On Fri, Sep 4, 2009 at 4:53 PM, John Meacham<john at repetae.net> wrote: > I was thinking more of the 'mappend's introduced by every (>>) and (>>=). Oh, those. I think there's some optimizer trickery to rewrite (mappend x mempty) to x. -- Taral <taralx at gmail.com> "Please let me know if there's any further trouble I can give you." -- Unknown