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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