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Date:Mon Mar 30 17:23:31 2000 
Subject:Re: FWD: from Jonathan Cunningham about Macintosh implementations 
From:pop 
Volume-ID:1000330.05 

A more systematic approach to system error handling would have other
benefits. For example my Scheme implementation still has a few
errors that are reported by the POP-11 error-reporting process.
It would be beneficial to be able to plug in my own error messages
in an easy way. Likewise it's sometimes desirable to catch
mishaps and handle them in a non-standard way. For example
one might extend the "+" function to produce a formal sum
"x+y" represented, say, as a prolog term, if addition is given
algebraic arguments.

Robin.