[Issue 15086] import doesn't verify module declaration

[d-bugmail at puremagic.com]

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

--- Comment #15 from Timothee Cour <timothee.cour2 at gmail.com> ---
the example I just posted breaks this spec:

> The order in which ImportDeclarations occur has no significance.

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