[Issue 21562] Allow mixin template declarations without parentheses

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21562

Bolpat <qs.il.paperinik at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |qs.il.paperinik at gmail.com

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