From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: alex@baretta.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Typechecking madness
Date: Wed, 03 Mar 2004 17:16:27 +0900 [thread overview]
Message-ID: <20040303171627X.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <40434623.6040100@baretta.com>
From: Alex Baretta <alex@baretta.com>
> I'm sure the typechecker knows what he's doing, but the following error
> message does look strange.
>
> This expression has type
> 'a. (('a Pxp_document.node #Pxp_document.extension as 'a) -> unit) ->
> unit
> but is here used with type
> 'b. (('b Pxp_document.node #Pxp_document.extension as 'b) -> unit) ->
> unit
>
> Is this due to the two '#' signs on Pxp_document.extension, yielding two
> different ellipsis type variables?
Indeed, this is a strange error message.
As far as I can see, it really says "This expression has type t but is
here used with type t". 'a and 'b are bound variables, so the ellipsis
is not the problem.
Even if the type checking is correct in detecting a type error, this
is not a valid error message.
Can you send me a sufficiently small program exhibiting this
behaviour?
Jacques Garrigue
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next prev parent reply other threads:[~2004-03-03 8:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-01 14:18 Alex Baretta
2004-03-03 8:16 ` Jacques Garrigue [this message]
2004-03-03 15:19 ` Mikael Brockman
2004-03-04 11:48 ` Alex Baretta
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