Apparently the old exception library had convenience functions like
'arithExceptions' that could be used with 'handleJust'.
handleJust arithExceptions handler thing
With the new module you can write something like this (I determined this
from experimentation):
arithExceptionTester :: ArithException -> IO ()
arithExceptionTester = Just ()
handleJust arithExceptionTester handler thing
Two questions:
(1) Is there a better way to do things?
(2) I don't understand quite how the type system works. Somehow, on
exceptions that aren't arithmetic, arithExceptionTester returns Nothing or
at least behaves that way. Yet I didn't write any code to do that. Can
someone explain this?
Thanks,
Mike
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