EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
  if (!status.ok()) GTEST_SKIP() << "RenameFile() not supported: " << status;

  status = env_->FileExists(filepath);
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::NOT_FOUND);
  status = env_->FileExists(new_filepath);
  EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
}

TEST_P(ModularFileSystemTest, TestRenameFileOverwrite) {

  return StatusFromTF_Status(plugin_status.get());
}

Status ModularFileSystem::FileExists(const std::string& fname,
                                     TransactionToken* token) {
  if (ops_->path_exists == nullptr)
    return errors::Unimplemented(tensorflow::strings::StrCat(
        "Filesystem for ", fname, " does not support FileExists()"));

  UniquePtrTo_TF_Status plugin_status(TF_NewStatus(), TF_DeleteStatus);

  Status NewReadOnlyMemoryRegionFromFile(
      const std::string& fname, TransactionToken* token,
      std::unique_ptr<ReadOnlyMemoryRegion>* result) override;
  Status FileExists(const std::string& fname, TransactionToken* token) override;
  bool FilesExist(const std::vector<std::string>& files,
                  TransactionToken* token,
                  std::vector<Status>* status) override;

*   `BusAdjacency` enum replaced with a protocol buffer `DeviceLocality`. PCI
    bus indexing now starts from 1 instead of 0, and `bus_id==0` is used where
    previously `BUS_ANY` was used.
*   `Env::FileExists` and `FileSystem::FileExists` now return a
    tensorflow::Status instead of a bool. Any callers to this function can be
    converted to a bool by adding .ok() to the call.