[mercury-users] Re: coloured petri nets

[Ralph Becket]

> 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
environments
> according to which location we wish to use that token in.  This
approach
> only allows us to bind to one environment.
> 
> Here is the code from my first attempt, which might explain better
what
> 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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