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diff --git a/Firestore/third_party/abseil-cpp/absl/base/internal/identity.h b/Firestore/third_party/abseil-cpp/absl/base/internal/identity.h
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index 0000000..a6734b4
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+++ b/Firestore/third_party/abseil-cpp/absl/base/internal/identity.h
@@ -0,0 +1,33 @@
+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef ABSL_BASE_INTERNAL_IDENTITY_H_
+#define ABSL_BASE_INTERNAL_IDENTITY_H_
+
+namespace absl {
+namespace internal {
+
+template <typename T>
+struct identity {
+  typedef T type;
+};
+
+template <typename T>
+using identity_t = typename identity<T>::type;
+
+}  //  namespace internal
+}  //  namespace absl
+
+#endif  // ABSL_BASE_INTERNAL_IDENTITY_H_