"sebastien FURIC" <sebastien.furic@tni-valiosys.com> writes:

>  Hi,
>
>  What do you think of the following code?
>
> # type toto = Toto of int | Titi of string;;
> type toto = Toto of int | Titi of string
> # let test t t' = match t, t' with
>   | ((Toto _ | Titi _), Toto x | Toto x, (Toto _ | Titi _)) when x = 0
> -> "OK"
>   | _ -> "KO";;
> Characters 73-79:
> Warning: this pattern is unused.
>   | ((Toto _ | Titi _), Toto x | Toto x, (Toto _ | Titi _)) when x = 0
> -> "OK"
>                                           ^^^^^^

I can't answer to your question, but with your example, one can do a: 

# let test t t' = match t, t' with
  | ((Toto _ | Titi _), Toto 0
  | Toto 0, (Toto _ | Titi _)) when x = 0 -> "OK"
  | _ -> "KO";;

of course, this is not generalizable to any test.

-- 
Rémi Vanicat

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