capturing part of a recursive Parse::RecDescent production

vvalue:
    primitive vector_sep(?) vvalue
    | primitive vector_sep(?)

vvalue:
    primitive vector_sep(?) vvalue
        { \@item }
    | primitive vector_sep(?)
        { \@item }

                       [
                         'vvalue',
...
                         $VAR1->[6]{'value'}
                       ],

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