diff --git a/cmd/protoc-gen-go-grpc/testdata/grpc/grpc.pb.go b/cmd/protoc-gen-go-grpc/testdata/grpc/grpc.pb.go
index ca53790..778b0eb 100644
--- a/cmd/protoc-gen-go-grpc/testdata/grpc/grpc.pb.go
+++ b/cmd/protoc-gen-go-grpc/testdata/grpc/grpc.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Request struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Request) Reset() {
@@ -43,9 +43,9 @@
 }
 
 type Response struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Response) Reset() {
diff --git a/cmd/protoc-gen-go/internal_gengo/main.go b/cmd/protoc-gen-go/internal_gengo/main.go
index 77f5de3..6bcfebd 100644
--- a/cmd/protoc-gen-go/internal_gengo/main.go
+++ b/cmd/protoc-gen-go/internal_gengo/main.go
@@ -371,10 +371,10 @@
 			tags = append(tags, `protobuf_messageset:"1"`)
 		}
 		tags = append(tags, `json:"-"`)
-		g.P("XXX_InternalExtensions ", protoimplPackage.Ident("ExtensionFieldsV1"), " `", strings.Join(tags, " "), "`")
+		g.P("XXX_InternalExtensions ", protoimplPackage.Ident("ExtensionFields"), " `", strings.Join(tags, " "), "`")
 	}
-	g.P("XXX_unrecognized []byte `json:\"-\"`")
-	g.P("XXX_sizecache int32 `json:\"-\"`")
+	g.P("XXX_unrecognized ", protoimplPackage.Ident("UnknownFields"), " `json:\"-\"`")
+	g.P("XXX_sizecache ", protoimplPackage.Ident("SizeCache"), " `json:\"-\"`")
 	g.P("}")
 	g.P()
 
diff --git a/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go b/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go
index 7a77394..a2cd56f 100644
--- a/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go
+++ b/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go
@@ -63,10 +63,10 @@
 }
 
 type AnnotationsTestMessage struct {
-	AnnotationsTestField *string  `protobuf:"bytes,1,opt,name=AnnotationsTestField" json:"AnnotationsTestField,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	AnnotationsTestField *string                 `protobuf:"bytes,1,opt,name=AnnotationsTestField" json:"AnnotationsTestField,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *AnnotationsTestMessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta b/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta
index 9c18454..318cefc 100644
--- a/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta
+++ b/cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta
@@ -1 +1 @@
-annotation:{path:5 path:0 source_file:"annotations/annotations.proto" begin:461 end:480} annotation:{path:5 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:497 end:544} annotation:{path:4 path:0 source_file:"annotations/annotations.proto" begin:1732 end:1754} annotation:{path:4 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:1765 end:1785} annotation:{path:4 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:2746 end:2769}
\ No newline at end of file
+annotation:{path:5 path:0 source_file:"annotations/annotations.proto" begin:461 end:480} annotation:{path:5 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:497 end:544} annotation:{path:4 path:0 source_file:"annotations/annotations.proto" begin:1732 end:1754} annotation:{path:4 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:1765 end:1785} annotation:{path:4 path:0 path:2 path:0 source_file:"annotations/annotations.proto" begin:2806 end:2829}
\ No newline at end of file
diff --git a/cmd/protoc-gen-go/testdata/comments/comments.pb.go b/cmd/protoc-gen-go/testdata/comments/comments.pb.go
index 8ff9b29..340d9e4 100644
--- a/cmd/protoc-gen-go/testdata/comments/comments.pb.go
+++ b/cmd/protoc-gen-go/testdata/comments/comments.pb.go
@@ -24,10 +24,10 @@
 	// Types that are valid to be assigned to Oneof1A:
 	// COMMENT: Oneof1AField1
 	//	*Message1_Oneof1AField1
-	Oneof1A              isMessage1_Oneof1A `protobuf_oneof:"Oneof1a"`
-	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
-	XXX_unrecognized     []byte             `json:"-"`
-	XXX_sizecache        int32              `json:"-"`
+	Oneof1A              isMessage1_Oneof1A      `protobuf_oneof:"Oneof1a"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message1) Reset() {
@@ -93,9 +93,9 @@
 
 // COMMENT: Message2
 type Message2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message2) Reset() {
@@ -123,9 +123,9 @@
 
