[Issue 23845] std.math.traits.copysign returns the wrong value

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23845

--- Comment #2 from grylliade at hotmail.com <grylliade at hotmail.com> ---
My pointer syntax is much rustier than I’d realized, so…ignore this. cbrt()
should still be pure, though; a cube root function *not* being pure
is…surprising, at the least.

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