[issue11874] argparse assertion failure with brackets in metavars

[Manveru]

Manveru <manveru at manveru.pl> added the comment:

I was a victim of the same issue, but only after my usage list does not fit in one line. Please fix!

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nosy: +manveru

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11874>
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