Making enum join variadic

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On Friday, 2 May 2014 at 13:38:39 UTC, Nordlöw wrote:
> enums.d(25,46): Error: static variable allMembers cannot be 
> read at compile time
> enums.d(25,21):        while evaluating: static assert("a" in 
> allMembers)
>
> Is there a solution to this problem?

Associative arrays are not CTFE-able.