I know it's not the same 
thing as what you're talking about, but it's relevant.
https://dlang.org/library/std/typecons/rebindable.html