Merge pull request #654 from jtattermusch/csharp_hide_freeze

Remove the C# Freeze API

35 files changed, 8 insertions, 1498 deletions

diff --git a/Makefile.am b/Makefile.am
index c8e730f9..3c0cea5a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -99,7 +99,6 @@ csharp_EXTRA_DIST=                                                           \
   csharp/src/Google.Protobuf/Collections/RepeatedField.cs                    \
   csharp/src/Google.Protobuf/FieldCodec.cs                                   \
   csharp/src/Google.Protobuf/FrameworkPortability.cs                         \
-  csharp/src/Google.Protobuf/Freezable.cs                                    \
   csharp/src/Google.Protobuf/Google.Protobuf.csproj                          \
   csharp/src/Google.Protobuf/Google.Protobuf.nuspec                          \
   csharp/src/Google.Protobuf/IMessage.cs                                     \
diff --git a/csharp/src/AddressBook/Addressbook.cs b/csharp/src/AddressBook/Addressbook.cs
index 231f1d09..f55800e6 100644
--- a/csharp/src/AddressBook/Addressbook.cs
+++ b/csharp/src/AddressBook/Addressbook.cs
@@ -74,20 +74,11 @@ namespace Google.Protobuf.Examples.AddressBook {
       return new Person(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      phones_.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -97,7 +88,6 @@ namespace Google.Protobuf.Examples.AddressBook {
     public int Id {
       get { return id_; }
       set {
-        pb::Freezable.CheckMutable(this);
         id_ = value;
       }
     }
@@ -107,7 +97,6 @@ namespace Google.Protobuf.Examples.AddressBook {
     public string Email {
       get { return email_; }
       set {
-        pb::Freezable.CheckMutable(this);
         email_ = value ?? "";
       }
     }
@@ -269,19 +258,11 @@ namespace Google.Protobuf.Examples.AddressBook {
           return new PhoneNumber(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int NumberFieldNumber = 1;
         private string number_ = "";
         public string Number {
           get { return number_; }
           set {
-            pb::Freezable.CheckMutable(this);
             number_ = value ?? "";
           }
         }
@@ -291,7 +272,6 @@ namespace Google.Protobuf.Examples.AddressBook {
         public global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType Type {
           get { return type_; }
           set {
-            pb::Freezable.CheckMutable(this);
             type_ = value;
           }
         }
@@ -417,14 +397,6 @@ namespace Google.Protobuf.Examples.AddressBook {
       return new AddressBook(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      people_.Freeze();
-    }
-
     public const int PeopleFieldNumber = 1;
     private static readonly pb::FieldCodec<global::Google.Protobuf.Examples.AddressBook.Person> _repeated_people_codec
         = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.Examples.AddressBook.Person.Parser);
diff --git a/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs b/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
index 46d3bd9a..c62ac046 100644
--- a/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Collections/MapFieldTest.cs
@@ -45,53 +45,6 @@ namespace Google.Protobuf.Collections
     /// </summary>
     public class MapFieldTest
     {
-        // Protobuf-specific tests
-        [Test]
-        public void Freeze_FreezesMessages()
-        {
-            var message = new ForeignMessage { C = 20 };
-            var map = new MapField<string, ForeignMessage> { { "x", message } };
-            map.Freeze();
-            Assert.IsTrue(message.IsFrozen);
-        }
-
-        [Test]
-        public void Freeze_Idempotent()
-        {
-            var message = new ForeignMessage { C = 20 };
-            var map = new MapField<string, ForeignMessage> { { "x", message } };
-            Assert.IsFalse(map.IsFrozen);
-            map.Freeze();
-            Assert.IsTrue(message.IsFrozen);
-            map.Freeze();
-            Assert.IsTrue(message.IsFrozen);
-        }
-
-        [Test]
-        public void Freeze_PreventsMutation()
-        {
-            var map = new MapField<string, string>();
-            map.Freeze();
-            Assert.IsTrue(map.IsFrozen);
-            Assert.IsTrue(map.IsReadOnly);
-            ICollection<KeyValuePair<string, string>> collection = map;
-            Assert.Throws<InvalidOperationException>(() => map["x"] = "y");
-            Assert.Throws<InvalidOperationException>(() => map.Add("x", "y"));
-            Assert.Throws<InvalidOperationException>(() => map.Remove("x"));
-            Assert.Throws<InvalidOperationException>(() => map.Clear());
-            Assert.Throws<InvalidOperationException>(() => collection.Add(NewKeyValuePair("x", "y")));
-            Assert.Throws<InvalidOperationException>(() => collection.Remove(NewKeyValuePair("x", "y")));
-        }
-
-        [Test]
-        public void Clone_ReturnsNonFrozen()
-        {
-            var map = new MapField<string, string>();
-            map.Freeze();
-            var clone = map.Clone();
-            clone.Add("x", "y");
-        }
-
         [Test]
         public void Clone_ClonesMessages()
         {
@@ -422,10 +375,6 @@ namespace Google.Protobuf.Collections
             dictionary.Remove("x");
             Assert.AreEqual(0, dictionary.Count);
             Assert.Throws<ArgumentNullException>(() => dictionary.Remove(null));
-
-            map.Freeze();
-            // Call should fail even though it clearly doesn't contain 5 as a key.
-            Assert.Throws<InvalidOperationException>(() => dictionary.Remove(5));
         }
 
         [Test]
@@ -449,8 +398,6 @@ namespace Google.Protobuf.Collections
             var map = new MapField<string, string> { { "x", "y" } };
             IDictionary dictionary = map;
             Assert.IsFalse(dictionary.IsFixedSize);
-            map.Freeze();
-            Assert.IsTrue(dictionary.IsFixedSize);
         }
 
         [Test]
@@ -504,9 +451,6 @@ namespace Google.Protobuf.Collections
             Assert.Throws<InvalidCastException>(() => dictionary["x"] = 5);
             Assert.Throws<ArgumentNullException>(() => dictionary[null] = "z");
             Assert.Throws<ArgumentNullException>(() => dictionary["x"] = null);
-            map.Freeze();
-            // Note: Not InvalidOperationException.
-            Assert.Throws<NotSupportedException>(() => dictionary["a"] = "c");
         }
 
         [Test]
diff --git a/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs b/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
index 25be7731..33c4e10c 100644
--- a/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
+++ b/csharp/src/Google.Protobuf.Test/Collections/RepeatedFieldTest.cs
@@ -194,43 +194,9 @@ namespace Google.Protobuf.Collections
         }
 
         [Test]
-        public void Freeze_FreezesElements()
-        {
-            var list = new RepeatedField<TestAllTypes> { new TestAllTypes() };
-            Assert.IsFalse(list[0].IsFrozen);
-            list.Freeze();
-            Assert.IsTrue(list[0].IsFrozen);
-        }
-
-        [Test]
-        public void Freeze_PreventsMutations()
-        {
-            var list = new RepeatedField<int> { 0 };
-            list.Freeze();
-            Assert.Throws<InvalidOperationException>(() => list.Add(1));
-            Assert.Throws<InvalidOperationException>(() => list[0] = 1);
-            Assert.Throws<InvalidOperationException>(() => list.Clear());
-            Assert.Throws<InvalidOperationException>(() => list.RemoveAt(0));
-            Assert.Throws<InvalidOperationException>(() => list.Remove(0));
-            Assert.Throws<InvalidOperationException>(() => list.Insert(0, 0));
-        }
-
-        [Test]
-        public void Freeze_ReportsFrozen()
-        {
-            var list = new RepeatedField<int> { 0 };
-            Assert.IsFalse(list.IsFrozen);
-            Assert.IsFalse(list.IsReadOnly);
-            list.Freeze();
-            Assert.IsTrue(list.IsFrozen);
-            Assert.IsTrue(list.IsReadOnly);
-        }
-
-        [Test]
         public void Clone_ReturnsMutable()
         {
             var list = new RepeatedField<int> { 0 };
-            list.Freeze();
             var clone = list.Clone();
             clone[0] = 1;
         }
@@ -585,8 +551,6 @@ namespace Google.Protobuf.Collections
             var field = new RepeatedField<string> { "first", "second" };
             IList list = field;
             Assert.IsFalse(list.IsFixedSize);
-            field.Freeze();
-            Assert.IsTrue(list.IsFixedSize);
         }
 
         [Test]
diff --git a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
index 528a4023..dfaac48c 100644
--- a/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
+++ b/csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs
@@ -504,23 +504,6 @@ namespace Google.Protobuf
         }

 

         [Test]

-        public void Freeze()

-        {

-            var frozen = new TestAllTypes();

-            frozen.Freeze();

-            Assert.IsTrue(frozen.IsFrozen);

-

-            Assert.Throws<InvalidOperationException>(() => frozen.ClearOneofField());

-            Assert.Throws<InvalidOperationException>(() => frozen.SingleInt32 = 0);

-            Assert.Throws<InvalidOperationException>(() => frozen.SingleNestedMessage = null);

-            Assert.Throws<InvalidOperationException>(() => frozen.SingleNestedEnum = 0);

-            Assert.Throws<InvalidOperationException>(() => frozen.OneofString = null);

-            Assert.Throws<InvalidOperationException>(() => frozen.OneofUint32 = 0U);

-            Assert.Throws<InvalidOperationException>(() => frozen.RepeatedDouble.Add(0.0));

-            Assert.Throws<InvalidOperationException>(() => frozen.RepeatedNestedMessage.Add(new TestAllTypes.Types.NestedMessage()));

-        }

-

-        [Test]

         public void OneofProperties()

         {

             // Switch the oneof case between each of the different options, and check everything behaves

diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
index 7da82bf0..2c87943f 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
@@ -216,30 +216,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestMap(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      mapInt32Int32_.Freeze();
-      mapInt64Int64_.Freeze();
-      mapUint32Uint32_.Freeze();
-      mapUint64Uint64_.Freeze();
-      mapSint32Sint32_.Freeze();
-      mapSint64Sint64_.Freeze();
-      mapFixed32Fixed32_.Freeze();
-      mapFixed64Fixed64_.Freeze();
-      mapSfixed32Sfixed32_.Freeze();
-      mapSfixed64Sfixed64_.Freeze();
-      mapInt32Float_.Freeze();
-      mapInt32Double_.Freeze();
-      mapBoolBool_.Freeze();
-      mapStringString_.Freeze();
-      mapInt32Bytes_.Freeze();
-      mapInt32Enum_.Freeze();
-      mapInt32ForeignMessage_.Freeze();
-    }
-
     public const int MapInt32Int32FieldNumber = 1;
     private static readonly pbc::MapField<int, int>.Codec _map_mapInt32Int32_codec
         = new pbc::MapField<int, int>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForInt32(16), 10);
@@ -613,20 +589,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestMapSubmessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (testMap_ != null) TestMap.Freeze();
-    }
-
     public const int TestMapFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestMap testMap_;
     public global::Google.Protobuf.TestProtos.TestMap TestMap {
       get { return testMap_; }
       set {
-        pb::Freezable.CheckMutable(this);
         testMap_ = value;
       }
     }
@@ -737,14 +704,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestMessageMap(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      mapInt32Message_.Freeze();
-    }
-
     public const int MapInt32MessageFieldNumber = 1;
     private static readonly pbc::MapField<int, global::Google.Protobuf.TestProtos.TestAllTypes>.Codec _map_mapInt32Message_codec
         = new pbc::MapField<int, global::Google.Protobuf.TestProtos.TestAllTypes>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForMessage(18, global::Google.Protobuf.TestProtos.TestAllTypes.Parser), 10);
@@ -847,15 +806,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestSameTypeMap(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      map1_.Freeze();
-      map2_.Freeze();
-    }
-
     public const int Map1FieldNumber = 1;
     private static readonly pbc::MapField<int, int>.Codec _map_map1_codec
         = new pbc::MapField<int, int>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForInt32(16), 10);
@@ -988,28 +938,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestArenaMap(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      mapInt32Int32_.Freeze();
-      mapInt64Int64_.Freeze();
-      mapUint32Uint32_.Freeze();
-      mapUint64Uint64_.Freeze();
-      mapSint32Sint32_.Freeze();
-      mapSint64Sint64_.Freeze();
-      mapFixed32Fixed32_.Freeze();
-      mapFixed64Fixed64_.Freeze();
-      mapSfixed32Sfixed32_.Freeze();
-      mapSfixed64Sfixed64_.Freeze();
-      mapInt32Float_.Freeze();
-      mapInt32Double_.Freeze();
-      mapBoolBool_.Freeze();
-      mapInt32Enum_.Freeze();
-      mapInt32ForeignMessage_.Freeze();
-    }
-
     public const int MapInt32Int32FieldNumber = 1;
     private static readonly pbc::MapField<int, int>.Codec _map_mapInt32Int32_codec
         = new pbc::MapField<int, int>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForInt32(16), 10);
@@ -1349,14 +1277,6 @@ namespace Google.Protobuf.TestProtos {
       return new MessageContainingEnumCalledType(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      type_.Freeze();
-    }
-
     public const int TypeFieldNumber = 1;
     private static readonly pbc::MapField<int, global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType>.Codec _map_type_codec
         = new pbc::MapField<int, global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForMessage(18, global::Google.Protobuf.TestProtos.MessageContainingEnumCalledType.Parser), 10);
@@ -1468,14 +1388,6 @@ namespace Google.Protobuf.TestProtos {
       return new MessageContainingMapCalledEntry(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      entry_.Freeze();
-    }
-
     public const int EntryFieldNumber = 1;
     private static readonly pbc::MapField<int, int>.Codec _map_entry_codec
         = new pbc::MapField<int, int>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForInt32(16), 10);
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
index 517225b6..07ed125d 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
@@ -79,19 +79,11 @@ namespace Google.Protobuf.TestProtos {
       return new ImportMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DFieldNumber = 1;
     private int d_;
     public int D {
       get { return d_; }
       set {
-        pb::Freezable.CheckMutable(this);
         d_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
index 11ec29dd..71403fbb 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
@@ -65,19 +65,11 @@ namespace Google.Protobuf.TestProtos {
       return new PublicImportMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int EFieldNumber = 1;
     private int e_;
     public int E {
       get { return e_; }
       set {
-        pb::Freezable.CheckMutable(this);
         e_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
index 07466650..f09d6769 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
@@ -96,13 +96,6 @@ namespace UnitTest.Issues.TestProtos {
       return new Issue307(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as Issue307);
     }
@@ -187,13 +180,6 @@ namespace UnitTest.Issues.TestProtos {
           return new NestedOnce(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public override bool Equals(object other) {
           return Equals(other as NestedOnce);
         }
@@ -278,13 +264,6 @@ namespace UnitTest.Issues.TestProtos {
               return new NestedTwice(this);
             }
 
-            public void Freeze() {
-              if (IsFrozen) {
-                return;
-              }
-              _frozen = true;
-            }
-
             public override bool Equals(object other) {
               return Equals(other as NestedTwice);
             }
@@ -381,21 +360,11 @@ namespace UnitTest.Issues.TestProtos {
       return new NegativeEnumMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      values_.Freeze();
-      packedValues_.Freeze();
-    }
-
     public const int ValueFieldNumber = 1;
     private global::UnitTest.Issues.TestProtos.NegativeEnum value_ = global::UnitTest.Issues.TestProtos.NegativeEnum.NEGATIVE_ENUM_ZERO;
     public global::UnitTest.Issues.TestProtos.NegativeEnum Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -535,13 +504,6 @@ namespace UnitTest.Issues.TestProtos {
       return new DeprecatedChild(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as DeprecatedChild);
     }
@@ -631,24 +593,12 @@ namespace UnitTest.Issues.TestProtos {
       return new DeprecatedFieldsMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      primitiveArray_.Freeze();
-      if (messageValue_ != null) MessageValue.Freeze();
-      messageArray_.Freeze();
-      enumArray_.Freeze();
-    }
-
     public const int PrimitiveValueFieldNumber = 1;
     private int primitiveValue_;
     [global::System.ObsoleteAttribute()]
     public int PrimitiveValue {
       get { return primitiveValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         primitiveValue_ = value;
       }
     }
@@ -668,7 +618,6 @@ namespace UnitTest.Issues.TestProtos {
     public global::UnitTest.Issues.TestProtos.DeprecatedChild MessageValue {
       get { return messageValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         messageValue_ = value;
       }
     }
@@ -688,7 +637,6 @@ namespace UnitTest.Issues.TestProtos {
     public global::UnitTest.Issues.TestProtos.DeprecatedEnum EnumValue {
       get { return enumValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         enumValue_ = value;
       }
     }
@@ -869,19 +817,11 @@ namespace UnitTest.Issues.TestProtos {
       return new ItemField(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ItemFieldNumber = 1;
     private int item_;
     public int Item {
       get { return item_; }
       set {
-        pb::Freezable.CheckMutable(this);
         item_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
index 3d72c5a0..4d98cc25 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
@@ -307,46 +307,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestAllTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (singleNestedMessage_ != null) SingleNestedMessage.Freeze();
-      if (singleForeignMessage_ != null) SingleForeignMessage.Freeze();
-      if (singleImportMessage_ != null) SingleImportMessage.Freeze();
-      if (singlePublicImportMessage_ != null) SinglePublicImportMessage.Freeze();
-      repeatedInt32_.Freeze();
-      repeatedInt64_.Freeze();
-      repeatedUint32_.Freeze();
-      repeatedUint64_.Freeze();
-      repeatedSint32_.Freeze();
-      repeatedSint64_.Freeze();
-      repeatedFixed32_.Freeze();
-      repeatedFixed64_.Freeze();
-      repeatedSfixed32_.Freeze();
-      repeatedSfixed64_.Freeze();
-      repeatedFloat_.Freeze();
-      repeatedDouble_.Freeze();
-      repeatedBool_.Freeze();
-      repeatedString_.Freeze();
-      repeatedBytes_.Freeze();
-      repeatedNestedMessage_.Freeze();
-      repeatedForeignMessage_.Freeze();
-      repeatedImportMessage_.Freeze();
-      repeatedNestedEnum_.Freeze();
-      repeatedForeignEnum_.Freeze();
-      repeatedImportEnum_.Freeze();
-      repeatedPublicImportMessage_.Freeze();
-      if (oneofField_ is IFreezable) ((IFreezable) oneofField_).Freeze();
-    }
-
     public const int SingleInt32FieldNumber = 1;
     private int singleInt32_;
     public int SingleInt32 {
       get { return singleInt32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleInt32_ = value;
       }
     }
@@ -356,7 +321,6 @@ namespace Google.Protobuf.TestProtos {
     public long SingleInt64 {
       get { return singleInt64_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleInt64_ = value;
       }
     }
@@ -366,7 +330,6 @@ namespace Google.Protobuf.TestProtos {
     public uint SingleUint32 {
       get { return singleUint32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleUint32_ = value;
       }
     }
@@ -376,7 +339,6 @@ namespace Google.Protobuf.TestProtos {
     public ulong SingleUint64 {
       get { return singleUint64_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleUint64_ = value;
       }
     }
@@ -386,7 +348,6 @@ namespace Google.Protobuf.TestProtos {
     public int SingleSint32 {
       get { return singleSint32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleSint32_ = value;
       }
     }
@@ -396,7 +357,6 @@ namespace Google.Protobuf.TestProtos {
     public long SingleSint64 {
       get { return singleSint64_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleSint64_ = value;
       }
     }
@@ -406,7 +366,6 @@ namespace Google.Protobuf.TestProtos {
     public uint SingleFixed32 {
       get { return singleFixed32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleFixed32_ = value;
       }
     }
@@ -416,7 +375,6 @@ namespace Google.Protobuf.TestProtos {
     public ulong SingleFixed64 {
       get { return singleFixed64_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleFixed64_ = value;
       }
     }
@@ -426,7 +384,6 @@ namespace Google.Protobuf.TestProtos {
     public int SingleSfixed32 {
       get { return singleSfixed32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleSfixed32_ = value;
       }
     }
@@ -436,7 +393,6 @@ namespace Google.Protobuf.TestProtos {
     public long SingleSfixed64 {
       get { return singleSfixed64_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleSfixed64_ = value;
       }
     }
@@ -446,7 +402,6 @@ namespace Google.Protobuf.TestProtos {
     public float SingleFloat {
       get { return singleFloat_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleFloat_ = value;
       }
     }
@@ -456,7 +411,6 @@ namespace Google.Protobuf.TestProtos {
     public double SingleDouble {
       get { return singleDouble_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleDouble_ = value;
       }
     }
@@ -466,7 +420,6 @@ namespace Google.Protobuf.TestProtos {
     public bool SingleBool {
       get { return singleBool_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleBool_ = value;
       }
     }
@@ -476,7 +429,6 @@ namespace Google.Protobuf.TestProtos {
     public string SingleString {
       get { return singleString_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleString_ = value ?? "";
       }
     }
@@ -486,7 +438,6 @@ namespace Google.Protobuf.TestProtos {
     public pb::ByteString SingleBytes {
       get { return singleBytes_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleBytes_ = value ?? pb::ByteString.Empty;
       }
     }
@@ -496,7 +447,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage SingleNestedMessage {
       get { return singleNestedMessage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleNestedMessage_ = value;
       }
     }
@@ -506,7 +456,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ForeignMessage SingleForeignMessage {
       get { return singleForeignMessage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleForeignMessage_ = value;
       }
     }
@@ -516,7 +465,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ImportMessage SingleImportMessage {
       get { return singleImportMessage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleImportMessage_ = value;
       }
     }
@@ -526,7 +474,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedEnum SingleNestedEnum {
       get { return singleNestedEnum_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleNestedEnum_ = value;
       }
     }
@@ -536,7 +483,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ForeignEnum SingleForeignEnum {
       get { return singleForeignEnum_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleForeignEnum_ = value;
       }
     }
@@ -546,7 +492,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ImportEnum SingleImportEnum {
       get { return singleImportEnum_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleImportEnum_ = value;
       }
     }
@@ -556,7 +501,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.PublicImportMessage SinglePublicImportMessage {
       get { return singlePublicImportMessage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singlePublicImportMessage_ = value;
       }
     }
@@ -741,7 +685,6 @@ namespace Google.Protobuf.TestProtos {
     public uint OneofUint32 {
       get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) oneofField_ : 0; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
       }
@@ -751,7 +694,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage OneofNestedMessage {
       get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.OneofNestedMessage;
       }
@@ -761,7 +703,6 @@ namespace Google.Protobuf.TestProtos {
     public string OneofString {
       get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) oneofField_ : ""; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value ?? "";
         oneofFieldCase_ = OneofFieldOneofCase.OneofString;
       }
@@ -771,7 +712,6 @@ namespace Google.Protobuf.TestProtos {
     public pb::ByteString OneofBytes {
       get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) oneofField_ : pb::ByteString.Empty; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value ?? pb::ByteString.Empty;
         oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
       }
@@ -791,7 +731,6 @@ namespace Google.Protobuf.TestProtos {
     }
 
