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diff --git a/absl/base/internal/atomic_hook_test_helper.cc b/absl/base/internal/atomic_hook_test_helper.cc
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+// 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
+//
+//      https://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.
+
+#include "absl/base/internal/atomic_hook_test_helper.h"
+
+#include "absl/base/attributes.h"
+#include "absl/base/internal/atomic_hook.h"
+
+namespace absl {
+namespace atomic_hook_internal {
+
+ABSL_CONST_INIT absl::base_internal::AtomicHook<VoidF> func(DefaultFunc);
+ABSL_CONST_INIT int default_func_calls = 0;
+void DefaultFunc() { default_func_calls++; }
+void RegisterFunc(VoidF f) { func.Store(f); }
+
+}  // namespace atomic_hook_internal
+}  // namespace absl