Down-integrate from internal branch

1 files changed, 250 insertions, 57 deletions

diff --git a/src/google/protobuf/test_util.cc b/src/google/protobuf/test_util.cc
index af8b3909..841f4b30 100644
--- a/src/google/protobuf/test_util.cc
+++ b/src/google/protobuf/test_util.cc
@@ -50,6 +50,13 @@ namespace google {
 namespace protobuf {
 
 void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
+  SetOptionalFields(message);
+  AddRepeatedFields1(message);
+  AddRepeatedFields2(message);
+  SetDefaultFields(message);
+}
+
+void TestUtil::SetOptionalFields(unittest::TestAllTypes* message) {
   message->set_optional_int32   (101);
   message->set_optional_int64   (102);
   message->set_optional_uint32  (103);
@@ -66,10 +73,12 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
   message->set_optional_string  ("115");
   message->set_optional_bytes   ("116");
 
-  message->mutable_optionalgroup           ()->set_a(117);
-  message->mutable_optional_nested_message ()->set_bb(118);
-  message->mutable_optional_foreign_message()->set_c(119);
-  message->mutable_optional_import_message ()->set_d(120);
+  message->mutable_optionalgroup                 ()->set_a(117);
+  message->mutable_optional_nested_message       ()->set_bb(118);
+  message->mutable_optional_foreign_message      ()->set_c(119);
+  message->mutable_optional_import_message       ()->set_d(120);
+  message->mutable_optional_public_import_message()->set_e(126);
+  message->mutable_optional_lazy_message         ()->set_bb(127);
 
   message->set_optional_nested_enum (unittest::TestAllTypes::BAZ);
   message->set_optional_foreign_enum(unittest::FOREIGN_BAZ      );
@@ -87,9 +96,11 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
     message->GetDescriptor()->FindFieldByName("optional_cord"),
     "125");
 #endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
 
-  // -----------------------------------------------------------------
+// -------------------------------------------------------------------
 
+void TestUtil::AddRepeatedFields1(unittest::TestAllTypes* message) {
   message->add_repeated_int32   (201);
   message->add_repeated_int64   (202);
   message->add_repeated_uint32  (203);
@@ -110,6 +121,7 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
   message->add_repeated_nested_message ()->set_bb(218);
   message->add_repeated_foreign_message()->set_c(219);
   message->add_repeated_import_message ()->set_d(220);
+  message->add_repeated_lazy_message   ()->set_bb(227);
 
   message->add_repeated_nested_enum (unittest::TestAllTypes::BAR);
   message->add_repeated_foreign_enum(unittest::FOREIGN_BAR      );
@@ -125,7 +137,9 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
     message->GetDescriptor()->FindFieldByName("repeated_cord"),
     "225");
 #endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
 
+void TestUtil::AddRepeatedFields2(unittest::TestAllTypes* message) {
   // Add a second one of each field.
   message->add_repeated_int32   (301);
   message->add_repeated_int64   (302);
@@ -147,6 +161,7 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
   message->add_repeated_nested_message ()->set_bb(318);
   message->add_repeated_foreign_message()->set_c(319);
   message->add_repeated_import_message ()->set_d(320);
+  message->add_repeated_lazy_message   ()->set_bb(327);
 
   message->add_repeated_nested_enum (unittest::TestAllTypes::BAZ);
   message->add_repeated_foreign_enum(unittest::FOREIGN_BAZ      );
@@ -162,9 +177,11 @@ void TestUtil::SetAllFields(unittest::TestAllTypes* message) {
     message->GetDescriptor()->FindFieldByName("repeated_cord"),
     "325");
 #endif  // !PROTOBUF_TEST_NO_DESCRIPTORS
+}
 
-  // -----------------------------------------------------------------
+// -------------------------------------------------------------------
 
+void TestUtil::SetDefaultFields(unittest::TestAllTypes* message) {
   message->set_default_int32   (401);
   message->set_default_int64   (402);
   message->set_default_uint32  (403);
@@ -220,6 +237,7 @@ void TestUtil::ModifyRepeatedFields(unittest::TestAllTypes* message) {
   message->mutable_repeated_nested_message (1)->set_bb(518);
   message->mutable_repeated_foreign_message(1)->set_c(519);
   message->mutable_repeated_import_message (1)->set_d(520);
+  message->mutable_repeated_lazy_message   (1)->set_bb(527);
 
   message->set_repeated_nested_enum (1, unittest::TestAllTypes::FOO);
   message->set_repeated_foreign_enum(1, unittest::FOREIGN_FOO      );
@@ -256,15 +274,19 @@ void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
   EXPECT_TRUE(message.has_optional_string  ());
   EXPECT_TRUE(message.has_optional_bytes   ());
 
-  EXPECT_TRUE(message.has_optionalgroup           ());
-  EXPECT_TRUE(message.has_optional_nested_message ());
-  EXPECT_TRUE(message.has_optional_foreign_message());
-  EXPECT_TRUE(message.has_optional_import_message ());
+  EXPECT_TRUE(message.has_optionalgroup                 ());
+  EXPECT_TRUE(message.has_optional_nested_message       ());
+  EXPECT_TRUE(message.has_optional_foreign_message      ());
+  EXPECT_TRUE(message.has_optional_import_message       ());
+  EXPECT_TRUE(message.has_optional_public_import_message());
+  EXPECT_TRUE(message.has_optional_lazy_message         ());
 
