[Issue 15086] import doesn't verify module declaration

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15086

--- Comment #17 from Jonathan Marler <johnnymarler at gmail.com> ---
I was able to reproduce Timothee's example.  The error only occurs if the
modules are specified in a particular order.

I also tested this using PR
(https://github.com/dlang/dmd/pull/7878#issuecomment-365364824) and confirmed
that it will assert an error in both cases regardless of the order the imports
appear in.

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