How to use the sanctuary-type-classes.Alt function in sanctuary-type-classes

test ('Alt', () => {
    eq (Z.Alt.test (Identity ([]))) (false);
  });

test ('Alt', () => {
    eq (Z.Alt.test (Left (Useless))) (true);
    eq (Z.Alt.test (Right (Useless))) (true);
  });

test ('Alt', () => {
    eq (Z.Alt.test (Left (Useless))) (true);
    eq (Z.Alt.test (Right (Useless))) (true);
  });

test ('Alt', () => {
    eq (Z.Alt.test (Nothing)) (true);
    eq (Z.Alt.test (Just (Useless))) (true);
  });

test ('Alt', () => {
    eq (Z.Alt.test (Nothing)) (true);
    eq (Z.Alt.test (Just (Useless))) (true);
  });

function alt$left(left, right){
  if(!Z.Alt.test(right)) throwInvalidArgument('alt', 1, 'be an Alt', right);
  return Z.alt(left, right);
}

distributivity: assert.forall3 (function(a, b, f) {
      return Z.Alt.test (a) &&
             Z.Alt.test (b) &&
             equals (map (f) (alt (a) (b)),
                     alt (map (f) (a)) (map (f) (b)));
    })

associativity: assert.forall3 (function(a, b, c) {
      return Z.Alt.test (a) &&
             Z.Alt.test (b) &&
             Z.Alt.test (c) &&
             equals (alt (alt (a) (b)) (c),
                     alt (a) (alt (b) (c)));
    }),