/in/foo.cc: In function 'int main()':
/in/foo.cc:11:10: warning: 'l' may be used uninitialized [-Wmaybe-uninitialized]
   11 |         l+=1;
      |         ~^~~
/in/foo.cc:8:9: note: 'l' was declared here
    8 |     int l;
      |         ^