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[Caml-list] References to polymorphic variants
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Date: -- (:)
From: Eric C. Cooper <ecc@c...>
Subject: Re: [Caml-list] References to polymorphic variants
On Wed, Feb 25, 2004 at 09:05:48AM -0700, nickgrey@softhome.net wrote:
> I want to be able to store an arbitrary polymorphic variant in a reference: 
> 
> let (x : ([> ] option) ref ) = ref None ;; 
> 
> (Not my actual code, I've boiled it down to a minimal example.) 
> 
> This won't compile because it "contains a type variable which cannot be 
> generalized".

It works in version 3.07+2:

        Objective Caml version 3.07+2

# let (x : [> ] option ref) = ref None;;
val x : _[>  ] option ref = {contents = None}

-- 
Eric C. Cooper          e c c @ c m u . e d u

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