Re: UDAs on Enum Members: Does it require a DIP?

[Michael V. Franklin via Digitalmars-d]

On Sunday, 19 November 2017 at 15:57:58 UTC, Jonathan M Davis 
wrote:

It isn't specific to UDAs. You can't put _any_ attributes on 
enums - including something like deprecated (though to be fair, 
not many attributes would make sense on an enum member).

https://issues.dlang.org/show_bug.cgi?id=9395

Indeed.  That precise use case showed up recently in this PR:  
https://github.com/dlang/dmd/pull/7303/files

Mike