[Issue 1721] std.math.nextafter should be backported to D1 Phobos

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1721





------- Comment #4 from wbaxter at gmail.com  2007-12-09 19:04 -------
Yeh, you're right.  That does look kind of sucky.

Actually I don't even see how something like "float via real" even works.  The
difference between x and nextafter x in 80-bit precision should be zilch in
single precision.  So probably the grid is more like:

         windows  linux
float      yes      no (incorrect output implicitly generated via real)
double     yes      no (incorrect output implicitly generated via real)
real       no       yes

And if I'm right that those linux 'no's are just silently generating incorrect
answers, then it seems reasonable to fix those and make the table:

         windows  linux
float      yes      yes
double     yes      yes
real       no       yes


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