scenarios := []struct {
			mode     string
			expected string
			musthave []string
		}{
			{
				mode:     "simple",
				expected: "bar foo",
			},
			{
				mode:     "goodexit",
				expected: "orange apple",
			},
			{
				mode:     "badexit",
				expected: "blub blix",
			},
			{
				mode: "panics",
				musthave: []string{
					"fatal error: exit hook invoked panic",
					"main.testPanics",

type Constraint uint8

const (
	MustNotHave Constraint = iota
	MayHave
	MustHave
)

// UserGoReqs is a common requirement among events that are running
// or are close to running user code.

		return curCtx, false, fmt.Errorf("%s event for proc that's not %s or %s", go122.EventString(ev.typ), go122.ProcRunning, go122.ProcSyscall)
	}
	reqs := event.SchedReqs{Thread: event.MustHave, Proc: event.MustHave, Goroutine: event.MayHave}
	if err := validateCtx(curCtx, reqs); err != nil {
		return curCtx, false, err
	}
	state.status = go122.ProcIdle
	newCtx := curCtx
	newCtx.P = NoProc