At one point, theDamian said he would rewrite it to use pos (which wasn't available in 5.004 when he wrote PRD)
First non-comment, non-whitespace line of Parse::RecDescent: 
    use 5.005;

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In reply to Re^3: Parse::RecDescent and need for speed by Anonymous Monk
in thread Parse::RecDescent and need for speed by EchoAngel

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