[Issue 12298] Templates can be used in mixin even when not declared as mixin template

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12298

--- Comment #2 from RazvanN <razvan.nitu1305 at gmail.com> ---
*** Issue 16025 has been marked as a duplicate of this issue. ***

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