1 sizeof (ringbearer_t) = 8
   2 0 ringbearer_t {
   3     0 int frodo 
   4     0 char sam 
   5     0 long gandalf 
   6 }
   7 sizeof (union ringbearer) = 8
   8 0 union ringbearer {
   9     0 int frodo 
  10     0 char sam 
  11     0 long gandalf 
  12 }