From: "Jon Harrop" <jon@ffconsultancy.com>
To: "'Andrew'" <newsgroups.fr@gmail.com>, <caml-list@inria.fr>
Subject: RE: [Caml-list] Comparing variant types
Date: Fri, 29 Apr 2011 13:15:38 +0100 [thread overview]
Message-ID: <004d01cc0667$277503c0$765f0b40$@ffconsultancy.com> (raw)
In-Reply-To: <4DBA98D8.5020605@gmail.com>
Andrew wrote:
> Why not write directly
> let dir_equal = fun d1 d2 ->
> | Left Left
> | Right Right
> | Up Up
> | Down Down
> | No_op No_op -> true
> | _ -> false
You want to fill out your _ pattern with explicit type constructors
otherwise it is fragile wrt new constructors being added to the type.
Cheers,
Jon.
next prev parent reply other threads:[~2011-04-29 12:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-28 19:16 Ethan Burns
2011-04-28 21:07 ` Vincent Aravantinos
2011-04-28 22:56 ` Ethan Burns
[not found] ` <354087020.772283.1304031467793.JavaMail.root@zmbs4.inria.fr>
2011-04-29 8:46 ` Fabrice Le Fessant
2011-04-29 8:57 ` Dmitry Bely
[not found] ` <164004794.892685.1304067487325.JavaMail.root@zmbs2.inria.fr>
2011-04-29 9:33 ` luc.maranget
2011-04-29 10:54 ` Andrew
2011-04-29 11:17 ` Dmitry Bely
2011-04-29 12:15 ` Jon Harrop [this message]
2011-04-30 16:38 ` Andrew
2011-04-29 11:32 ` Dmitry Bely
2011-04-30 13:43 ` craff73
2011-04-30 19:26 ` Andrew
2011-04-30 20:19 ` Gabriel Scherer
2011-04-30 20:57 ` Yaron Minsky
[not found] <fa.FGXk5PCsQgS8TidmFkgljpqbLZo@ifi.uio.no>
2011-04-29 11:54 ` Ethan Burns
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