Include in Rust 1.55

In Rust 1.55, you can check if an array includes an element using the contains method.

Here is an example:

let arr = [1, 2, 3, 4, 5];
if arr.contains(&3) {

    println!("The array contains the number 3!");

} else {

    println!("The array does not contain the number 3.");

}

In this example, we have an array called arr containing the numbers 1 through 5. We use the contains method to check if the array contains the number 3. Since the array does contain the number 3, the first branch of the if statement is executed and "The array contains the number 3!" is printed to the console.

Note that the argument passed to contains is a reference to the element being searched for (&3 in our example). This is because the elements in the array are not moved in or out of the array during the search.