[plt-scheme] abstract methods/classes

Robert Bruce Findler <robby at cs.uchicago.edu> writes at 23:09 21-Mar-2003 -0600:
> I typically just write methods that only raise exceptions.

That's what I've been doing.  The drawback is that missing methods
aren't detected until method invocation time, rather than at object
instantiation time (or at subclass definition time, if we added syntax
for whether the class being defined was abstract or concrete).

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