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T2714.hs:8:7: error: [GHC-25897]
• Couldn't match type ‘c’ with ‘f0 (a -> b)’
Expected: c -> a
Actual: f0 (a -> b) -> f0 b
‘c’ is a rigid type variable bound by
a type expected by the context:
forall c. c -> a
at T2714.hs:8:1-13
• In the expression: ffmap x
In an equation for ‘f’: f x = ffmap x
• Relevant bindings include
x :: (a -> b) -> b (bound at T2714.hs:8:3)
f :: ((a -> b) -> b) -> forall c. c -> a (bound at T2714.hs:8:1)
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