{

    var b = "A";
    b += "B";
    print(b); # expect: AB

    var a = 5;
    print(a); # expect: 5
    a = 6;
    print(a); # expect: 6
    a *= 2;
    print(a); # expect: 12
    a *= "Test"; # expect runtime error: Operands must be numbers. Got: [12, Test]
}