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diff --git a/third_party/abseil-cpp/absl/types/bad_variant_access.h b/third_party/abseil-cpp/absl/types/bad_variant_access.h
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+// Copyright 2018 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.
+//
+// -----------------------------------------------------------------------------
+// bad_variant_access.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::bad_variant_access` type.
+
+#ifndef ABSL_TYPES_BAD_VARIANT_ACCESS_H_
+#define ABSL_TYPES_BAD_VARIANT_ACCESS_H_
+
+#include <stdexcept>
+
+#include "absl/base/config.h"
+
+#ifdef ABSL_USES_STD_VARIANT
+
+#include <variant>
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+using std::bad_variant_access;
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#else  // ABSL_USES_STD_VARIANT
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// -----------------------------------------------------------------------------
+// bad_variant_access
+// -----------------------------------------------------------------------------
+//
+// An `absl::bad_variant_access` type is an exception type that is thrown in
+// the following cases:
+//
+//   * Calling `absl::get(absl::variant) with an index or type that does not
+//     match the currently selected alternative type
+//   * Calling `absl::visit on an `absl::variant` that is in the
+//     `variant::valueless_by_exception` state.
+//
+// Example:
+//
+//   absl::variant<int, std::string> v;
+//   v = 1;
+//   try {
+//     absl::get<std::string>(v);
+//   } catch(const absl::bad_variant_access& e) {
+//     std::cout << "Bad variant access: " << e.what() << '\n';
+//   }
+class bad_variant_access : public std::exception {
+ public:
+  bad_variant_access() noexcept = default;
+  ~bad_variant_access() override;
+  const char* what() const noexcept override;
+};
+
+namespace variant_internal {
+
+[[noreturn]] void ThrowBadVariantAccess();
+[[noreturn]] void Rethrow();
+
+}  // namespace variant_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_USES_STD_VARIANT
+
+#endif  // ABSL_TYPES_BAD_VARIANT_ACCESS_H_