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T3330c.hs:25:43: error:
• Couldn't match kind ‘*’ with ‘* -> *’
When matching types
f1 :: * -> *
f1 x :: *
Expected type: Der ((->) x) (f1 x)
Actual type: R f1
• In the first argument of ‘plug’, namely ‘rf’
In the first argument of ‘Inl’, namely ‘(plug rf df x)’
In the expression: Inl (plug rf df x)
• Relevant bindings include
x :: x (bound at T3330c.hs:25:29)
df :: f1 x (bound at T3330c.hs:25:25)
rf :: R f1 (bound at T3330c.hs:25:13)
plug' :: R f -> Der f x -> x -> f x (bound at T3330c.hs:25:1)
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