Ben Longbons added the comment:

Also consider:

*() or (), *() or ()
[*() or (), *() or ()]
{*() or (), *() or ()}
{**{} or {}, **{} or {}}

Note that the second-or-later argument is a separate part of the grammar so 
that's why I wrote it twice.

Actually, I think `star_expr` will probably go away entirely.

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<http://bugs.python.org/issue24791>
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