Erik Bray added the comment:
Actually I just finished reading njs's blog post, and as he points out that
special case for SETUP_FINALLY is basically broken. There are other cases
where it doesn't really work either. For example if you have:
if ...:
do_something()
else:
do_something_else()
try:
...
finally:
...
then (ignoring the issue about POP_TOP for a moment) the last instruction in
*one* of these branches if followed immediately by SETUP_FINALLY, while in the
other branch there's a JUMP_FORWARD, then the SETUP_FINALLY.
All the more reason for a more generic solution to this that doesn't depend
strictly on the next op locally in the byte code.
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<http://bugs.python.org/issue29988>
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