[Issue 18517] Import order is not invariant

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18517

--- Comment #1 from Jonathan Marler <johnnymarler at gmail.com> ---
Added 2 tests to dmd for this bug here: https://github.com/dlang/dmd/pull/8165
but the PR was rejected. Razvan doesn't think tests should be pushed to dmd by
themselves (without their corresponding fixes).

> Razvan: I don't see much benefit in having tests that don't pass in the test suite. This puts a burden on the autotester and encourages people to make PRs just with tests creating a separation between the fix and the test.

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