From: Adrien <camaradetux@gmail.com>
To: Caml Mailing List <caml-list@yquem.inria.fr>
Subject: [Caml-list] Optional arguments "between" non-optional ones
Date: Thu, 23 Sep 2010 15:20:59 +0200 [thread overview]
Message-ID: <AANLkTi=G6xG6b56FZsT9=n26y9f0Tzpk-3g+_P0sLo1h@mail.gmail.com> (raw)
Hi,
I was refactoring code today and hit a typing error that I couldn't
explain. I eventually tracked it down to the following:
let f () ?a () =
print_endline "bouh!"
let h f =
f () ()
let () = h f;; (* error is for "f" here *)
Error: This expression has type unit -> ?a:'a -> unit -> unit
but an expression was expected of type unit -> unit -> 'b
If I remove the first unit argument of f, then it works as expected.
There also seems to be variations around that.
Is there any explanation for that difference? And any chance of it
getting improved?
Thanks.
--
Adrien Nader
next reply other threads:[~2010-09-23 13:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-23 13:20 Adrien [this message]
2010-09-23 14:32 ` bluestorm
2010-09-23 15:05 ` Adrien
2010-09-24 1:32 ` Jacques Garrigue
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