// even with a nil *Checker
	res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
	if err != nil {
		t.Fatal(err)
	}

	// instantiated type should point to itself
	if p := res.Underlying().(*Pointer).Elem(); p != res {
		t.Fatalf("unexpected result type: %s points to %s", res, p)
	}
}

func TestInstantiateConcurrent(t *testing.T) {
	const src = `package p

type I[P any] interface {
	m(P)

	// even with a nil *Checker
	res, err := Instantiate(nil, T, []Type{Typ[Int]}, false)
	if err != nil {
		t.Fatal(err)
	}

	// instantiated type should point to itself
	if p := res.Underlying().(*Pointer).Elem(); p != res {
		t.Fatalf("unexpected result type: %s points to %s", res, p)
	}
}

func TestInstantiateConcurrent(t *testing.T) {
	const src = `package p

type I[P any] interface {
	m(P)

				transformer := transformerFromOverrides(transformers, schema.ParseGroupResource(resource))
				transformerName := string(
					reflect.ValueOf(transformer).Elem().FieldByName("transformers").Index(0).FieldByName("Prefix").Bytes(),
				)

				if transformerName != expectedTransformerName {

	if called != (1<<expectedCount)-1 {
		t.Fatalf("expected %d calls but saw calls %b", expectedCount, called)
	}
}

func TestCloneNonFuncFields(t *testing.T) {
	var c1 Config
	v := reflect.ValueOf(&c1).Elem()

	typ := v.Type()
	for i := 0; i < typ.NumField(); i++ {
		f := v.Field(i)
		// testing/quick can't handle functions or interfaces and so
		// isn't used here.
		switch fn := typ.Field(i).Name; fn {

		// these fields are chosen such that, if status is extracted as properties["status"], it's validation is not lost.
		if statusSubresourceEnabled {
			v := reflect.ValueOf(schema).Elem()
			for i := 0; i < v.NumField(); i++ {
				// skip zero values
				if value := v.Field(i).Interface(); reflect.DeepEqual(value, reflect.Zero(reflect.TypeOf(value)).Interface()) {
					continue
				}

		}
	}
}

// Test to catch new fields in FilterChainMatch message.
func TestFilterChainMatchFields(t *testing.T) {
	fcm := listener.FilterChainMatch{}
	e := reflect.ValueOf(&fcm).Elem()
	// If this fails, that means new fields have been added to FilterChainMatch, filterChainMatchEqual function needs to be updated.
	if e.NumField() != 14 {