[Issue 18049] dmd -unittest against a library not compiled with -unittest gives undefined symbols

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18049

--- Comment #3 from Timothee Cour <timothee.cour2 at gmail.com> ---
same error whether we compile as .a, .dylib, or .o

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