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T15859a.hs:19:26: error:
• Expected kind ‘k0’, but ‘A’ has kind ‘forall k -> k -> *’
Cannot instantiate unification variable ‘k0’
with a kind involving polytypes: forall k -> k -> *
• In the first argument of ‘KindOf’, namely ‘A’
In an expression type signature: KindOf A
In the expression: undefined :: KindOf A
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