ppr styles...

[MR K P SCHUPKE]

I have added some of the required deriving clauses, however I now
get lots of warnings about:

Bad eta expand
    __coerce ()
    (CmmParse.zgzg {- v rnrp -}
       @ ()
       @ ()
       (__coerce CmmParse.ExtCode {- tc rB2 -} happyzuxzu1 {- v a1B9 -})
       (__coerce CmmParse.ExtCode {- tc rB2 -} happyzuxzu2 {- v a1B8 -})
       (__coerce CmmParse.Env {- tc rB6 -} eta {- v skLC -}))
    ()

Is this something I should worry about?

	Keean.