[issue28409] test.regrtest does not support multiple -x flags

[STINNER Victor]

STINNER Victor added the comment:

Attached patch should fix the issue.

I didn't know that argparse was so strict: "arg1 -v arg2" is not supported by default, see the issue #14191, whereas it works well with optparse.

The patch uses parse_known_args() as a workaround, and then manually checks for unknown options.

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keywords: +patch
Added file: http://bugs.python.org/file45056/regrtest_cli.patch

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