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T14904a.hs:10:6: error:
• Expected kind ‘forall (a :: k1). g a’, but ‘f’ has kind ‘k’
Cannot equate type variable ‘k’
with a kind involving polytypes: forall (a :: k1). g a
‘k’ is a rigid type variable bound by
a family instance declaration
at T14904a.hs:10:3-30
• In the first argument of ‘F’, namely ‘(f :: forall a. g a)’
In the type family declaration for ‘F’
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