{-# htermination (error :: (List Char)  ->  a) #-} 
import qualified Prelude 
data MyInt = Pos Nat  | Neg Nat ;
data Nat = Succ Nat  | Zero ;
data MyBool = MyTrue | MyFalse 
data List a = Cons a (List a) | Nil 
data Char = Char MyInt ;

stop :: MyBool  ->  a;
stop MyFalse = stop MyFalse;

error :: a;
error = stop MyTrue;