{-# htermination (esEsChar :: Char -> Char -> MyBool) #-} import qualified Prelude data MyBool = MyTrue | MyFalse data List a = Cons a (List a) | Nil data Char = Char MyInt ; data MyInt = Pos Nat | Neg Nat ; data Nat = Succ Nat | Zero ; primEqNat :: Nat -> Nat -> MyBool; primEqNat Zero Zero = MyTrue; primEqNat Zero (Succ y) = MyFalse; primEqNat (Succ x) Zero = MyFalse; primEqNat (Succ x) (Succ y) = primEqNat x y; primEqInt :: MyInt -> MyInt -> MyBool; primEqInt (Pos (Succ x)) (Pos (Succ y)) = primEqNat x y; primEqInt (Neg (Succ x)) (Neg (Succ y)) = primEqNat x y; primEqInt (Pos Zero) (Neg Zero) = MyTrue; primEqInt (Neg Zero) (Pos Zero) = MyTrue; primEqInt (Neg Zero) (Neg Zero) = MyTrue; primEqInt (Pos Zero) (Pos Zero) = MyTrue; primEqInt vv vw = MyFalse; primEqChar :: Char -> Char -> MyBool; primEqChar (Char x) (Char y) = primEqInt x y; esEsChar :: Char -> Char -> MyBool esEsChar = primEqChar;