#include <generator>
#include <print>

std::generator<unsigned int> fib() {
    unsigned int a = 0, b = 1;
    while (true) {
        co_yield a;
        auto next = a + b;
        a = b;
        b = next;
    }
}

int main(){ 
    int count = 10;
    for (auto x : fib()) {
        std::print("fib: {}\n", x);
        if (--count == 0) break;
    }
}