#include <cassert>
#include <string>

int main() {
    int a = 3;
    int b = 8;
    int& alias = a;
    alias = b;
    assert(a == 8);
    assert(&alias == &a);
    b = 10;
    assert(alias == 8);
    const std::string& text = std::string(3, 'x');
    assert(text == "xxx");
}