First Draft: Placement New Expression

[Nick Treleaven]

On Thursday, 31 October 2024 at 06:23:24 UTC, Walter Bright wrote:
> Based on a suggestion by Manu Evans:
>
> https://github.com/WalterBright/documents/blob/5d65426a4e5c434d571e76ae800a267a610bf394/placementnew.md

> With the placement new expression, operator new can initialize 
> an object into any location. It replaces the functionality of 
> core.lifetime.emplace.

It would be good if any DIP that replaces `emplace` could avoid 
violation of immutable data in @system code, or at least in @safe:
https://issues.dlang.org/show_bug.cgi?id=24795