[Issue 20198] Make std.math.nextUp and nextDown and nextafter work in CTFE for float and double

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20198

Nathan S. <n8sh.secondary at hotmail.com> changed:

           What    |Removed                     |Added
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           See Also|                            |https://issues.dlang.org/sh
                   |                            |ow_bug.cgi?id=21408

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