{"-Ufoo=bar"},
	{"-F@dir"},
	{"-F-dir"},
	{"-I@dir"},
	{"-I-dir"},
	{"-O@1"},
	{"-Wa,-foo"},
	{"-W@foo"},
	{"-Wp,-DX,-D@X"},
	{"-Wp,-UX,-U@X"},
	{"-g@gdb"},
	{"-g-gdb"},
	{"-march=@dawn"},
	{"-march=-dawn"},
	{"-mcmodel=@model"},
	{"-mlarge-data-threshold=@12"},
	{"-std=@c99"},
	{"-std=-c99"},
	{"-x@c"},
	{"-x-c"},
	{"-D", "@foo"},
	{"-D", "-foo"},
	{"-I", "@foo"},
	{"-I", "-foo"},

	}
	return typ, nil
}

// Wrapper is a wrapper around the Envoy ConfigDump
// It has extra helper functions for handling any/struct/marshal protobuf pain
type Wrapper struct {
	*admin.ConfigDump
}

// UnmarshalJSON is a custom unmarshaller to handle protobuf pain
func (w *Wrapper) UnmarshalJSON(b []byte) error {
	cd := &admin.ConfigDump{}
	err := protomarshal.UnmarshalAllowUnknownWithAnyResolver(nonStrictResolver, b, cd)

    }

    private static List<Boolean> parametersNullabilityOf(CtBehavior behavior) {
        def annotations = behavior.parameterAnnotations as List<Object[]>
        annotations.collect { Object[] pAnn ->
            pAnn.flatten().any { isNullableCtAnnotation(it) }
        }
    }

    private static boolean hasNullableAnnotation(CtField field) {
        return NULLABLE_ANNOTATIONS.any { field.hasAnnotation(it) }
    }

}

func do(ctx context.Context, k int) {
	trace.Log(ctx, "log", "before do")

	var t *trace.Task
	ctx, t = trace.NewTask(ctx, "do")
	defer t.End()

	trace.Log(ctx, "log2", "do")

	// Create a region and spawn more tasks and more workers.
	trace.WithRegion(ctx, "fanout", func() {
		for i := 0; i < k; i++ {
			go func(i int) {
				trace.WithRegion(ctx, fmt.Sprintf("region%d", i), func() {

		// that it is the same GOROOT value baked into the binary, and we can't
		// change the value in-process because runtime.GOROOT uses the value from
		// initial (not current) environment. Spawn a subprocess to determine the
		// real baked-in GOROOT.
		t.Logf("found GOROOT %q from environment; checking embedded GOROOT value", envGoroot)
		testenv.MustHaveExec(t)
		exe, err := os.Executable()
		if err != nil {