assertEq((1, 2), (1, 2))

assertEq(typeof((1,)), typeof((1,)))
assertEq((1,), (1,))

fn neighbours(n: int) -> (int, int) {
    (n-1, n+1)
}

assertEq(neighbours(2), (1, 3))

a := (1, 2)
assertEq(a, (1, 2))

(x, y) := a
assertEq(x, 1)
assertEq(y, 2)