[Issue 21500] public import in mixin template in module a fails when module b imports a.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21500

noobnoobsai at gmail.com changed:

           What    |Removed                     |Added
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            Summary|public import in mixin      |public import in mixin
                   |template in module a fails  |template in module a fails
                   |when module b import sa.    |when module b imports a.

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