Safe Haskell	None
Language	Haskell2010

Control.Effect.Intercept

Contents

Effects
Actions
Interpretations
Interpretations for other effects
Threading constraints
Carriers

Synopsis

data Intercept (e :: Effect) :: Effect where
- Intercept :: Coercible z m => (forall x. e z x -> m x) -> m a -> Intercept e m a
data InterceptCont (e :: Effect) :: Effect where
- InterceptCont :: Coercible z m => InterceptionMode -> (forall x. (x -> m a) -> e z x -> m a) -> m a -> InterceptCont e m a
data InterceptionMode
- = InterceptOne
- | InterceptAll
intercept :: Eff (Intercept e) m => (forall x. e m x -> m x) -> m a -> m a
interceptCont :: Eff (InterceptCont e) m => (forall x. (x -> m a) -> e m x -> m a) -> m a -> m a
interceptCont1 :: Eff (InterceptCont e) m => (forall x. (x -> m a) -> e m x -> m a) -> m a -> m a
runInterceptCont :: forall e m a p. (FirstOrder e, Carrier m, Member e (Derivs m), Threaders '[SteppedThreads] m p) => InterceptContC e m a -> m a
runInterceptR :: forall e m a p. (FirstOrder e, Member e (Derivs m), Carrier m, Threaders '[ReaderThreads] m p) => InterceptRC e m a -> m a
runStateStepped :: forall s m a p. (Carrier m, Threaders '[SteppedThreads] m p) => s -> SteppedC (State s) m a -> m (s, a)
runTellStepped :: forall w m a p. (Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => SteppedC (Tell w) m a -> m (w, a)
runTellListStepped :: forall o m a p. (Carrier m, Threaders '[SteppedThreads] m p) => SteppedC (Tell o) m a -> m ([o], a)
runListenStepped :: forall w m a p. (Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => ListenSteppedC w m a -> m (w, a)
type SteppedThreads = FreeThreads
data InterceptContC e m a
data InterceptRC (e :: Effect) m a
data SteppedC (e :: Effect) m a
data ListenSteppedC w m a

Effects

data Intercept (e :: Effect) :: Effect where Source #

An effect for intercepting actions of a first-order effect.

Even for this library, proper usage of this effect is very complicated. When properly used, this can be a very useful helper effect, allowing you write interpretations for a class of higher-order effects that wouldn't otherwise be possible.

For more information, see the wiki.

Constructors

Intercept :: Coercible z m => (forall x. e z x -> m x) -> m a -> Intercept e m a

Instances

Instances details

(FirstOrder e, Eff (Unravel (InterceptB e)) m) => Handler InterceptH (Intercept e) m Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effHandler :: EffHandler (Intercept e) m Source #

data InterceptCont (e :: Effect) :: Effect where Source #

A variant of InterceptCont that is significantly more powerful, allowing you to capture the continuation of the program at each use-site of an effect, as well as aborting execution of the parameter computation early.

Constructors

InterceptCont :: Coercible z m => InterceptionMode -> (forall x. (x -> m a) -> e z x -> m a) -> m a -> InterceptCont e m a

Instances

Instances details

(FirstOrder e, Member e (Derivs m), Eff (Unravel (InterceptB e)) m) => Handler InterceptH (InterceptCont e) m Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effHandler :: EffHandler (InterceptCont e) m Source #

data InterceptionMode Source #

Constructors

InterceptOne
InterceptAll

Actions

intercept :: Eff (Intercept e) m => (forall x. e m x -> m x) -> m a -> m a Source #

Intercept all uses of an effect within a region.

interceptCont :: Eff (InterceptCont e) m => (forall x. (x -> m a) -> e m x -> m a) -> m a -> m a Source #

Intercept all uses of an effect within a region -- and at each use-site, capture the continuation of the argument computation, and also allow for early abortion (by not invoking the continuation).

interceptCont1 :: Eff (InterceptCont e) m => (forall x. (x -> m a) -> e m x -> m a) -> m a -> m a Source #

Intercept only the first use of an effect within a region -- and at that use-site, capture the continuation of the argument computation, and also allow for early abortion (by not invoking the continuation).