 // COMMENT: Message1A
 type Message1_Message1A struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message1_Message1A) Reset() {
@@ -153,9 +153,9 @@
 
 // COMMENT: Message1B
 type Message1_Message1B struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message1_Message1B) Reset() {
@@ -183,9 +183,9 @@
 
 // COMMENT: Message2A
 type Message2_Message2A struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message2_Message2A) Reset() {
@@ -213,9 +213,9 @@
 
 // COMMENT: Message2B
 type Message2_Message2B struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message2_Message2B) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/comments/deprecated.pb.go b/cmd/protoc-gen-go/testdata/comments/deprecated.pb.go
index dac53da..3f37f26 100644
--- a/cmd/protoc-gen-go/testdata/comments/deprecated.pb.go
+++ b/cmd/protoc-gen-go/testdata/comments/deprecated.pb.go
@@ -47,10 +47,10 @@
 
 // Deprecated: Do not use.
 type DeprecatedMessage struct {
-	DeprecatedField      string   `protobuf:"bytes,1,opt,name=deprecated_field,json=deprecatedField,proto3" json:"deprecated_field,omitempty"` // Deprecated: Do not use.
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	DeprecatedField      string                  `protobuf:"bytes,1,opt,name=deprecated_field,json=deprecatedField,proto3" json:"deprecated_field,omitempty"` // Deprecated: Do not use.
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *DeprecatedMessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/extensions/base/base.pb.go b/cmd/protoc-gen-go/testdata/extensions/base/base.pb.go
index cfc0d70..1a2ebb4 100644
--- a/cmd/protoc-gen-go/testdata/extensions/base/base.pb.go
+++ b/cmd/protoc-gen-go/testdata/extensions/base/base.pb.go
@@ -14,11 +14,11 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type BaseMessage struct {
-	Field                  *string                     `protobuf:"bytes,1,opt,name=field" json:"field,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	Field                  *string                   `protobuf:"bytes,1,opt,name=field" json:"field,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *BaseMessage) Reset() {
@@ -62,10 +62,10 @@
 }
 
 type MessageSetWireFormatMessage struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `protobuf_messageset:"1" json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `protobuf_messageset:"1" json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *MessageSetWireFormatMessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/extensions/ext/ext.pb.go b/cmd/protoc-gen-go/testdata/extensions/ext/ext.pb.go
index e4740a4..d7588a3 100644
--- a/cmd/protoc-gen-go/testdata/extensions/ext/ext.pb.go
+++ b/cmd/protoc-gen-go/testdata/extensions/ext/ext.pb.go
@@ -65,10 +65,10 @@
 }
 
 type Message struct {
-	Data                 []byte   `protobuf:"bytes,1,opt,name=data" json:"data,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Data                 []byte                  `protobuf:"bytes,1,opt,name=data" json:"data,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message) Reset() {
@@ -102,10 +102,10 @@
 }
 
 type ExtensionGroup struct {
-	ExtensionGroup       *string  `protobuf:"bytes,120,opt,name=extension_group,json=extensionGroup" json:"extension_group,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ExtensionGroup       *string                 `protobuf:"bytes,120,opt,name=extension_group,json=extensionGroup" json:"extension_group,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ExtensionGroup) Reset() {
@@ -140,9 +140,9 @@
 
 // Extend in the scope of another type.
 type ExtendingMessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ExtendingMessage) Reset() {
@@ -169,10 +169,10 @@
 }
 
 type RepeatedGroup struct {
-	RepeatedXGroup       []string `protobuf:"bytes,319,rep,name=repeated_x_group,json=repeatedXGroup" json:"repeated_x_group,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	RepeatedXGroup       []string                `protobuf:"bytes,319,rep,name=repeated_x_group,json=repeatedXGroup" json:"repeated_x_group,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *RepeatedGroup) Reset() {
@@ -207,10 +207,10 @@
 
 // An extension of an extension.
 type Extendable struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *Extendable) Reset() {
@@ -247,9 +247,9 @@
 
