bring in Data.Monoid from the ghc libraries for compatability
bring in Data.Monoid from the ghc libraries for compatability

Ignore-this: dbb2cc4c5331a482eb8514c215814a42

darcs-hash:24c719d31197ec5cb1e262ea7ff69e2c884754d1

dpwright/jhc,dpwright/jhc,dpwright/jhc,dpwright/jhc