From: Romain Bardou <Romain.Bardou@lri.fr>
To: Richard Jones <rich@annexia.org>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Question about type unification
Date: Mon, 26 May 2008 14:37:32 +0200 [thread overview]
Message-ID: <483AAF0C.7060500@lri.fr> (raw)
In-Reply-To: <20080526122204.GA6727@annexia.org>
Richard Jones a écrit :
> With this definition:
>
> type 'a t = float
>
> Why is this allowed?
>
> # ((3.0 : unit t) : string t) ;;
> - : string t = 3.
>
> Note that unification is prevented if t is opaque, eg, hidden behind a
> module signature.
>
> Rich.
>
My guess is that 'a t being just a type abbreviation, it is expanded to
float when unifying. Private types are not type abbreviations, so they
can't be expanded.
--
Romain Bardou
next prev parent reply other threads:[~2008-05-26 12:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-26 12:22 Richard Jones
2008-05-26 12:33 ` [Caml-list] " Jon Harrop
2008-05-26 12:37 ` Romain Bardou [this message]
2008-05-26 17:21 ` Fabrice Marchant
2008-05-26 19:29 ` Robert Fischer
2008-05-26 19:38 ` DooMeeR
2008-05-26 19:43 ` Robert Fischer
2008-05-26 19:45 ` Jeremy Yallop
2008-05-26 21:44 ` Richard Jones
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