/in/foo.cc: In function 'int main()':
/in/foo.cc:15:9: warning: unused variable 'x' [-Wunused-variable]
     int x = 1, y = 1;
         ^
/in/foo.cc:15:16: warning: unused variable 'y' [-Wunused-variable]
     int x = 1, y = 1;
                ^