Deprecating this(this)

[ag0aep6g]

On Sunday, 1 April 2018 at 13:37:43 UTC, Jonathan M Davis wrote:
> One issue is that postblit constructors fundamentally don't 
> work with const. The problem is that a postblit constructor 
> works by copying the object and _then_ mutating it, and you 
> can't mutate a const object.

I'm not so sure if that's fundamental. Can't we just say that the 
copy is head-mutable at the time when the postblit function is 
called, and it only becomes fully const after that?

The destination can't be const/immutable already, or you wouldn't 
be able to write there anyway.