It occurred to me as i was messing around with handling and re-raising
exceptions that tossing around these (type, value, traceback) triples
is irritating and error-prone.
How about just passing around a single value? All we'd have to do is
put the traceback in value.traceback.
Implementation:
- "raise Class" and "raise Class, string" automatically set
the .traceback attribute on the new instance of Class.
- "raise instance" automatically sets the .traceback attribute
on the instance unless it already has one.
The behaviour of "except" and "sys.exc_*" could remain unchanged.
"raise t, v, tb" would eventually be deprecated in favour of "raise v".
-- ?!ng
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