 // Message set wire format.
 type MessageSetWireFormatExtension struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *MessageSetWireFormatExtension) Reset() {
@@ -276,9 +276,9 @@
 }
 
 type Message_M struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message_M) Reset() {
@@ -305,9 +305,9 @@
 }
 
 type ExtendingMessage_ExtendingMessageSubmessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ExtendingMessage_ExtendingMessageSubmessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/extensions/extra/extra.pb.go b/cmd/protoc-gen-go/testdata/extensions/extra/extra.pb.go
index ad3b377..e661567 100644
--- a/cmd/protoc-gen-go/testdata/extensions/extra/extra.pb.go
+++ b/cmd/protoc-gen-go/testdata/extensions/extra/extra.pb.go
@@ -14,10 +14,10 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type ExtraMessage struct {
-	Data                 []byte   `protobuf:"bytes,1,opt,name=data" json:"data,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Data                 []byte                  `protobuf:"bytes,1,opt,name=data" json:"data,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ExtraMessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/extensions/proto3/ext3.pb.go b/cmd/protoc-gen-go/testdata/extensions/proto3/ext3.pb.go
index 47a791d..b5460d0 100644
--- a/cmd/protoc-gen-go/testdata/extensions/proto3/ext3.pb.go
+++ b/cmd/protoc-gen-go/testdata/extensions/proto3/ext3.pb.go
@@ -48,9 +48,9 @@
 }
 
 type Message struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/fieldnames/fieldnames.pb.go b/cmd/protoc-gen-go/testdata/fieldnames/fieldnames.pb.go
index 2165567..580ae0e 100644
--- a/cmd/protoc-gen-go/testdata/fieldnames/fieldnames.pb.go
+++ b/cmd/protoc-gen-go/testdata/fieldnames/fieldnames.pb.go
@@ -54,8 +54,8 @@
 	//	*Message_OneofMessageConflict_
 	OneofConflictC       isMessage_OneofConflictC `protobuf_oneof:"oneof_conflict_c"`
 	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
-	XXX_unrecognized     []byte                   `json:"-"`
-	XXX_sizecache        int32                    `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields  `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache      `json:"-"`
 }
 
 func (x *Message) Reset() {
@@ -275,9 +275,9 @@
 func (*Message_OneofMessageConflict_) isMessage_OneofConflictC() {}
 
 type Message_OneofMessageConflict struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message_OneofMessageConflict) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/import_public/a.pb.go b/cmd/protoc-gen-go/testdata/import_public/a.pb.go
index cf638df..b33e9f0 100644
--- a/cmd/protoc-gen-go/testdata/import_public/a.pb.go
+++ b/cmd/protoc-gen-go/testdata/import_public/a.pb.go
@@ -58,12 +58,12 @@
 type Sub2Message = sub2.Sub2Message
 
 type Public struct {
-	M                    *sub.M   `protobuf:"bytes,1,opt,name=m" json:"m,omitempty"`
-	E                    *sub.E   `protobuf:"varint,2,opt,name=e,enum=goproto.protoc.import_public.sub.E" json:"e,omitempty"`
-	Local                *Local   `protobuf:"bytes,3,opt,name=local" json:"local,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	M                    *sub.M                  `protobuf:"bytes,1,opt,name=m" json:"m,omitempty"`
+	E                    *sub.E                  `protobuf:"varint,2,opt,name=e,enum=goproto.protoc.import_public.sub.E" json:"e,omitempty"`
+	Local                *Local                  `protobuf:"bytes,3,opt,name=local" json:"local,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Public) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/import_public/b.pb.go b/cmd/protoc-gen-go/testdata/import_public/b.pb.go
index 18e9f92..2f966ee 100644
--- a/cmd/protoc-gen-go/testdata/import_public/b.pb.go
+++ b/cmd/protoc-gen-go/testdata/import_public/b.pb.go
@@ -15,11 +15,11 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Local struct {
-	M                    *sub.M   `protobuf:"bytes,1,opt,name=m" json:"m,omitempty"`
-	E                    *sub.E   `protobuf:"varint,2,opt,name=e,enum=goproto.protoc.import_public.sub.E" json:"e,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	M                    *sub.M                  `protobuf:"bytes,1,opt,name=m" json:"m,omitempty"`
+	E                    *sub.E                  `protobuf:"varint,2,opt,name=e,enum=goproto.protoc.import_public.sub.E" json:"e,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Local) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/import_public/sub/a.pb.go b/cmd/protoc-gen-go/testdata/import_public/sub/a.pb.go
index 64b3e59..6c6c93a 100644
--- a/cmd/protoc-gen-go/testdata/import_public/sub/a.pb.go
+++ b/cmd/protoc-gen-go/testdata/import_public/sub/a.pb.go
@@ -175,11 +175,11 @@
 	// Types that are valid to be assigned to OneofField:
 	//	*M_OneofInt32
 	//	*M_OneofInt64
-	OneofField             isM_OneofField              `protobuf_oneof:"oneof_field"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	OneofField             isM_OneofField            `protobuf_oneof:"oneof_field"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *M) Reset() {
@@ -298,8 +298,8 @@
 	//	*M_Submessage_SubmessageOneofInt64
 	SubmessageOneofField isM_Submessage_SubmessageOneofField `protobuf_oneof:"submessage_oneof_field"`
 	XXX_NoUnkeyedLiteral struct{}                            `json:"-"`
-	XXX_unrecognized     []byte                              `json:"-"`
-	XXX_sizecache        int32                               `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields             `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache                 `json:"-"`
 }
 
