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Created January 4, 2019 17:55
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typeable31.hs
dynApply :: Dynamic -> Dynamic -> Maybe Dynamic
dynApply (Dyn (TrApp (TrApp tr targ) tres) fun) (Dyn targ' arg)
| Just HRefl <- eqT tr (typeRep :: TypeRep (->))
, Just HRefl <- eqT targ targ'
= Just (Dyn tres (fun arg))
dynApply _ _ = Nothing
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