message: unused variable warning
diff: @@ -201,7 +201,7 @@ TEST(File_NoSpuriousTryLockFailures2)
  std::atomic<size_t> barrier_2 { 0 };
  std::atomic<size_t> lock_not_taken { 0 };
  - auto slave = [&](int ndx, std::string path) {
  + auto slave = [&](std::string path) {
  File file(path, File::mode_Write);
  for(size_t t = 0; t < num_rounds; t++) {
  @@ -248,7 +248,7 @@ TEST(File_NoSpuriousTryLockFailures2)
  std::string str_path = path;
  ThreadWrapper slaves[100];
  for (size_t i = 0; i != num_slaves; ++i) {
  - slaves[i].start([=] { slave(i, str_path); });
  + slaves[i].start([=] { slave(str_path); });
  }
  for (size_t i = 0; i != num_slaves; ++i)
  