 func (x *M_Submessage) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/import_public/sub/b.pb.go b/cmd/protoc-gen-go/testdata/import_public/sub/b.pb.go
index 05ae47e..93c3966 100644
--- a/cmd/protoc-gen-go/testdata/import_public/sub/b.pb.go
+++ b/cmd/protoc-gen-go/testdata/import_public/sub/b.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M2) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/import_public/sub2/a.pb.go b/cmd/protoc-gen-go/testdata/import_public/sub2/a.pb.go
index 63a7023..bf58d13 100644
--- a/cmd/protoc-gen-go/testdata/import_public/sub2/a.pb.go
+++ b/cmd/protoc-gen-go/testdata/import_public/sub2/a.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Sub2Message struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Sub2Message) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/fmt/m.pb.go b/cmd/protoc-gen-go/testdata/imports/fmt/m.pb.go
index 68966e2..5821f22 100644
--- a/cmd/protoc-gen-go/testdata/imports/fmt/m.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/fmt/m.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_a_1/m1.pb.go b/cmd/protoc-gen-go/testdata/imports/test_a_1/m1.pb.go
index 29e87c0..d4023d7 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_a_1/m1.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_a_1/m1.pb.go
@@ -47,9 +47,9 @@
 }
 
 type M1 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M1) Reset() {
@@ -76,10 +76,10 @@
 }
 