-  EXPECT_TRUE(message.optionalgroup           ().has_a());
-  EXPECT_TRUE(message.optional_nested_message ().has_bb());
-  EXPECT_TRUE(message.optional_foreign_message().has_c());
-  EXPECT_TRUE(message.optional_import_message ().has_d());
+  EXPECT_TRUE(message.optionalgroup                 ().has_a());
+  EXPECT_TRUE(message.optional_nested_message       ().has_bb());
+  EXPECT_TRUE(message.optional_foreign_message      ().has_c());
+  EXPECT_TRUE(message.optional_import_message       ().has_d());
+  EXPECT_TRUE(message.optional_public_import_message().has_e());
+  EXPECT_TRUE(message.optional_lazy_message         ().has_bb());
 
   EXPECT_TRUE(message.has_optional_nested_enum ());
   EXPECT_TRUE(message.has_optional_foreign_enum());
@@ -291,10 +313,12 @@ void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
   EXPECT_EQ("115", message.optional_string  ());
   EXPECT_EQ("116", message.optional_bytes   ());
 
-  EXPECT_EQ(117, message.optionalgroup           ().a());
-  EXPECT_EQ(118, message.optional_nested_message ().bb());
-  EXPECT_EQ(119, message.optional_foreign_message().c());
-  EXPECT_EQ(120, message.optional_import_message ().d());
+  EXPECT_EQ(117, message.optionalgroup                  ().a());
+  EXPECT_EQ(118, message.optional_nested_message        ().bb());
+  EXPECT_EQ(119, message.optional_foreign_message       ().c());
+  EXPECT_EQ(120, message.optional_import_message        ().d());
+  EXPECT_EQ(126, message.optional_public_import_message ().e());
+  EXPECT_EQ(127, message.optional_lazy_message          ().bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAZ, message.optional_nested_enum ());
   EXPECT_EQ(unittest::FOREIGN_BAZ      , message.optional_foreign_enum());
@@ -323,6 +347,7 @@ void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
   ASSERT_EQ(2, message.repeated_nested_message_size ());
   ASSERT_EQ(2, message.repeated_foreign_message_size());
   ASSERT_EQ(2, message.repeated_import_message_size ());
+  ASSERT_EQ(2, message.repeated_lazy_message_size   ());
   ASSERT_EQ(2, message.repeated_nested_enum_size    ());
   ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
   ASSERT_EQ(2, message.repeated_import_enum_size    ());
@@ -352,6 +377,7 @@ void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
   EXPECT_EQ(218, message.repeated_nested_message (0).bb());
   EXPECT_EQ(219, message.repeated_foreign_message(0).c());
   EXPECT_EQ(220, message.repeated_import_message (0).d());
+  EXPECT_EQ(227, message.repeated_lazy_message   (0).bb());
 
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
@@ -378,6 +404,7 @@ void TestUtil::ExpectAllFieldsSet(const unittest::TestAllTypes& message) {
   EXPECT_EQ(318, message.repeated_nested_message (1).bb());
   EXPECT_EQ(319, message.repeated_foreign_message(1).c());
   EXPECT_EQ(320, message.repeated_import_message (1).d());
+  EXPECT_EQ(327, message.repeated_lazy_message   (1).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAZ, message.repeated_nested_enum (1));
   EXPECT_EQ(unittest::FOREIGN_BAZ      , message.repeated_foreign_enum(1));
@@ -449,10 +476,12 @@ void TestUtil::ExpectClear(const unittest::TestAllTypes& message) {
   EXPECT_FALSE(message.has_optional_string  ());
   EXPECT_FALSE(message.has_optional_bytes   ());
 
-  EXPECT_FALSE(message.has_optionalgroup           ());
-  EXPECT_FALSE(message.has_optional_nested_message ());
-  EXPECT_FALSE(message.has_optional_foreign_message());
-  EXPECT_FALSE(message.has_optional_import_message ());
+  EXPECT_FALSE(message.has_optionalgroup                 ());
+  EXPECT_FALSE(message.has_optional_nested_message       ());
+  EXPECT_FALSE(message.has_optional_foreign_message      ());
+  EXPECT_FALSE(message.has_optional_import_message       ());
+  EXPECT_FALSE(message.has_optional_public_import_message());
+  EXPECT_FALSE(message.has_optional_lazy_message         ());
 
   EXPECT_FALSE(message.has_optional_nested_enum ());
   EXPECT_FALSE(message.has_optional_foreign_enum());
@@ -479,15 +508,19 @@ void TestUtil::ExpectClear(const unittest::TestAllTypes& message) {
   EXPECT_EQ(""   , message.optional_bytes   ());
 
