From: Christophe Raffalli <christophe.raffalli@univ-savoie.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Difference between [ `A ] and [< `A ]
Date: Wed, 11 May 2011 17:47:32 +0200 [thread overview]
Message-ID: <4DCAAF94.8010206@univ-savoie.fr> (raw)
In-Reply-To: <35C81D78-50FE-47D2-93E2-F48FF4AEED3F@math.nagoya-u.ac.jp>
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> For instance, [< `A of int] and [< `A of bool] are unifiable, giving [< `A of int & bool],
OK ... this means you can write (I tested in 3.11.2) :
# type ('a,'b,'c) inter = [< `A of 'b & 'c] as 'a;;
type ('a, 'b, 'c) inter = 'a constraint 'a = [< `A of 'b & 'c ]
which seems to be a type isomorphic to the intersection type of 'b and 'c ...
does this mean we can play with intersection type in OCaml (using some type cast because
intersection type is undecidable ...)
In other word : can we encode system D in OCaml ?
Cheers,
Christophe
--
Christophe Raffalli
Universite de Savoie
Batiment Le Chablais, bureau 21
73376 Le Bourget-du-Lac Cedex
tel: (33) 4 79 75 81 03
fax: (33) 4 79 75 87 42
mail: Christophe.Raffalli@univ-savoie.fr
www: http://www.lama.univ-savoie.fr/~RAFFALLI
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prev parent reply other threads:[~2011-05-11 15:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-10 16:46 Dario Teixeira
2011-05-10 23:44 ` Jacques Garrigue
2011-05-11 15:47 ` Christophe Raffalli [this message]
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