/in/foo.cc: In function 'int main()':
/in/foo.cc:39:13: warning: unused variable 'q' [-Wunused-variable]
  int i = 1, q, w;
             ^
/in/foo.cc:39:16: warning: unused variable 'w' [-Wunused-variable]
  int i = 1, q, w;
                ^