/in/foo.cc: In function 'int trix(int)':
/in/foo.cc:20:12: warning: 'i' may be used uninitialized [-Wmaybe-uninitialized]
   20 |     return i;
      |            ^
/in/foo.cc:6:9: note: 'i' was declared here
    6 |     int i;
      |         ^