From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: sacerdot@cs.unibo.it
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Recursive classes and subtyping
Date: Mon, 04 Feb 2002 11:30:25 +0900 [thread overview]
Message-ID: <20020204113025C.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <20020201182057.C5484@cs.unibo.it>
From: Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>
> Obviously, I was a bit too quick! I think that the trick works only up to
> the point where the mutual recursion is fake. This is a slightly more
> complex example:
>
> # type -'a t;;
>
> # let f (x : [> `A] t) = (x : [`A] t);;
> val f : [ `A] t -> [ `A] t = <fun>
If you just put two annotations, they will be unified.
You need an explicit coercion to get the type you expect:
# let f x = (x : [> `A] t :> [`A] t);;
val f : [> `A] t -> [ `A] t = <fun>
Jacques Garrigue
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prev parent reply other threads:[~2002-02-04 2:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-01 12:17 Frederic Tronel
2002-02-01 13:34 ` Jerome Vouillon
2002-02-01 13:42 ` Frederic Tronel
2002-02-01 14:55 ` Claudio Sacerdoti Coen
2002-02-01 15:12 ` Claudio Sacerdoti Coen
2002-02-01 16:41 ` Laurent Vibert
2002-02-01 17:01 ` Claudio Sacerdoti Coen
2002-02-01 17:20 ` Claudio Sacerdoti Coen
2002-02-04 2:30 ` Jacques Garrigue [this message]
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