time.Sleep(10 * time.Millisecond)

	// Force concurrent GC to shrink the stacks.
	runtime.GC()

	// Wake selects.
	close(d)
	<-ready1
	<-ready2
}

type struct0 struct{}

func BenchmarkMakeChan(b *testing.B) {
	b.Run("Byte", func(b *testing.B) {
		var x chan byte
		for i := 0; i < b.N; i++ {
			x = make(chan byte, 8)
		}
		close(x)
	})
	b.Run("Int", func(b *testing.B) {
		var x chan int