[Issue 17961] std.uni does not compile with -unittest -dip1000

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17961

--- Comment #3 from hsteoh at quickfur.ath.cx ---
P.S., this bug pertains to Phobos git HEAD, not to any release (that I'm aware
of).

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