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

[d-bugmail at puremagic.com]

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

John Hall <john.michael.hall at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |john.michael.hall at gmail.com

--- Comment #1 from John Hall <john.michael.hall at gmail.com> ---
Writing
cas(cast(shared)&a, null, cast(shared)b);
also causes an error.

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