X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcTyClsDecls.lhs;h=3155e09d92734bf53031b27ce30faf061dc93688;hb=0f22eb9f85ca54f2545f64c43983c7d4a105420c;hp=b942ec2ab35091e8c91870cbf67182a982995ebd;hpb=c0cc5433a24d5b30de7d6ec6e03480dc9a0958e1;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcTyClsDecls.lhs b/compiler/typecheck/TcTyClsDecls.lhs
index b942ec2..3155e09 100644
--- a/compiler/typecheck/TcTyClsDecls.lhs
+++ b/compiler/typecheck/TcTyClsDecls.lhs
@@ -241,9 +241,9 @@ tcFamInstDecl (L loc decl)
     tcAddDeclCtxt decl				$
     do { -- type families require -ftype-families and can't be in an
 	 -- hs-boot file
-       ; gla_exts <- doptM Opt_TypeFamilies
+       ; type_families <- doptM Opt_TypeFamilies
        ; is_boot  <- tcIsHsBoot	  -- Are we compiling an hs-boot file?
-       ; checkTc gla_exts      $ badFamInstDecl (tcdLName decl)
+       ; checkTc type_families $ badFamInstDecl (tcdLName decl)
        ; checkTc (not is_boot) $ badBootFamInstDeclErr
 
 	 -- perform kind and type checking
@@ -693,7 +693,6 @@ tcTyClDecl1 calc_isrec
   ; stupid_theta <- tcHsKindedContext ctxt
   ; want_generic <- doptM Opt_Generics
   ; unbox_strict <- doptM Opt_UnboxStrictFields
-  ; gla_exts     <- doptM Opt_GlasgowExts
   ; empty_data_decls <- doptM Opt_EmptyDataDecls
   ; kind_signatures <- doptM Opt_KindSignatures
   ; gadt_ok      <- doptM Opt_GADTs
@@ -1058,18 +1057,20 @@ checkNewDataCon con
 -------------------------------
 checkValidClass :: Class -> TcM ()
 checkValidClass cls
-  = do	{ 	-- CHECK ARITY 1 FOR HASKELL 1.4
-	  gla_exts <- doptM Opt_GlasgowExts
+  = do	{ constrained_class_methods <- doptM Opt_ConstrainedClassMethods
+	; multi_param_type_classes <- doptM Opt_MultiParamTypeClasses
+	; fundep_classes <- doptM Opt_FunctionalDependencies
 
     	-- 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)
+	; checkTc (fundep_classes || null fundeps) (classFunDepsErr cls)
 
    	-- Check the super-classes
 	; checkValidTheta (ClassSCCtxt (className cls)) theta
 
 	-- Check the class operations
-	; mappM_ (check_op gla_exts) op_stuff
+	; mappM_ (check_op constrained_class_methods) op_stuff
 
   	-- Check that if the class has generic methods, then the
 	-- class has only one parameter.  We can't do generic
@@ -1077,11 +1078,11 @@ checkValidClass cls
 	; checkTc (unary || no_generics) (genericMultiParamErr cls)
 	}
   where
-    (tyvars, theta, _, op_stuff) = classBigSig cls
+    (tyvars, fundeps, theta, _, _, op_stuff) = classExtraBigSig cls
     unary 	= isSingleton tyvars
     no_generics = null [() | (_, GenDefMeth) <- op_stuff]
 
-    check_op gla_exts (sel_id, dm) 
+    check_op constrained_class_methods (sel_id, dm) 
       = addErrCtxt (classOpCtxt sel_id tau) $ do
 	{ checkValidTheta SigmaCtxt (tail theta)
 		-- The 'tail' removes the initial (C a) from the
@@ -1109,11 +1110,11 @@ checkValidClass cls
 	  op_ty   = idType sel_id
 	  (_,theta1,tau1) = tcSplitSigmaTy op_ty
 	  (_,theta2,tau2)  = tcSplitSigmaTy tau1
-	  (theta,tau) | gla_exts  = (theta1 ++ theta2, tau2)
-		      | otherwise = (theta1, 	       mkPhiTy (tail theta1) tau1)
+	  (theta,tau) | constrained_class_methods = (theta1 ++ theta2, tau2)
+		      | otherwise = (theta1, mkPhiTy (tail theta1) tau1)
 		-- Ugh!  The function might have a type like
 		-- 	op :: forall a. C a => forall b. (Eq b, Eq a) => tau2
-		-- With -fglasgow-exts, we want to allow this, even though the inner 
+		-- With -XConstrainedClassMethods, we want to allow this, even though the inner 
 		-- forall has an (Eq a) constraint.  Whereas in general, each constraint 
 		-- in the context of a for-all must mention at least one quantified
 		-- type variable.  What a mess!
@@ -1138,7 +1139,11 @@ nullaryClassErr cls
 
 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"))]
+
+classFunDepsErr cls
+  = vcat [ptext SLIT("Fundeps in class") <+> quotes (ppr cls),
+	  parens (ptext SLIT("Use -XFunctionalDependencies to allow fundeps"))]
 
 noClassTyVarErr clas op
   = sep [ptext SLIT("The class method") <+> quotes (ppr op),