[Issue 15086] import doesn't verify module declaration

[d-bugmail at puremagic.com]

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

--- Comment #21 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to ag0aep6g from comment #19)

Thank you for providing a simple and clear test case to illustrate the issue.
It is indeed a problem that the order of imports is mattering, as this breaks a
fundamental tenet of D's import system.

I have not thought about this thoroughly, but I suspect the core of a fix can
be along the lines of detecting that an explicit import of bar.d is done using
two different names in the same module.

This is a lot more focused in effect than the PR.

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