From: "Jacques Le Normand" <rathereasy@gmail.com>
To: "caml-list caml-list" <caml-list@yquem.inria.fr>
Subject: question about polymorphic variants
Date: Fri, 2 May 2008 13:35:35 -0400 [thread overview]
Message-ID: <f74178430805021035h60296fc7l133c23a222e41260@mail.gmail.com> (raw)
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Hello caml-list,
when I try to run the following code:
type sometype =
([
`Foo of int
| `Bar of int
| `Var of 'a ref
] as 'a)
type someother =
([
`Foo of int
| `Var of 'a ref
] as 'a)
let foo : someother = `Foo 5;;
(foo :> sometype)
in my ocaml repl, it gives me the following error
This expression cannot be coerced to type
sometype = [ `Bar of int | `Foo of int | `Var of sometype ref ];
it has type someother = [ `Foo of int | `Var of someother ref ]
but is here used with type
[< sometype ] = [< `Foo of int | `Var of sometype ref ]
Type someother = [ `Foo of int | `Var of someother ref ]
is not compatible with type
sometype = [ `Bar of int | `Foo of int | `Var of sometype ref ]
The first variant type does not allow tag(s) `Bar
how do I get around this?
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next reply other threads:[~2008-05-02 17:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-02 17:35 Jacques Le Normand [this message]
2008-05-02 18:03 ` Rémi Vanicat
-- strict thread matches above, loose matches on Subject: below --
2005-10-28 9:57 Question " Xavier Clerc
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