/in/foo.cc: In member function 'overload overload::operator/(const int&)':
/in/foo.cc:51:7: warning: unused variable 'len' [-Wunused-variable]
   int len = y.data[0];
       ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:39:13: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized]
   y.data[len]?y.data[0] = len:y.data[0] = --len;
   ~~~~~~~~~~^
/in/foo.cc:32:7: note: 'len' was declared here
   int len;
       ^~~