[issue42521] Debug (-d) mode not working in 3.9

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

In PyConfig, I chose to name the option "parser_debug" rather than the very generic "debug" name :-)

"""
Parser debug mode. If greater than 0, turn on parser debugging output (for expert only, depending on compilation options).

Incremented by the -d command line option. Set to the PYTHONDEBUG environment variable value.
"""

https://docs.python.org/dev/c-api/init_config.html#c.PyConfig.parser_debug

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nosy: +vstinner

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