| For the moment I've chosen to do the mdo desugaring manually instead | of moving to the CVS ghc (or exclusively using Hugs.) Will mdo be in | the next release? (That's 5.04.2, I think -- though I've recently | been confused about GHC releases.) The relevant revision to Lex.lhs | is pretty recent and doesn't seem to be on ghc-5-04-branch. mdo won't be in 5.04.2; these patch releases are meant to be bug fixes only. As I mentioned in an earlier message, we are undecided about when to invest the effort to make another major release. The more people that yell, the sooner we will do it! Main things in the next major release are mdo Template Haskell a fairly major fix to the newtype-deriving mechanism (it's a bit broken in 5.04) Simon