Interpretations

runInterceptCont :: forall e m a p. (FirstOrder e, Carrier m, Member e (Derivs m), Threaders '[SteppedThreads] m p) => InterceptContC e m a -> m a Source #

Run Intercept e, InterceptCont e and e effects, provided that e is first-order and also part of the remaining effect stack.

There are three very important things to note here:

e must be first-order.
Any action of e made by a handler run after runInterceptCont won't get be intercepted. What this means is that you typically want to run the handler for e immediately after runInterceptCont.
This imposes the very restrictive primitive effect Unravel. Most notably, neither StateThreads nor WriterThreads accepts it. Because of that, this module offers various alternatives of several common State and Tell interpreters with threading constraints that do accept Unravel.

Derivs (InterceptContC e m) = InterceptCont e ': Intercept e ': e ': Derivs m

Prims  (InterceptContC e m) = Unravel (InterceptB e) ': Prims m

runInterceptR :: forall e m a p. (FirstOrder e, Member e (Derivs m), Carrier m, Threaders '[ReaderThreads] m p) => InterceptRC e m a -> m a Source #

Run Intercept e and e effects, provided e is first-order and part of the effect stack.

runInterceptR differs from runInterceptCont in four different ways:

It doesn't handle InterceptCont.
It has the significantly less restrictive threading constraint ReaderThreads instead of SteppedThreads
It imposes the significantly more restrictive primitive effect Unlift instead of Unravel.
It is significantly faster.

There are some interpreters -- such as bracketToIO and concToIO -- that runInterceptCont can't be used together with in any capacity due to its SteppedThreads threading constraint. In these cases, runInterceptR can be used instead.

Derivs (InterceptRC e m) = Intercept e ': e ': 'Derivs m'

Prims  (InterceptRC e m) = Unlift (ReaderT (ReifiedFOHandler e m)) ': 'Derivs m'

Interpretations for other effects

runStateStepped :: forall s m a p. (Carrier m, Threaders '[SteppedThreads] m p) => s -> SteppedC (State s) m a -> m (s, a) Source #

A variant of runState with a SteppedThreads threading constraint instead of a StateThreads threading constraint.

runTellStepped :: forall w m a p. (Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => SteppedC (Tell w) m a -> m (w, a) Source #

A variant of runTell with a SteppedThreads threading constraint instead of a StateThreads threading constraint.

runTellListStepped :: forall o m a p. (Carrier m, Threaders '[SteppedThreads] m p) => SteppedC (Tell o) m a -> m ([o], a) Source #

A variant of runTell with a SteppedThreads threading constraint instead of a StateThreads threading constraint.

runListenStepped :: forall w m a p. (Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => ListenSteppedC w m a -> m (w, a) Source #

A variant of runListen with a SteppedThreads threading constraint instead of a StateThreads threading constraint.

Derivs (ListenSteppedC w m) = Listen w ': Tell w ': Derivs m

Prims (ListenSteppedC w m) = ListenPrim w ': Derivs m

Threading constraints

type SteppedThreads = FreeThreads Source #

SteppedThreads accepts the following primitive effects:

Regional s
Optional s (when s is a functor)
Unravel p
ListenPrim o (when o is a Monoid)
ReaderPrim i

