isDictTy :: Type -> Bool
isDictTy ty | Just ty' <- tcView ty = isDictTy ty'
-isDictTy (PredTy p) = isClassPred p
-isDictTy other = False
+isDictTy (PredTy p) = isClassPred p
+isDictTy other = False
\end{code}
--------------------- Implicit parameters ---------------------------------