Bug 20307 – Difference for `deprecated alias a = b` vs. `deprecated alias b a`

Compile this with `-w` (https://run.dlang.io/is/B5ifPu): ``` deprecated ("bla") void foo(); deprecated alias foo f; // 2 deprecation msges deprecated alias g = foo; // no deprecation msg deprecated ("bla") alias foo h; // no deprecation msg either ``` Output: ``` onlineapp.d(3): Deprecation: function `onlineapp.foo` is deprecated - bla onlineapp.d(3): Deprecation: function `onlineapp.foo` is deprecated - bla ``` This is actually adapted from druntime (core.sys.windows.odbcinst). 1) Why is there a difference between `deprecated alias foo f` and `deprecated alias f = foo`? 2) Why does adding a msg make a difference? 3) Why is the deprecation msg printed twice for the same trivial alias declaration?

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

Re 3: I misread the example as using the new alias syntax for `h` but it's using the old one.

This seems to have been fixed. I cannot reproduce the deprecation messages. I get a graceful compilation. Closing as WORKSFORME. Please reopen if I am missing something.