Carriers

data InterceptContC e m a Source #

Instances

Instances details

MonadBase b m => MonadBase b (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftBase :: b α -> InterceptContC e m α #
MonadTrans (InterceptContC e) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods lift :: Monad m => m a -> InterceptContC e m a #
Monad (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods (>>=) :: InterceptContC e m a -> (a -> InterceptContC e m b) -> InterceptContC e m b # (>>) :: InterceptContC e m a -> InterceptContC e m b -> InterceptContC e m b # return :: a -> InterceptContC e m a #
Functor (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fmap :: (a -> b) -> InterceptContC e m a -> InterceptContC e m b # (<$) :: a -> InterceptContC e m b -> InterceptContC e m a #
MonadFail m => MonadFail (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fail :: String -> InterceptContC e m a #
Applicative (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods pure :: a -> InterceptContC e m a # (<>) :: InterceptContC e m (a -> b) -> InterceptContC e m a -> InterceptContC e m b # liftA2 :: (a -> b -> c) -> InterceptContC e m a -> InterceptContC e m b -> InterceptContC e m c # (>) :: InterceptContC e m a -> InterceptContC e m b -> InterceptContC e m b # (<*) :: InterceptContC e m a -> InterceptContC e m b -> InterceptContC e m a #
MonadIO m => MonadIO (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftIO :: IO a -> InterceptContC e m a #
MonadThrow m => MonadThrow (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods throwM :: Exception e0 => e0 -> InterceptContC e m a #
MonadCatch m => MonadCatch (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods catch :: Exception e0 => InterceptContC e m a -> (e0 -> InterceptContC e m a) -> InterceptContC e m a #
(FirstOrder e, Carrier m, Member e (Derivs m), Threaders '[SteppedThreads] m p) => Carrier (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Associated Types type Derivs (InterceptContC e m) :: [Effect] Source # type Prims (InterceptContC e m) :: [Effect] Source # Methods algPrims :: Algebra' (Prims (InterceptContC e m)) (InterceptContC e m) a Source # reformulate :: Monad z => Reformulation' (Derivs (InterceptContC e m)) (Prims (InterceptContC e m)) (InterceptContC e m) z a Source # algDerivs :: Algebra' (Derivs (InterceptContC e m)) (InterceptContC e m) a Source #
type Derivs (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Derivs (InterceptContC e m) = Derivs (IntroC '[InterceptCont e, Intercept e] '[Unravel (InterceptB e)] (InterpretC InterceptH (InterceptCont e) (InterpretC InterceptH (Intercept e) (InterpretPrimC InterceptH (Unravel (InterceptB e)) (SteppedC e m)))))
type Prims (InterceptContC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Prims (InterceptContC e m) = Prims (IntroC '[InterceptCont e, Intercept e] '[Unravel (InterceptB e)] (InterpretC InterceptH (InterceptCont e) (InterpretC InterceptH (Intercept e) (InterpretPrimC InterceptH (Unravel (InterceptB e)) (SteppedC e m)))))

