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

[d-bugmail at puremagic.com]

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

--- Comment #1 from hsteoh at quickfur.ath.cx ---
P.S. This bug is causing my otherwise-dip1000-compliant code to no longer
compile, making it impossible to build the code with dip1000 (unless I disable
-unittest, but that's not a practical workaround during development).

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