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

[Matthias Bussonnier]

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

Potentially due to 

https://bugs.python.org/issue40807
https://github.com/python/cpython/pull/20486

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