[Issue 13394] invariant fail to link since 2.066 when using separate compilation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13394

--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> ---
(In reply to deadalnix from comment #2)
> That is interesting. Do you know why the import alter the behavior of DMD ?

In my Windows environment, importing std.utf in a.d was unnecessary to
reproduce the link-failure.

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