Deprecating this(this)

[Kagamin]

On Saturday, 31 March 2018 at 23:38:06 UTC, Andrei Alexandrescu 
wrote:
> * should work with mutable, const, immutable, and shared

The problem is that postblit is not overloadable, so make it 
overloadable, and problems with overloading will be solved.

> * immutable and const are very difficult, but we have an attack 
> (assuming copy construction gets taken care of)

Collections must be filled somehow, so they are inherently 
mutable, immutable collections need a whole different design 
approach, it doesn't look specific to postblit.

> * pure is difficult

Purity depends on written code. Running impure code in copy 
constructor won't make it pure.