[Issue 13291] unittest should be allowed inside template functions

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13291

--- Comment #3 from Andrei Alexandrescu <andrei at erdani.com> ---
Honest I did think of the template/eponymous trick but was too lazy to open it
for discussion... there would be issues of overloading etc. left to solve with
that one.

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