diff --git a/src/Control/Abstract/PythonPackage.hs b/src/Control/Abstract/PythonPackage.hs
index 8c0a9143f..ffcbf99e9 100644
--- a/src/Control/Abstract/PythonPackage.hs
+++ b/src/Control/Abstract/PythonPackage.hs
@@ -7,7 +7,7 @@ import           Control.Abstract.Heap (Allocator, Deref, deref)
 import           Control.Abstract.Value
 import           Control.Effect.Carrier
 import           Control.Effect.Sum
-import           Data.Abstract.Evaluatable
+import           Data.Abstract.Evaluatable hiding (InterposeC)
 import           Data.Abstract.Name (name)
 import           Data.Abstract.Path (stripQuotes)
 import           Data.Abstract.Value.Concrete (Value (..), ValueError (..))
diff --git a/src/Data/Abstract/Evaluatable.hs b/src/Data/Abstract/Evaluatable.hs
index 7906764b7..babe1966f 100644
--- a/src/Data/Abstract/Evaluatable.hs
+++ b/src/Data/Abstract/Evaluatable.hs
@@ -30,6 +30,7 @@ import Control.Abstract.Modules as X (Modules, ModuleResult, ResolutionError(..)
 import Control.Abstract.Value as X hiding (Boolean(..), Function(..), While(..))
 import Control.Abstract.ScopeGraph
 import Control.Effect.Eavesdrop
+import Control.Effect.Interpose
 import Data.Abstract.Declarations as X
 import Data.Abstract.Environment as X
 import Data.Abstract.BaseError as X
@@ -86,15 +87,16 @@ class (Show1 constr, Foldable constr) => Evaluatable constr where
 
 
 type ModuleC address value m
-  = EavesdropC (Modules address) (Eff
-  ( ErrorC (LoopControl address) (Eff
-  ( ErrorC (Return address)      (Eff
-  ( EnvC address                 (Eff
-  ( ScopeEnvC address            (Eff
-  ( DerefC address value         (Eff
-  ( AllocatorC address           (Eff
-  ( ReaderC ModuleInfo           (Eff
-    m)))))))))))))))
+  = EavesdropC (Modules address)                                  (Eff
+  ( InterposeC (Resumable (BaseError (UnspecializedError value))) (Eff
+  ( ErrorC (LoopControl address)                                  (Eff
+  ( ErrorC (Return address)                                       (Eff
+  ( EnvC address                                                  (Eff
+  ( ScopeEnvC address                                             (Eff
+  ( DerefC address value                                          (Eff
+  ( AllocatorC address                                            (Eff
+  ( ReaderC ModuleInfo                                            (Eff
+    m)))))))))))))))))
 
 type ValueC term address value m
   = FunctionC term address value (Eff
@@ -110,7 +112,7 @@ evaluate :: ( AbstractValue term address value valueC
             , booleanC ~ BooleanC value (Eff moduleC)
             , Carrier (Boolean value :+: moduleSig) booleanC
             , whileC ~ WhileC value (Eff booleanC)
-            , moduleSig ~ (Eavesdrop (Modules address) :+: Error (LoopControl address) :+: Error (Return address) :+: Env address :+: ScopeEnv address :+: Deref value :+: Allocator address :+: Reader ModuleInfo :+: sig)
+            , moduleSig ~ (Eavesdrop (Modules address) :+: Interpose (Resumable (BaseError (UnspecializedError value))) :+: Error (LoopControl address) :+: Error (Return address) :+: Env address :+: ScopeEnv address :+: Deref value :+: Allocator address :+: Reader ModuleInfo :+: sig)
             , Carrier (While value :+: Boolean value :+: moduleSig) whileC
             , Carrier (Function term address value :+: While value :+: Boolean value :+: moduleSig) valueC
             , Declarations term
@@ -170,6 +172,7 @@ evaluate lang analyzeModule analyzeTerm modules = do
           . runEnv (EvalContext Nothing (X.push (newEnv preludeBinds)))
           . runReturn
           . runLoopControl
+          . raiseHandler runInterpose
           . raiseHandler runEavesdrop
 
