Macro assert_nth_scalar 

macro_rules! assert_nth_scalar {
    ($arr:expr, $n:expr, $expected:expr) => { ... };
}

Asserts that the scalar at position $n in array $arr equals $expected.

This is a convenience macro for testing that avoids verbose scalar comparison code.

Example

let arr = PrimitiveArray::from_iter([1, 2, 3]);
assert_nth_scalar!(arr, 0, 1);
assert_nth_scalar!(arr, 1, 2);