Re: abstraction power

Thanks Jon for tranlating the basic idea of my Scheme code into ML. 

If I can think of a simple way to show the expressive power (in the sense
that you and I publish about), I will write it up.  
 [Note: We have a paper submitted for pubs that uses the trick but it is
  difficult to distill it down to a message. Plus, the paper doesn't
  contain a proof concerning `expressiveness' -- that's not the point.]

I am aware of the exn trick, which is used for all kinds of purposes. 
Apologies for the misrepresentation of your message. And of course I 
am happy to see open-minded Typers :-)

-- Matthias