SetWriteDeadline(t time.Time) error
}

var listenerBacklogCache struct {
	sync.Once
	val int
}

// listenerBacklog is a caching wrapper around maxListenerBacklog.
//
// listenerBacklog should be an internal detail,
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/database64128/tfo-go/v2