     public void ClearOneofField() {
-      pb::Freezable.CheckMutable(this);
       oneofFieldCase_ = OneofFieldOneofCase.None;
       oneofField_ = null;
     }
@@ -1551,19 +1490,11 @@ namespace Google.Protobuf.TestProtos {
           return new NestedMessage(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int BbFieldNumber = 1;
         private int bb_;
         public int Bb {
           get { return bb_; }
           set {
-            pb::Freezable.CheckMutable(this);
             bb_ = value;
           }
         }
@@ -1675,22 +1606,11 @@ namespace Google.Protobuf.TestProtos {
       return new NestedTestAllTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (child_ != null) Child.Freeze();
-      if (payload_ != null) Payload.Freeze();
-      repeatedChild_.Freeze();
-    }
-
     public const int ChildFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.NestedTestAllTypes child_;
     public global::Google.Protobuf.TestProtos.NestedTestAllTypes Child {
       get { return child_; }
       set {
-        pb::Freezable.CheckMutable(this);
         child_ = value;
       }
     }
@@ -1700,7 +1620,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestAllTypes Payload {
       get { return payload_; }
       set {
-        pb::Freezable.CheckMutable(this);
         payload_ = value;
       }
     }
@@ -1850,20 +1769,12 @@ namespace Google.Protobuf.TestProtos {
       return new TestDeprecatedFields(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DeprecatedInt32FieldNumber = 1;
     private int deprecatedInt32_;
     [global::System.ObsoleteAttribute()]
     public int DeprecatedInt32 {
       get { return deprecatedInt32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecatedInt32_ = value;
       }
     }
@@ -1968,19 +1879,11 @@ namespace Google.Protobuf.TestProtos {
       return new ForeignMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int CFieldNumber = 1;
     private int c_;
     public int C {
       get { return c_; }
       set {
-        pb::Freezable.CheckMutable(this);
         c_ = value;
       }
     }
@@ -2084,13 +1987,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestReservedFields(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as TestReservedFields);
     }
@@ -2175,20 +2071,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestForeignNested(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (foreignNested_ != null) ForeignNested.Freeze();
-    }
-
     public const int ForeignNestedFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage foreignNested_;
     public global::Google.Protobuf.TestProtos.TestAllTypes.Types.NestedMessage ForeignNested {
       get { return foreignNested_; }
       set {
-        pb::Freezable.CheckMutable(this);
         foreignNested_ = value;
       }
     }
@@ -2300,19 +2187,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestReallyLargeTagNumber(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int AFieldNumber = 1;
     private int a_;
     public int A {
       get { return a_; }
       set {
-        pb::Freezable.CheckMutable(this);
         a_ = value;
       }
     }
@@ -2322,7 +2201,6 @@ namespace Google.Protobuf.TestProtos {
     public int Bb {
       get { return bb_; }
       set {
-        pb::Freezable.CheckMutable(this);
         bb_ = value;
       }
     }
@@ -2444,20 +2322,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestRecursiveMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (a_ != null) A.Freeze();
-    }
-
     public const int AFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestRecursiveMessage a_;
     public global::Google.Protobuf.TestProtos.TestRecursiveMessage A {
       get { return a_; }
       set {
-        pb::Freezable.CheckMutable(this);
         a_ = value;
       }
     }
@@ -2467,7 +2336,6 @@ namespace Google.Protobuf.TestProtos {
     public int I {
       get { return i_; }
       set {
-        pb::Freezable.CheckMutable(this);
         i_ = value;
       }
     }
@@ -2594,20 +2462,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestMutualRecursionA(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (bb_ != null) Bb.Freeze();
-    }
-
     public const int BbFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestMutualRecursionB bb_;
     public global::Google.Protobuf.TestProtos.TestMutualRecursionB Bb {
       get { return bb_; }
       set {
-        pb::Freezable.CheckMutable(this);
         bb_ = value;
       }
     }
@@ -2719,20 +2578,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestMutualRecursionB(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (a_ != null) A.Freeze();
-    }
-
     public const int AFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestMutualRecursionA a_;
     public global::Google.Protobuf.TestProtos.TestMutualRecursionA A {
       get { return a_; }
       set {
-        pb::Freezable.CheckMutable(this);
         a_ = value;
       }
     }
@@ -2742,7 +2592,6 @@ namespace Google.Protobuf.TestProtos {
     public int OptionalInt32 {
       get { return optionalInt32_; }
       set {
-        pb::Freezable.CheckMutable(this);
         optionalInt32_ = value;
       }
     }
@@ -2876,24 +2725,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestCamelCaseFieldNames(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (messageField_ != null) MessageField.Freeze();
-      repeatedPrimitiveField_.Freeze();
-      repeatedStringField_.Freeze();
-      repeatedEnumField_.Freeze();
-      repeatedMessageField_.Freeze();
-    }
-
     public const int PrimitiveFieldFieldNumber = 1;
     private int primitiveField_;
     public int PrimitiveField {
       get { return primitiveField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         primitiveField_ = value;
       }
     }
@@ -2903,7 +2739,6 @@ namespace Google.Protobuf.TestProtos {
     public string StringField {
       get { return stringField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         stringField_ = value ?? "";
       }
     }
@@ -2913,7 +2748,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ForeignEnum EnumField {
       get { return enumField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         enumField_ = value;
       }
     }
@@ -2923,7 +2757,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.ForeignMessage MessageField {
       get { return messageField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         messageField_ = value;
       }
     }
@@ -3155,20 +2988,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestFieldOrderings(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (singleNestedMessage_ != null) SingleNestedMessage.Freeze();
-    }
-
     public const int MyStringFieldNumber = 11;
     private string myString_ = "";
     public string MyString {
       get { return myString_; }
       set {
-        pb::Freezable.CheckMutable(this);
         myString_ = value ?? "";
       }
     }
@@ -3178,7 +3002,6 @@ namespace Google.Protobuf.TestProtos {
     public long MyInt {
       get { return myInt_; }
       set {
-        pb::Freezable.CheckMutable(this);
         myInt_ = value;
       }
     }
@@ -3188,7 +3011,6 @@ namespace Google.Protobuf.TestProtos {
     public float MyFloat {
       get { return myFloat_; }
       set {
-        pb::Freezable.CheckMutable(this);
         myFloat_ = value;
       }
     }
@@ -3198,7 +3020,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestFieldOrderings.Types.NestedMessage SingleNestedMessage {
       get { return singleNestedMessage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         singleNestedMessage_ = value;
       }
     }
@@ -3359,19 +3180,11 @@ namespace Google.Protobuf.TestProtos {
           return new NestedMessage(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int OoFieldNumber = 2;
         private long oo_;
         public long Oo {
           get { return oo_; }
           set {
-            pb::Freezable.CheckMutable(this);
             oo_ = value;
           }
         }
@@ -3381,7 +3194,6 @@ namespace Google.Protobuf.TestProtos {
         public int Bb {
           get { return bb_; }
           set {
-            pb::Freezable.CheckMutable(this);
             bb_ = value;
           }
         }
@@ -3507,19 +3319,11 @@ namespace Google.Protobuf.TestProtos {
       return new SparseEnumMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int SparseEnumFieldNumber = 1;
     private global::Google.Protobuf.TestProtos.TestSparseEnum sparseEnum_ = global::Google.Protobuf.TestProtos.TestSparseEnum.TEST_SPARSE_ENUM_UNSPECIFIED;
     public global::Google.Protobuf.TestProtos.TestSparseEnum SparseEnum {
       get { return sparseEnum_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sparseEnum_ = value;
       }
     }
@@ -3624,19 +3428,11 @@ namespace Google.Protobuf.TestProtos {
       return new OneString(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private string data_ = "";
     public string Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value ?? "";
       }
     }
@@ -3741,14 +3537,6 @@ namespace Google.Protobuf.TestProtos {
       return new MoreString(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      data_.Freeze();
-    }
-
     public const int DataFieldNumber = 1;
     private static readonly pb::FieldCodec<string> _repeated_data_codec
         = pb::FieldCodec.ForString(10);
@@ -3850,19 +3638,11 @@ namespace Google.Protobuf.TestProtos {
       return new OneBytes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private pb::ByteString data_ = pb::ByteString.Empty;
     public pb::ByteString Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value ?? pb::ByteString.Empty;
       }
     }
@@ -3967,19 +3747,11 @@ namespace Google.Protobuf.TestProtos {
       return new MoreBytes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private pb::ByteString data_ = pb::ByteString.Empty;
     public pb::ByteString Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value ?? pb::ByteString.Empty;
       }
     }
@@ -4084,19 +3856,11 @@ namespace Google.Protobuf.TestProtos {
       return new Int32Message(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private int data_;
     public int Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value;
       }
     }
@@ -4201,19 +3965,11 @@ namespace Google.Protobuf.TestProtos {
       return new Uint32Message(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private uint data_;
     public uint Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value;
       }
     }
@@ -4318,19 +4074,11 @@ namespace Google.Protobuf.TestProtos {
       return new Int64Message(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private long data_;
     public long Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value;
       }
     }
@@ -4435,19 +4183,11 @@ namespace Google.Protobuf.TestProtos {
       return new Uint64Message(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private ulong data_;
     public ulong Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value;
       }
     }
@@ -4552,19 +4292,11 @@ namespace Google.Protobuf.TestProtos {
       return new BoolMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int DataFieldNumber = 1;
     private bool data_;
     public bool Data {
       get { return data_; }
       set {
-        pb::Freezable.CheckMutable(this);
         data_ = value;
       }
     }
@@ -4680,19 +4412,10 @@ namespace Google.Protobuf.TestProtos {
       return new TestOneof(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (foo_ is IFreezable) ((IFreezable) foo_).Freeze();
-    }
-
     public const int FooIntFieldNumber = 1;
     public int FooInt {
       get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
       set {
-        pb::Freezable.CheckMutable(this);
         foo_ = value;
         fooCase_ = FooOneofCase.FooInt;
       }
@@ -4702,7 +4425,6 @@ namespace Google.Protobuf.TestProtos {
     public string FooString {
       get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
       set {
-        pb::Freezable.CheckMutable(this);
         foo_ = value ?? "";
         fooCase_ = FooOneofCase.FooString;
       }
@@ -4712,7 +4434,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.TestProtos.TestAllTypes FooMessage {
       get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.Protobuf.TestProtos.TestAllTypes) foo_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         foo_ = value;
         fooCase_ = value == null ? FooOneofCase.None : FooOneofCase.FooMessage;
       }
@@ -4731,7 +4452,6 @@ namespace Google.Protobuf.TestProtos {
     }
 
