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

[d-bugmail at puremagic.com]

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

anonymous4 <dfj1esp02 at sneakemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |spec
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #19 from anonymous4 <dfj1esp02 at sneakemail.com> ---
I think, this is controversial after all.
1. alias this does use C syntax, so deprecation would contradict it -
effectively kills this request
2. there was an argument for brevity in D, so multiple alias declaration can be
seen as an asset
3. dscanner can check code style for those who really want it

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