Created
May 18, 2018 10:36
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Applicative/Monad pure compilation issues
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| ffBench.hs:34:25: | |
| Could not deduce (Applicative m) arising from a use of ‘pure’ | |
| from the context (Monad m) | |
| bound by a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m b | |
| at EffBench.hs:(33,20)-(34,34) | |
| Possible fix: | |
| add (Applicative m) to the context of | |
| a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m b | |
| or the type signature for fmap :: (a -> b) -> VSM s a -> VSM s b | |
| or the instance declaration | |
| In the expression: pure (f a) | |
| In the second argument of ‘(>>=)’, namely ‘\ a -> pure (f a)’ | |
| In the expression: g get put >>= \ a -> pure (f a) | |
| EffBench.hs:38:30: | |
| Could not deduce (Applicative m) arising from a use of ‘pure’ | |
| from the context (Functor (VSM s)) | |
| bound by the instance declaration at EffBench.hs:37:10-28 | |
| or from (Monad m) | |
| bound by a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m a | |
| at EffBench.hs:38:12-35 | |
| Possible fix: | |
| add (Applicative m) to the context of | |
| a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m a | |
| or the type signature for pure :: a -> VSM s a | |
| or the instance declaration | |
| In the expression: pure a | |
| In the second argument of ‘($)’, namely ‘\ get put -> pure a’ | |
| In the expression: VSM $ \ get put -> pure a | |
| EffBench.hs:41:26: | |
| Could not deduce (Applicative m) arising from a use of ‘pure’ | |
| from the context (Functor (VSM s)) | |
| bound by the instance declaration at EffBench.hs:37:10-28 | |
| or from (Monad m) | |
| bound by a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m b | |
| at EffBench.hs:(39,23)-(41,35) | |
| Possible fix: | |
| add (Applicative m) to the context of | |
| a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m b | |
| or the type signature for | |
| (<*>) :: VSM s (a -> b) -> VSM s a -> VSM s b | |
| or the instance declaration | |
| In the expression: pure (f a) | |
| In the second argument of ‘(>>=)’, namely ‘\ a -> pure (f a)’ | |
| In the expression: ma get put >>= \ a -> pure (f a) | |
| EffBench.hs:46:32: | |
| Could not deduce (Applicative m) arising from a use of ‘pure’ | |
| from the context (Monad m) | |
| bound by a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m a | |
| at EffBench.hs:46:14-37 | |
| Possible fix: | |
| add (Applicative m) to the context of | |
| a type expected by the context: | |
| Monad m => m s -> (s -> m ()) -> m a | |
| or the type signature for return :: a -> VSM s a | |
| or the instance declaration | |
| In the expression: pure a | |
| In the second argument of ‘($)’, namely ‘\ get put -> pure a’ | |
| In the expression: VSM $ \ get put -> pure a |
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