Added default functions, isEmpty does not typecheck...

[cc1516.git] / RWST.dcl

diff --git a/RWST.dcl b/RWST.dcl
index 334df7e..582bb0d 100644 (file)
--- a/RWST.dcl
+++ b/RWST.dcl
@@ -2,7 +2,7 @@ definition module RWST
 
 from Control.Applicative import class Applicative
 from Control.Monad import class Monad
-from Data.Void import :: Void
+from Control.Monad.Trans import class MonadTrans
 from Data.Functor import class Functor
 from Data.Functor.Identity import :: Identity
 from Data.Monoid import class Monoid, class Semigroup
@@ -23,6 +23,7 @@ withRWS :: (r` s -> (r, s)) (RWS r w s a) -> RWS r` w s a
 instance Functor (RWST r w s m) | Monad m & Monoid w
 instance Applicative (RWST r w s m) | Monad m & Monoid w
 instance Monad (RWST r w s m) | Monad m & Monoid w
+instance MonadTrans (RWST r w s) | Monoid w
 
 runRWST :: (RWST r w s m a) r s -> m (a, s, w)
 evalRWST :: (RWST r w s m a) r s -> m (a, w) | Monad m
@@ -36,7 +37,7 @@ local :: (r -> r) (RWST r w s m a) -> RWST r w s m a | Monoid w & Monad m
 asks :: (r -> a) -> RWST r w s m a | Monoid w & Monad m
 
 // Writer operations
-tell :: w -> RWST r w s m Void | Monoid w & Monad m
+tell :: w -> RWST r w s m () | Monoid w & Monad m
 listen :: (RWST r w s m a) -> RWST r w s m (a, w) | Monoid w & Monad m
 pass :: (RWST r w s m (a, w -> w)) -> RWST r w s m a | Monoid w & Monad m
 listens :: (w -> b) (RWST r w s m a) -> RWST r w s m (a, b)| Monoid w & Monad m
@@ -44,8 +45,8 @@ censor :: (w -> w) (RWST r w s m a) -> RWST r w s m a | Monoid w & Monad m
 
 // State operations
 get :: RWST r w s m s | Monoid w & Monad m
-put :: s -> RWST r w s m Void | Monoid w & Monad m
-modify :: (s -> s) -> RWST r w s m Void | Monoid w & Monad m
+put :: s -> RWST r w s m () | Monoid w & Monad m
+modify :: (s -> s) -> RWST r w s m () | Monoid w & Monad m
 gets :: (s -> a) -> RWST r w s m a | Monoid w & Monad m
 
 // Lifting other operations