From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Lazy.Value
Date: Mon, 28 May 2001 15:16:01 +0200 [thread overview]
Message-ID: <20010528151601.B21783@pauillac.inria.fr> (raw)
In-Reply-To: <20010528150725.H13297@verdot.inria.fr>; from daniel.de_rauglaudre@inria.fr on Mon, May 28, 2001 at 03:07:25PM +0200
> > No, this would be unsound -- like all polymorphic references.
>
> I know, and I knew perfectly your example, but for Lazy, it is
> different. The structure of this type is visible only because it is
> necessary for the "lazy" statement. Users are not supposed to change
> the reference value by hand.
OK, I see what you mean. If "lazy e" had a special typing rule and a
special compilation rule -- instead of being expanded into
"ref (Lazy.Delayed (fun () -> e))" during parsing -- then it would be
safe to treat it as generalizable, indeed.
- Xavier Leroy
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next prev parent reply other threads:[~2001-05-28 13:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-05-28 12:46 Daniel de Rauglaudre
2001-05-28 12:53 ` Xavier Leroy
2001-05-28 13:07 ` Daniel de Rauglaudre
2001-05-28 13:16 ` Xavier Leroy [this message]
2001-05-28 13:43 ` Daniel de Rauglaudre
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