[issue37747] _markupbase.py fails with TypeError on invalid keyword in marked section

[Leonard Richardson]

Leonard Richardson <leonardr at segfault.org> added the comment:

This was also recently filed as a bug against Beautiful Soup, a package I maintain, using Python 3.8. (https://bugs.launchpad.net/beautifulsoup/+bug/1883104)

The attached script reproduces the problem without using external packages.

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nosy: +leonardr
versions: +Python 3.8
Added file: https://bugs.python.org/file49226/test_issue37747.py

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