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T4093b.hs:31:13:
Could not deduce (e ~ C)
from the context (EitherCO e (A C O n) (A O O n) ~ A e O n,
EitherCO x (A C C n) (A C O n) ~ A C x n)
bound by the type signature for
blockToNodeList :: (EitherCO e (A C O n) (A O O n) ~ A e O n,
EitherCO x (A C C n) (A C O n) ~ A C x n) =>
Block n e x -> A e x n
at T4093b.hs:(25,1)-(34,19)
`e' is a rigid type variable bound by
the type signature for
blockToNodeList :: (EitherCO e (A C O n) (A O O n) ~ A e O n,
EitherCO x (A C C n) (A C O n) ~ A C x n) =>
Block n e x -> A e x n
at T4093b.hs:25:1
Expected type: EitherCO e (A C O n) (A O O n)
Actual type: (MaybeC C (n C O), MaybeC O (n O C))
In the expression: (JustC n, NothingC)
In an equation for `f': f n _ = (JustC n, NothingC)
In an equation for `blockToNodeList':
blockToNodeList b
= foldBlockNodesF (f, l) b z
where
z ::
EitherCO e (EitherCO e (A C O n) (A O O n)) (EitherCO e (A C O n) (A O O n))
z = undefined
f ::
n C O
-> EitherCO e (A C O n) (A O O n) -> EitherCO e (A C O n) (A O O n)
f n _ = (JustC n, NothingC)
....
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