Should alias this support implicit construction in function calls and return statements?

[Adam D. Ruppe]

On Thursday, 13 December 2012 at 14:25:27 UTC, Simen Kjaeraas 
wrote:
>     foo(b); // Cannot implicitly convert byte to bbyte.

I think the way it is now is correct for alias this.. it is kinda 
like implicitly casting to a base class. That's correct, but 
going to a superclass isn't necessarily right. You might only 
want it to be one way. Suppose you had something like this:

struct SafeText {
   string text;
   alias this text;
}

Safe text should implicitly convert to plain string text, but it 
shouldn't go the other way automatically.

> A long time ago, when dinosaurs roamed the earth, 
> walterandrei.pdf[5] suggested that opImplicitCastTo and 
> opImplicitCastFrom take care of this conversion.

A separate function or facility for implicit cast to might be ok 
though.