   // Embedded messages should also be clear.
-  EXPECT_FALSE(message.optionalgroup           ().has_a());
-  EXPECT_FALSE(message.optional_nested_message ().has_bb());
-  EXPECT_FALSE(message.optional_foreign_message().has_c());
-  EXPECT_FALSE(message.optional_import_message ().has_d());
-
-  EXPECT_EQ(0, message.optionalgroup           ().a());
-  EXPECT_EQ(0, message.optional_nested_message ().bb());
-  EXPECT_EQ(0, message.optional_foreign_message().c());
-  EXPECT_EQ(0, message.optional_import_message ().d());
+  EXPECT_FALSE(message.optionalgroup                 ().has_a());
+  EXPECT_FALSE(message.optional_nested_message       ().has_bb());
+  EXPECT_FALSE(message.optional_foreign_message      ().has_c());
+  EXPECT_FALSE(message.optional_import_message       ().has_d());
+  EXPECT_FALSE(message.optional_public_import_message().has_e());
+  EXPECT_FALSE(message.optional_lazy_message         ().has_bb());
+
+  EXPECT_EQ(0, message.optionalgroup                 ().a());
+  EXPECT_EQ(0, message.optional_nested_message       ().bb());
+  EXPECT_EQ(0, message.optional_foreign_message      ().c());
+  EXPECT_EQ(0, message.optional_import_message       ().d());
+  EXPECT_EQ(0, message.optional_public_import_message().e());
+  EXPECT_EQ(0, message.optional_lazy_message         ().bb());
 
   // Enums without defaults are set to the first value in the enum.
   EXPECT_EQ(unittest::TestAllTypes::FOO, message.optional_nested_enum ());
@@ -516,6 +549,7 @@ void TestUtil::ExpectClear(const unittest::TestAllTypes& message) {
   EXPECT_EQ(0, message.repeated_nested_message_size ());
   EXPECT_EQ(0, message.repeated_foreign_message_size());
   EXPECT_EQ(0, message.repeated_import_message_size ());
+  EXPECT_EQ(0, message.repeated_lazy_message_size   ());
   EXPECT_EQ(0, message.repeated_nested_enum_size    ());
   EXPECT_EQ(0, message.repeated_foreign_enum_size   ());
   EXPECT_EQ(0, message.repeated_import_enum_size    ());
@@ -595,6 +629,7 @@ void TestUtil::ExpectRepeatedFieldsModified(
   ASSERT_EQ(2, message.repeated_nested_message_size ());
   ASSERT_EQ(2, message.repeated_foreign_message_size());
   ASSERT_EQ(2, message.repeated_import_message_size ());
+  ASSERT_EQ(2, message.repeated_lazy_message_size   ());
   ASSERT_EQ(2, message.repeated_nested_enum_size    ());
   ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
   ASSERT_EQ(2, message.repeated_import_enum_size    ());
@@ -624,6 +659,7 @@ void TestUtil::ExpectRepeatedFieldsModified(
   EXPECT_EQ(218, message.repeated_nested_message (0).bb());
   EXPECT_EQ(219, message.repeated_foreign_message(0).c());
   EXPECT_EQ(220, message.repeated_import_message (0).d());
+  EXPECT_EQ(227, message.repeated_lazy_message   (0).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(0));
@@ -651,6 +687,7 @@ void TestUtil::ExpectRepeatedFieldsModified(
   EXPECT_EQ(518, message.repeated_nested_message (1).bb());
   EXPECT_EQ(519, message.repeated_foreign_message(1).c());
   EXPECT_EQ(520, message.repeated_import_message (1).d());
+  EXPECT_EQ(527, message.repeated_lazy_message   (1).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::FOO, message.repeated_nested_enum (1));
   EXPECT_EQ(unittest::FOREIGN_FOO      , message.repeated_foreign_enum(1));
@@ -953,6 +990,9 @@ void TestUtil::SetAllExtensions(unittest::TestAllExtensions* message) {
   message->SetExtension(unittest::optional_string_piece_extension, "124");
   message->SetExtension(unittest::optional_cord_extension, "125");
 
+  message->MutableExtension(unittest::optional_public_import_message_extension)->set_e(126);
+  message->MutableExtension(unittest::optional_lazy_message_extension)->set_bb(127);
+
   // -----------------------------------------------------------------
 
   message->AddExtension(unittest::repeated_int32_extension   , 201);
@@ -975,6 +1015,7 @@ void TestUtil::SetAllExtensions(unittest::TestAllExtensions* message) {
   message->AddExtension(unittest::repeated_nested_message_extension )->set_bb(218);
   message->AddExtension(unittest::repeated_foreign_message_extension)->set_c(219);
   message->AddExtension(unittest::repeated_import_message_extension )->set_d(220);
+  message->AddExtension(unittest::repeated_lazy_message_extension   )->set_bb(227);
 
   message->AddExtension(unittest::repeated_nested_enum_extension , unittest::TestAllTypes::BAR);
   message->AddExtension(unittest::repeated_foreign_enum_extension, unittest::FOREIGN_BAR      );
@@ -1004,6 +1045,7 @@ void TestUtil::SetAllExtensions(unittest::TestAllExtensions* message) {
   message->AddExtension(unittest::repeated_nested_message_extension )->set_bb(318);
   message->AddExtension(unittest::repeated_foreign_message_extension)->set_c(319);
   message->AddExtension(unittest::repeated_import_message_extension )->set_d(320);
+  message->AddExtension(unittest::repeated_lazy_message_extension   )->set_bb(327);
 
   message->AddExtension(unittest::repeated_nested_enum_extension , unittest::TestAllTypes::BAZ);
   message->AddExtension(unittest::repeated_foreign_enum_extension, unittest::FOREIGN_BAZ      );
@@ -1073,6 +1115,7 @@ void TestUtil::ModifyRepeatedExtensions(unittest::TestAllExtensions* message) {
   message->MutableExtension(unittest::repeated_nested_message_extension , 1)->set_bb(518);
   message->MutableExtension(unittest::repeated_foreign_message_extension, 1)->set_c(519);
   message->MutableExtension(unittest::repeated_import_message_extension , 1)->set_d(520);
+  message->MutableExtension(unittest::repeated_lazy_message_extension   , 1)->set_bb(527);
 
   message->SetExtension(unittest::repeated_nested_enum_extension , 1, unittest::TestAllTypes::FOO);
   message->SetExtension(unittest::repeated_foreign_enum_extension, 1, unittest::FOREIGN_FOO      );
@@ -1102,15 +1145,19 @@ void TestUtil::ExpectAllExtensionsSet(
   EXPECT_TRUE(message.HasExtension(unittest::optional_string_extension  ));
   EXPECT_TRUE(message.HasExtension(unittest::optional_bytes_extension   ));
 
