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diff --git a/third_party/abseil-cpp/absl/container/internal/unordered_set_constructor_test.h b/third_party/abseil-cpp/absl/container/internal/unordered_set_constructor_test.h
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index 0000000000..41165b05e9
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+++ b/third_party/abseil-cpp/absl/container/internal/unordered_set_constructor_test.h
@@ -0,0 +1,496 @@
+// 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.
+
+#ifndef ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_
+#define ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_
+
+#include <algorithm>
+#include <unordered_set>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/container/internal/hash_generator_testing.h"
+#include "absl/container/internal/hash_policy_testing.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+namespace container_internal {
+
+template <class UnordMap>
+class ConstructorTest : public ::testing::Test {};
+
+TYPED_TEST_SUITE_P(ConstructorTest);
+
+TYPED_TEST_P(ConstructorTest, NoArgs) {
+  TypeParam m;
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCount) {
+  TypeParam m(123);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHash) {
+  using H = typename TypeParam::hasher;
+  H hasher;
+  TypeParam m(123, hasher);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqual) {
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  H hasher;
+  E equal;
+  TypeParam m(123, hasher, equal);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.key_eq(), equal);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashEqualAlloc) {
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(123, hasher, equal, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.key_eq(), equal);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+
+  const auto& cm = m;
+  EXPECT_EQ(cm.hash_function(), hasher);
+  EXPECT_EQ(cm.key_eq(), equal);
+  EXPECT_EQ(cm.get_allocator(), alloc);
+  EXPECT_TRUE(cm.empty());
+  EXPECT_THAT(keys(cm), ::testing::UnorderedElementsAre());
+  EXPECT_GE(cm.bucket_count(), 123);
+}
+
+template <typename T>
+struct is_std_unordered_set : std::false_type {};
+
+template <typename... T>
+struct is_std_unordered_set<std::unordered_set<T...>> : std::true_type {};
+
+#if defined(UNORDERED_SET_CXX14) || defined(UNORDERED_SET_CXX17)
+using has_cxx14_std_apis = std::true_type;
+#else
+using has_cxx14_std_apis = std::false_type;
+#endif
+
+template <typename T>
+using expect_cxx14_apis =
+    absl::disjunction<absl::negation<is_std_unordered_set<T>>,
+                      has_cxx14_std_apis>;
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountAllocTest(std::true_type) {
+  using A = typename TypeParam::allocator_type;
+  A alloc(0);
+  TypeParam m(123, alloc);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountAlloc) {
+  BucketCountAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void BucketCountHashAllocTest(std::true_type) {
+  using H = typename TypeParam::hasher;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  A alloc(0);
+  TypeParam m(123, hasher, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, BucketCountHashAlloc) {
+  BucketCountHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+#if ABSL_UNORDERED_SUPPORTS_ALLOC_CTORS
+using has_alloc_std_constructors = std::true_type;
+#else
+using has_alloc_std_constructors = std::false_type;
+#endif
+
+template <typename T>
+using expect_alloc_constructors =
+    absl::disjunction<absl::negation<is_std_unordered_set<T>>,
+                      has_alloc_std_constructors>;
+
+template <typename TypeParam>
+void AllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void AllocTest(std::true_type) {
+  using A = typename TypeParam::allocator_type;
+  A alloc(0);
+  TypeParam m(alloc);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_TRUE(m.empty());
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAre());
+}
+
+TYPED_TEST_P(ConstructorTest, Alloc) {
+  AllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashEqualAlloc) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  std::vector<T> values;
+  for (size_t i = 0; i != 10; ++i)
+    values.push_back(hash_internal::Generator<T>()());
+  TypeParam m(values.begin(), values.end(), 123, hasher, equal, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.key_eq(), equal);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using A = typename TypeParam::allocator_type;
+  A alloc(0);
+  std::vector<T> values;
+  for (size_t i = 0; i != 10; ++i)
+    values.push_back(hash_internal::Generator<T>()());
+  TypeParam m(values.begin(), values.end(), 123, alloc);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketAlloc) {
+  InputIteratorBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InputIteratorBucketHashAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  A alloc(0);
+  std::vector<T> values;
+  for (size_t i = 0; i != 10; ++i)
+    values.push_back(hash_internal::Generator<T>()());
+  TypeParam m(values.begin(), values.end(), 123, hasher, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InputIteratorBucketHashAlloc) {
+  InputIteratorBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructor) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(123, hasher, equal, alloc);
+  for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+  TypeParam n(m);
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_EQ(m.get_allocator(), n.get_allocator());
+  EXPECT_EQ(m, n);
+  EXPECT_NE(TypeParam(0, hasher, equal, alloc), n);
+}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void CopyConstructorAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(123, hasher, equal, alloc);
+  for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+  TypeParam n(m, A(11));
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_NE(m.get_allocator(), n.get_allocator());
+  EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, CopyConstructorAlloc) {
+  CopyConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on copy constructors.
