q

compiler/typecheck/Inst.lhs

@@ -110,7 +110,8 @@ instType imp@(ImplicInst {})      = mkImplicTy (tci_tyvars imp) (tci_given imp)
 					       (tci_wanted imp)
 
 mkImplicTy tvs givens wanteds	-- The type of an implication constraint
-  = -- pprTrace "mkImplicTy" (ppr givens) $
+  = ASSERT( all isDict givens )
+    -- pprTrace "mkImplicTy" (ppr givens) $
     mkForAllTys tvs $ 
     mkPhiTy (map dictPred givens) $
     if isSingleton wanteds then
@@ -330,6 +331,7 @@ mkPredName uniq loc pred_ty
     occ = case pred_ty of
 	    ClassP cls tys -> mkDictOcc (getOccName cls)
 	    IParam ip ty   -> getOccName (ipNameName ip)
+	    EqPred _ _     -> pprPanic "mkPredName" (ppr pred_ty)
 \end{code}
 
 %************************************************************************

compiler/typecheck/TcSimplify.lhs

@@ -1236,7 +1236,7 @@ tcSimplifyRestricted doc top_lvl bndrs tau_tvs wanteds
         returnM (varSetElems qtvs, binds)
     else
 	let
-    	    (non_ips, bad_ips) = partition isClassDict irreds
+    	    (bad_ips, non_ips) = partition isIPDict irreds
 	in    
 	addTopIPErrs bndrs bad_ips	`thenM_`
 	extendLIEs non_ips		`thenM_`
@@ -1992,9 +1992,6 @@ extractResults (Avails _ avails) wanteds
 	  Just (Rhs rhs ws') -> go (add_given avails w) new_binds irreds (ws' ++ ws)
 			     where
 				new_binds = addBind binds w rhs
-	where
-	  w_span = instSpan w
-	  w_id = instToId w
 
     add_given avails w = extendAvailEnv avails w (Given (instToId w))