/in/foo.cc: In function 'int main()':
/in/foo.cc:38:6: warning: unused variable 'l1' [-Wunused-variable]
  int l1(1),l2(1);
      ^~
/in/foo.cc:38:12: warning: unused variable 'l2' [-Wunused-variable]
  int l1(1),l2(1);
            ^~