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Self review
author atton <atton@cr.ie.u-ryukyu.ac.jp>
date Sun, 12 Feb 2017 11:52:20 +0900
parents fb42478e4c96
children
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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_}