-  EXPECT_TRUE(message.HasExtension(unittest::optionalgroup_extension           ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_nested_message_extension ));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_foreign_message_extension));
-  EXPECT_TRUE(message.HasExtension(unittest::optional_import_message_extension ));
+  EXPECT_TRUE(message.HasExtension(unittest::optionalgroup_extension                 ));
+  EXPECT_TRUE(message.HasExtension(unittest::optional_nested_message_extension       ));
+  EXPECT_TRUE(message.HasExtension(unittest::optional_foreign_message_extension      ));
+  EXPECT_TRUE(message.HasExtension(unittest::optional_import_message_extension       ));
+  EXPECT_TRUE(message.HasExtension(unittest::optional_public_import_message_extension));
+  EXPECT_TRUE(message.HasExtension(unittest::optional_lazy_message_extension         ));
 
-  EXPECT_TRUE(message.GetExtension(unittest::optionalgroup_extension           ).has_a());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_nested_message_extension ).has_bb());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_foreign_message_extension).has_c());
-  EXPECT_TRUE(message.GetExtension(unittest::optional_import_message_extension ).has_d());
+  EXPECT_TRUE(message.GetExtension(unittest::optionalgroup_extension                 ).has_a());
+  EXPECT_TRUE(message.GetExtension(unittest::optional_nested_message_extension       ).has_bb());
+  EXPECT_TRUE(message.GetExtension(unittest::optional_foreign_message_extension      ).has_c());
+  EXPECT_TRUE(message.GetExtension(unittest::optional_import_message_extension       ).has_d());
+  EXPECT_TRUE(message.GetExtension(unittest::optional_public_import_message_extension).has_e());
+  EXPECT_TRUE(message.GetExtension(unittest::optional_lazy_message_extension         ).has_bb());
 
   EXPECT_TRUE(message.HasExtension(unittest::optional_nested_enum_extension ));
   EXPECT_TRUE(message.HasExtension(unittest::optional_foreign_enum_extension));
@@ -1146,6 +1193,8 @@ void TestUtil::ExpectAllExtensionsSet(
 
   EXPECT_EQ("124", message.GetExtension(unittest::optional_string_piece_extension));
   EXPECT_EQ("125", message.GetExtension(unittest::optional_cord_extension));
+  EXPECT_EQ(126, message.GetExtension(unittest::optional_public_import_message_extension ).e());
+  EXPECT_EQ(127, message.GetExtension(unittest::optional_lazy_message_extension).bb());
 
   // -----------------------------------------------------------------
 
@@ -1169,6 +1218,7 @@ void TestUtil::ExpectAllExtensionsSet(
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
@@ -1196,6 +1246,7 @@ void TestUtil::ExpectAllExtensionsSet(
   EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
   EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
   EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
+  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
@@ -1224,6 +1275,7 @@ void TestUtil::ExpectAllExtensionsSet(
   EXPECT_EQ(318, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
   EXPECT_EQ(319, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
   EXPECT_EQ(320, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
+  EXPECT_EQ(327, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAZ, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
   EXPECT_EQ(unittest::FOREIGN_BAZ      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
@@ -1307,10 +1359,12 @@ void TestUtil::ExpectExtensionsClear(
   EXPECT_FALSE(message.HasExtension(unittest::optional_string_extension  ));
   EXPECT_FALSE(message.HasExtension(unittest::optional_bytes_extension   ));
 
-  EXPECT_FALSE(message.HasExtension(unittest::optionalgroup_extension           ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_nested_message_extension ));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_foreign_message_extension));
-  EXPECT_FALSE(message.HasExtension(unittest::optional_import_message_extension ));
+  EXPECT_FALSE(message.HasExtension(unittest::optionalgroup_extension                 ));
+  EXPECT_FALSE(message.HasExtension(unittest::optional_nested_message_extension       ));
+  EXPECT_FALSE(message.HasExtension(unittest::optional_foreign_message_extension      ));
+  EXPECT_FALSE(message.HasExtension(unittest::optional_import_message_extension       ));
+  EXPECT_FALSE(message.HasExtension(unittest::optional_public_import_message_extension));
+  EXPECT_FALSE(message.HasExtension(unittest::optional_lazy_message_extension         ));
 
   EXPECT_FALSE(message.HasExtension(unittest::optional_nested_enum_extension ));
   EXPECT_FALSE(message.HasExtension(unittest::optional_foreign_enum_extension));
@@ -1337,15 +1391,19 @@ void TestUtil::ExpectExtensionsClear(
   EXPECT_EQ(""   , message.GetExtension(unittest::optional_bytes_extension   ));
 
