class MyList {
    __init__() {
        this.data = [5,4,3,2,1];
    }

    __iter__() {
        return MyIterator(this);
    }
}

class MyIterator {
    __init__(list) {
        this.list = list;
        this.index = 0;
    }

    __next__() {
        if (this.index < len(this.list.data)) {
            var result = this.list.data[this.index];
            this.index += 1;
            return result;
        } else {
            return StopIteration;
        }
    }
}

fun outer() {
    fun middle() {
        fun inner() {
            var my_list = MyList();

            foreach (var val in my_list) {
                print(val); 
            }
        }
        inner();
    }
    middle();
}

outer(); # expect: 5
         # expect: 4
         # expect: 3
         # expect: 2
         # expect: 1

fun fibo() {
    foreach (var val in [1,1,2,3,5,8]) {
        if (val == 2) {
            continue;
        }
        if (val == 8) {
            break;
        }
        print(val);
    }
}

fibo(); # expect: 1
        # expect: 1
        # expect: 3
        # expect: 5

foreach (var val in []) {}