Arguments to subrules

list:        <matchrule:$arg{rule}> /$arg{sep}/ list[%arg]
                   { $return = [ $item[1], @{$item[3]} ] }
         |   <matchrule:$arg{rule}>
                   { $return = [ $item[1]] }

function:    'func' name '(' list[rule=>'param',sep=>';'] ')'

param:       list[rule=>'name',sep=>','] ':' typename

name:        /\w+/

typename:    name

• list is a generic template for matching a separated list.