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T4179.hs:26:16: error:
• Couldn't match type ‘A2 (x (A2 (FCon x) -> A3 (FCon x)))’
with ‘A2 (FCon x)’
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)))
NB: ‘A2’ is a type function, and may not be injective
• In the first argument of ‘foldDoC’, namely ‘op’
In the expression: foldDoC op
In an equation for ‘fCon’: fCon = foldDoC op
• Relevant bindings include
fCon :: Con x -> A2 (FCon x) -> A3 (FCon x)
(bound at T4179.hs:26:1)
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