X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypes%2FFunDeps.lhs;h=ac5c0a0b1ee01ef031ae1733877ddc5f74c8b1aa;hb=937eb1f1386f12c729c6d819417fe81bc4786b9f;hp=b45778a6fffee6dff763c39d948c5c271d97d9f0;hpb=8d992aa26acc3ea744dcbbc366ab89739e4b6230;p=ghc-hetmet.git

diff --git a/compiler/types/FunDeps.lhs b/compiler/types/FunDeps.lhs
index b45778a..ac5c0a0 100644
--- a/compiler/types/FunDeps.lhs
+++ b/compiler/types/FunDeps.lhs
@@ -146,7 +146,7 @@ See also Note [Ambiguity] in TcSimplify
 \begin{code}
 grow :: [PredType] -> TyVarSet -> TyVarSet
 grow preds fixed_tvs 
-  | null preds = real_fixed_tvs
+  | null preds = fixed_tvs
   | otherwise  = loop real_fixed_tvs
   where
 	-- Add the implicit parameters; 
@@ -197,6 +197,7 @@ type Equation = (TyVarSet, [(Type, Type)])
 -- We usually act on an equation by instantiating the quantified type varaibles
 -- to fresh type variables, and then calling the standard unifier.
 
+pprEquation :: Equation -> SDoc
 pprEquation (qtvs, pairs) 
   = vcat [ptext SLIT("forall") <+> braces (pprWithCommas ppr (varSetElems qtvs)),
 	  nest 2 (vcat [ ppr t1 <+> ptext SLIT(":=:") <+> ppr t2 | (t1,t2) <- pairs])]
@@ -243,7 +244,7 @@ improveOne :: (Class -> [Instance])		-- Gives instances for given class
 						-- combined (for error messages)
 -- Just do improvement triggered by a single, distinguised predicate
 
-improveOne inst_env pred@(IParam ip ty, _) preds
+improveOne _inst_env pred@(IParam ip ty, _) preds
   = [ ((emptyVarSet, [(ty,ty2)]), pred, p2) 
     | p2@(IParam ip2 ty2, _) <- preds
     , ip==ip2
@@ -294,7 +295,7 @@ improveOne inst_env pred@(ClassP cls tys, _) preds
 			<+> ppr (getSrcLoc ispec))
 	]
 
-improveOne inst_env eq_pred preds
+improveOne _ _ _
   = []