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

[via Digitalmars-d-bugs]

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

--- Comment #17 from bearophile_hugs at eml.cc ---
(In reply to yebblies from comment #16)

> I disagree.  Don't break all of my old code for no reason.

There is a reason, to remove dead wood, and reduce the number of different ways
to do something in D, making the language more lean. The question is if this
outweighs the costs of changing code. I think the balance is still for
deprecating unnecessary parts.

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