Multiple alias this, what's the hold up?

[Les De Ridder]

On Tuesday, 18 June 2019 at 22:51:51 UTC, Jonathan M Davis wrote:
> [...]
>
> I expect that it's perfectly safe to remove mentioning multiple 
> alias this-es from your book and that it would give a far more 
> accurate representation of the state of D. Acting like it's 
> just a matter of time before multiple alias this-es get added 
> to D would be giving folks the wrong idea with how things 
> stand. And if someone actually comes up with a proposal that 
> convinces Walter, it's not like it would be hard to grab what 
> you had and re-add it with any necessary changes (at least if 
> you have your book in source control like I would think you 
> would).
>
> [...]

If that's indeed the case it should probably be removed from the
spec[1] as well.

[1] https://dlang.org/spec/class.html#alias-this (subsection 7)