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A closer approximation of what the with statement is doing would be:
exit = lock.release()
lock.acquire()
try:
 pass
finally:
 exit()
The problem with trying to store the result of the retrieval of __exit__
on the stack is that we need to leave the context manager itself on top
of the stack for the next LOAD_ATTR opcode (when we're retrieving the
__enter__ method).
However, changing WITH_CLEANUP to take an argument indicating which
local variable holds the bound __exit__ method sounds like it might work.