   // Embedded messages should also be clear.
-  EXPECT_FALSE(message.GetExtension(unittest::optionalgroup_extension           ).has_a());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_nested_message_extension ).has_bb());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_foreign_message_extension).has_c());
-  EXPECT_FALSE(message.GetExtension(unittest::optional_import_message_extension ).has_d());
-
-  EXPECT_EQ(0, message.GetExtension(unittest::optionalgroup_extension           ).a());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_nested_message_extension ).bb());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_foreign_message_extension).c());
-  EXPECT_EQ(0, message.GetExtension(unittest::optional_import_message_extension ).d());
+  EXPECT_FALSE(message.GetExtension(unittest::optionalgroup_extension                 ).has_a());
+  EXPECT_FALSE(message.GetExtension(unittest::optional_nested_message_extension       ).has_bb());
+  EXPECT_FALSE(message.GetExtension(unittest::optional_foreign_message_extension      ).has_c());
+  EXPECT_FALSE(message.GetExtension(unittest::optional_import_message_extension       ).has_d());
+  EXPECT_FALSE(message.GetExtension(unittest::optional_public_import_message_extension).has_e());
+  EXPECT_FALSE(message.GetExtension(unittest::optional_lazy_message_extension         ).has_bb());
+
+  EXPECT_EQ(0, message.GetExtension(unittest::optionalgroup_extension                 ).a());
+  EXPECT_EQ(0, message.GetExtension(unittest::optional_nested_message_extension       ).bb());
+  EXPECT_EQ(0, message.GetExtension(unittest::optional_foreign_message_extension      ).c());
+  EXPECT_EQ(0, message.GetExtension(unittest::optional_import_message_extension       ).d());
+  EXPECT_EQ(0, message.GetExtension(unittest::optional_public_import_message_extension).e());
+  EXPECT_EQ(0, message.GetExtension(unittest::optional_lazy_message_extension         ).bb());
 
   // Enums without defaults are set to the first value in the enum.
   EXPECT_EQ(unittest::TestAllTypes::FOO, message.GetExtension(unittest::optional_nested_enum_extension ));
@@ -1376,6 +1434,7 @@ void TestUtil::ExpectExtensionsClear(
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_nested_message_extension ));
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_foreign_message_extension));
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
   EXPECT_EQ(0, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
@@ -1459,6 +1518,7 @@ void TestUtil::ExpectRepeatedExtensionsModified(
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
@@ -1486,6 +1546,7 @@ void TestUtil::ExpectRepeatedExtensionsModified(
   EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
   EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
   EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
+  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
@@ -1515,6 +1576,7 @@ void TestUtil::ExpectRepeatedExtensionsModified(
   EXPECT_EQ(518, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
   EXPECT_EQ(519, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
   EXPECT_EQ(520, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
+  EXPECT_EQ(527, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::FOO, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
   EXPECT_EQ(unittest::FOREIGN_FOO      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
@@ -1750,6 +1812,7 @@ void TestUtil::ExpectLastRepeatedsRemoved(
   ASSERT_EQ(1, message.repeated_nested_message_size ());
   ASSERT_EQ(1, message.repeated_foreign_message_size());
   ASSERT_EQ(1, message.repeated_import_message_size ());
+  ASSERT_EQ(1, message.repeated_import_message_size ());
   ASSERT_EQ(1, message.repeated_nested_enum_size    ());
   ASSERT_EQ(1, message.repeated_foreign_enum_size   ());
   ASSERT_EQ(1, message.repeated_import_enum_size    ());
@@ -1780,6 +1843,7 @@ void TestUtil::ExpectLastRepeatedsRemoved(
   EXPECT_EQ(218, message.repeated_nested_message (0).bb());
   EXPECT_EQ(219, message.repeated_foreign_message(0).c());
   EXPECT_EQ(220, message.repeated_import_message (0).d());
+  EXPECT_EQ(220, message.repeated_import_message (0).d());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (0));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(0));
@@ -1810,6 +1874,7 @@ void TestUtil::ExpectLastRepeatedExtensionsRemoved(
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_message_extension ));
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_message_extension));
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
   ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
@@ -1838,6 +1903,7 @@ void TestUtil::ExpectLastRepeatedExtensionsRemoved(
   EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
   EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
   EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
+  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
@@ -1847,6 +1913,36 @@ void TestUtil::ExpectLastRepeatedExtensionsRemoved(
   EXPECT_EQ("225", message.GetExtension(unittest::repeated_cord_extension, 0));
 }
 
