bpo-17611. Move unwinding of stack for "pseudo exceptions" from interpreter to compiler. (alt) by serhiy-storchaka · Pull Request #5143 · python/cpython
An alternative to #5006 that restores SETUP_EXCEPT and gets rid of the new opcode BEGIN_FINALLY.
SETUP_FINALLY, SETUP_WITH and SETUP_ASYNC_WITH now push NULL on the stack instead.