typedef A = (int x, int y);

() test() {
    var A a;
    var (int x, int y) b;
    var (int x, int y) c;
    var (int, int) d;
    
    a = b;
    a = c;
    a = d;
    
    b = a;
    b = c;
    b = d;
    
    c = a;
    c = b;
    c = d;
    
    d = a;
    d = b;
    d = c;
    
    short sh = 2;
    a = (1, sh);
}