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Sources, sinks, and unbound parameter types
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Date: -- (:)
From: Daniel_Bünzli <daniel.buenzli@e...>
Subject: Re: [Caml-list] Sources, sinks, and unbound parameter types
It seems what you want is existential types, see the example with  
lists of composable functions here [1,2].

Best,

Daniel

[1] http://caml.inria.fr/pub/ml-archives/caml-list/2004/01/52732867110697f55650778d883ae5e9.fr.html
[2] http://caml.inria.fr/pub/ml-archives/caml-list/2004/01/470ee4e9fe63cf36e1bc477980b102e2.fr.html