func LabelNewWithMnemonic(str string) (*Label, error) {
	cstr := C.CString(str)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_label_new_with_mnemonic((*C.gchar)(cstr))
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapLabel(obj), nil
}
func LabelNewWithMnemonic(str string) (*Label, error) {
	cstr := C.CString(str)
	defer C.free(unsafe.Pointer(cstr))
	c := C.gtk_label_new_with_mnemonic((*C.gchar)(cstr))
	if c == nil {
		return nil, nilPtrErr
	}
	obj := glib.Take(unsafe.Pointer(c))
	return wrapLabel(obj), nil
}
// LabelNewWithMnemonic is a wrapper around gtk_label_new_with_mnemonic().