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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:7:6
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
Relevant bindings include
f :: ((a -> b) -> b) -> forall c. c -> a (bound at T2714.hs:8:1)
T2714.hs:8:5:
Couldn't match type ‘c’ with ‘f0 (a -> 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: ((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
Relevant bindings include
f :: ((a -> b) -> b) -> forall c. c -> a (bound at T2714.hs:8:1)
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