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Merged
coot merged 1 commit into from
Apr 17, 2026
Merged

Remove withLiftST #255

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2 changes: 2 additions & 0 deletions io-classes/CHANGELOG.md
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Expand Up @@ -4,6 +4,8 @@

### Breaking changes

- Removed the deprecated `withLiftST` (deprecated since `io-classes-1.5.0.0`).

### Non-breaking changes

## 1.10.1.0
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9 changes: 0 additions & 9 deletions io-classes/io-classes/Control/Monad/Class/MonadST.hs
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Expand Up @@ -37,21 +37,12 @@ class PrimMonad m => MonadST m where
-- | @since 1.4.1.0
stToIO :: ST (PrimState m) a -> m a

-- | Deprecated. Use 'stToIO' instead.
withLiftST :: (forall s. (forall a. ST s a -> m a) -> b) -> b
withLiftST = \k -> k stToIO

{-# DEPRECATED withLiftST "Use the simpler 'stToIO' instead." #-}

instance MonadST IO where
stToIO = stToPrim

instance MonadST (ST s) where
stToIO = stToPrim
withLiftST = \f -> f id

instance (MonadST m, PrimMonad m) => MonadST (ReaderT r m) where
stToIO :: ST (PrimState m) a -> ReaderT r m a
stToIO f = lift (stToPrim f)

withLiftST f = withLiftST $ \g -> f (lift . g)
8 changes: 0 additions & 8 deletions io-classes/mtl/Control/Monad/Class/MonadST/Trans.hs
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Expand Up @@ -17,32 +17,24 @@ import Control.Monad.Class.MonadST

instance MonadST m => MonadST (ContT r m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance MonadST m => MonadST (ExceptT e m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance (Monoid w, MonadST m) => MonadST (Lazy.RWST r w s m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance (Monoid w, MonadST m) => MonadST (Strict.RWST r w s m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance MonadST m => MonadST (Lazy.StateT s m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance MonadST m => MonadST (Strict.StateT s m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance (Monoid w, MonadST m) => MonadST (Lazy.WriterT w m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)

instance (Monoid w, MonadST m) => MonadST (Strict.WriterT w m) where
stToIO = lift . stToIO
withLiftST f = withLiftST $ \g -> f (lift . g)
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