[Issue 18194] hasStaticMember doesn't work with static enum

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18194

--- Comment #1 from FeepingCreature <default_357-line at yahoo.de> ---
static assert(hasMember!(X, "b")) does pass, and b shows up in allMembers and
derivedMembers.

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