/in/foo.cc: In function 'int unionn(int, int)':
/in/foo.cc:36:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int ufs_init()':
/in/foo.cc:41:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^