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FD2.hs:26:38:
Could not deduce (e1 ~ e)
from the context (Foldable a)
bound by the class declaration for `Foldable'
at FD2.hs:(17,1)-(26,39)
or from (Elem a e)
bound by the type signature for
foldr1 :: Elem a e => (e -> e -> e) -> a -> e
at FD2.hs:(22,3)-(26,39)
or from (Elem a e1)
bound by the type signature for
mf :: Elem a e1 => e1 -> Maybe e1 -> Maybe e1
at FD2.hs:(25,12)-(26,39)
`e1' is a rigid type variable bound by
the type signature for
mf :: Elem a e1 => e1 -> Maybe e1 -> Maybe e1
at FD2.hs:25:12
`e' is a rigid type variable bound by
the type signature for
foldr1 :: Elem a e => (e -> e -> e) -> a -> e
at FD2.hs:22:3
In the second argument of `f', namely `y'
In the first argument of `Just', namely `(f x y)'
In the expression: Just (f x y)
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