+
+TYPED_TEST_P(ConstructorTest, MoveConstructor) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(123, hasher, equal, alloc);
+  for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+  TypeParam t(m);
+  TypeParam n(std::move(t));
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_EQ(m.get_allocator(), n.get_allocator());
+  EXPECT_EQ(m, n);
+}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void MoveConstructorAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(123, hasher, equal, alloc);
+  for (size_t i = 0; i != 10; ++i) m.insert(hash_internal::Generator<T>()());
+  TypeParam t(m);
+  TypeParam n(std::move(t), A(1));
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_NE(m.get_allocator(), n.get_allocator());
+  EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveConstructorAlloc) {
+  MoveConstructorAllocTest<TypeParam>(expect_alloc_constructors<TypeParam>());
+}
+
+// TODO(alkis): Test non-propagating allocators on move constructors.
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashEqualAlloc) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  TypeParam m(values, 123, hasher, equal, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.key_eq(), equal);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using A = typename TypeParam::allocator_type;
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  A alloc(0);
+  TypeParam m(values, 123, alloc);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketAlloc) {
+  InitializerListBucketAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::false_type) {}
+
+template <typename TypeParam>
+void InitializerListBucketHashAllocTest(std::true_type) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  A alloc(0);
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  TypeParam m(values, 123, hasher, alloc);
+  EXPECT_EQ(m.hash_function(), hasher);
+  EXPECT_EQ(m.get_allocator(), alloc);
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+  EXPECT_GE(m.bucket_count(), 123);
+}
+
+TYPED_TEST_P(ConstructorTest, InitializerListBucketHashAlloc) {
+  InitializerListBucketHashAllocTest<TypeParam>(expect_cxx14_apis<TypeParam>());
+}
+
+TYPED_TEST_P(ConstructorTest, CopyAssignment) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  hash_internal::Generator<T> gen;
+  TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+  TypeParam n;
+  n = m;
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_EQ(m, n);
+}
+
+// TODO(alkis): Test [non-]propagating allocators on move/copy assignments
+// (it depends on traits).
+
+TYPED_TEST_P(ConstructorTest, MoveAssignment) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  using H = typename TypeParam::hasher;
+  using E = typename TypeParam::key_equal;
+  using A = typename TypeParam::allocator_type;
+  H hasher;
+  E equal;
+  A alloc(0);
+  hash_internal::Generator<T> gen;
+  TypeParam m({gen(), gen(), gen()}, 123, hasher, equal, alloc);
+  TypeParam t(m);
+  TypeParam n;
+  n = std::move(t);
+  EXPECT_EQ(m.hash_function(), n.hash_function());
+  EXPECT_EQ(m.key_eq(), n.key_eq());
+  EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerList) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  TypeParam m;
+  m = values;
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOverwritesExisting) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  TypeParam m({gen(), gen(), gen()});
+  TypeParam n({gen()});
+  n = m;
+  EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, MoveAssignmentOverwritesExisting) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  TypeParam m({gen(), gen(), gen()});
+  TypeParam t(m);
+  TypeParam n({gen()});
+  n = std::move(t);
+  EXPECT_EQ(m, n);
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentFromInitializerListOverwritesExisting) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  TypeParam m;
+  m = values;
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+TYPED_TEST_P(ConstructorTest, AssignmentOnSelf) {
+  using T = hash_internal::GeneratedType<TypeParam>;
+  hash_internal::Generator<T> gen;
+  std::initializer_list<T> values = {gen(), gen(), gen(), gen(), gen()};
+  TypeParam m(values);
+  m = *&m;  // Avoid -Wself-assign.
+  EXPECT_THAT(keys(m), ::testing::UnorderedElementsAreArray(values));
+}
+
+REGISTER_TYPED_TEST_CASE_P(
+    ConstructorTest, NoArgs, BucketCount, BucketCountHash, BucketCountHashEqual,
+    BucketCountHashEqualAlloc, BucketCountAlloc, BucketCountHashAlloc, Alloc,
+    InputIteratorBucketHashEqualAlloc, InputIteratorBucketAlloc,
+    InputIteratorBucketHashAlloc, CopyConstructor, CopyConstructorAlloc,
+    MoveConstructor, MoveConstructorAlloc, InitializerListBucketHashEqualAlloc,
+    InitializerListBucketAlloc, InitializerListBucketHashAlloc, CopyAssignment,
+    MoveAssignment, AssignmentFromInitializerList, AssignmentOverwritesExisting,
+    MoveAssignmentOverwritesExisting,
+    AssignmentFromInitializerListOverwritesExisting, AssignmentOnSelf);
+
+}  // namespace container_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_CONTAINER_INTERNAL_UNORDERED_SET_CONSTRUCTOR_TEST_H_