 type M1_1 struct {
-	M1                   *M1      `protobuf:"bytes,1,opt,name=m1,proto3" json:"m1,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	M1                   *M1                     `protobuf:"bytes,1,opt,name=m1,proto3" json:"m1,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M1_1) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_a_1/m2.pb.go b/cmd/protoc-gen-go/testdata/imports/test_a_1/m2.pb.go
index 9b6e876..f9b829f 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_a_1/m2.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_a_1/m2.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M2) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_a_2/m3.pb.go b/cmd/protoc-gen-go/testdata/imports/test_a_2/m3.pb.go
index 9b914b2..24adcf8 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_a_2/m3.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_a_2/m3.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M3 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M3) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_a_2/m4.pb.go b/cmd/protoc-gen-go/testdata/imports/test_a_2/m4.pb.go
index ff9b36c..9a12200 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_a_2/m4.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_a_2/m4.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M4 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M4) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_b_1/m1.pb.go b/cmd/protoc-gen-go/testdata/imports/test_b_1/m1.pb.go
index 8b4fc40..1a3bbbe 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_b_1/m1.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_b_1/m1.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M1 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M1) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_b_1/m2.pb.go b/cmd/protoc-gen-go/testdata/imports/test_b_1/m2.pb.go
index 0e8e245..d72785e 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_b_1/m2.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_b_1/m2.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type M2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *M2) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_import_a1m1.pb.go b/cmd/protoc-gen-go/testdata/imports/test_import_a1m1.pb.go
index 8297ccc..a2704df 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_import_a1m1.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_import_a1m1.pb.go
@@ -15,10 +15,10 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type A1M1 struct {
-	F                    *test_a_1.M1 `protobuf:"bytes,1,opt,name=f,proto3" json:"f,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
-	XXX_unrecognized     []byte       `json:"-"`
-	XXX_sizecache        int32        `json:"-"`
+	F                    *test_a_1.M1            `protobuf:"bytes,1,opt,name=f,proto3" json:"f,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *A1M1) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_import_a1m2.pb.go b/cmd/protoc-gen-go/testdata/imports/test_import_a1m2.pb.go
index 4ac0733..c337a1b 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_import_a1m2.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_import_a1m2.pb.go
@@ -15,10 +15,10 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type A1M2 struct {
-	F                    *test_a_1.M2 `protobuf:"bytes,1,opt,name=f,proto3" json:"f,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
-	XXX_unrecognized     []byte       `json:"-"`
-	XXX_sizecache        int32        `json:"-"`
+	F                    *test_a_1.M2            `protobuf:"bytes,1,opt,name=f,proto3" json:"f,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *A1M2) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/imports/test_import_all.pb.go b/cmd/protoc-gen-go/testdata/imports/test_import_all.pb.go
index 89d4569..90fed57 100644
--- a/cmd/protoc-gen-go/testdata/imports/test_import_all.pb.go
+++ b/cmd/protoc-gen-go/testdata/imports/test_import_all.pb.go
@@ -18,14 +18,14 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type All struct {
-	Am1                  *test_a_1.M1 `protobuf:"bytes,1,opt,name=am1,proto3" json:"am1,omitempty"`
-	Am2                  *test_a_1.M2 `protobuf:"bytes,2,opt,name=am2,proto3" json:"am2,omitempty"`
-	Bm1                  *test_b_1.M1 `protobuf:"bytes,5,opt,name=bm1,proto3" json:"bm1,omitempty"`
-	Bm2                  *test_b_1.M2 `protobuf:"bytes,6,opt,name=bm2,proto3" json:"bm2,omitempty"`
-	Fmt                  *fmt.M       `protobuf:"bytes,7,opt,name=fmt,proto3" json:"fmt,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
-	XXX_unrecognized     []byte       `json:"-"`
-	XXX_sizecache        int32        `json:"-"`
+	Am1                  *test_a_1.M1            `protobuf:"bytes,1,opt,name=am1,proto3" json:"am1,omitempty"`
+	Am2                  *test_a_1.M2            `protobuf:"bytes,2,opt,name=am2,proto3" json:"am2,omitempty"`
+	Bm1                  *test_b_1.M1            `protobuf:"bytes,5,opt,name=bm1,proto3" json:"bm1,omitempty"`
+	Bm2                  *test_b_1.M2            `protobuf:"bytes,6,opt,name=bm2,proto3" json:"bm2,omitempty"`
+	Fmt                  *fmt.M                  `protobuf:"bytes,7,opt,name=fmt,proto3" json:"fmt,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *All) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/issue780_oneof_conflict/test.pb.go b/cmd/protoc-gen-go/testdata/issue780_oneof_conflict/test.pb.go
index 514b1c8..b87e4d4 100644
--- a/cmd/protoc-gen-go/testdata/issue780_oneof_conflict/test.pb.go
+++ b/cmd/protoc-gen-go/testdata/issue780_oneof_conflict/test.pb.go
@@ -16,10 +16,10 @@
 type Foo struct {
 	// Types that are valid to be assigned to Bar:
 	//	*Foo_GetBar
-	Bar                  isFoo_Bar `protobuf_oneof:"bar"`
-	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
-	XXX_unrecognized     []byte    `json:"-"`
-	XXX_sizecache        int32     `json:"-"`
+	Bar                  isFoo_Bar               `protobuf_oneof:"bar"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Foo) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/nopackage/nopackage.pb.go b/cmd/protoc-gen-go/testdata/nopackage/nopackage.pb.go
index 5398c1f..b56eec1 100644
--- a/cmd/protoc-gen-go/testdata/nopackage/nopackage.pb.go
+++ b/cmd/protoc-gen-go/testdata/nopackage/nopackage.pb.go
@@ -63,11 +63,11 @@
 }
 
 type Message struct {
-	StringField          *string  `protobuf:"bytes,1,opt,name=string_field,json=stringField" json:"string_field,omitempty"`
-	EnumField            *Enum    `protobuf:"varint,2,opt,name=enum_field,json=enumField,enum=Enum,def=0" json:"enum_field,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	StringField          *string                 `protobuf:"bytes,1,opt,name=string_field,json=stringField" json:"string_field,omitempty"`
+	EnumField            *Enum                   `protobuf:"varint,2,opt,name=enum_field,json=enumField,enum=Enum,def=0" json:"enum_field,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/proto2/enum.pb.go b/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
index 071d96a..d73fa9e 100644
--- a/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/enum.pb.go
@@ -321,11 +321,11 @@
 }
 
