Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Simplified PR 5077. It uses now NEXT_BLOCK() to guarantee that a new block is 
always used after jumps. NEXT_BLOCK() was defined, but not used before.

bpo-35193 and bpo-9566 demonstrate that the code of peephole.c is complex and 
error-prone. Moving it to the upper level makes it more error-proof and general.

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versions: +Python 3.8 -Python 3.7

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<https://bugs.python.org/issue32477>
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