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mc25.hs:9:24:
No instance for (Functor t1) arising from a use of ‘fmap’
Possible fix:
add (Functor t1) to the context of
a type expected by the context: (a -> b) -> t1 a -> t1 b
or the inferred type of z :: [t1 t]
In the expression: fmap
In a stmt of a monad comprehension: then group by x using take
In the expression: [x | x <- [1 .. 10], then group by x using take]
mc25.hs:9:46:
Couldn't match type ‘Int’ with ‘a -> t’
Expected type: (a -> t) -> [a] -> [t1 a]
Actual type: Int -> [a] -> [a]
Relevant bindings include z :: [t1 t] (bound at mc25.hs:9:1)
In the expression: take
In a stmt of a monad comprehension: then group by x using take
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