RfC for language feature: rvalue struct

[Dukc]

On Wednesday, 25 January 2023 at 16:23:51 UTC, FeepingCreature 
wrote:
> Before I take on the effort of writing up and submitting a DIP, 
> let me solicit feedback and see if anyone can see a reason why 
> this idea is dumb and doesn't work.
>
> tl;dr: `immutable struct` was a mistake: it's too weak. `rvalue 
> struct` is what we really want.

Isn't this what private/`@system` (DIP1035) fields with 
public/`@trusted` getter functions are for?