Better error message for fundep conflict

[ghc-hetmet.git] / compiler / types / Class.lhs

diff --git a/compiler/types/Class.lhs b/compiler/types/Class.lhs
index fb7cab1..e7bda63 100644 (file)
--- a/compiler/types/Class.lhs
+++ b/compiler/types/Class.lhs
@@ -10,7 +10,7 @@ module Class (
        Class, ClassOpItem, 
        DefMeth (..),
 
-       FunDep, pprFundeps,
+       FunDep, pprFundeps, pprFunDep,
 
        mkClass, classTyVars, classArity,
        classKey, className, classATs, classSelIds, classTyCon, classMethods,
@@ -174,9 +174,9 @@ instance Outputable DefMeth where
 
 pprFundeps :: Outputable a => [FunDep a] -> SDoc
 pprFundeps []  = empty
-pprFundeps fds = hsep (ptext (sLit "|") : punctuate comma (map ppr_fd fds))
-              where
-                ppr_fd (us, vs) = hsep [interppSP us, ptext (sLit "->"), 
-                                        interppSP vs]
+pprFundeps fds = hsep (ptext (sLit "|") : punctuate comma (map pprFunDep fds))
+
+pprFunDep :: Outputable a => FunDep a -> SDoc
+pprFunDep (us, vs) = hsep [interppSP us, ptext (sLit "->"), interppSP vs]
 \end{code}