[mercury-users] Re: coloured petri nets

Ralph Becket rbeck at microsoft.com
Thu Sep 6 23:52:17 AEST 2001

> From: Peter Ross [mailto:peter.ross at miscrit.be]
> Sent: 06 September 2001 12:06
> The problem is that a place will need to bind to different
> according to which location we wish to use that token in.  This
> only allows us to bind to one environment.
> Here is the code from my first attempt, which might explain better
> I am trying to do.

It's getting harder to see what's going on.

I'm assuming you have to use type classes and existential types 
and that ordinary algebraic data types are not suitable for
whatever reason.

Can you give us a potted summary of what you want to do?  When you
read code fragments it's hard to work out whether you agree, in the
absence of context, with the approach taken.

- Ralph
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