Everything-I-Know-About-Types/logict
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Fix StateT and ReaderT interleave instances

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This commit is contained in:
Danila Fedorin 2023-03-11 23:35:55 -08:00
parent 95c83a1ec0
commit 398fccecf0
1 changed files with 2 additions and 2 deletions
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4
src/Control/Monad/Logic/Class.purs
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@ -31,11 +31,11 @@ instance MonadLogic m => MonadLogic (StateT s m) where
case r of
Nothing -> pure (Nothing /\ s)
Just ((a /\ s') /\ m) -> pure (Just (a /\ (StateT $ const m)) /\ s')
interleave m1 m2 = StateT $ \s -> runStateT m1 s <|> runStateT m2 s
interleave m1 m2 = StateT $ \s -> runStateT m1 s `interleave` runStateT m2 s
instance MonadLogic m => MonadLogic (ReaderT r m) where
msplit sm = ReaderT $ \r -> do
msplit (runReaderT sm r) >>= case _ of
Nothing -> pure Nothing
Just (a /\ m) -> pure $ Just $ a /\ (ReaderT $ const m)
interleave m1 m2 = ReaderT $ \r -> runReaderT m1 r <|> runReaderT m2 r
interleave m1 m2 = ReaderT $ \r -> runReaderT m1 r `interleave` runReaderT m2 r