The Joy of Signalling NaNs! (A compiler patch)

[Andrei Alexandrescu]

Don wrote:
> It's great that D initializes floating-point variables to NaN, instead 
> of whatever random garbage happened to be in RAM.
> But, if your calculation ends up with a NaN, you have to work out where 
> it came from. Worse, the NaN might not necessarily
> be visible in your final results, but you results may nonetheless be wrong.

[...]

> I propose that this should become part of DMD. It doesn't need to be in 
> the spec, it's primarily for debugging.

That's terrific, Don. I've been bitten by NaNs in calculations many 
times. This would be an excellent improvement to D.

Andrei