From: Philippe Veber <philippe.veber@gmail.com>
To: caml users <caml-list@inria.fr>
Subject: [Caml-list] Narrowing a signature with a constrained type
Date: Fri, 26 Jul 2013 15:32:18 +0200 [thread overview]
Message-ID: <CAOOOohToApXavb6iD01xR==MwCcVg=NZa4w_0qo69KwLdSkiNg@mail.gmail.com> (raw)
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Dear camlers,
Out of curiosity, I'd be happy to understand why the following definition
is rejected:
# module type T = sig type 'a format end;;
module type T = sig type 'a format end
# module F(X : T with type 'a format = 'a list constraint 'a = < .. >) =
struct end;;
File "", line 1, characters
13-67:
Error: In this `with' constraint, the new definition of format does not
match its original definition in the constrained
signature:
Type declarations do not match: type 'a format = 'a0 list is not included
in type 'a
format
Their constraints differ.
Would it be unsound to allow it?
Cheers,
ph.
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next reply other threads:[~2013-07-26 13:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-26 13:32 Philippe Veber [this message]
2013-07-26 23:35 ` Jacques Garrigue
2013-07-27 20:07 ` Philippe Veber
2013-07-29 8:51 ` Arnaud Spiwack
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