/in/foo.cc: In function 'int main()':
/in/foo.cc:12:4: warning: statement has no effect [-Wunused-value]
   a/2;
   ~^~
/in/foo.cc:17:4: warning: statement has no effect [-Wunused-value]
   a/3;
   ~^~
/in/foo.cc:22:4: warning: statement has no effect [-Wunused-value]
   a/5;
   ~^~
/in/foo.cc:27:4: warning: statement has no effect [-Wunused-value]
   a/7;
   ~^~
/in/foo.cc:32:4: warning: statement has no effect [-Wunused-value]
   a/13;
   ~^~~