     public void ClearFoo() {
-      pb::Freezable.CheckMutable(this);
       fooCase_ = FooOneofCase.None;
       foo_ = null;
     }
@@ -4889,27 +4609,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestPackedTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      packedInt32_.Freeze();
-      packedInt64_.Freeze();
-      packedUint32_.Freeze();
-      packedUint64_.Freeze();
-      packedSint32_.Freeze();
-      packedSint64_.Freeze();
-      packedFixed32_.Freeze();
-      packedFixed64_.Freeze();
-      packedSfixed32_.Freeze();
-      packedSfixed64_.Freeze();
-      packedFloat_.Freeze();
-      packedDouble_.Freeze();
-      packedBool_.Freeze();
-      packedEnum_.Freeze();
-    }
-
     public const int PackedInt32FieldNumber = 90;
     private static readonly pb::FieldCodec<int> _repeated_packedInt32_codec
         = pb::FieldCodec.ForInt32(722);
@@ -5259,27 +4958,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestUnpackedTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      unpackedInt32_.Freeze();
-      unpackedInt64_.Freeze();
-      unpackedUint32_.Freeze();
-      unpackedUint64_.Freeze();
-      unpackedSint32_.Freeze();
-      unpackedSint64_.Freeze();
-      unpackedFixed32_.Freeze();
-      unpackedFixed64_.Freeze();
-      unpackedSfixed32_.Freeze();
-      unpackedSfixed64_.Freeze();
-      unpackedFloat_.Freeze();
-      unpackedDouble_.Freeze();
-      unpackedBool_.Freeze();
-      unpackedEnum_.Freeze();
-    }
-
     public const int UnpackedInt32FieldNumber = 90;
     private static readonly pb::FieldCodec<int> _repeated_unpackedInt32_codec
         = pb::FieldCodec.ForInt32(720);
@@ -5621,19 +5299,6 @@ namespace Google.Protobuf.TestProtos {
       return new TestRepeatedScalarDifferentTagSizes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      repeatedFixed32_.Freeze();
-      repeatedInt32_.Freeze();
-      repeatedFixed64_.Freeze();
-      repeatedInt64_.Freeze();
-      repeatedFloat_.Freeze();
-      repeatedUint64_.Freeze();
-    }
-
     public const int RepeatedFixed32FieldNumber = 12;
     private static readonly pb::FieldCodec<uint> _repeated_repeatedFixed32_codec
         = pb::FieldCodec.ForFixed32(98);
@@ -5826,19 +5491,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestCommentInjectionMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int AFieldNumber = 1;
     private string a_ = "";
     public string A {
       get { return a_; }
       set {
-        pb::Freezable.CheckMutable(this);
         a_ = value ?? "";
       }
     }
@@ -5942,13 +5599,6 @@ namespace Google.Protobuf.TestProtos {
       return new FooRequest(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as FooRequest);
     }
@@ -6032,13 +5682,6 @@ namespace Google.Protobuf.TestProtos {
       return new FooResponse(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as FooResponse);
     }
@@ -6122,13 +5765,6 @@ namespace Google.Protobuf.TestProtos {
       return new FooClientMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as FooClientMessage);
     }
@@ -6212,13 +5848,6 @@ namespace Google.Protobuf.TestProtos {
       return new FooServerMessage(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as FooServerMessage);
     }
@@ -6302,13 +5931,6 @@ namespace Google.Protobuf.TestProtos {
       return new BarRequest(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as BarRequest);
     }
@@ -6392,13 +6014,6 @@ namespace Google.Protobuf.TestProtos {
       return new BarResponse(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as BarResponse);
     }
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
index d9943dba..f938d70c 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
@@ -217,28 +217,11 @@ namespace Google.Protobuf.TestProtos {
       return new TestWellKnownTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (anyField_ != null) AnyField.Freeze();
-      if (apiField_ != null) ApiField.Freeze();
-      if (durationField_ != null) DurationField.Freeze();
-      if (emptyField_ != null) EmptyField.Freeze();
-      if (fieldMaskField_ != null) FieldMaskField.Freeze();
-      if (sourceContextField_ != null) SourceContextField.Freeze();
-      if (structField_ != null) StructField.Freeze();
-      if (timestampField_ != null) TimestampField.Freeze();
-      if (typeField_ != null) TypeField.Freeze();
-    }
-
     public const int AnyFieldFieldNumber = 1;
     private global::Google.Protobuf.WellKnownTypes.Any anyField_;
     public global::Google.Protobuf.WellKnownTypes.Any AnyField {
       get { return anyField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         anyField_ = value;
       }
     }
@@ -248,7 +231,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Api ApiField {
       get { return apiField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         apiField_ = value;
       }
     }
@@ -258,7 +240,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Duration DurationField {
       get { return durationField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         durationField_ = value;
       }
     }
@@ -268,7 +249,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Empty EmptyField {
       get { return emptyField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         emptyField_ = value;
       }
     }
@@ -278,7 +258,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.FieldMask FieldMaskField {
       get { return fieldMaskField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         fieldMaskField_ = value;
       }
     }
@@ -288,7 +267,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.SourceContext SourceContextField {
       get { return sourceContextField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sourceContextField_ = value;
       }
     }
@@ -298,7 +276,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Struct StructField {
       get { return structField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         structField_ = value;
       }
     }
@@ -308,7 +285,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Timestamp TimestampField {
       get { return timestampField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         timestampField_ = value;
       }
     }
@@ -318,7 +294,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Type TypeField {
       get { return typeField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         typeField_ = value;
       }
     }
@@ -329,7 +304,6 @@ namespace Google.Protobuf.TestProtos {
     public double? DoubleField {
       get { return doubleField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         doubleField_ = value;
       }
     }
@@ -340,7 +314,6 @@ namespace Google.Protobuf.TestProtos {
     public float? FloatField {
       get { return floatField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         floatField_ = value;
       }
     }
@@ -351,7 +324,6 @@ namespace Google.Protobuf.TestProtos {
     public long? Int64Field {
       get { return int64Field_; }
       set {
-        pb::Freezable.CheckMutable(this);
         int64Field_ = value;
       }
     }
@@ -362,7 +334,6 @@ namespace Google.Protobuf.TestProtos {
     public ulong? Uint64Field {
       get { return uint64Field_; }
       set {
-        pb::Freezable.CheckMutable(this);
         uint64Field_ = value;
       }
     }
@@ -373,7 +344,6 @@ namespace Google.Protobuf.TestProtos {
     public int? Int32Field {
       get { return int32Field_; }
       set {
-        pb::Freezable.CheckMutable(this);
         int32Field_ = value;
       }
     }
@@ -384,7 +354,6 @@ namespace Google.Protobuf.TestProtos {
     public uint? Uint32Field {
       get { return uint32Field_; }
       set {
-        pb::Freezable.CheckMutable(this);
         uint32Field_ = value;
       }
     }
@@ -395,7 +364,6 @@ namespace Google.Protobuf.TestProtos {
     public bool? BoolField {
       get { return boolField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         boolField_ = value;
       }
     }
@@ -406,7 +374,6 @@ namespace Google.Protobuf.TestProtos {
     public string StringField {
       get { return stringField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         stringField_ = value;
       }
     }
@@ -417,7 +384,6 @@ namespace Google.Protobuf.TestProtos {
     public pb::ByteString BytesField {
       get { return bytesField_; }
       set {
-        pb::Freezable.CheckMutable(this);
         bytesField_ = value;
       }
     }
@@ -901,31 +867,6 @@ namespace Google.Protobuf.TestProtos {
       return new RepeatedWellKnownTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      anyField_.Freeze();
-      apiField_.Freeze();
-      durationField_.Freeze();
-      emptyField_.Freeze();
-      fieldMaskField_.Freeze();
-      sourceContextField_.Freeze();
-      structField_.Freeze();
-      timestampField_.Freeze();
-      typeField_.Freeze();
-      doubleField_.Freeze();
-      floatField_.Freeze();
-      int64Field_.Freeze();
-      uint64Field_.Freeze();
-      int32Field_.Freeze();
-      uint32Field_.Freeze();
-      boolField_.Freeze();
-      stringField_.Freeze();
-      bytesField_.Freeze();
-    }
-
     public const int AnyFieldFieldNumber = 1;
     private static readonly pb::FieldCodec<global::Google.Protobuf.WellKnownTypes.Any> _repeated_anyField_codec
         = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.WellKnownTypes.Any.Parser);
@@ -1372,19 +1313,10 @@ namespace Google.Protobuf.TestProtos {
       return new OneofWellKnownTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (oneofField_ is IFreezable) ((IFreezable) oneofField_).Freeze();
-    }
-
     public const int AnyFieldFieldNumber = 1;
     public global::Google.Protobuf.WellKnownTypes.Any AnyField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.AnyField ? (global::Google.Protobuf.WellKnownTypes.Any) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.AnyField;
       }
@@ -1394,7 +1326,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Api ApiField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.ApiField ? (global::Google.Protobuf.WellKnownTypes.Api) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.ApiField;
       }
@@ -1404,7 +1335,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Duration DurationField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.DurationField ? (global::Google.Protobuf.WellKnownTypes.Duration) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.DurationField;
       }
@@ -1414,7 +1344,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Empty EmptyField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.EmptyField ? (global::Google.Protobuf.WellKnownTypes.Empty) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.EmptyField;
       }
@@ -1424,7 +1353,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.FieldMask FieldMaskField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.FieldMaskField ? (global::Google.Protobuf.WellKnownTypes.FieldMask) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.FieldMaskField;
       }
@@ -1434,7 +1362,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.SourceContext SourceContextField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.SourceContextField ? (global::Google.Protobuf.WellKnownTypes.SourceContext) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.SourceContextField;
       }
@@ -1444,7 +1371,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Struct StructField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.StructField ? (global::Google.Protobuf.WellKnownTypes.Struct) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.StructField;
       }
@@ -1454,7 +1380,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Timestamp TimestampField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.TimestampField ? (global::Google.Protobuf.WellKnownTypes.Timestamp) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.TimestampField;
       }
@@ -1464,7 +1389,6 @@ namespace Google.Protobuf.TestProtos {
     public global::Google.Protobuf.WellKnownTypes.Type TypeField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.TypeField ? (global::Google.Protobuf.WellKnownTypes.Type) oneofField_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.TypeField;
       }
@@ -1475,7 +1399,6 @@ namespace Google.Protobuf.TestProtos {
     public double? DoubleField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.DoubleField ? (double?) oneofField_ : (double?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.DoubleField;
       }
@@ -1486,7 +1409,6 @@ namespace Google.Protobuf.TestProtos {
     public float? FloatField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.FloatField ? (float?) oneofField_ : (float?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.FloatField;
       }
@@ -1497,7 +1419,6 @@ namespace Google.Protobuf.TestProtos {
     public long? Int64Field {
       get { return oneofFieldCase_ == OneofFieldOneofCase.Int64Field ? (long?) oneofField_ : (long?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.Int64Field;
       }
@@ -1508,7 +1429,6 @@ namespace Google.Protobuf.TestProtos {
     public ulong? Uint64Field {
       get { return oneofFieldCase_ == OneofFieldOneofCase.Uint64Field ? (ulong?) oneofField_ : (ulong?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.Uint64Field;
       }
@@ -1519,7 +1439,6 @@ namespace Google.Protobuf.TestProtos {
     public int? Int32Field {
       get { return oneofFieldCase_ == OneofFieldOneofCase.Int32Field ? (int?) oneofField_ : (int?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.Int32Field;
       }
@@ -1530,7 +1449,6 @@ namespace Google.Protobuf.TestProtos {
     public uint? Uint32Field {
       get { return oneofFieldCase_ == OneofFieldOneofCase.Uint32Field ? (uint?) oneofField_ : (uint?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.Uint32Field;
       }
@@ -1541,7 +1459,6 @@ namespace Google.Protobuf.TestProtos {
     public bool? BoolField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.BoolField ? (bool?) oneofField_ : (bool?) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.BoolField;
       }
@@ -1552,7 +1469,6 @@ namespace Google.Protobuf.TestProtos {
     public string StringField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.StringField ? (string) oneofField_ : (string) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.StringField;
       }
@@ -1563,7 +1479,6 @@ namespace Google.Protobuf.TestProtos {
     public pb::ByteString BytesField {
       get { return oneofFieldCase_ == OneofFieldOneofCase.BytesField ? (pb::ByteString) oneofField_ : (pb::ByteString) null; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofField_ = value;
         oneofFieldCase_ = value == null ? OneofFieldOneofCase.None : OneofFieldOneofCase.BytesField;
       }
@@ -1597,7 +1512,6 @@ namespace Google.Protobuf.TestProtos {
     }
 
