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

[via Digitalmars-d-bugs]

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

--- Comment #5 from bearophile_hugs at eml.cc ---
(In reply to Orvid King from comment #4)

> The issue with doing this is that there are still quite a few syntax
> constructs that the new syntax doesn't currently support, including alias
> this.

Yes, "alias this" is essentially a different syntax, and it will be kept, as
said in the first message of this thread.

What other constructs are a problem for the warn against the old alias syntax?

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