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Re: exception systems
Date: Thu, 18 Apr 1996 18:15:59 -0400
From: Matthias Blume <blume@CS.Princeton.EDU>
I still think there is way too much in it. Where is MI suddenly
coming from? If I recall correctly, we don't even have SI in Scheme
-- and I'm very happy about this fact.
So am I. My initial reaction to multiple-inheritance was Uuugh!
I changed my mind when I was unable to come up with an reasonable
alternative. Note that I am not suggesting adding multiple
inheritance for anything other than conditions.
Then: recoveries, restarts, ... this is what I call `bloat'. For the
cases where you think you need the fancy stuff I am sure one can
easily come up with a straighforward way of doing it using plain old
I think you are missing the point. The issue isn't functionality.
As I said in the proposal it could all be implemented easily in
Scheme. The issue is interfaces. The notion is that you should
be able to say for procedure <foo>:
If <foo>'s argument is not a <bar> it installs an <interactive>
restart that accepts a new argument and then signals a <wrong-
Yes, you can implement this in Scheme, but then how do you describe
the behavior of <foo> in a succinct and portable way?
I would be perfectly happy with something as simple as
Which is exactly what I proposed originally. The consensus
was that it was completely inadequate. You didn't comment at