Something that would be useful is command line options that will make ghc conform to the standards in one shot. I have various programs that conform to the standards and the onlyrce of incompatibility is the changing options needed to get ghc to compile them. This is analogous to how hugs has the -98 flag and the C standard specifies that 'c99' is an alias to your C compiler that enforces full ISO c99 compatibility. I was thinking providing ghc98 and ghc2010 command aliases, or making an option '--std=haskell98'. another option would be to have -XHaskell98 also modify the package imports in addition to language features, but this may be undesireable as then it would behave differently when specified in a LANGUAGE pragma. John -- John Meacham - http://notanumber.net/