[m-users.] Multi predicate of entire enum

[Ace]

So say I have some enum:

`:- type ex ---> a; b; c.`

And I want to generate a function similar to:

```
:- pred ex_mul(ex::out) is multi.
ex_mul(a).
ex_mul(b).
ex_mul(c).
```

Any kind of standard library predicate I can use so I don't have to add a
new case to the predicate for every instance of the enum?
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