+void TestUtil::ExpectLastRepeatedsReleased(
+    const unittest::TestAllTypes& message) {
+  ASSERT_EQ(1, message.repeatedgroup_size           ());
+  ASSERT_EQ(1, message.repeated_nested_message_size ());
+  ASSERT_EQ(1, message.repeated_foreign_message_size());
+  ASSERT_EQ(1, message.repeated_import_message_size ());
+  ASSERT_EQ(1, message.repeated_import_message_size ());
+
+  EXPECT_EQ(217, message.repeatedgroup           (0).a());
+  EXPECT_EQ(218, message.repeated_nested_message (0).bb());
+  EXPECT_EQ(219, message.repeated_foreign_message(0).c());
+  EXPECT_EQ(220, message.repeated_import_message (0).d());
+  EXPECT_EQ(220, message.repeated_import_message (0).d());
+}
+
+void TestUtil::ExpectLastRepeatedExtensionsReleased(
+    const unittest::TestAllExtensions& message) {
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeatedgroup_extension           ));
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_nested_message_extension ));
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_foreign_message_extension));
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  ASSERT_EQ(1, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
+
+  EXPECT_EQ(217, message.GetExtension(unittest::repeatedgroup_extension           , 0).a());
+  EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
+  EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
+  EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
+  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
+}
+
 void TestUtil::ExpectRepeatedsSwapped(
     const unittest::TestAllTypes& message) {
   ASSERT_EQ(2, message.repeated_int32_size   ());
@@ -1869,6 +1965,7 @@ void TestUtil::ExpectRepeatedsSwapped(
   ASSERT_EQ(2, message.repeated_nested_message_size ());
   ASSERT_EQ(2, message.repeated_foreign_message_size());
   ASSERT_EQ(2, message.repeated_import_message_size ());
+  ASSERT_EQ(2, message.repeated_import_message_size ());
   ASSERT_EQ(2, message.repeated_nested_enum_size    ());
   ASSERT_EQ(2, message.repeated_foreign_enum_size   ());
   ASSERT_EQ(2, message.repeated_import_enum_size    ());
@@ -1899,6 +1996,7 @@ void TestUtil::ExpectRepeatedsSwapped(
   EXPECT_EQ(218, message.repeated_nested_message (1).bb());
   EXPECT_EQ(219, message.repeated_foreign_message(1).c());
   EXPECT_EQ(220, message.repeated_import_message (1).d());
+  EXPECT_EQ(220, message.repeated_import_message (1).d());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.repeated_nested_enum (1));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.repeated_foreign_enum(1));
@@ -1924,6 +2022,7 @@ void TestUtil::ExpectRepeatedsSwapped(
   EXPECT_EQ(318, message.repeated_nested_message (0).bb());
   EXPECT_EQ(319, message.repeated_foreign_message(0).c());
   EXPECT_EQ(320, message.repeated_import_message (0).d());
+  EXPECT_EQ(320, message.repeated_import_message (0).d());
 
   EXPECT_EQ(unittest::TestAllTypes::BAZ, message.repeated_nested_enum (0));
   EXPECT_EQ(unittest::FOREIGN_BAZ      , message.repeated_foreign_enum(0));
@@ -1953,6 +2052,7 @@ void TestUtil::ExpectRepeatedExtensionsSwapped(
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_message_extension ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_message_extension));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_message_extension ));
+  ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_lazy_message_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_nested_enum_extension    ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_foreign_enum_extension   ));
   ASSERT_EQ(2, message.ExtensionSize(unittest::repeated_import_enum_extension    ));
@@ -1980,6 +2080,7 @@ void TestUtil::ExpectRepeatedExtensionsSwapped(
   EXPECT_EQ(218, message.GetExtension(unittest::repeated_nested_message_extension , 1).bb());
   EXPECT_EQ(219, message.GetExtension(unittest::repeated_foreign_message_extension, 1).c());
   EXPECT_EQ(220, message.GetExtension(unittest::repeated_import_message_extension , 1).d());
+  EXPECT_EQ(227, message.GetExtension(unittest::repeated_lazy_message_extension   , 1).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAR, message.GetExtension(unittest::repeated_nested_enum_extension , 1));
   EXPECT_EQ(unittest::FOREIGN_BAR      , message.GetExtension(unittest::repeated_foreign_enum_extension, 1));
@@ -2008,6 +2109,7 @@ void TestUtil::ExpectRepeatedExtensionsSwapped(
   EXPECT_EQ(318, message.GetExtension(unittest::repeated_nested_message_extension , 0).bb());
   EXPECT_EQ(319, message.GetExtension(unittest::repeated_foreign_message_extension, 0).c());
   EXPECT_EQ(320, message.GetExtension(unittest::repeated_import_message_extension , 0).d());
+  EXPECT_EQ(327, message.GetExtension(unittest::repeated_lazy_message_extension   , 0).bb());
 
   EXPECT_EQ(unittest::TestAllTypes::BAZ, message.GetExtension(unittest::repeated_nested_enum_extension , 0));
   EXPECT_EQ(unittest::FOREIGN_BAZ      , message.GetExtension(unittest::repeated_foreign_enum_extension, 0));
@@ -2031,6 +2133,8 @@ TestUtil::ReflectionTester::ReflectionTester(
     pool->FindFieldByName("protobuf_unittest.ForeignMessage.c");
   import_d_ =
     pool->FindFieldByName("protobuf_unittest_import.ImportMessage.d");
+  import_e_ =
+    pool->FindFieldByName("protobuf_unittest_import.PublicImportMessage.e");
   nested_foo_ =
     pool->FindEnumValueByName("protobuf_unittest.TestAllTypes.FOO");
   nested_bar_ =
@@ -2067,6 +2171,7 @@ TestUtil::ReflectionTester::ReflectionTester(
   EXPECT_TRUE(nested_b_         != NULL);
   EXPECT_TRUE(foreign_c_        != NULL);
   EXPECT_TRUE(import_d_         != NULL);
+  EXPECT_TRUE(import_e_         != NULL);
   EXPECT_TRUE(nested_foo_       != NULL);
   EXPECT_TRUE(nested_bar_       != NULL);
   EXPECT_TRUE(nested_baz_       != NULL);
@@ -2129,6 +2234,12 @@ void TestUtil::ReflectionTester::SetAllFieldsViaReflection(Message* message) {
   reflection->SetString(message, F("optional_string_piece"), "124");
   reflection->SetString(message, F("optional_cord"), "125");
 
