From: Pietro Abate <Pietro.Abate@anu.edu.au>
To: caml-list@inria.fr
Subject: [Caml-list] signature mismatch
Date: Tue, 17 Jun 2003 23:27:53 +1000 [thread overview]
Message-ID: <20030617132753.GA20764@anu.edu.au> (raw)
Hi all,
I get this error trying to compile the file below:
File "pp.ml", line 28, characters 22-24:
Signature mismatch:
Modules do not match:
sig type t = BB.t val toast : t -> t -> bool end
is not included in
sig type t = AA.t val toast : t -> t -> bool end
Type declarations do not match:
type t = BB.t
is not included in
type t = AA.t
how can I force BB.t to be the same as AA.t ?
why it's not enforced by the functor declaration (with type...) ?
tnx,
p
file :
-----------------
module type A1 = sig
type t
val test : t -> t -> bool
end
module type A2 = sig
type t
val toast : t -> t -> bool
end
module Make (A : A1 ) (B : A2 with type t = A.t) = struct
let fifi a b c =
if c > 1 then A.test a b
else B.toast b a
end
module AA : A1 = struct
type t = int
let test f1 f2 = true
end
module BB : A2 = struct
type t = int
let toast f1 f2 = false
end
module C = Make (AA) (BB)
---------------------
--
Civilization advances by extending the number
of important operations which we can perform
without thinking. (Alfred North Whitehead)
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next reply other threads:[~2003-06-17 13:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-17 13:27 Pietro Abate [this message]
2003-06-17 13:44 ` Damien Pous
2003-06-17 13:46 ` Jean-Christophe Filliatre
2003-06-17 14:01 ` Andreas Rossberg
2003-06-18 8:30 ` Julien Signoles
2003-06-18 8:56 ` Andreas Rossberg
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