I find it very valuable to seperate tokens from non-token rules. And I find very little worth in <auto...> 
cpus : INT cpu_list[ $item[1] ] { [ $item[0], $item[2] ] }

INT  : /\d+/   # Add "{ $item[1] }" if using "<auto...>"

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In reply to Re^7: Parse::RecDescent and auto{actions,trees} and stuff by ikegami
in thread Parse::RecDescent and auto{actions,trees} and stuff by mattford63

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