     public void ClearOneofField() {
-      pb::Freezable.CheckMutable(this);
       oneofFieldCase_ = OneofFieldOneofCase.None;
       oneofField_ = null;
     }
@@ -2030,31 +1944,6 @@ namespace Google.Protobuf.TestProtos {
       return new MapWellKnownTypes(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      anyField_.Freeze();
-      apiField_.Freeze();
-      durationField_.Freeze();
-      emptyField_.Freeze();
-      fieldMaskField_.Freeze();
-      sourceContextField_.Freeze();
-      structField_.Freeze();
-      timestampField_.Freeze();
-      typeField_.Freeze();
-      doubleField_.Freeze();
-      floatField_.Freeze();
-      int64Field_.Freeze();
-      uint64Field_.Freeze();
-      int32Field_.Freeze();
-      uint32Field_.Freeze();
-      boolField_.Freeze();
-      stringField_.Freeze();
-      bytesField_.Freeze();
-    }
-
     public const int AnyFieldFieldNumber = 1;
     private static readonly pbc::MapField<int, global::Google.Protobuf.WellKnownTypes.Any>.Codec _map_anyField_codec
         = new pbc::MapField<int, global::Google.Protobuf.WellKnownTypes.Any>.Codec(pb::FieldCodec.ForInt32(8), pb::FieldCodec.ForMessage(18, global::Google.Protobuf.WellKnownTypes.Any.Parser), 10);
diff --git a/csharp/src/Google.Protobuf/Collections/MapField.cs b/csharp/src/Google.Protobuf/Collections/MapField.cs
index 68f2f1cc..0f7227c2 100644
--- a/csharp/src/Google.Protobuf/Collections/MapField.cs
+++ b/csharp/src/Google.Protobuf/Collections/MapField.cs
@@ -50,7 +50,7 @@ namespace Google.Protobuf.Collections
     /// </remarks>
     /// <typeparam name="TKey">Key type in the map. Must be a type supported by Protocol Buffer map keys.</typeparam>
     /// <typeparam name="TValue">Value type in the map. Must be a type supported by Protocol Buffers.</typeparam>
-    public sealed class MapField<TKey, TValue> : IDeepCloneable<MapField<TKey, TValue>>, IFreezable, IDictionary<TKey, TValue>, IEquatable<MapField<TKey, TValue>>, IDictionary
+    public sealed class MapField<TKey, TValue> : IDeepCloneable<MapField<TKey, TValue>>, IDictionary<TKey, TValue>, IEquatable<MapField<TKey, TValue>>, IDictionary
     {
         // TODO: Don't create the map/list until we have an entry. (Assume many maps will be empty.)
         private readonly bool allowNullValues;
@@ -119,7 +119,6 @@ namespace Google.Protobuf.Collections
 
         public bool Remove(TKey key)
         {
-            this.CheckMutable();
             ThrowHelper.ThrowIfNull(key, "key");
             LinkedListNode<KeyValuePair<TKey, TValue>> node;
             if (map.TryGetValue(key, out node))
@@ -169,7 +168,6 @@ namespace Google.Protobuf.Collections
                 {
                     ThrowHelper.ThrowIfNull(value, "value");
                 }
-                this.CheckMutable();
                 LinkedListNode<KeyValuePair<TKey, TValue>> node;
                 var pair = new KeyValuePair<TKey, TValue>(key, value);
                 if (map.TryGetValue(key, out node))
@@ -214,7 +212,6 @@ namespace Google.Protobuf.Collections
 
         public void Clear()
         {
-            this.CheckMutable();
             list.Clear();
             map.Clear();
         }
@@ -233,7 +230,6 @@ namespace Google.Protobuf.Collections
 
         bool ICollection<KeyValuePair<TKey, TValue>>.Remove(KeyValuePair<TKey, TValue> item)
         {
-            this.CheckMutable();
             if (item.Key == null)
             {
                 throw new ArgumentException("Key is null", "item");
@@ -260,31 +256,6 @@ namespace Google.Protobuf.Collections
         public int Count { get { return list.Count; } }
         public bool IsReadOnly { get { return frozen; } }
 
-        public void Freeze()
-        {
-            if (IsFrozen)
-            {
-                return;
-            }
-            frozen = true;
-            // Only values can be frozen, as all the key types are simple.
-            // Everything can be done in-place, as we're just freezing objects.
-            if (typeof(IFreezable).IsAssignableFrom(typeof(TValue)))
-            {
-                for (var node = list.First; node != null; node = node.Next)
-                {
-                    var pair = node.Value;
-                    IFreezable freezableValue = pair.Value as IFreezable;
-                    if (freezableValue != null)
-                    {
-                        freezableValue.Freeze();
-                    }
-                }
-            }
-        }
-
-        public bool IsFrozen { get { return frozen; } }
-
         public override bool Equals(object other)
         {
             return Equals(other as MapField<TKey, TValue>);
@@ -405,7 +376,6 @@ namespace Google.Protobuf.Collections
         void IDictionary.Remove(object key)
         {
             ThrowHelper.ThrowIfNull(key, "key");
-            this.CheckMutable();
             if (!(key is TKey))
             {
                 return;
@@ -420,7 +390,7 @@ namespace Google.Protobuf.Collections
             temp.CopyTo(array, index);
         }
 
-        bool IDictionary.IsFixedSize { get { return IsFrozen; } }
+        bool IDictionary.IsFixedSize { get { return false; } }
 
         ICollection IDictionary.Keys { get { return (ICollection)Keys; } }
 
diff --git a/csharp/src/Google.Protobuf/Collections/RepeatedField.cs b/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
index ccd1a9bb..e7fc0a3f 100644
--- a/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
+++ b/csharp/src/Google.Protobuf/Collections/RepeatedField.cs
@@ -43,7 +43,7 @@ namespace Google.Protobuf.Collections
     /// restrictions (no null values) and capabilities (deep cloning and freezing).
     /// </summary>
     /// <typeparam name="T">The element type of the repeated field.</typeparam>
-    public sealed class RepeatedField<T> : IList<T>, IList, IDeepCloneable<RepeatedField<T>>, IEquatable<RepeatedField<T>>, IFreezable
+    public sealed class RepeatedField<T> : IList<T>, IList, IDeepCloneable<RepeatedField<T>>, IEquatable<RepeatedField<T>>
     {
         private static readonly T[] EmptyArray = new T[0];
         private const int MinArraySize = 8;
@@ -190,21 +190,6 @@ namespace Google.Protobuf.Collections
             }
         }
 
-        public bool IsFrozen { get { return frozen; } }
-
-        public void Freeze()
-        {
-            frozen = true;
-            IFreezable[] freezableArray = array as IFreezable[];
-            if (freezableArray != null)
-            {
-                for (int i = 0; i < count; i++)
-                {
-                    freezableArray[i].Freeze();
-                }
-            }
-        }
-
         private void EnsureSize(int size)
         {
             if (array.Length < size)
@@ -223,14 +208,12 @@ namespace Google.Protobuf.Collections
             {
                 throw new ArgumentNullException("item");
             }
-            this.CheckMutable();
             EnsureSize(count + 1);
             array[count++] = item;
         }
 
         public void Clear()
         {
-            this.CheckMutable();
             array = EmptyArray;
             count = 0;
         }
@@ -247,7 +230,6 @@ namespace Google.Protobuf.Collections
 
         public bool Remove(T item)
         {
-            this.CheckMutable();
             int index = IndexOf(item);
             if (index == -1)
             {
@@ -261,7 +243,7 @@ namespace Google.Protobuf.Collections
 
         public int Count { get { return count; } }
 
-        public bool IsReadOnly { get { return IsFrozen; } }
+        public bool IsReadOnly { get { return false; } }
 
         public void Add(RepeatedField<T> values)
         {
@@ -269,7 +251,6 @@ namespace Google.Protobuf.Collections
             {
                 throw new ArgumentNullException("values");
             }
-            this.CheckMutable();
             EnsureSize(count + values.count);
             // We know that all the values will be valid, because it's a RepeatedField.
             Array.Copy(values.array, 0, array, count, values.count);
@@ -282,7 +263,6 @@ namespace Google.Protobuf.Collections
             {
                 throw new ArgumentNullException("values");
             }
-            this.CheckMutable();
             // TODO: Check for ICollection and get the Count?
             foreach (T item in values)
             {
@@ -372,7 +352,6 @@ namespace Google.Protobuf.Collections
             {
                 throw new ArgumentOutOfRangeException("index");
             }
-            this.CheckMutable();
             EnsureSize(count + 1);
             Array.Copy(array, index, array, index + 1, count - index);
             array[index] = item;
@@ -385,7 +364,6 @@ namespace Google.Protobuf.Collections
             {
                 throw new ArgumentOutOfRangeException("index");
             }
-            this.CheckMutable();
             Array.Copy(array, index + 1, array, index, count - index - 1);
             count--;
             array[count] = default(T);
@@ -407,7 +385,6 @@ namespace Google.Protobuf.Collections
                 {
                     throw new ArgumentOutOfRangeException("index");
                 }
-                this.CheckMutable();
                 if (value == null)
                 {
                     throw new ArgumentNullException("value");
@@ -417,7 +394,7 @@ namespace Google.Protobuf.Collections
         }
 
         #region Explicit interface implementation for IList and ICollection.
-        bool IList.IsFixedSize { get { return IsFrozen; } }
+        bool IList.IsFixedSize { get { return false; } }
 
         void ICollection.CopyTo(Array array, int index)
         {
diff --git a/csharp/src/Google.Protobuf/Freezable.cs b/csharp/src/Google.Protobuf/Freezable.cs
deleted file mode 100644
index d16e1b42..00000000
--- a/csharp/src/Google.Protobuf/Freezable.cs
+++ /dev/null
@@ -1,58 +0,0 @@
-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-
-namespace Google.Protobuf
-{
-    /// <summary>
-    /// Extension methods for <see cref="IFreezable"/> types.
-    /// </summary>
-    public static class Freezable
-    {
-        /// <summary>
-        /// Throws an <see cref="InvalidOperationException"/> if <paramref name="target"/>
-        /// is frozen.
-        /// </summary>
-        /// <remarks>
-        /// This is a convenience methods that freezable types can call before all
-        /// mutations, to protect frozen objects.
-        /// </remarks>
-        public static void CheckMutable(this IFreezable target)
-        {
-            if (target.IsFrozen)
-            {
-                throw new InvalidOperationException("Attempt to mutate frozen object");
-            }
-        }
-    }
-}
diff --git a/csharp/src/Google.Protobuf/Google.Protobuf.csproj b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
index b1f20816..b141e434 100644
--- a/csharp/src/Google.Protobuf/Google.Protobuf.csproj
+++ b/csharp/src/Google.Protobuf/Google.Protobuf.csproj
@@ -64,7 +64,6 @@
     <Compile Include="Compatibility\TypeExtensions.cs" />

     <Compile Include="FieldCodec.cs" />

     <Compile Include="FrameworkPortability.cs" />

-    <Compile Include="Freezable.cs" />

     <Compile Include="JsonFormatter.cs" />

     <Compile Include="MessageExtensions.cs" />

     <Compile Include="IMessage.cs" />

diff --git a/csharp/src/Google.Protobuf/IMessage.cs b/csharp/src/Google.Protobuf/IMessage.cs
index d179c386..60c6f8c3 100644
--- a/csharp/src/Google.Protobuf/IMessage.cs
+++ b/csharp/src/Google.Protobuf/IMessage.cs
@@ -79,7 +79,7 @@ namespace Google.Protobuf
     /// the implementation class.

     /// </summary>

     /// <typeparam name="T">The message type.</typeparam>

-    public interface IMessage<T> : IMessage, IEquatable<T>, IDeepCloneable<T>, IFreezable where T : IMessage<T>

+    public interface IMessage<T> : IMessage, IEquatable<T>, IDeepCloneable<T> where T : IMessage<T>

     {

         /// <summary>

         /// Merges the given message into this one.

@@ -97,10 +97,6 @@ namespace Google.Protobuf
     /// Additionally, due to the type constraint on <c>T</c> in <see cref="IMessage{T}"/>,

     /// it is simpler to keep this as a separate interface.

     /// </para>

-    /// <para>

-    /// Freezable types which implement this interface should always return a mutable clone,

-    /// even if the original object is frozen.

