[Issue 12615] Warn against, and then deprecate old alias syntax

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12615

Mike Franklin <slavo5150 at yahoo.com> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|WONTFIX                     |---

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