 type EnumContainerMessage1 struct {
-	DefaultDuplicate1    *EnumType2 `protobuf:"varint,1,opt,name=default_duplicate1,json=defaultDuplicate1,enum=goproto.protoc.proto2.EnumType2,def=1" json:"default_duplicate1,omitempty"`
-	DefaultDuplicate2    *EnumType2 `protobuf:"varint,2,opt,name=default_duplicate2,json=defaultDuplicate2,enum=goproto.protoc.proto2.EnumType2,def=1" json:"default_duplicate2,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}   `json:"-"`
-	XXX_unrecognized     []byte     `json:"-"`
-	XXX_sizecache        int32      `json:"-"`
+	DefaultDuplicate1    *EnumType2              `protobuf:"varint,1,opt,name=default_duplicate1,json=defaultDuplicate1,enum=goproto.protoc.proto2.EnumType2,def=1" json:"default_duplicate1,omitempty"`
+	DefaultDuplicate2    *EnumType2              `protobuf:"varint,2,opt,name=default_duplicate2,json=defaultDuplicate2,enum=goproto.protoc.proto2.EnumType2,def=1" json:"default_duplicate2,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumContainerMessage1) Reset() {
@@ -369,9 +369,9 @@
 }
 
 type EnumContainerMessage1_EnumContainerMessage2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumContainerMessage1_EnumContainerMessage2) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
index eb2a01a..139fa80 100644
--- a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
@@ -174,8 +174,8 @@
 	//	*FieldTestMessage_OneofTwo_2
 	OneofTwo             isFieldTestMessage_OneofTwo `protobuf_oneof:"oneof_two"`
 	XXX_NoUnkeyedLiteral struct{}                    `json:"-"`
-	XXX_unrecognized     []byte                      `json:"-"`
-	XXX_sizecache        int32                       `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields     `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache         `json:"-"`
 }
 
 func (x *FieldTestMessage) Reset() {
@@ -1119,10 +1119,10 @@
 func (*FieldTestMessage_OneofTwo_2) isFieldTestMessage_OneofTwo() {}
 
 type FieldTestMessage_OptionalGroup struct {
-	OptionalGroup        *string  `protobuf:"bytes,19,opt,name=optional_group,json=optionalGroup" json:"optional_group,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptionalGroup        *string                 `protobuf:"bytes,19,opt,name=optional_group,json=optionalGroup" json:"optional_group,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_OptionalGroup) Reset() {
@@ -1156,10 +1156,10 @@
 }
 
 type FieldTestMessage_RequiredGroup struct {
-	RequiredGroup        *string  `protobuf:"bytes,119,req,name=required_group,json=requiredGroup" json:"required_group,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	RequiredGroup        *string                 `protobuf:"bytes,119,req,name=required_group,json=requiredGroup" json:"required_group,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_RequiredGroup) Reset() {
@@ -1193,10 +1193,10 @@
 }
 
 type FieldTestMessage_RepeatedGroup struct {
-	RepeatedGroup        []string `protobuf:"bytes,219,rep,name=repeated_group,json=repeatedGroup" json:"repeated_group,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	RepeatedGroup        []string                `protobuf:"bytes,219,rep,name=repeated_group,json=repeatedGroup" json:"repeated_group,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_RepeatedGroup) Reset() {
@@ -1230,10 +1230,10 @@
 }
 
 type FieldTestMessage_OneofGroup struct {
-	OneofGroupField      *string  `protobuf:"bytes,619,opt,name=oneof_group_field,json=oneofGroupField" json:"oneof_group_field,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OneofGroupField      *string                 `protobuf:"bytes,619,opt,name=oneof_group_field,json=oneofGroupField" json:"oneof_group_field,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_OneofGroup) Reset() {
@@ -1267,9 +1267,9 @@
 }
 
 type FieldTestMessage_Message struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_Message) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go b/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
index 49cc234..1244664 100644
--- a/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/nested_messages.pb.go
@@ -14,11 +14,11 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Layer1 struct {
-	L2                   *Layer1_Layer2        `protobuf:"bytes,1,opt,name=l2" json:"l2,omitempty"`
-	L3                   *Layer1_Layer2_Layer3 `protobuf:"bytes,2,opt,name=l3" json:"l3,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}              `json:"-"`
-	XXX_unrecognized     []byte                `json:"-"`
-	XXX_sizecache        int32                 `json:"-"`
+	L2                   *Layer1_Layer2          `protobuf:"bytes,1,opt,name=l2" json:"l2,omitempty"`
+	L3                   *Layer1_Layer2_Layer3   `protobuf:"bytes,2,opt,name=l3" json:"l3,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Layer1) Reset() {
@@ -59,10 +59,10 @@
 }
 
