$ ghci Main.hsGHCi, version 6.10.4: http://www.haskell.org/ghc/ :? for helpLoading package ghc-prim ... linking ... done.Loading package integer ... linking ... done.Loading package base ... linking ... done.ghc: panic! (the 'impossible' happened) (GHC version 6.10.4 for i386-unknown-linux): getOptions'.parseLanguage(1) went past eof tokenPlease report this as a GHC bug: http://www.haskell.org/ghc/reportabug