+  sub_message = reflection->MutableMessage(message, F("optional_public_import_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, import_e_, 126);
+
+  sub_message = reflection->MutableMessage(message, F("optional_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 127);
+
   // -----------------------------------------------------------------
 
   reflection->AddInt32 (message, F("repeated_int32"   ), 201);
@@ -2155,6 +2266,8 @@ void TestUtil::ReflectionTester::SetAllFieldsViaReflection(Message* message) {
   sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 219);
   sub_message = reflection->AddMessage(message, F("repeated_import_message"));
   sub_message->GetReflection()->SetInt32(sub_message, import_d_, 220);
+  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 227);
 
   reflection->AddEnum(message, F("repeated_nested_enum" ),  nested_bar_);
   reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_bar_);
@@ -2188,6 +2301,8 @@ void TestUtil::ReflectionTester::SetAllFieldsViaReflection(Message* message) {
   sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 319);
   sub_message = reflection->AddMessage(message, F("repeated_import_message"));
   sub_message->GetReflection()->SetInt32(sub_message, import_d_, 320);
+  sub_message = reflection->AddMessage(message, F("repeated_lazy_message"));
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 327);
 
   reflection->AddEnum(message, F("repeated_nested_enum" ),  nested_baz_);
   reflection->AddEnum(message, F("repeated_foreign_enum"), foreign_baz_);
@@ -2289,10 +2404,12 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
   EXPECT_TRUE(reflection->HasField(message, F("optional_string"  )));
   EXPECT_TRUE(reflection->HasField(message, F("optional_bytes"   )));
 
-  EXPECT_TRUE(reflection->HasField(message, F("optionalgroup"           )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_message" )));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_message")));
-  EXPECT_TRUE(reflection->HasField(message, F("optional_import_message" )));
+  EXPECT_TRUE(reflection->HasField(message, F("optionalgroup"                 )));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_nested_message"       )));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_message"      )));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_import_message"       )));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_public_import_message")));
+  EXPECT_TRUE(reflection->HasField(message, F("optional_lazy_message"         )));
 
   sub_message = &reflection->GetMessage(message, F("optionalgroup"));
   EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, group_a_));
@@ -2302,6 +2419,10 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
   EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, foreign_c_));
   sub_message = &reflection->GetMessage(message, F("optional_import_message"));
   EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
+  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_TRUE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
 
   EXPECT_TRUE(reflection->HasField(message, F("optional_nested_enum" )));
   EXPECT_TRUE(reflection->HasField(message, F("optional_foreign_enum")));
@@ -2337,6 +2458,10 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
   EXPECT_EQ(119, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
   sub_message = &reflection->GetMessage(message, F("optional_import_message"));
   EXPECT_EQ(120, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_EQ(126, sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_EQ(127, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
 
   EXPECT_EQ( nested_baz_, reflection->GetEnum(message, F("optional_nested_enum" )));
   EXPECT_EQ(foreign_baz_, reflection->GetEnum(message, F("optional_foreign_enum")));
@@ -2347,6 +2472,7 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection1(
 
   EXPECT_EQ("125", reflection->GetString(message, F("optional_cord")));
   EXPECT_EQ("125", reflection->GetStringReference(message, F("optional_cord"), &scratch));
+
 }
 
 void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
@@ -2377,6 +2503,7 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_message" )));
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_message")));
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_message" )));
+  ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_lazy_message"   )));
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_nested_enum"    )));
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_foreign_enum"   )));
   ASSERT_EQ(2, reflection->FieldSize(message, F("repeated_import_enum"    )));
@@ -2411,6 +2538,8 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
   EXPECT_EQ(219, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
   sub_message = &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 0);
   EXPECT_EQ(220, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 0);
+  EXPECT_EQ(227, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
 
   EXPECT_EQ( nested_bar_, reflection->GetRepeatedEnum(message, F("repeated_nested_enum" ),0));
   EXPECT_EQ(foreign_bar_, reflection->GetRepeatedEnum(message, F("repeated_foreign_enum"),0));
@@ -2453,6 +2582,8 @@ void TestUtil::ReflectionTester::ExpectAllFieldsSetViaReflection2(
   EXPECT_EQ(319, sub_message->GetReflection()->GetInt32(*sub_message, foreign_c_));
   sub_message = &reflection->GetRepeatedMessage(message, F("repeated_import_message"), 1);
   EXPECT_EQ(320, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message = &reflection->GetRepeatedMessage(message, F("repeated_lazy_message"), 1);
+  EXPECT_EQ(327, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
 
   EXPECT_EQ( nested_baz_, reflection->GetRepeatedEnum(message, F("repeated_nested_enum" ),1));
   EXPECT_EQ(foreign_baz_, reflection->GetRepeatedEnum(message, F("repeated_foreign_enum"),1));
@@ -2609,6 +2740,8 @@ void TestUtil::ReflectionTester::ExpectClearViaReflection(
   EXPECT_FALSE(reflection->HasField(message, F("optional_nested_message" )));
   EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_message")));
   EXPECT_FALSE(reflection->HasField(message, F("optional_import_message" )));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_public_import_message")));
+  EXPECT_FALSE(reflection->HasField(message, F("optional_lazy_message")));
 
