/in/foo.cc: In function 'int fz(int, int, int)':
/in/foo.cc:27:8: warning: statement has no effect [-Wunused-value]
     mid+1;
     ~~~^~
/in/foo.cc:29:8: warning: statement has no effect [-Wunused-value]
     mid-1;
     ~~~^~
/in/foo.cc:33:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^