import Unify ( unifyTyListsX )
import Subst ( mkSubst, emptyInScopeSet, substTy )
import TcEnv ( tcGetInstEnv )
-import TcInstUtil ( classInstEnv )
+import InstEnv ( classInstEnv )
import TcMonad
import TcType ( TcType, TcTyVarSet, zonkTcType )
import TcUnify ( unifyTauTyLists )