This is the Data.FunctorM module from 6.6's base, deleted from HEAD still used by some projects (notably jhc); this package can be used for compatibility. Hackage: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/functorm-1.0 Tarball: http://hackage.haskell.org/packages/archive/functorm/1.0/functorm-1.0.tar.gz Stefan