From: David MENTRE <dmentre@linux-france.org>
To: ronniec95@lineone.net
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] type equality help (camlidl related but not directly)
Date: Tue, 23 Dec 2003 17:00:04 +0100 [thread overview]
Message-ID: <87fzfbjzi3.fsf@linux-france.org> (raw)
In-Reply-To: <3FB8EA9C00092F61@mk-cpfrontend-2.mail.uk.tiscali.com> (ronniec95@lineone.net's message of "Tue, 23 Dec 2003 15:49:31 +0000")
Hello,
ronniec95@lineone.net writes:
> type union_9 =
> | NUMERIC
> | STRING
> | TBOOL
> | ENUM_DATA
> | CONTROL
> | ENCRYPT
> and msg_type = union_9
>
> let foo x : msg_type option = x
^^^^^^Here is the trick
> If I try to do
>
> # foo STRING;;
> Characters 4-10:
> foo STRING;;
> ^^^^^^
> This expression has type union_9 but is here used with type msg_type option
You should do :
# foo (Some STRING);;
- : msg_type option = Some STRING
foo is defined as an option (| None | Some of 'a) over msg_type.
Yours,
d.
--
David Mentré <dmentre@linux-france.org>
http://www.linux-france.org/~dmentre/david-mentre-public-key.asc
GnuPG key fingerprint: A7CD 7357 3EC4 1163 745B 7FD3 FB3E AD7C 2A18 BE9E
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next prev parent reply other threads:[~2003-12-23 16:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-23 15:49 ronniec95
2003-12-23 16:00 ` David MENTRE [this message]
2003-12-23 16:12 ` [Caml-list] type equality help - Thanks to all ronniec95
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