-    /// </para>

     /// </remarks>

     /// <typeparam name="T">The type itself, returned by the <see cref="Clone"/> method.</typeparam>

     public interface IDeepCloneable<T>

@@ -111,32 +107,4 @@ namespace Google.Protobuf
         /// <returns>A deep clone of this object.</returns>

         T Clone();

     }

-

-    /// <summary>

-    /// Provides a mechanism for freezing a message (or repeated field collection)

-    /// to make it immutable.

-    /// </summary>

-    /// <remarks>

-    /// Implementations are under no obligation to make this thread-safe: if a freezable

-    /// type instance is shared between threads before being frozen, and one thread then

-    /// freezes it, it is possible for other threads to make changes during the freezing

-    /// operation and also to observe stale values for mutated fields. Objects should be

-    /// frozen before being made available to other threads.

-    /// </remarks>

-    public interface IFreezable

-    {

-        /// <summary>

-        /// Freezes this object.

-        /// </summary>

-        /// <remarks>

-        /// If the object is already frozen, this method has no effect.

-        /// </remarks>

-        void Freeze();

-

-        /// <summary>

-        /// Returns whether or not this object is frozen (and therefore immutable).

-        /// </summary>

-        /// <value><c>true</c> if this object is frozen; <c>false</c> otherwise.</value>

-        bool IsFrozen { get; }

-    }

 }

diff --git a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
index def70b53..6f55f5ab 100644
--- a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
+++ b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
@@ -190,14 +190,6 @@ namespace Google.Protobuf.Reflection {
       return new FileDescriptorSet(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      file_.Freeze();
-    }
-
     public const int FileFieldNumber = 1;
     private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.FileDescriptorProto> _repeated_file_codec
         = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.Reflection.FileDescriptorProto.Parser);
@@ -310,28 +302,11 @@ namespace Google.Protobuf.Reflection {
       return new FileDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      dependency_.Freeze();
-      publicDependency_.Freeze();
-      weakDependency_.Freeze();
-      messageType_.Freeze();
-      enumType_.Freeze();
-      service_.Freeze();
-      extension_.Freeze();
-      if (options_ != null) Options.Freeze();
-      if (sourceCodeInfo_ != null) SourceCodeInfo.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -341,7 +316,6 @@ namespace Google.Protobuf.Reflection {
     internal string Package {
       get { return package_; }
       set {
-        pb::Freezable.CheckMutable(this);
         package_ = value ?? "";
       }
     }
@@ -407,7 +381,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FileOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -417,7 +390,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.SourceCodeInfo SourceCodeInfo {
       get { return sourceCodeInfo_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sourceCodeInfo_ = value;
       }
     }
@@ -427,7 +399,6 @@ namespace Google.Protobuf.Reflection {
     internal string Syntax {
       get { return syntax_; }
       set {
-        pb::Freezable.CheckMutable(this);
         syntax_ = value ?? "";
       }
     }
@@ -682,28 +653,11 @@ namespace Google.Protobuf.Reflection {
       return new DescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      field_.Freeze();
-      extension_.Freeze();
-      nestedType_.Freeze();
-      enumType_.Freeze();
-      extensionRange_.Freeze();
-      oneofDecl_.Freeze();
-      if (options_ != null) Options.Freeze();
-      reservedRange_.Freeze();
-      reservedName_.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -761,7 +715,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.MessageOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -978,19 +931,11 @@ namespace Google.Protobuf.Reflection {
           return new ExtensionRange(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int StartFieldNumber = 1;
         private int start_;
         internal int Start {
           get { return start_; }
           set {
-            pb::Freezable.CheckMutable(this);
             start_ = value;
           }
         }
@@ -1000,7 +945,6 @@ namespace Google.Protobuf.Reflection {
         internal int End {
           get { return end_; }
           set {
-            pb::Freezable.CheckMutable(this);
             end_ = value;
           }
         }
@@ -1122,19 +1066,11 @@ namespace Google.Protobuf.Reflection {
           return new ReservedRange(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int StartFieldNumber = 1;
         private int start_;
         internal int Start {
           get { return start_; }
           set {
-            pb::Freezable.CheckMutable(this);
             start_ = value;
           }
         }
@@ -1144,7 +1080,6 @@ namespace Google.Protobuf.Reflection {
         internal int End {
           get { return end_; }
           set {
-            pb::Freezable.CheckMutable(this);
             end_ = value;
           }
         }
@@ -1278,20 +1213,11 @@ namespace Google.Protobuf.Reflection {
       return new FieldDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (options_ != null) Options.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -1301,7 +1227,6 @@ namespace Google.Protobuf.Reflection {
     internal int Number {
       get { return number_; }
       set {
-        pb::Freezable.CheckMutable(this);
         number_ = value;
       }
     }
@@ -1311,7 +1236,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FieldDescriptorProto.Types.Label Label {
       get { return label_; }
       set {
-        pb::Freezable.CheckMutable(this);
         label_ = value;
       }
     }
@@ -1321,7 +1245,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FieldDescriptorProto.Types.Type Type {
       get { return type_; }
       set {
-        pb::Freezable.CheckMutable(this);
         type_ = value;
       }
     }
@@ -1331,7 +1254,6 @@ namespace Google.Protobuf.Reflection {
     internal string TypeName {
       get { return typeName_; }
       set {
-        pb::Freezable.CheckMutable(this);
         typeName_ = value ?? "";
       }
     }
@@ -1341,7 +1263,6 @@ namespace Google.Protobuf.Reflection {
     internal string Extendee {
       get { return extendee_; }
       set {
-        pb::Freezable.CheckMutable(this);
         extendee_ = value ?? "";
       }
     }
@@ -1351,7 +1272,6 @@ namespace Google.Protobuf.Reflection {
     internal string DefaultValue {
       get { return defaultValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         defaultValue_ = value ?? "";
       }
     }
@@ -1361,7 +1281,6 @@ namespace Google.Protobuf.Reflection {
     internal int OneofIndex {
       get { return oneofIndex_; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofIndex_ = value;
       }
     }
@@ -1371,7 +1290,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FieldOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -1643,19 +1561,11 @@ namespace Google.Protobuf.Reflection {
       return new OneofDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -1762,21 +1672,11 @@ namespace Google.Protobuf.Reflection {
       return new EnumDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      value_.Freeze();
-      if (options_ != null) Options.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -1794,7 +1694,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.EnumOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -1932,20 +1831,11 @@ namespace Google.Protobuf.Reflection {
       return new EnumValueDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (options_ != null) Options.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -1955,7 +1845,6 @@ namespace Google.Protobuf.Reflection {
     internal int Number {
       get { return number_; }
       set {
-        pb::Freezable.CheckMutable(this);
         number_ = value;
       }
     }
@@ -1965,7 +1854,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.EnumValueOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -2110,21 +1998,11 @@ namespace Google.Protobuf.Reflection {
       return new ServiceDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      method_.Freeze();
-      if (options_ != null) Options.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -2142,7 +2020,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.ServiceOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -2283,20 +2160,11 @@ namespace Google.Protobuf.Reflection {
       return new MethodDescriptorProto(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (options_ != null) Options.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     internal string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -2306,7 +2174,6 @@ namespace Google.Protobuf.Reflection {
     internal string InputType {
       get { return inputType_; }
       set {
-        pb::Freezable.CheckMutable(this);
         inputType_ = value ?? "";
       }
     }
@@ -2316,7 +2183,6 @@ namespace Google.Protobuf.Reflection {
     internal string OutputType {
       get { return outputType_; }
       set {
-        pb::Freezable.CheckMutable(this);
         outputType_ = value ?? "";
       }
     }
@@ -2326,7 +2192,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.MethodOptions Options {
       get { return options_; }
       set {
-        pb::Freezable.CheckMutable(this);
         options_ = value;
       }
     }
@@ -2336,7 +2201,6 @@ namespace Google.Protobuf.Reflection {
     internal bool ClientStreaming {
       get { return clientStreaming_; }
       set {
-        pb::Freezable.CheckMutable(this);
         clientStreaming_ = value;
       }
     }
@@ -2346,7 +2210,6 @@ namespace Google.Protobuf.Reflection {
     internal bool ServerStreaming {
       get { return serverStreaming_; }
       set {
-        pb::Freezable.CheckMutable(this);
         serverStreaming_ = value;
       }
     }
@@ -2551,20 +2414,11 @@ namespace Google.Protobuf.Reflection {
       return new FileOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int JavaPackageFieldNumber = 1;
     private string javaPackage_ = "";
     internal string JavaPackage {
       get { return javaPackage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaPackage_ = value ?? "";
       }
     }
@@ -2574,7 +2428,6 @@ namespace Google.Protobuf.Reflection {
     internal string JavaOuterClassname {
       get { return javaOuterClassname_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaOuterClassname_ = value ?? "";
       }
     }
@@ -2584,7 +2437,6 @@ namespace Google.Protobuf.Reflection {
     internal bool JavaMultipleFiles {
       get { return javaMultipleFiles_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaMultipleFiles_ = value;
       }
     }
@@ -2594,7 +2446,6 @@ namespace Google.Protobuf.Reflection {
     internal bool JavaGenerateEqualsAndHash {
       get { return javaGenerateEqualsAndHash_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaGenerateEqualsAndHash_ = value;
       }
     }
@@ -2604,7 +2455,6 @@ namespace Google.Protobuf.Reflection {
     internal bool JavaStringCheckUtf8 {
       get { return javaStringCheckUtf8_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaStringCheckUtf8_ = value;
       }
     }
@@ -2614,7 +2464,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FileOptions.Types.OptimizeMode OptimizeFor {
       get { return optimizeFor_; }
       set {
-        pb::Freezable.CheckMutable(this);
         optimizeFor_ = value;
       }
     }
@@ -2624,7 +2473,6 @@ namespace Google.Protobuf.Reflection {
     internal string GoPackage {
       get { return goPackage_; }
       set {
-        pb::Freezable.CheckMutable(this);
         goPackage_ = value ?? "";
       }
     }
@@ -2634,7 +2482,6 @@ namespace Google.Protobuf.Reflection {
     internal bool CcGenericServices {
       get { return ccGenericServices_; }
       set {
-        pb::Freezable.CheckMutable(this);
         ccGenericServices_ = value;
       }
     }
@@ -2644,7 +2491,6 @@ namespace Google.Protobuf.Reflection {
     internal bool JavaGenericServices {
       get { return javaGenericServices_; }
       set {
-        pb::Freezable.CheckMutable(this);
         javaGenericServices_ = value;
       }
     }
@@ -2654,7 +2500,6 @@ namespace Google.Protobuf.Reflection {
     internal bool PyGenericServices {
       get { return pyGenericServices_; }
       set {
-        pb::Freezable.CheckMutable(this);
         pyGenericServices_ = value;
       }
     }
@@ -2664,7 +2509,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -2674,7 +2518,6 @@ namespace Google.Protobuf.Reflection {
     internal bool CcEnableArenas {
       get { return ccEnableArenas_; }
       set {
-        pb::Freezable.CheckMutable(this);
         ccEnableArenas_ = value;
       }
     }
@@ -2684,7 +2527,6 @@ namespace Google.Protobuf.Reflection {
     internal string ObjcClassPrefix {
       get { return objcClassPrefix_; }
       set {
-        pb::Freezable.CheckMutable(this);
         objcClassPrefix_ = value ?? "";
       }
     }
@@ -2694,7 +2536,6 @@ namespace Google.Protobuf.Reflection {
     internal string CsharpNamespace {
       get { return csharpNamespace_; }
       set {
-        pb::Freezable.CheckMutable(this);
         csharpNamespace_ = value ?? "";
       }
     }
@@ -3040,20 +2881,11 @@ namespace Google.Protobuf.Reflection {
       return new MessageOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int MessageSetWireFormatFieldNumber = 1;
     private bool messageSetWireFormat_;
     internal bool MessageSetWireFormat {
       get { return messageSetWireFormat_; }
       set {
-        pb::Freezable.CheckMutable(this);
         messageSetWireFormat_ = value;
       }
     }
@@ -3063,7 +2895,6 @@ namespace Google.Protobuf.Reflection {
     internal bool NoStandardDescriptorAccessor {
       get { return noStandardDescriptorAccessor_; }
       set {
-        pb::Freezable.CheckMutable(this);
         noStandardDescriptorAccessor_ = value;
       }
     }
@@ -3073,7 +2904,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -3083,7 +2913,6 @@ namespace Google.Protobuf.Reflection {
     internal bool MapEntry {
       get { return mapEntry_; }
       set {
-        pb::Freezable.CheckMutable(this);
         mapEntry_ = value;
       }
     }
@@ -3259,20 +3088,11 @@ namespace Google.Protobuf.Reflection {
       return new FieldOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int CtypeFieldNumber = 1;
     private global::Google.Protobuf.Reflection.FieldOptions.Types.CType ctype_ = global::Google.Protobuf.Reflection.FieldOptions.Types.CType.STRING;
     internal global::Google.Protobuf.Reflection.FieldOptions.Types.CType Ctype {
       get { return ctype_; }
       set {
-        pb::Freezable.CheckMutable(this);
         ctype_ = value;
       }
     }
@@ -3282,7 +3102,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Packed {
       get { return packed_; }
       set {
-        pb::Freezable.CheckMutable(this);
         packed_ = value;
       }
     }
@@ -3292,7 +3111,6 @@ namespace Google.Protobuf.Reflection {
     internal global::Google.Protobuf.Reflection.FieldOptions.Types.JSType Jstype {
       get { return jstype_; }
       set {
-        pb::Freezable.CheckMutable(this);
         jstype_ = value;
       }
     }
@@ -3302,7 +3120,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Lazy {
       get { return lazy_; }
       set {
-        pb::Freezable.CheckMutable(this);
         lazy_ = value;
       }
     }
@@ -3312,7 +3129,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -3322,7 +3138,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Weak {
       get { return weak_; }
       set {
-        pb::Freezable.CheckMutable(this);
         weak_ = value;
       }
     }
@@ -3544,20 +3359,11 @@ namespace Google.Protobuf.Reflection {
       return new EnumOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int AllowAliasFieldNumber = 2;
     private bool allowAlias_;
     internal bool AllowAlias {
       get { return allowAlias_; }
       set {
-        pb::Freezable.CheckMutable(this);
         allowAlias_ = value;
       }
     }
@@ -3567,7 +3373,6 @@ namespace Google.Protobuf.Reflection {
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -3706,20 +3511,11 @@ namespace Google.Protobuf.Reflection {
       return new EnumValueOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int DeprecatedFieldNumber = 1;
     private bool deprecated_;
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -3842,20 +3638,11 @@ namespace Google.Protobuf.Reflection {
       return new ServiceOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int DeprecatedFieldNumber = 33;
     private bool deprecated_;
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -3978,20 +3765,11 @@ namespace Google.Protobuf.Reflection {
       return new MethodOptions(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      uninterpretedOption_.Freeze();
-    }
-
     public const int DeprecatedFieldNumber = 33;
     private bool deprecated_;
     internal bool Deprecated {
       get { return deprecated_; }
       set {
-        pb::Freezable.CheckMutable(this);
         deprecated_ = value;
       }
     }
@@ -4119,14 +3897,6 @@ namespace Google.Protobuf.Reflection {
       return new UninterpretedOption(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      name_.Freeze();
-    }
-
     public const int NameFieldNumber = 2;
     private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.UninterpretedOption.Types.NamePart> _repeated_name_codec
         = pb::FieldCodec.ForMessage(18, global::Google.Protobuf.Reflection.UninterpretedOption.Types.NamePart.Parser);
@@ -4140,7 +3910,6 @@ namespace Google.Protobuf.Reflection {
     internal string IdentifierValue {
       get { return identifierValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         identifierValue_ = value ?? "";
       }
     }
@@ -4150,7 +3919,6 @@ namespace Google.Protobuf.Reflection {
     internal ulong PositiveIntValue {
       get { return positiveIntValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         positiveIntValue_ = value;
       }
     }
@@ -4160,7 +3928,6 @@ namespace Google.Protobuf.Reflection {
     internal long NegativeIntValue {
       get { return negativeIntValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         negativeIntValue_ = value;
       }
     }
@@ -4170,7 +3937,6 @@ namespace Google.Protobuf.Reflection {
     internal double DoubleValue {
       get { return doubleValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         doubleValue_ = value;
       }
     }
@@ -4180,7 +3946,6 @@ namespace Google.Protobuf.Reflection {
     internal pb::ByteString StringValue {
       get { return stringValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         stringValue_ = value ?? pb::ByteString.Empty;
       }
     }
@@ -4190,7 +3955,6 @@ namespace Google.Protobuf.Reflection {
     internal string AggregateValue {
       get { return aggregateValue_; }
       set {
-        pb::Freezable.CheckMutable(this);
         aggregateValue_ = value ?? "";
       }
     }
@@ -4386,19 +4150,11 @@ namespace Google.Protobuf.Reflection {
           return new NamePart(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-        }
-
         public const int NamePart_FieldNumber = 1;
         private string namePart_ = "";
         internal string NamePart_ {
           get { return namePart_; }
           set {
-            pb::Freezable.CheckMutable(this);
             namePart_ = value ?? "";
           }
         }
@@ -4408,7 +4164,6 @@ namespace Google.Protobuf.Reflection {
         internal bool IsExtension {
           get { return isExtension_; }
           set {
-            pb::Freezable.CheckMutable(this);
             isExtension_ = value;
           }
         }
@@ -4534,14 +4289,6 @@ namespace Google.Protobuf.Reflection {
       return new SourceCodeInfo(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      location_.Freeze();
-    }
-
     public const int LocationFieldNumber = 1;
     private static readonly pb::FieldCodec<global::Google.Protobuf.Reflection.SourceCodeInfo.Types.Location> _repeated_location_codec
         = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.Reflection.SourceCodeInfo.Types.Location.Parser);
@@ -4648,16 +4395,6 @@ namespace Google.Protobuf.Reflection {
           return new Location(this);
         }
 
