UDAs on enum members

[Tomer Filiba via Digitalmars-d]

On Wednesday, 13 July 2016 at 12:54:19 UTC, ketmar wrote:
> 2OP: to create enum from string, you can use `std.conv.to`:
>   enum E { A, B, C }
>   E v = to!E("A");

I obviously failed to convey the purpose. I don't need a string 
representation of the enum member, I want to be able to attach 
UDAs to members. The second part, about Java-like enums, was just 
an thought. Scratch that.

Right now, I have this real code:

enum Severity: ubyte {
     INFO, WARNING, MINOR, MAJOR, CRITICAL
}
@notrace string severityToString(Severity sev) {
     final switch (sev) with (Severity) {
         case INFO:      return "INF";
         case WARNING:   return "WRN";
         case MINOR:     return "MNR";
         case MAJOR:     return "MJR";
         case CRITICAL:  return "CRT";
     }
}
@notrace Severity stringToSeverity(string sev) {
     switch (sev) with (Severity) {
         case "INF":  return INFO;
         case "WRN":  return WARNING;
         case "MNR":  return MINOR;
         case "MJR":  return MAJOR;
         case "CRT":  return CRITICAL;
         default:     return WARNING;
     }
}

If I could attach UDAs to the enum members', I could just 
auto-generate that stuff. That's all I'm asking for. The purpose 
of having a short name is for compression -- this text is going 
to be stored a lot, and I don't want to store the value, because 
(a) I don't care what value is assigned to each and (b) users 
might add new members, anywhere in the enum, causing the values 
to be remapped.

In other words, I don't want

enum Severity: ubyte {
     INFO, MINOR, MAJOR, WARNING, CRITICAL
}

to break the data I already have

-tomer