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T2714.hs:8:5:
Couldn't match type `a' with `f0 b'
`a' is a rigid type variable bound by
the type signature for f :: ((a -> b) -> b) -> forall c. c -> a
at T2714.hs:8:1
Expected type: ((a -> b) -> b) -> c -> a
Actual type: ((a -> b) -> b) -> f0 (a -> b) -> f0 b
In the expression: ffmap
In an equation for `f': f = ffmap
T2714.hs:8:5:
Couldn't match type `c' with `f0 (f0 b -> b)'
`c' is a rigid type variable bound by
the type signature for f :: ((a -> b) -> b) -> c -> a
at T2714.hs:8:1
Expected type: c
Actual type: f0 (a -> b)
Expected type: ((a -> b) -> b) -> c -> a
Actual type: ((a -> b) -> b) -> f0 (a -> b) -> f0 b
In the expression: ffmap
In an equation for `f': f = ffmap
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