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fix
author kono
date Thu, 22 Feb 2018 12:04:21 +0900
parents 28f900230c26
children
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line source

_==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_}