STINNER Victor <vstin...@redhat.com> added the comment:

> The optimization is skipped if lnotab contains 255. It was very uncommon in 
> older versions (only when the function contains very large expressions, 
> larger than hundreds of lines or bytecode instructions), but in 3.8 this 
> situation is common.

Do you know why 255 became more common? Is it the side effect if an AST 
optimization?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37213>
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