[Issue 15086] import doesn't verify module declaration

[d-bugmail at puremagic.com]

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

--- Comment #16 from Andrei Alexandrescu <andrei at erdani.com> ---
The example in which the order of imports makes or breaks the build is
compelling. Even better would be a bug whereby the project builds both ways but
does different things. That would be the smoking gun.

OK to leave this open. At the minimum we must fix the order dependency and make
the spec clearer. Thanks!

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