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T9858a.hs:28:18: error:
No instance for (Typeable
((() :: Constraint, () :: Constraint) => ()))
arising from a use of ‘cast’
(maybe you haven't applied a function to enough arguments?)
In the expression: cast e
In the expression: case cast e of { Just e' -> ecast e' }
In an equation for ‘supercast’:
supercast
= case cast e of { Just e' -> ecast e' }
where
e = Refl
e :: E PX PX
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