BugBase
  (m) public abstract A BugBase.key()
  (m) public abstract E BugBase.next()
  (m) public abstract void BugBase.next_$eq(E)
Bug
  (m) public Bug<A, B> Bug.foo()
  (m) public A Bug.key()
  (m) public Bug<A, B> Bug.next() (bridge)
  (m) public void Bug.next_$eq(Bug<A, B>) (bridge)
  (f) private final A Bug.key
  (f) private java.lang.Object Bug.next