Sam Kerr added the comment:

What I was going for was the ability to have a group contain a mutually 
exclusive group and a non-exclusive group, but using the mutually exclusive 
group meant you could not use the non-exclusive group.

Such as:

[ [ -opt1 | -opt2 | -opt3   ] [ [-opt4] [-opt5] [-opt6] ] ]

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22047>
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