[Python-Dev] Deprecating string exceptions

[Guido van Rossum]

> Paul Prescod <paul@prescod.net> writes:
> 
> > Should it be arbitrary objects or just subclasses of exception: "It is
> > recommended that user-defined exceptions in new code be derived from
> > Exception, although for backward compatibility reasons, this is not
> > required. Eventually this rule will be tightened."

[Martin]
> If that is the rule, the bug report can be closed as "not-a-bug".

I seem to have a particularly dense day. :-(

What does "that" (in "If that is the rule") refer back to?

--Guido van Rossum (home page: http://www.python.org/~guido/)