[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 #6 from Timothee Cour <timothee.cour2 at gmail.com> ---
confirmed that adding -allinst works (both with dmd and ldc), but indeed, this
should be fixed.

question: what are downsides of -allinst?

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