/in/foo.c: In function 'Merge':
/in/foo.c:29:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'in':
/in/foo.c:36:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^