Setting up a final switch from a list

[Cecil Ward]

Am I right in thinking that final switch can be used to check 
that all the elements in an enum are handled in cases? Thinking 
that this is a worthwhile safety check, I’d like to convert an 
existing list into an enum for use in a final switch. I have an 
existing list which I use elsewhere,
    enum terminators = [ '%', ':', '?' ];

I pass that to some routine. I am wondering how to safely create 
either an enum with values or have the enum with values declared 
first and then create the list from it. That is, maybe start the 
other way around
  enum terminators_t = { percent = '%', colon = ':', qmark = '?' };
and then automatically generate the list from that. The idea is 
to avoid duplication in the array list and enum value list, so 
that if I ever add one, I will not be able to update the other to 
match.

Any suggestions? I need some good compile-time stuff. It doesn’t 
matter which direction we go in, from one to the other, but my 
money is on the all-values enum generating the array list.