[Issue 20359] core.atomic.cas throws with null as `ifThis`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20359

--- Comment #3 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Jesse, looking at those logs, looks like it has something to do with the ddox
publishing. I'm not sure exactly why every job is trying to publish the
documentation, I'll have to take a look.

But I think we worked around this issue already in the io package.

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