From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: christophe.raffalli@univ-savoie.fr
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] polymorphic variants and promotion
Date: Wed, 20 Feb 2008 13:50:02 +0900 (JST) [thread overview]
Message-ID: <20080220.135002.71088204.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <47BB5791.4020606@univ-savoie.fr>
From: Christophe Raffalli <christophe.raffalli@univ-savoie.fr>
> Keiko Nakata a écrit :
> > indeed we need to use double coercion, instead of single:
> >
> > # ((`A 1 : [ `A of int ]) : [ `A of int ] :> [> `A of int ]);;
> > - : [> `A of int ] = `A 1
> > # ((`A 1 : [ `A of int ]) :> [> `A of int ]);;
> > - : [ `A of int ] = `A 1
> >
> >
> To me this looks like a bug ? Should not we always have that "e :> t"
> has type "t" (if it typechecks) ?
No, it should have type "an instance of t", like for all type
annotations in ocaml. And [`A of int] happens to be an instance of
[> `A of int].
Jacques Garrigue
next prev parent reply other threads:[~2008-02-20 4:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-19 10:23 Johannes Kanig
2008-02-19 12:38 ` [Caml-list] " Julien Signoles
2008-02-19 13:37 ` Keiko Nakata
2008-02-19 22:26 ` Christophe Raffalli
2008-02-20 4:50 ` Jacques Garrigue [this message]
2008-02-19 12:48 ` Remi Vanicat
2008-02-20 5:01 ` [Caml-list] " Jacques Garrigue
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