data InterceptRC (e :: Effect) m a Source #

Instances

Instances details

MonadBase b m => MonadBase b (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftBase :: b α -> InterceptRC e m α #
MonadBaseControl b m => MonadBaseControl b (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Associated Types type StM (InterceptRC e m) a # Methods liftBaseWith :: (RunInBase (InterceptRC e m) b -> b a) -> InterceptRC e m a # restoreM :: StM (InterceptRC e m) a -> InterceptRC e m a #
MonadTrans (InterceptRC e) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods lift :: Monad m => m a -> InterceptRC e m a #
Monad m => Monad (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods (>>=) :: InterceptRC e m a -> (a -> InterceptRC e m b) -> InterceptRC e m b # (>>) :: InterceptRC e m a -> InterceptRC e m b -> InterceptRC e m b # return :: a -> InterceptRC e m a #
Functor m => Functor (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fmap :: (a -> b) -> InterceptRC e m a -> InterceptRC e m b # (<$) :: a -> InterceptRC e m b -> InterceptRC e m a #
MonadFix m => MonadFix (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods mfix :: (a -> InterceptRC e m a) -> InterceptRC e m a #
MonadFail m => MonadFail (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fail :: String -> InterceptRC e m a #
Applicative m => Applicative (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods pure :: a -> InterceptRC e m a # (<>) :: InterceptRC e m (a -> b) -> InterceptRC e m a -> InterceptRC e m b # liftA2 :: (a -> b -> c) -> InterceptRC e m a -> InterceptRC e m b -> InterceptRC e m c # (>) :: InterceptRC e m a -> InterceptRC e m b -> InterceptRC e m b # (<*) :: InterceptRC e m a -> InterceptRC e m b -> InterceptRC e m a #
MonadIO m => MonadIO (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftIO :: IO a -> InterceptRC e m a #
Alternative m => Alternative (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods empty :: InterceptRC e m a # (<\|>) :: InterceptRC e m a -> InterceptRC e m a -> InterceptRC e m a # some :: InterceptRC e m a -> InterceptRC e m [a] # many :: InterceptRC e m a -> InterceptRC e m [a] #
MonadPlus m => MonadPlus (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods mzero :: InterceptRC e m a # mplus :: InterceptRC e m a -> InterceptRC e m a -> InterceptRC e m a #
MonadThrow m => MonadThrow (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods throwM :: Exception e0 => e0 -> InterceptRC e m a #
MonadCatch m => MonadCatch (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods catch :: Exception e0 => InterceptRC e m a -> (e0 -> InterceptRC e m a) -> InterceptRC e m a #
MonadMask m => MonadMask (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods mask :: ((forall a. InterceptRC e m a -> InterceptRC e m a) -> InterceptRC e m b) -> InterceptRC e m b # uninterruptibleMask :: ((forall a. InterceptRC e m a -> InterceptRC e m a) -> InterceptRC e m b) -> InterceptRC e m b # generalBracket :: InterceptRC e m a -> (a -> ExitCase b -> InterceptRC e m c) -> (a -> InterceptRC e m b) -> InterceptRC e m (b, c) #
(FirstOrder e, Carrier m, Threads (ReaderT (ReifiedFOHandler e m)) (Prims m)) => Carrier (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Associated Types type Derivs (InterceptRC e m) :: [Effect] Source # type Prims (InterceptRC e m) :: [Effect] Source # Methods algPrims :: Algebra' (Prims (InterceptRC e m)) (InterceptRC e m) a Source # reformulate :: Monad z => Reformulation' (Derivs (InterceptRC e m)) (Prims (InterceptRC e m)) (InterceptRC e m) z a Source # algDerivs :: Algebra' (Derivs (InterceptRC e m)) (InterceptRC e m) a Source #
type Derivs (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Derivs (InterceptRC e m) = Intercept e ': (e ': Derivs m)
type Prims (InterceptRC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Prims (InterceptRC e m) = Unlift (ReaderT (ReifiedFOHandler e m) m) ': Prims m
type StM (InterceptRC e m) a Source #
Instance details Defined in Control.Effect.Internal.Intercept type StM (InterceptRC e m) a = StM (ReaderT (ReifiedFOHandler e m) m) a

data SteppedC (e :: Effect) m a Source #

A carrier for any first-order effect e that allows for dividing a computation into several steps, where each step is seperated by the use of the effect.

This can be used to implement coroutines.

Instances

Instances details

(Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => PrimHandler ListenSteppedH (ListenPrim w) (SteppedC (Tell w) m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effPrimHandler :: EffPrimHandler (ListenPrim w) (SteppedC (Tell w) m) Source #
(FirstOrder e, Carrier m, Threaders '[SteppedThreads] m p) => PrimHandler InterceptH (Unravel (InterceptB e)) (SteppedC e m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods effPrimHandler :: EffPrimHandler (Unravel (InterceptB e)) (SteppedC e m) Source #
MonadBase b m => MonadBase b (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods liftBase :: b α -> SteppedC e m α #
MonadTrans (SteppedC e) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods lift :: Monad m => m a -> SteppedC e m a #
Monad (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods (>>=) :: SteppedC e m a -> (a -> SteppedC e m b) -> SteppedC e m b # (>>) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m b # return :: a -> SteppedC e m a #
Functor (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods fmap :: (a -> b) -> SteppedC e m a -> SteppedC e m b # (<$) :: a -> SteppedC e m b -> SteppedC e m a #
MonadFail m => MonadFail (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods fail :: String -> SteppedC e m a #
Applicative (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods pure :: a -> SteppedC e m a # (<>) :: SteppedC e m (a -> b) -> SteppedC e m a -> SteppedC e m b # liftA2 :: (a -> b -> c) -> SteppedC e m a -> SteppedC e m b -> SteppedC e m c # (>) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m b # (<*) :: SteppedC e m a -> SteppedC e m b -> SteppedC e m a #
MonadIO m => MonadIO (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods liftIO :: IO a -> SteppedC e m a #
MonadThrow m => MonadThrow (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods throwM :: Exception e0 => e0 -> SteppedC e m a #
MonadCatch m => MonadCatch (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Methods catch :: Exception e0 => SteppedC e m a -> (e0 -> SteppedC e m a) -> SteppedC e m a #
(Threads (FreeT (FOEff e)) (Prims m), Carrier m) => Carrier (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped Associated Types type Derivs (SteppedC e m) :: [Effect] Source # type Prims (SteppedC e m) :: [Effect] Source # Methods algPrims :: Algebra' (Prims (SteppedC e m)) (SteppedC e m) a Source # reformulate :: Monad z => Reformulation' (Derivs (SteppedC e m)) (Prims (SteppedC e m)) (SteppedC e m) z a Source # algDerivs :: Algebra' (Derivs (SteppedC e m)) (SteppedC e m) a Source #
type Derivs (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped type Derivs (SteppedC e m) = e ': Derivs m
type Prims (SteppedC e m) Source #
Instance details Defined in Control.Effect.Carrier.Internal.Stepped type Prims (SteppedC e m) = Prims m

