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T15807.hs:12:3: error:
• Cannot generalise type; skolem ‘f’ would escape its scope
if I tried to quantify (f0 :: f -> *) in this type:
forall f (a :: f). f a %1 -> App @f @f0 a
(Indeed, I sometimes struggle even printing this correctly,
due to its ill-scoped nature.)
• In the definition of data constructor ‘MkApp’
In the data declaration for ‘App’
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