[Issue 20307] Difference for `deprecated alias a = b` vs. `deprecated alias b a`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20307

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |pro.mathias.lang at gmail.com

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
Note that the correct behavior here would be to output no message.
The reasoning is that those alias are deprecated, and *declaring* deprecated
symbols does not trigger a message, only using them.

So the behavior of the old alias syntax is actually what needs to be fixed.
1) I assume they are parsed differently (since the new alias syntax can be a
template declaration)
2) I don't see a difference, both `g` and `h` are not outputting a message,
right ?
3) That's a bug

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