-        public void Freeze() {
-          if (IsFrozen) {
-            return;
-          }
-          _frozen = true;
-          path_.Freeze();
-          span_.Freeze();
-          leadingDetachedComments_.Freeze();
-        }
-
         public const int PathFieldNumber = 1;
         private static readonly pb::FieldCodec<int> _repeated_path_codec
             = pb::FieldCodec.ForInt32(10);
@@ -4679,7 +4416,6 @@ namespace Google.Protobuf.Reflection {
         internal string LeadingComments {
           get { return leadingComments_; }
           set {
-            pb::Freezable.CheckMutable(this);
             leadingComments_ = value ?? "";
           }
         }
@@ -4689,7 +4425,6 @@ namespace Google.Protobuf.Reflection {
         internal string TrailingComments {
           get { return trailingComments_; }
           set {
-            pb::Freezable.CheckMutable(this);
             trailingComments_ = value ?? "";
           }
         }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
index d92f148d..7882b991 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
@@ -69,19 +69,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Any(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int TypeUrlFieldNumber = 1;
     private string typeUrl_ = "";
     public string TypeUrl {
       get { return typeUrl_; }
       set {
-        pb::Freezable.CheckMutable(this);
         typeUrl_ = value ?? "";
       }
     }
@@ -91,7 +83,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public pb::ByteString Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value ?? pb::ByteString.Empty;
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
index e0a9e276..a066fd51 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
@@ -82,22 +82,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Api(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      methods_.Freeze();
-      options_.Freeze();
-      if (sourceContext_ != null) SourceContext.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -123,7 +112,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string Version {
       get { return version_; }
       set {
-        pb::Freezable.CheckMutable(this);
         version_ = value ?? "";
       }
     }
@@ -133,7 +121,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.SourceContext SourceContext {
       get { return sourceContext_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sourceContext_ = value;
       }
     }
@@ -299,20 +286,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Method(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      options_.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -322,7 +300,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string RequestTypeUrl {
       get { return requestTypeUrl_; }
       set {
-        pb::Freezable.CheckMutable(this);
         requestTypeUrl_ = value ?? "";
       }
     }
@@ -332,7 +309,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public bool RequestStreaming {
       get { return requestStreaming_; }
       set {
-        pb::Freezable.CheckMutable(this);
         requestStreaming_ = value;
       }
     }
@@ -342,7 +318,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string ResponseTypeUrl {
       get { return responseTypeUrl_; }
       set {
-        pb::Freezable.CheckMutable(this);
         responseTypeUrl_ = value ?? "";
       }
     }
@@ -352,7 +327,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public bool ResponseStreaming {
       get { return responseStreaming_; }
       set {
-        pb::Freezable.CheckMutable(this);
         responseStreaming_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
index 487911a7..3c43d634 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
@@ -70,19 +70,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Duration(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int SecondsFieldNumber = 1;
     private long seconds_;
     public long Seconds {
       get { return seconds_; }
       set {
-        pb::Freezable.CheckMutable(this);
         seconds_ = value;
       }
     }
@@ -92,7 +84,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public int Nanos {
       get { return nanos_; }
       set {
-        pb::Freezable.CheckMutable(this);
         nanos_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
index c9048b58..f3104409 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
@@ -67,13 +67,6 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Empty(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public override bool Equals(object other) {
       return Equals(other as Empty);
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
index 39d1c1f5..c090aae8 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
@@ -68,14 +68,6 @@ namespace Google.Protobuf.WellKnownTypes {
       return new FieldMask(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      paths_.Freeze();
-    }
-
     public const int PathsFieldNumber = 1;
     private static readonly pb::FieldCodec<string> _repeated_paths_codec
         = pb::FieldCodec.ForString(10);
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
index 8bce86d4..73874cf1 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
@@ -69,19 +69,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new SourceContext(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int FileNameFieldNumber = 1;
     private string fileName_ = "";
     public string FileName {
       get { return fileName_; }
       set {
-        pb::Freezable.CheckMutable(this);
         fileName_ = value ?? "";
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
index a2452c17..bb2e5c1b 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
@@ -87,14 +87,6 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Struct(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      fields_.Freeze();
-    }
-
     public const int FieldsFieldNumber = 1;
     private static readonly pbc::MapField<string, global::Google.Protobuf.WellKnownTypes.Value>.Codec _map_fields_codec
         = new pbc::MapField<string, global::Google.Protobuf.WellKnownTypes.Value>.Codec(pb::FieldCodec.ForString(10), pb::FieldCodec.ForMessage(18, global::Google.Protobuf.WellKnownTypes.Value.Parser), 10);
@@ -216,19 +208,10 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Value(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (kind_ is IFreezable) ((IFreezable) kind_).Freeze();
-    }
-
     public const int NullValueFieldNumber = 1;
     public global::Google.Protobuf.WellKnownTypes.NullValue NullValue {
       get { return kindCase_ == KindOneofCase.NullValue ? (global::Google.Protobuf.WellKnownTypes.NullValue) kind_ : global::Google.Protobuf.WellKnownTypes.NullValue.NULL_VALUE; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
         kindCase_ = KindOneofCase.NullValue;
       }
@@ -238,7 +221,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public double NumberValue {
       get { return kindCase_ == KindOneofCase.NumberValue ? (double) kind_ : 0D; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
         kindCase_ = KindOneofCase.NumberValue;
       }
@@ -248,7 +230,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string StringValue {
       get { return kindCase_ == KindOneofCase.StringValue ? (string) kind_ : ""; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value ?? "";
         kindCase_ = KindOneofCase.StringValue;
       }
@@ -258,7 +239,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public bool BoolValue {
       get { return kindCase_ == KindOneofCase.BoolValue ? (bool) kind_ : false; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
         kindCase_ = KindOneofCase.BoolValue;
       }
@@ -268,7 +248,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.Struct StructValue {
       get { return kindCase_ == KindOneofCase.StructValue ? (global::Google.Protobuf.WellKnownTypes.Struct) kind_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
         kindCase_ = value == null ? KindOneofCase.None : KindOneofCase.StructValue;
       }
@@ -278,7 +257,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.ListValue ListValue {
       get { return kindCase_ == KindOneofCase.ListValue ? (global::Google.Protobuf.WellKnownTypes.ListValue) kind_ : null; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
         kindCase_ = value == null ? KindOneofCase.None : KindOneofCase.ListValue;
       }
@@ -300,7 +278,6 @@ namespace Google.Protobuf.WellKnownTypes {
     }
 
