From: Alain Frisch <Alain.Frisch@inria.fr>
To: Bruno De Fraine <Bruno.De.Fraine@vub.ac.be>
Cc: caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Type from local module would escape its scope?
Date: Mon, 03 Jul 2006 15:45:31 +0200 [thread overview]
Message-ID: <44A91F7B.6090204@inria.fr> (raw)
In-Reply-To: <069A1F65-E50C-4363-9CCA-C6CC9A453D09@vub.ac.be>
Bruno De Fraine wrote:
> While the following is rejected:
>
> let foo (ignore: 'a -> unit) =
> let module Foo : FOO =
> struct
> type t = int
> let value = 1
> end in
> ignore Foo.value
> ;;
The 'a variable is existential and it must be instantiated (because
functional arguments are used monomorphically). Clearly, it will be
unified with Foo.t, which is abstract, and so the type for foo, if it
were well-typed, would be:
val foo: (Foo.t -> unit) -> unit
Foo.t would escape its scope, which is not ok.
-- Alain
next prev parent reply other threads:[~2006-07-03 13:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-03 13:19 Bruno De Fraine
2006-07-03 13:23 ` [Caml-list] " Jonathan Roewen
2006-07-03 13:38 ` Jean-Marie Gaillourdet
2006-07-03 13:45 ` Alain Frisch [this message]
2006-07-03 13:51 ` Virgile Prevosto
2006-07-03 14:23 ` skaller
2006-07-03 14:50 ` Bruno De Fraine
2006-07-03 15:10 ` Jonathan Roewen
2006-07-03 17:30 ` Petty complaint (Was Re: [Caml-list] Type from local module would escape its )scope? brogoff
2006-07-03 18:50 ` Etienne Miret
2006-07-04 21:08 ` Boris Yakobowski
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