Re: Can't get UDAs of constants (enums) !

[ketmar via Digitalmars-d]

Johan Engelen wrote:

> This code no longer compiles (regression since 2.072, [1]):
> ```
> module example;
> import std.meta: staticIndexOf;
>
> struct Attrib {}
>
> @Attrib enum TEST = 123;
>
> void foo() {
>      foreach(name; __traits(allMembers, example)) {
>          pragma(msg, name);
>          pragma(msg, __traits(getAttributes, __traits(getMember, example, 
> name)));
>      }
> }
> ```
>
> Does anybody know a workaround? (the intent is to loop over all module 
> members that have a certain UDA applied)
> It's currently blocking Weka from updating to a newer compiler. :(
>
> You can play with code live here: https://godbolt.org/g/G8Yw59
> Switch between LDC 1.1.0 (dlang 2.071) and LDC 1.2.0 (dlang 2.072).
>
> Thanks,
>    Johan
>
> [1]  https://issues.dlang.org/show_bug.cgi?id=17545

`std.traits.getSymbolsByUDA()` will allow to select all symbols with the 
given UDA. yet you'll still have `123` instead of a `TEST` as a result.

i'm not sure that this is a real bug, tho: such enums doesn't meant to 
exist as separate entities, they meant to be macro-like, pasting their 
value.

i.e. i myself wont complain, but i may be completely wrong here, and this 
may be a real bug.