[Issue 20905] An alias inside a static if results in an undefined identifier in some situations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20905

--- Comment #1 from KytoDragon <kytodragon at e.mail.de> ---
I changed the importance to major since if you import the file that contains
the static if this can't even be fixed by reordering symbols/imports.

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