func goexitSeq() Seq[int] {
	return func(yield func(int) bool) {
		runtime.Goexit()
	}
}

func goexitCleanupSeq() Seq[int] {
	return func(yield func(int) bool) {
		for {
			if !yield(55) {
				runtime.Goexit()
			}
		}
	}
}

func TestPull2Goexit(t *testing.T) {
	t.Run("next", func(t *testing.T) {
		var next func() (int, int, bool)
		var stop func()
		if !goexits(t, func() {

			// Propagate panics and goexits from seq.
			if panicValue != nil {
				if panicValue == goexitPanicValue {
					// Propagate runtime.Goexit from seq.
					runtime.Goexit()
				} else {
					panic(panicValue)
				}
			}
		}
	}
	return next, stop
}

// goexitPanicValue is a sentinel value indicating that an iterator
// exited via runtime.Goexit.

	if ns == 0 {
		return scratch
	}
	return ns
}

var goexits = []byte("go: exit ")
var emptystatus = []byte("\x00")
var exiting uint32

func goexitsall(status *byte) {
	var buf [_ERRMAX]byte
	if !atomic.Cas(&exiting, 0, 1) {
		return
	}
	getg().m.locks++
	n := copy(buf[:], goexits)
	n = copy(buf[n:], gostringnocopy(status))
	pid := getpid()

// If all other goroutines exit, the program crashes.
func Goexit() {
	// Create a panic object for Goexit, so we can recognize when it might be
	// bypassed by a recover().
	var p _panic
	p.goexit = true

	p.start(getcallerpc(), unsafe.Pointer(getcallersp()))
	for {
		fn, ok := p.nextDefer()
		if !ok {
			break
		}
		fn()
	}

	goexit1()
}

type neverCallThisFunction struct{}

// goexit is the return stub at the top of every goroutine call stack.
// Each goroutine stack is constructed as if goexit called the
// goroutine's entry point function, so that when the entry point
// function returns, it will return to goexit, which will call goexit1
// to perform the actual exit.
//
// This function must never be called directly. Call goexit1 instead.

	// immediately) to unexpectedly block on reading from the pipe.
	var (
		nHangs       = runtime.GOMAXPROCS(0)
		nExits       = runtime.GOMAXPROCS(0)
		hangs, exits sync.WaitGroup
	)
	hangs.Add(nHangs)
	exits.Add(nExits)

	// ready is done when the goroutines have done as much work as possible to
	// prepare to create subprocesses. It isn't strictly necessary for the test,

	18: {exits: [10]int{down: 16, east: 19, west: 18, up: 22}},
	19: {exits: [10]int{up: 29, west: 18, ne: 15, east: 20, south: 30}},
	20: {exits: [10]int{ne: 19, west: 20, se: 21}},
	21: {exits: [10]int{north: 20}}, // Dead End
	22: {exits: [10]int{north: 18, east: 24, down: 23, south: 28, west: 26, nw: 22}},
	23: {exits: [10]int{east: 22, west: 28, up: 24}},
	24: {exits: [10]int{ne: 25, down: 23, nw: 28, sw: 26}},

	want := "no goroutines (main called runtime.Goexit) - deadlock!"
	if !strings.Contains(output, want) {
		t.Fatalf("output:\n%s\n\nwant output containing: %s", output, want)
	}
}

func TestGoexitDefer(t *testing.T) {
	c := make(chan struct{})
	go func() {
		defer func() {
			r := recover()
			if r != nil {
				t.Errorf("non-nil recover during Goexit")
			}
			c <- struct{}{}
		}()

// called.
func fRunner(f *F, fn func(*F)) {
	// When this goroutine is done, either because runtime.Goexit was called, a
	// panic started, or fn returned normally, record the duration and send
	// t.signal, indicating the fuzz test is done.
	defer func() {
		// Detect whether the fuzz test panicked or called runtime.Goexit
		// without calling F.Fuzz, F.Fail, or F.Skip. If it did, panic (possibly

// If the test is chatty/verbose, it'll print a success message to stdout.
// If recovered is non-nil, it'll panic with that value.
// If the test panicked with nil, or invoked runtime.Goexit, it'll be
// made to fail and panic with errNilPanicOrGoexit
func (eg *InternalExample) processRunResult(stdout string, timeSpent time.Duration, finished bool, recovered any) (passed bool) {
	passed = true