// Exploit the timeout of "go test" as a timer for the subsequent verification.
	timeout := 5 * time.Minute
	if deadline, ok := t.Deadline(); ok {
		timeout = deadline.Sub(time.Now())
		timeout -= timeout / 10 // Leave 10% headroom for cleanup.
	}
	expiredTime := time.NewTimer(timeout)
	defer expiredTime.Stop()

	// Trigger garbage collection repeatedly, waiting for all pipes in sync.Pool
	// to either be deallocated and closed, or to time out.

// how long it takes to call through the scheduler.
// We could be more aggressive and bump this up to 128 ns while still getting
// useful data, but the extra bit doesn't save us that much and the headroom is
// nice to have.
//
// Hitting this target resolution is easy in the nanotime case: just pick a
// division of 64. In the cputicks case it's a bit more complex.
//