/in/foo.cc: In function 'int main()':
/in/foo.cc:24:9: warning: unused variable 'x' [-Wunused-variable]
     int x = 0, y = 0;
         ^
/in/foo.cc:24:16: warning: unused variable 'y' [-Wunused-variable]
     int x = 0, y = 0;
                ^