D const design rationale

[Walter Bright]

Sean Kelly wrote:
> Yeah, I don't care if the compiler does it now, only that the potential 
> is there.  After all, this discussion is about the design, not the 
> implementation.

There's quite a bit of unrealized potential for better code right now.

> Thanks for explaining things.  I'm coming to understand the reasoning 
> behind the design you've chosen.

Only time will tell if we screwed it up or not, but there is reasoning 
behind it <g>.