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view final_pre/src/AgdaInstance.agda @ 7:28f900230c26

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add final_pre
author ryokka
date Mon, 19 Feb 2018 23:32:24 +0900
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_==Nat_ : Nat -> Nat -> Bool
zero    ==Nat zero    = true
(suc n) ==Nat zero    = false
zero    ==Nat (suc m) = false
(suc n) ==Nat (suc m) = n ==Nat m

instance
  natHas== : Eq Nat
  natHas== = record { _==_ = _==Nat_}