From: Andreas Rossberg <rossberg@ps.uni-sb.de>
To: caml-list@inria.fr
Subject: Re: [Caml-list] using arguments insides functors
Date: Tue, 03 Aug 2004 14:42:58 +0200 [thread overview]
Message-ID: <410F8852.30001@ps.uni-sb.de> (raw)
In-Reply-To: <20040803.205025.104127434.keiko@kaba.or.jp>
nakata keiko wrote:
> why the following code does not get type checked ?
>
> module type I =
> sig
> module type T
> end
>
> module F = functor (Elt : I) ->
> struct
> module type T = Elt.T
> module F = functor (Elt : T) ->
> struct
> include Elt
> end
> end
Because "include" only applies to modules that are structures, since it
is meant to copy its fields to the current scope. In your example
however, Elt has some abstract module type T, so it does not meet that
requirement. What should the include mean if you applied the outer F like
F (struct module type T = functor (X : sig end) -> sig end end)
? And how could you express the result type of F without knowing the
structure of Elt?
Cheers,
- Andreas
--
Andreas Rossberg, rossberg@ps.uni-sb.de
Let's get rid of those possible thingies! -- TB
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next prev parent reply other threads:[~2004-08-03 12:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-03 11:50 nakata keiko
2004-08-03 12:42 ` Andreas Rossberg [this message]
2004-08-03 13:01 ` nakata keiko
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