Help in reviewing druntime PR

[Paul Backus]

On Thursday, 9 December 2021 at 15:52:46 UTC, Stanislav Blinov 
wrote:
>
> This shan't be in Phobos, it needs to be in druntime. At the 
> moment we have the whole gang of emplace, move, etc. duplicated 
> between the two :\ These things need to reside in 
> `core.lifetime` and threabout, usable without Phobos. Phobos 
> could public alias if need be, but certainly not the other way 
> around :)

Yes, of course; I assumed that went without saying. My point is: 
we probably do not want to have duplicate implementations of this 
in two different places with slightly different behavior--which 
is where we're currently headed.