[issue41520] codeop: 3.8.5 regression, warnings.simplefilter('error', SyntaxWarning) does not raise.

[Matthias Bussonnier]

Matthias Bussonnier <bussonniermatthias at gmail.com> added the comment:

> Thanks Matthias Bussonnier for the fix. 

Thank *YOU* for the fix, and the bug report is initially from tcaswell. 

At least on 3.8 branch this is fixed for me.

Just for completeness, this was discovered as in IPython we try to guess whether "enter"  is "insert new line" or "execute", and `1 is 1<enter>` would keep adding new lines.

Much love for the fast turnaround; looking fwd to 3.9

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