c := make(chan bool)
	for i := 0; i < b.N; i++ {
		go func() {
			var s stkobjT
			Sum(100000, &s)
			c <- true
		}()
		<-c
	}
}

func BenchmarkIssue18138(b *testing.B) {
	// Channel with N "can run a goroutine" tokens
	const N = 10
	c := make(chan []byte, N)
	for i := 0; i < N; i++ {
		c <- make([]byte, 1)
	}

	for i := 0; i < b.N; i++ {