From: "Mr. Herr" <misterherr@freenet.de>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Cyclic type abbreviation
Date: Fri, 13 Nov 2015 14:15:01 +0100 [thread overview]
Message-ID: <5645E255.5060900@freenet.de> (raw)
In-Reply-To: <5645DC49.7050106@tu-berlin.de>
On 13.11.2015 13:49, Christoph Höger wrote:
> Dear all,
>
> why is this type cyclic?
>
> type node = int * tree * tree
> and tree = node option
>
> I cannot introduce a manifest for the option type, as there is no Option
> module (why is that, btw?) - so I would assume option to be special
> enough to be handled like any other algebraic data type.
type 'a option = None | Some 'a
no need for a module, just a simple type. Maybe you confound it with other languages.
And cyclic - well, the types are referring to each other.
Summary: what is supposedly wrong with it?
/Str.
next prev parent reply other threads:[~2015-11-13 13:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-13 12:49 Christoph Höger
2015-11-13 13:15 ` Mr. Herr [this message]
2015-11-13 13:37 ` David Allsopp
2015-11-13 13:46 ` Romain Bardou
2015-11-13 14:24 ` Romain Bardou
2015-11-16 5:43 ` Ben Millwood
2015-11-16 16:42 ` peterfrey
2015-11-16 17:08 ` Pierrick Couderc
2015-11-13 13:46 ` Christoph Höger
2015-11-13 13:53 ` Mr. Herr
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