GDC with later DMD's

[Gregor Richards]

Gregor Richards wrote:
> Unfortunately, I've found several funky bugs with my patch, so I'm going 
> to do a much more careful incremental patch, using a few real test 
> programs that are known to fail.  See if I can avoid doing that again :)
> 
>  - Gregor Richards

One bug came up in the 147-148 change.  Likely by no coincidence, this 
is also when the bit->bool change came into effect.

I've posted the working 147 and broken 148 patches to the D Journal:

http://www.tdjonline.com/?page_id=11

  - Gregor Richards

PS: Anders: Once I get back to 156, I'll integrate your patches.  Don't 
want to make the increments too complicated, sorry :)