 type Layer1_Layer2 struct {
-	L3                   *Layer1_Layer2_Layer3 `protobuf:"bytes,1,opt,name=l3" json:"l3,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}              `json:"-"`
-	XXX_unrecognized     []byte                `json:"-"`
-	XXX_sizecache        int32                 `json:"-"`
+	L3                   *Layer1_Layer2_Layer3   `protobuf:"bytes,1,opt,name=l3" json:"l3,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Layer1_Layer2) Reset() {
@@ -96,9 +96,9 @@
 }
 
 type Layer1_Layer2_Layer3 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Layer1_Layer2_Layer3) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go b/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
index 7001b59..40670b2 100644
--- a/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/proto2.pb.go
@@ -14,11 +14,11 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Message struct {
-	I32                  *int32   `protobuf:"varint,1,opt,name=i32" json:"i32,omitempty"`
-	M                    *Message `protobuf:"bytes,2,opt,name=m" json:"m,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	I32                  *int32                  `protobuf:"varint,1,opt,name=i32" json:"i32,omitempty"`
+	M                    *Message                `protobuf:"bytes,2,opt,name=m" json:"m,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message) Reset() {
diff --git a/cmd/protoc-gen-go/testdata/proto3/fields.pb.go b/cmd/protoc-gen-go/testdata/proto3/fields.pb.go
index f62795e..321bca3 100644
--- a/cmd/protoc-gen-go/testdata/proto3/fields.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto3/fields.pb.go
@@ -85,8 +85,8 @@
 	MapStringMessage     map[string]*FieldTestMessage_Message `protobuf:"bytes,501,rep,name=map_string_message,json=mapStringMessage,proto3" json:"map_string_message,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	MapFixed64Enum       map[uint64]FieldTestMessage_Enum     `protobuf:"bytes,502,rep,name=map_fixed64_enum,json=mapFixed64Enum,proto3" json:"map_fixed64_enum,omitempty" protobuf_key:"fixed64,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3,enum=goproto.protoc.proto3.FieldTestMessage_Enum"`
 	XXX_NoUnkeyedLiteral struct{}                             `json:"-"`
-	XXX_unrecognized     []byte                               `json:"-"`
-	XXX_sizecache        int32                                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields              `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache                  `json:"-"`
 }
 
 func (x *FieldTestMessage) Reset() {
@@ -372,9 +372,9 @@
 }
 
 type FieldTestMessage_Message struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldTestMessage_Message) Reset() {
diff --git a/encoding/testprotos/pb2/test.pb.go b/encoding/testprotos/pb2/test.pb.go
index eda6866..f5b9f40 100644
--- a/encoding/testprotos/pb2/test.pb.go
+++ b/encoding/testprotos/pb2/test.pb.go
@@ -126,24 +126,24 @@
 
