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Trying define maybe-subtype......
author atton <atton@cr.ie.u-ryukyu.ac.jp>
date Thu, 12 Jan 2017 02:48:09 +0000
parents fe247f476ecb
children
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module systemT where

data Bool : Set where
  T : Bool
  F : Bool

data Int : Set where
  O : Int
  S : Int -> Int

R : {U : Set} -> U -> (U -> (Int -> U)) -> Int -> U
R u v O = u
R u v (S t) = v (R u v t) t

D : {U : Set} -> U -> U -> Bool -> U
D u v F = v
D u v T = u