data ListenSteppedC w m a Source #

Instances

Instances details

MonadBase b m => MonadBase b (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftBase :: b α -> ListenSteppedC w m α #
MonadTrans (ListenSteppedC w) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods lift :: Monad m => m a -> ListenSteppedC w m a #
Monad (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods (>>=) :: ListenSteppedC w m a -> (a -> ListenSteppedC w m b) -> ListenSteppedC w m b # (>>) :: ListenSteppedC w m a -> ListenSteppedC w m b -> ListenSteppedC w m b # return :: a -> ListenSteppedC w m a #
Functor (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fmap :: (a -> b) -> ListenSteppedC w m a -> ListenSteppedC w m b # (<$) :: a -> ListenSteppedC w m b -> ListenSteppedC w m a #
MonadFail m => MonadFail (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods fail :: String -> ListenSteppedC w m a #
Applicative (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods pure :: a -> ListenSteppedC w m a # (<>) :: ListenSteppedC w m (a -> b) -> ListenSteppedC w m a -> ListenSteppedC w m b # liftA2 :: (a -> b -> c) -> ListenSteppedC w m a -> ListenSteppedC w m b -> ListenSteppedC w m c # (>) :: ListenSteppedC w m a -> ListenSteppedC w m b -> ListenSteppedC w m b # (<*) :: ListenSteppedC w m a -> ListenSteppedC w m b -> ListenSteppedC w m a #
MonadIO m => MonadIO (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods liftIO :: IO a -> ListenSteppedC w m a #
MonadThrow m => MonadThrow (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods throwM :: Exception e => e -> ListenSteppedC w m a #
MonadCatch m => MonadCatch (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Methods catch :: Exception e => ListenSteppedC w m a -> (e -> ListenSteppedC w m a) -> ListenSteppedC w m a #
(Monoid w, Carrier m, Threaders '[SteppedThreads] m p) => Carrier (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept Associated Types type Derivs (ListenSteppedC w m) :: [Effect] Source # type Prims (ListenSteppedC w m) :: [Effect] Source # Methods algPrims :: Algebra' (Prims (ListenSteppedC w m)) (ListenSteppedC w m) a Source # reformulate :: Monad z => Reformulation' (Derivs (ListenSteppedC w m)) (Prims (ListenSteppedC w m)) (ListenSteppedC w m) z a Source # algDerivs :: Algebra' (Derivs (ListenSteppedC w m)) (ListenSteppedC w m) a Source #
type Derivs (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Derivs (ListenSteppedC w m) = Derivs (ReinterpretC ListenSteppedH (Listen w) '[ListenPrim w] (InterpretPrimC ListenSteppedH (ListenPrim w) (SteppedC (Tell w) m)))
type Prims (ListenSteppedC w m) Source #
Instance details Defined in Control.Effect.Internal.Intercept type Prims (ListenSteppedC w m) = Prims (ReinterpretC ListenSteppedH (Listen w) '[ListenPrim w] (InterpretPrimC ListenSteppedH (ListenPrim w) (SteppedC (Tell w) m)))