/in/foo.cc: In function 'int main()':
/in/foo.cc:93:23: warning: 's' may be used uninitialized [-Wmaybe-uninitialized]
   93 |                 getdfn(s, 0);
      |                 ~~~~~~^~~~~~
/in/foo.cc:90:61: note: 's' was declared here
   90 |                 getloop(1); memset(dfn, 0, sizeof dfn); int s;
      |                                                             ^