checkValidClass cls
= do { -- CHECK ARITY 1 FOR HASKELL 1.4
gla_exts <- doptM Opt_GlasgowExts
+ ; multi_param_type_classes <- doptM Opt_MultiParamTypeClasses
-- Check that the class is unary, unless GlaExs
; checkTc (notNull tyvars) (nullaryClassErr cls)
- ; checkTc (gla_exts || unary) (classArityErr cls)
+ ; checkTc (multi_param_type_classes || unary) (classArityErr cls)
-- Check the super-classes
; checkValidTheta (ClassSCCtxt (className cls)) theta
classArityErr cls
= vcat [ptext SLIT("Too many parameters for class") <+> quotes (ppr cls),
- parens (ptext SLIT("Use -fglasgow-exts to allow multi-parameter classes"))]
+ parens (ptext SLIT("Use -XMultiParamTypeClasses to allow multi-parameter classes"))]
noClassTyVarErr clas op
= sep [ptext SLIT("The class method") <+> quotes (ppr op),