The Coq mailing list

[roconnor AT theorem.ca]

As I understand, Andre' Hirschowitz and Marco Maggesi use the nested 
data-type for bindings in thier solution to the POPLmark challenge

<http://web.math.unifi.it/users/maggesi/fsub/>

You may wish to see how they define their functions.

--
Russell O'Connor                                      <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''