message: flattests_cpp17 doesn't compile with Visual Studio 2017: warning C4100: 'indent': unreferenced formal parameter
  stringify_util.h(127): error C2220: warning treated as error - no 'object' file generated
  stringify_util.h(127): warning C4100: 'indent': unreferenced formal parameter
  stringify_util.h(85): warning C4100: 'indent': unreferenced formal parameter
  stringify_util.h(85): warning C4100: 'fbs': unreferenced formal parameter
diff: @@ -83,6 +83,8 @@ std::string StringifyTableOrStructImpl(const FBS &fbs,
  template<typename FBS>
  std::string StringifyTableOrStruct(const FBS &fbs, const std::string &indent) {
  + (void)fbs;
  + (void)indent;
  static constexpr size_t field_count = FBS::Traits::fields_number;
  std::string out;
  if constexpr (field_count > 0) {
  @@ -125,6 +127,7 @@ template<typename T> std::string StringifyArithmeticType(T val) {
  template<typename T>
  std::optional<std::string> StringifyFlatbufferValue(T &&val,
  const std::string &indent) {
  + (void)indent;
  constexpr bool is_pointer = std::is_pointer_v<std::remove_reference_t<T>>;
  if constexpr (is_pointer) {
  if (val == nullptr) return std::nullopt; // Field is absent.
  