Guess the output...

inout-test.swift

func test1(inout v:[Int], inout _ x:Int) {
    v[0] += 1;
    x += 1;
}

func test2(inout v:[Int], inout _ x:Int) {
    v[0] += 1;
    v.append(20);
    x += 1;
}

var a = [10];
test1(&a, &a[0]);

var b = [10];
test2(&b, &b[0]);

print(a[0], b[0]);