message: Unused variables in CRUD test
diff: @@ -453,7 +453,7 @@ document::value run_replace_one_test(collection* coll, document::view operation)
  // Server versions below 2.4 do not return an `nModified` count.
  try {
  modified_count = update_result->modified_count();
  - } catch (const std::exception& e) {
  + } catch (const std::exception&) {
  }
  upserted_count = update_result->result().upserted_count();
  @@ -514,7 +514,7 @@ document::value run_update_many_test(collection* coll, document::view operation)
  // Server versions below 2.4 do not return an `nModified` count.
  try {
  modified_count = update_result->modified_count();
  - } catch (const std::exception& e) {
  + } catch (const std::exception&) {
  }
  upserted_count = update_result->result().upserted_count();
  @@ -575,7 +575,7 @@ document::value run_update_one_test(collection* coll, document::view operation)
  // Server versions below 2.4 do not return an `nModified` count.
  try {
  modified_count = update_result->modified_count();
  - } catch (const std::exception& e) {
  + } catch (const std::exception&) {
  }
  upserted_count = update_result->result().upserted_count();
  