From: "Chris King" <colanderman@gmail.com>
To: "Alain Frisch" <Alain.Frisch@inria.fr>
Cc: "O'Caml Mailing List" <caml-list@inria.fr>
Subject: Re: [Caml-list] Unexpected '_a problem
Date: Wed, 2 Aug 2006 13:57:47 -0400 [thread overview]
Message-ID: <875c7e070608021057rfb89914x1d6b9c6e7e4d7ce0@mail.gmail.com> (raw)
In-Reply-To: <44D04D83.5020503@inria.fr>
On 8/2/06, Alain Frisch <Alain.Frisch@inria.fr> wrote:
> See the paper _Relaxing the value restriction_ by Jacques Garrigue (
> http://wwwfun.kurims.kyoto-u.ac.jp/~garrigue/papers/morepoly-long.pdf
> ), page 15: dangerous type variables (which are not generalized when the
> right-hand side of the let-binding is not a value) are not only those is
> contravariant position - this would be enough to ensure type soundness -
> but also those which appear in a contravariant branch (e.g. anywhere on
> the left of an arrow) - this is necessary to ensure that the type system
> has principal types.
Okay, that (and Christophe's explanation) explains why hiding
everything in a module works. Thanks everyone for your help! It
seems I will have to use Obj.magic to get the type I want but at least
its use in this situation seems both safe and warranted.
- Chris
next prev parent reply other threads:[~2006-08-02 17:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 20:47 Chris King
2006-08-01 21:20 ` [Caml-list] " Andreas Rossberg
2006-08-01 22:09 ` Remi Vanicat
2006-08-02 7:00 ` Alain Frisch
2006-08-02 17:57 ` Chris King [this message]
2006-08-04 2:42 ` Jacques Garrigue
2006-08-04 14:18 ` Chris King
2006-08-02 7:03 ` Christophe Dehlinger
2006-08-02 8:07 ` Andreas Rossberg
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