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mc14.hs:14:16: error:
Ambiguous type variable ‘t0’ arising from a use of ‘fmap’
prevents the constraint ‘(Functor t0)’ from being solved.
Probable fix: use a type annotation to specify what ‘t0’ should be.
These potential instances exist:
instance Functor IO -- Defined in ‘GHC.Base’
instance Functor Maybe -- Defined in ‘GHC.Base’
instance Functor ((->) r) -- Defined in ‘GHC.Base’
...plus two others
(use -fprint-potential-instances to see them all)
In the expression: fmap
In a stmt of a monad comprehension: then group using f
In the expression: [() | f <- functions, then group using f]
mc14.hs:14:49: error: Variable not in scope: f :: [a] -> m (t0 a)
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