for range b.N {
		for range 16 {
			s.Add(nil)
		}
		for range 8 {
			if _, ok := s.TakeRandom(); !ok {
				b.Fatal("want ok")
			}
		}
		for range 8 {
			s.Add(nil)
		}
		for range 16 {
			if _, ok := s.TakeRandom(); !ok {
				b.Fatal("want ok")
			}
		}
		if _, ok := s.TakeRandom(); ok {
			b.Fatal("unexpected ok")
		}
	}

	s.s[len(s.s)-1] = connRequestAndIndex{}
	s.s = s.s[:len(s.s)-1]
}

// TakeRandom returns and removes a random element from s
// and reports whether there was one to take. (It returns ok=false
// if the set is empty.)
func (s *connRequestSet) TakeRandom() (v chan connRequest, ok bool) {
	if len(s.s) == 0 {
		return nil, false
	}
	pick := rand.IntN(len(s.s))