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From: Arne Ehrlich <arne.ehrlich@groknet.de>
To: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] is this a bug ?
Date: Tue, 9 May 2006 15:47:46 +0200
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Am Dienstag, 9. Mai 2006 15:09 schrieb Christophe Raffalli:
> hello,
>
> --------------------------------
> let f b l = match l with
>    [] | [_] -> 1
>
> | [a;_] | [_;a] when a = b-> 2
> | _ -> 3
>
> let _ =
>    print_int (f 1 [1;2]);
>    print_int (f 1 [2;1]);
>    print_newline ()
> --------------------------------
>
> Do you think this code should have a useless pattern warning and print "23"
> instead of "22" ?
You found an semantic problem in the gramar ^^
or-patterns do not play well with "when"

I think it's a bug in the semantics...