From: "Jun Furuse" <jun.furuse@gmail.com>
To: caml-list@yquem.inria.fr
Subject: Recursive module and class
Date: Thu, 10 Jul 2008 09:43:21 -0400 [thread overview]
Message-ID: <5160b4200807100643i2c7dbf0aw2fb681b0745a8ba2@mail.gmail.com> (raw)
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Hi,
Sorry if the following is already a known issue.
The following program trying to define a type and a class mutually recursive
is rejected by ocamlc (3.11+dev12 Private_abbrevs+natdynlink (2008-02-29)):
module rec M : sig
type t = Foo of N.c
end = struct
type t = Foo of N.c
end and N : sig
class c : object method x : M.t end
end = struct
class c = object (self)
method x = M.Foo (self :> c)
end
end
The error message is puzzling:
Error: Signature mismatch:
Modules do not match:
sig class c : object method x : M.t end end
is not included in
sig class c : object method x : M.t end end
Type declarations do not match:
type c = N.c
is not included in
type c = < x : M.t >
These signatures are literaly same, but do not match.
The above code is accepted by the compiler if I write
method x = M.Foo (self :> N.c)
to coerce the object to the outer class N.c instead of c.
Is it a bug of typing? Or is it ok but with a puzzling error message ?
--
Jun FURUSE
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next reply other threads:[~2008-07-10 13:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-10 13:43 Jun Furuse [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-07-09 23:32 Jun Furuse
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