   EXPECT_FALSE(reflection->HasField(message, F("optional_nested_enum" )));
   EXPECT_FALSE(reflection->HasField(message, F("optional_foreign_enum")));
@@ -2650,6 +2783,12 @@ void TestUtil::ReflectionTester::ExpectClearViaReflection(
   sub_message = &reflection->GetMessage(message, F("optional_import_message"));
   EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_d_));
   EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_d_));
+  sub_message = &reflection->GetMessage(message, F("optional_public_import_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, import_e_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, import_e_));
+  sub_message = &reflection->GetMessage(message, F("optional_lazy_message"));
+  EXPECT_FALSE(sub_message->GetReflection()->HasField(*sub_message, nested_b_));
+  EXPECT_EQ(0, sub_message->GetReflection()->GetInt32(*sub_message, nested_b_));
 
   // Enums without defaults are set to the first value in the enum.
   EXPECT_EQ( nested_foo_, reflection->GetEnum(message, F("optional_nested_enum" )));
@@ -2683,6 +2822,7 @@ void TestUtil::ReflectionTester::ExpectClearViaReflection(
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_message" )));
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_message")));
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_message" )));
+  EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_lazy_message"   )));
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_nested_enum"    )));
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_foreign_enum"   )));
   EXPECT_EQ(0, reflection->FieldSize(message, F("repeated_import_enum"    )));
@@ -2796,6 +2936,8 @@ void TestUtil::ReflectionTester::ModifyRepeatedFieldsViaReflection(
   sub_message->GetReflection()->SetInt32(sub_message, foreign_c_, 519);
   sub_message = reflection->MutableRepeatedMessage(message, F("repeated_import_message"), 1);
   sub_message->GetReflection()->SetInt32(sub_message, import_d_, 520);
+  sub_message = reflection->MutableRepeatedMessage(message, F("repeated_lazy_message"), 1);
+  sub_message->GetReflection()->SetInt32(sub_message, nested_b_, 527);
 
   reflection->SetRepeatedEnum(message, F("repeated_nested_enum" ), 1,  nested_foo_);
   reflection->SetRepeatedEnum(message, F("repeated_foreign_enum"), 1, foreign_foo_);
@@ -2824,7 +2966,8 @@ void TestUtil::ReflectionTester::ModifyPackedFieldsViaReflection(
   reflection->SetRepeatedEnum  (message, F("packed_enum"    ), 1, foreign_foo_);
 }
 
-void TestUtil::ReflectionTester::RemoveLastRepeatedsViaReflection(Message* message) {
+void TestUtil::ReflectionTester::RemoveLastRepeatedsViaReflection(
+    Message* message) {
   const Reflection* reflection = message->GetReflection();
 
   vector<const FieldDescriptor*> output;
@@ -2837,6 +2980,26 @@ void TestUtil::ReflectionTester::RemoveLastRepeatedsViaReflection(Message* messa
   }
 }
 
+void TestUtil::ReflectionTester::ReleaseLastRepeatedsViaReflection(
+    Message* message, bool expect_extensions_notnull) {
+  const Reflection* reflection = message->GetReflection();
+
+  vector<const FieldDescriptor*> output;
+  reflection->ListFields(*message, &output);
+  for (int i=0; i<output.size(); ++i) {
+    const FieldDescriptor* field = output[i];
+    if (!field->is_repeated()) continue;
+    if (field->cpp_type() != FieldDescriptor::CPPTYPE_MESSAGE) continue;
+
+    Message* released = reflection->ReleaseLast(message, field);
+    if (!field->is_extension() || expect_extensions_notnull) {
+      ASSERT_TRUE(released != NULL) << "ReleaseLast returned NULL for: "
+                                    << field->name();
+    }
+    delete released;
+  }
+}
+
 void TestUtil::ReflectionTester::SwapRepeatedsViaReflection(Message* message) {
   const Reflection* reflection = message->GetReflection();
 
@@ -2850,5 +3013,35 @@ void TestUtil::ReflectionTester::SwapRepeatedsViaReflection(Message* message) {
   }
 }
 
+void TestUtil::ReflectionTester::ExpectMessagesReleasedViaReflection(
+    Message* message,
+    TestUtil::ReflectionTester::MessageReleaseState expected_release_state) {
+  const Reflection* reflection = message->GetReflection();
+
+  static const char* fields[] = {
+    "optionalgroup",
+    "optional_nested_message",
+    "optional_foreign_message",
+    "optional_import_message",
+  };
+  for (int i = 0; i < GOOGLE_ARRAYSIZE(fields); i++) {
+    const Message& sub_message = reflection->GetMessage(*message, F(fields[i]));
+    Message* released = reflection->ReleaseMessage(message, F(fields[i]));
+    switch (expected_release_state) {
+      case IS_NULL:
+        EXPECT_TRUE(released == NULL);
+        break;
+      case NOT_NULL:
+        EXPECT_TRUE(released != NULL);
+        EXPECT_EQ(&sub_message, released);
+        break;
+      case CAN_BE_NULL:
+        break;
+    }
+    delete released;
+    EXPECT_FALSE(reflection->HasField(*message, F(fields[i])));
+  }
+}
+
 }  // namespace protobuf
 }  // namespace google