main = head (Cons (sum (repeat 5 9223372036854775807)) Nil);  --9223372036854775807

-- main = case (bind (fmap (\s . s + 1) (Just 5)) (\s . pure (s + 10))) of {
--     Just a => a ;
--     Nothing => minusOne ;
-- };

---- MAYBE MONAD ----
data Maybe () where {
    Just : Int -> Maybe ()
    Nothing : Maybe ()
};

fmap : (Int -> Int) -> Maybe () -> Maybe () ;
fmap f m = case m of {
    Just a => pure (f a) ;
    Nothing => Nothing ;
};

pure : Int -> Maybe () ;
pure x = Just x;

-- scombinator not working yet :)

bind : Maybe () -> (Int -> Maybe ()) -> Maybe () ;
bind x f = case x of {
    Just x => f x ;
    Nothing => Nothing ;