From: Laurent Vibert <lvibert@irisa.fr>
To: Patrick M Doane <patrick@watson.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Polymorphic variant abbreviations
Date: Wed, 19 Sep 2001 10:37:20 +0200 (MET DST) [thread overview]
Message-ID: <Pine.GSO.4.21.0109191005140.444-100000@mushroom.irisa.fr> (raw)
In-Reply-To: <Pine.BSF.3.96.1010918195012.58189B-100000@fledge.watson.org>
On Tue, 18 Sep 2001, Patrick M Doane wrote:
> (* The first works as I would expect, the second gives a very unexpected
> type. There seems to be some kind of unexpected unification going on
> between terms. *)
>
> let h1 (#b as x1) (#c as x2) = `A [x1; x2]
here #b is a pattern, it is the same as
let h1 (`B as x1) (`C as x2) = `A [x1; x2]
> let h2 (x1 : #b) (x2 : #c) = `A [x1; x2]
but here it is a type expression, and is the same as
let h2 (x1 : [< `B]) (x2 : [< `C]) = `A [x1; x2]
and in a list, all argument must have the same type, tou take the
intersection of both and obtain [ ]
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next prev parent reply other threads:[~2001-09-19 8:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-18 22:48 Patrick M Doane
2001-09-19 0:05 ` Patrick M Doane
2001-09-19 8:37 ` Laurent Vibert [this message]
2001-09-19 8:56 ` Remi VANICAT
2001-09-19 8:01 ` Laurent Vibert
2001-09-19 16:35 ` Patrick M Doane
2001-09-19 12:45 ` Jacques Garrigue
2001-09-19 16:58 ` Patrick M Doane
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