/in/foo.cc: In function 'int main()':
/in/foo.cc:5:6: warning: unused variable 'x' [-Wunused-variable]
  int x, y, z;
      ^
/in/foo.cc:5:9: warning: unused variable 'y' [-Wunused-variable]
  int x, y, z;
         ^
/in/foo.cc:5:12: warning: unused variable 'z' [-Wunused-variable]
  int x, y, z;
            ^