= rnInstDecl inst `thenRn` \ new_inst ->
rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) ->
returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
= rnInstDecl inst `thenRn` \ new_inst ->
rnInstBinds inst new_inst `thenRn` \ (new_inst', fvs) ->
returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')