/in/foo.cc: In function 'int auto_gen(int, int, int)':
/in/foo.cc:13:3: error: return-statement with no value, in function returning 'int' [-fpermissive]
   return;
   ^~~~~~
/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:22:1: error: expected ';' before '}' token
 }
 ^