#unittest {
	name: "Fibers scheduling.";
	result: "abcbcbcbcbcbcbcbcd";
};

func main() {
    var g = "a";
    var n = 8;
    
    var task1 = Fiber.create({
        for (var i in 1...n) {g += "b"; Fiber.yield();}
    });
    
    var task2 = Fiber.create({
        for (var i in 1...n) {g += "c"; Fiber.yield();}
    });
    
    for (var i in 1...n) {task1.call(); task2.call();}
    
    g += "d";
    return g;
}