I use this little script called with ghc -pgmF ./drift -F ; cat ./drift #!/bin/ash if grep -q '{-!' $2; then echo DrIFT $2 -o $3; DrIFT $2 -o $3; else echo "{-# LINE \"$1\" 0 #-}" >> $3 cat $2 >> $3; fi however it seems to have stopped working with ghc cvs rather than 6.01. it dies with a 'lexical error' on the LINE pragmas generated by the script and DrIFT. any idea what the problem is? John PS. on another tangent (although this is is probably a library issue), I tried modifying my code to use the new Data.Generics rather than Strafunski, and found that Data could not be derived because instances for a lot of built in classes don't exist and it is unclear how to write them by hand. is it possible to retroactivly add a 'deriving' clause to something that was declared in another unmodifyable module? or can we make sure that all predefined (and library) types derive Data? -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - john@foo.net ---------------------------------------------------------------------------