The Joy of Signalling NaNs! (A compiler patch)

[Mason Green]

Don wrote:
> Yup, I've had many NaN nightmares. Whenever you have an uninitialized 
> variable in C++ there's about a 1% chance that it's a NaN. That's really 
> fun to track down. NOT.
> I think it's criminal that this feature has been in hardware since *** 
> 1980 *** and not made available even in systems languages.

I second adding this feature to D.  I've spent many, many hours chasing 
NaN bugs when porting box2d from c++.  Most of the time, it came down to 
simply forgetting to initialize a float somewhere. I actually make a 
post on dsource a few days ago:

http://www.dsource.org/forums/viewtopic.php?t=4501&sid=2e8f71e52efbcece43a63cbb261e8706