 
diff --git a/src/Data/Abstract/Value/Concrete.hs b/src/Data/Abstract/Value/Concrete.hs
index 1acc043d2..e36b928c3 100644
--- a/src/Data/Abstract/Value/Concrete.hs
+++ b/src/Data/Abstract/Value/Concrete.hs
@@ -10,7 +10,7 @@ module Data.Abstract.Value.Concrete
 import qualified Control.Abstract as Abstract
 import Control.Abstract hiding (Boolean(..), Function(..), While(..))
 import Control.Effect.Carrier
-import Control.Effect.Internal
+import Control.Effect.Interpose
 import Control.Effect.Sum
 import Data.Abstract.BaseError
 import Data.Abstract.Evaluatable (UnspecializedError(..))
@@ -129,10 +129,10 @@ instance ( Carrier sig m
          , Member (Deref (Value term address)) sig
          , Member (Abstract.Boolean (Value term address)) sig
          , Member (Error (LoopControl address)) sig
+         , Member (Interpose (Resumable (BaseError (UnspecializedError (Value term address))))) sig
          , Member (Reader ModuleInfo) sig
          , Member (Reader Span) sig
          , Member (Resumable (BaseError (AddressError address (Value term address)))) sig
-         , Member (Resumable (BaseError (UnspecializedError (Value term address)))) sig
          , Member (State (Heap address (Value term address))) sig
          , Ord address
          , Show address
@@ -142,15 +142,16 @@ instance ( Carrier sig m
   ret = WhileC . ret
   eff = WhileC . (alg \/ eff . handleCoercible)
     where alg = \case
-            Abstract.While cond body k -> interpose @(Resumable (BaseError (UnspecializedError (Value term address))))
-                  (\(Resumable (BaseError _ _ (UnspecializedError _)) _) -> throwError (Abort @address)) (runEvaluator (loop (\continue -> do
+            Abstract.While cond body k -> interpose @(Resumable (BaseError (UnspecializedError (Value term address)))) (runEvaluator (loop (\continue -> do
               cond' <- Evaluator (runWhileC cond)
 
               -- `interpose` is used to handle 'UnspecializedError's and abort out of the
               -- loop, otherwise under concrete semantics we run the risk of the
               -- conditional always being true and getting stuck in an infinite loop.
 
-              ifthenelse cond' (Evaluator (runWhileC body) *> continue) (pure Unit)))) >>= runWhileC . k
+              ifthenelse cond' (Evaluator (runWhileC body) *> continue) (pure Unit))))
+              (\(Resumable (BaseError _ _ (UnspecializedError _)) _) -> throwError (Abort @address))
+                >>= runWhileC . k
             where
               loop x = catchLoopControl @address (fix x) $ \case
                 Break value -> deref value
@@ -161,27 +162,6 @@ instance ( Carrier sig m
                 Continue _  -> loop x
 
 
-interpose :: (Member eff sig, HFunctor eff, Carrier sig m)
-          => (forall v. eff (Eff m) (Eff m v) -> Eff m v)
-          -> Eff m a
-          -> Eff m a
-interpose handler = runInterposeC handler . interpret . upcast
-
-upcast :: Eff m a -> Eff (InterposeC eff (Eff m)) a
-upcast m = Eff (\ k -> InterposeC (\ f -> m >>= runInterposeC f . k))
-
-newtype InterposeC eff m a = InterposeC ((forall x . eff m (m x) -> m x) -> m a)
-
-runInterposeC :: (forall x . eff m (m x) -> m x) -> InterposeC eff m a -> m a
-runInterposeC f (InterposeC m) = m f
-
-instance (Member eff sig, HFunctor eff, Carrier sig m) => Carrier sig (InterposeC eff m) where
-  ret a = InterposeC (const (ret a))
-  eff op
-    | Just e <- prj op = InterposeC (\ handler -> handler (handlePure (runInterposeC handler) e))
-    | otherwise        = InterposeC (\ handler -> eff (handlePure (runInterposeC handler) op))
-
-
 instance AbstractHole (Value term address) where
   hole = Hole
 
diff --git a/vendor/higher-order-effects b/vendor/higher-order-effects
index fb972ef13..9678e1d53 160000
--- a/vendor/higher-order-effects
+++ b/vendor/higher-order-effects
@@ -1 +1 @@
-Subproject commit fb972ef13e529cf0a5ead67c22f69a4e63472ae2
+Subproject commit 9678e1d5325392a23b57a47ddc7a52a5250fb304