     public void ClearKind() {
-      pb::Freezable.CheckMutable(this);
       kindCase_ = KindOneofCase.None;
       kind_ = null;
     }
@@ -499,14 +476,6 @@ namespace Google.Protobuf.WellKnownTypes {
       return new ListValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      values_.Freeze();
-    }
-
     public const int ValuesFieldNumber = 1;
     private static readonly pb::FieldCodec<global::Google.Protobuf.WellKnownTypes.Value> _repeated_values_codec
         = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.WellKnownTypes.Value.Parser);
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
index f874065b..f66b1f43 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
@@ -70,19 +70,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Timestamp(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int SecondsFieldNumber = 1;
     private long seconds_;
     public long Seconds {
       get { return seconds_; }
       set {
-        pb::Freezable.CheckMutable(this);
         seconds_ = value;
       }
     }
@@ -92,7 +84,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public int Nanos {
       get { return nanos_; }
       set {
-        pb::Freezable.CheckMutable(this);
         nanos_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
index c6573aa4..719131a4 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
@@ -103,23 +103,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Type(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      fields_.Freeze();
-      oneofs_.Freeze();
-      options_.Freeze();
-      if (sourceContext_ != null) SourceContext.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -153,7 +141,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.SourceContext SourceContext {
       get { return sourceContext_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sourceContext_ = value;
       }
     }
@@ -314,20 +301,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Field(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      options_.Freeze();
-    }
-
     public const int KindFieldNumber = 1;
     private global::Google.Protobuf.WellKnownTypes.Field.Types.Kind kind_ = global::Google.Protobuf.WellKnownTypes.Field.Types.Kind.TYPE_UNKNOWN;
     public global::Google.Protobuf.WellKnownTypes.Field.Types.Kind Kind {
       get { return kind_; }
       set {
-        pb::Freezable.CheckMutable(this);
         kind_ = value;
       }
     }
@@ -337,7 +315,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.Field.Types.Cardinality Cardinality {
       get { return cardinality_; }
       set {
-        pb::Freezable.CheckMutable(this);
         cardinality_ = value;
       }
     }
@@ -347,7 +324,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public int Number {
       get { return number_; }
       set {
-        pb::Freezable.CheckMutable(this);
         number_ = value;
       }
     }
@@ -357,7 +333,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -367,7 +342,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public string TypeUrl {
       get { return typeUrl_; }
       set {
-        pb::Freezable.CheckMutable(this);
         typeUrl_ = value ?? "";
       }
     }
@@ -377,7 +351,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public int OneofIndex {
       get { return oneofIndex_; }
       set {
-        pb::Freezable.CheckMutable(this);
         oneofIndex_ = value;
       }
     }
@@ -387,7 +360,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public bool Packed {
       get { return packed_; }
       set {
-        pb::Freezable.CheckMutable(this);
         packed_ = value;
       }
     }
@@ -642,22 +614,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Enum(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      enumvalue_.Freeze();
-      options_.Freeze();
-      if (sourceContext_ != null) SourceContext.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -683,7 +644,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.SourceContext SourceContext {
       get { return sourceContext_; }
       set {
-        pb::Freezable.CheckMutable(this);
         sourceContext_ = value;
       }
     }
@@ -830,20 +790,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new EnumValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      options_.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -853,7 +804,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public int Number {
       get { return number_; }
       set {
-        pb::Freezable.CheckMutable(this);
         number_ = value;
       }
     }
@@ -992,20 +942,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Option(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-      if (value_ != null) Value.Freeze();
-    }
-
     public const int NameFieldNumber = 1;
     private string name_ = "";
     public string Name {
       get { return name_; }
       set {
-        pb::Freezable.CheckMutable(this);
         name_ = value ?? "";
       }
     }
@@ -1015,7 +956,6 @@ namespace Google.Protobuf.WellKnownTypes {
     public global::Google.Protobuf.WellKnownTypes.Any Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
index 2ea660c6..73577366 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
@@ -78,19 +78,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new DoubleValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private double value_;
     public double Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -195,19 +187,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new FloatValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private float value_;
     public float Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -312,19 +296,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Int64Value(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private long value_;
     public long Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -429,19 +405,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new UInt64Value(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private ulong value_;
     public ulong Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -546,19 +514,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new Int32Value(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private int value_;
     public int Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -663,19 +623,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new UInt32Value(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private uint value_;
     public uint Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -780,19 +732,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new BoolValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private bool value_;
     public bool Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value;
       }
     }
@@ -897,19 +841,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new StringValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private string value_ = "";
     public string Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value ?? "";
       }
     }
@@ -1014,19 +950,11 @@ namespace Google.Protobuf.WellKnownTypes {
       return new BytesValue(this);
     }
 
-    public void Freeze() {
-      if (IsFrozen) {
-        return;
-      }
-      _frozen = true;
-    }
-
     public const int ValueFieldNumber = 1;
     private pb::ByteString value_ = pb::ByteString.Empty;
     public pb::ByteString Value {
       get { return value_; }
       set {
-        pb::Freezable.CheckMutable(this);
         value_ = value ?? pb::ByteString.Empty;
       }
     }
diff --git a/src/google/protobuf/compiler/csharp/csharp_map_field.cc b/src/google/protobuf/compiler/csharp/csharp_map_field.cc
index cba24a59..f84ad6f7 100644
--- a/src/google/protobuf/compiler/csharp/csharp_map_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_map_field.cc
@@ -129,8 +129,6 @@ void MapFieldGenerator::GenerateCloningCode(io::Printer* printer) {
 }
 
 void MapFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
-  printer->Print(variables_,
-    "$name$_.Freeze();\n");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_message.cc b/src/google/protobuf/compiler/csharp/csharp_message.cc
index 81d62741..86ef0489 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message.cc
@@ -190,7 +190,6 @@ void MessageGenerator::Generate(io::Printer* printer) {
       "  get { return $name$Case_; }\n"
       "}\n\n"
       "public void Clear$property_name$() {\n"
-      "  pb::Freezable.CheckMutable(this);\n"
       "  $name$Case_ = $property_name$OneofCase.None;\n"
       "  $name$_ = null;\n"
       "}\n\n");
@@ -293,33 +292,6 @@ void MessageGenerator::GenerateCloningCode(io::Printer* printer) {
 }
 
 void MessageGenerator::GenerateFreezingCode(io::Printer* printer) {
-    map<string, string> vars;
-    vars["class_name"] = class_name();
-    printer->Print(
-      "public void Freeze() {\n"
-      "  if (IsFrozen) {\n"
-      "    return;\n"
-      "  }\n"
-      "  _frozen = true;\n");
-    printer->Indent();
-    // Freeze non-oneof fields first (only messages and repeated fields will actually generate any code)
-    for (int i = 0; i < descriptor_->field_count(); i++) {
-        if (!descriptor_->field(i)->containing_oneof()) {
-            scoped_ptr<FieldGeneratorBase> generator(
-                CreateFieldGeneratorInternal(descriptor_->field(i)));
-            generator->GenerateFreezingCode(printer);
-        }
-    }
-
-    // For each oneof, if the value is freezable, freeze it. We don't actually need to know which type it was.
-    for (int i = 0; i < descriptor_->oneof_decl_count(); ++i) {
-        vars["name"] = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false);
-        printer->Print(vars,
-            "if ($name$_ is IFreezable) ((IFreezable) $name$_).Freeze();\n");
-    }
-
-    printer->Outdent();
-    printer->Print("}\n\n");
 }
 
 void MessageGenerator::GenerateFrameworkMethods(io::Printer* printer) {
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.cc b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
index d2c3a88b..4f576cd1 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
@@ -67,7 +67,6 @@ void MessageFieldGenerator::GenerateMembers(io::Printer* printer) {
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $name$_; }\n"
     "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n"
     "    $name$_ = value;\n"
     "  }\n"
     "}\n");
@@ -134,8 +133,6 @@ void MessageFieldGenerator::GenerateCloningCode(io::Printer* printer) {
 }
 
 void MessageFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
-  printer->Print(variables_,
-    "if ($has_property_check$) $property_name$.Freeze();\n");
 }
 
 void MessageFieldGenerator::GenerateCodecCode(io::Printer* printer) {
@@ -161,7 +158,6 @@ void MessageOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $has_property_check$ ? ($type_name$) $oneof_name$_ : null; }\n"
     "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n"
     "    $oneof_name$_ = value;\n"
     "    $oneof_name$Case_ = value == null ? $oneof_property_name$OneofCase.None : $oneof_property_name$OneofCase.$property_name$;\n"
     "  }\n"
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
index 4454ef02..80f4a92d 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
@@ -73,8 +73,7 @@ void PrimitiveFieldGenerator::GenerateMembers(io::Printer* printer) {
     variables_,
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $name$_; }\n"
-    "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n");
+    "  set {\n");
   if (is_value_type) {
     printer->Print(
       variables_,
@@ -176,8 +175,7 @@ void PrimitiveOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
     variables_,
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $has_property_check$ ? ($type_name$) $oneof_name$_ : $default_value$; }\n"
-    "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n");
+    "  set {\n");
     if (is_value_type) {
       printer->Print(
         variables_,
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc b/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc
index c1b29e2b..625631df 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.cc
@@ -117,8 +117,6 @@ void RepeatedEnumFieldGenerator::GenerateCloningCode(io::Printer* printer) {
 }
 
 void RepeatedEnumFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
-  printer->Print(variables_,
-    "$name$_.Freeze();\n");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
index d939fc79..7fbab681 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.cc
@@ -132,8 +132,6 @@ void RepeatedMessageFieldGenerator::GenerateCloningCode(io::Printer* printer) {
 }
 
 void RepeatedMessageFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
-  printer->Print(variables_,
-    "$name$_.Freeze();\n");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc b/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc
index 5b5d9b3d..1163ce73 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.cc
@@ -115,8 +115,6 @@ void RepeatedPrimitiveFieldGenerator::GenerateCloningCode(io::Printer* printer)
 }
 
 void RepeatedPrimitiveFieldGenerator::GenerateFreezingCode(io::Printer* printer) {
-  printer->Print(variables_,
-    "$name$_.Freeze();\n");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
index 75ef5e50..44f832bf 100644
--- a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.cc
@@ -76,7 +76,6 @@ void WrapperFieldGenerator::GenerateMembers(io::Printer* printer) {
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $name$_; }\n"
     "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n"
     "    $name$_ = value;\n"
     "  }\n"
     "}\n");
@@ -172,7 +171,6 @@ void WrapperOneofFieldGenerator::GenerateMembers(io::Printer* printer) {
     "$access_level$ $type_name$ $property_name$ {\n"
     "  get { return $has_property_check$ ? ($type_name$) $oneof_name$_ : ($type_name$) null; }\n"
     "  set {\n"
-    "    pb::Freezable.CheckMutable(this);\n"
     "    $oneof_name$_ = value;\n"
     "    $oneof_name$Case_ = value == null ? $oneof_property_name$OneofCase.None : $oneof_property_name$OneofCase.$property_name$;\n"
     "  }\n"