Placement new and @trusted

[IchorDev]

On Wednesday, 10 September 2025 at 13:13:34 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> Placement new is @system, but you wanted to use it in an @safe 
> function iff the constructor to be called is @safe as well.

Pretty much.

> The reason placement new is @system is because of double-init. 
> It can't be a safe operation.

What?! Like, it assigns to the memory twice? What's the point of 
this feature, then? I thought this could essentially replace 
`emplace` for constructing types into uninitialised memory, but 
instead it's just a booby-trap that stops people from making 
their code `@safe`?