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T4179.hs:26:16:
Could not deduce (A3 (x (A2 (FCon x) -> A3 (FCon x)))
~ A3 (FCon x))
from the context (Functor x, DoC (FCon x))
bound by the type signature for
fCon :: (Functor x, DoC (FCon x)) =>
Con x -> A2 (FCon x) -> A3 (FCon x)
at T4179.hs:25:9-72
NB: ‘A3’ is a type function, and may not be injective
Expected type: x (A2 (FCon x) -> A3 (FCon x))
-> A2 (FCon x) -> A3 (FCon x)
Actual type: x (A2 (FCon x) -> A3 (FCon x))
-> A2 (x (A2 (FCon x) -> A3 (FCon x)))
-> A3 (x (A2 (FCon x) -> A3 (FCon x)))
Relevant bindings include
fCon :: Con x -> A2 (FCon x) -> A3 (FCon x)
(bound at T4179.hs:26:1)
In the first argument of ‘foldDoC’, namely ‘op’
In the expression: foldDoC op
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