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

[STINNER Victor]

STINNER Victor added the comment:

Serhiy Storchaka added the comment:
> What is the difference between using parse_known_args() and
nargs=argparse.REMAINDER?

Using REMAINDER, args become ["b", "-c", "d"] for -a b -c d.

I would be happy to not use parse_known_args(), but I didn't find how.

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<http://bugs.python.org/issue28409>
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