 // Scalars contains optional scalar fields.
 type Scalars struct {
-	OptBool              *bool    `protobuf:"varint,1,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
-	OptInt32             *int32   `protobuf:"varint,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
-	OptInt64             *int64   `protobuf:"varint,3,opt,name=opt_int64,json=optInt64" json:"opt_int64,omitempty"`
-	OptUint32            *uint32  `protobuf:"varint,4,opt,name=opt_uint32,json=optUint32" json:"opt_uint32,omitempty"`
-	OptUint64            *uint64  `protobuf:"varint,5,opt,name=opt_uint64,json=optUint64" json:"opt_uint64,omitempty"`
-	OptSint32            *int32   `protobuf:"zigzag32,6,opt,name=opt_sint32,json=optSint32" json:"opt_sint32,omitempty"`
-	OptSint64            *int64   `protobuf:"zigzag64,7,opt,name=opt_sint64,json=optSint64" json:"opt_sint64,omitempty"`
-	OptFixed32           *uint32  `protobuf:"fixed32,8,opt,name=opt_fixed32,json=optFixed32" json:"opt_fixed32,omitempty"`
-	OptFixed64           *uint64  `protobuf:"fixed64,9,opt,name=opt_fixed64,json=optFixed64" json:"opt_fixed64,omitempty"`
-	OptSfixed32          *int32   `protobuf:"fixed32,10,opt,name=opt_sfixed32,json=optSfixed32" json:"opt_sfixed32,omitempty"`
-	OptSfixed64          *int64   `protobuf:"fixed64,11,opt,name=opt_sfixed64,json=optSfixed64" json:"opt_sfixed64,omitempty"`
-	OptFloat             *float32 `protobuf:"fixed32,20,opt,name=opt_float,json=optFloat" json:"opt_float,omitempty"`
-	OptDouble            *float64 `protobuf:"fixed64,21,opt,name=opt_double,json=optDouble" json:"opt_double,omitempty"`
-	OptBytes             []byte   `protobuf:"bytes,14,opt,name=opt_bytes,json=optBytes" json:"opt_bytes,omitempty"`
-	OptString            *string  `protobuf:"bytes,13,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptBool              *bool                   `protobuf:"varint,1,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
+	OptInt32             *int32                  `protobuf:"varint,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
+	OptInt64             *int64                  `protobuf:"varint,3,opt,name=opt_int64,json=optInt64" json:"opt_int64,omitempty"`
+	OptUint32            *uint32                 `protobuf:"varint,4,opt,name=opt_uint32,json=optUint32" json:"opt_uint32,omitempty"`
+	OptUint64            *uint64                 `protobuf:"varint,5,opt,name=opt_uint64,json=optUint64" json:"opt_uint64,omitempty"`
+	OptSint32            *int32                  `protobuf:"zigzag32,6,opt,name=opt_sint32,json=optSint32" json:"opt_sint32,omitempty"`
+	OptSint64            *int64                  `protobuf:"zigzag64,7,opt,name=opt_sint64,json=optSint64" json:"opt_sint64,omitempty"`
+	OptFixed32           *uint32                 `protobuf:"fixed32,8,opt,name=opt_fixed32,json=optFixed32" json:"opt_fixed32,omitempty"`
+	OptFixed64           *uint64                 `protobuf:"fixed64,9,opt,name=opt_fixed64,json=optFixed64" json:"opt_fixed64,omitempty"`
+	OptSfixed32          *int32                  `protobuf:"fixed32,10,opt,name=opt_sfixed32,json=optSfixed32" json:"opt_sfixed32,omitempty"`
+	OptSfixed64          *int64                  `protobuf:"fixed64,11,opt,name=opt_sfixed64,json=optSfixed64" json:"opt_sfixed64,omitempty"`
+	OptFloat             *float32                `protobuf:"fixed32,20,opt,name=opt_float,json=optFloat" json:"opt_float,omitempty"`
+	OptDouble            *float64                `protobuf:"fixed64,21,opt,name=opt_double,json=optDouble" json:"opt_double,omitempty"`
+	OptBytes             []byte                  `protobuf:"bytes,14,opt,name=opt_bytes,json=optBytes" json:"opt_bytes,omitempty"`
+	OptString            *string                 `protobuf:"bytes,13,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Scalars) Reset() {
@@ -276,13 +276,13 @@
 
 // Message contains enum fields.
 type Enums struct {
-	OptEnum              *Enum              `protobuf:"varint,1,opt,name=opt_enum,json=optEnum,enum=pb2.Enum" json:"opt_enum,omitempty"`
-	RptEnum              []Enum             `protobuf:"varint,2,rep,name=rpt_enum,json=rptEnum,enum=pb2.Enum" json:"rpt_enum,omitempty"`
-	OptNestedEnum        *Enums_NestedEnum  `protobuf:"varint,3,opt,name=opt_nested_enum,json=optNestedEnum,enum=pb2.Enums_NestedEnum" json:"opt_nested_enum,omitempty"`
-	RptNestedEnum        []Enums_NestedEnum `protobuf:"varint,4,rep,name=rpt_nested_enum,json=rptNestedEnum,enum=pb2.Enums_NestedEnum" json:"rpt_nested_enum,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
-	XXX_unrecognized     []byte             `json:"-"`
-	XXX_sizecache        int32              `json:"-"`
+	OptEnum              *Enum                   `protobuf:"varint,1,opt,name=opt_enum,json=optEnum,enum=pb2.Enum" json:"opt_enum,omitempty"`
+	RptEnum              []Enum                  `protobuf:"varint,2,rep,name=rpt_enum,json=rptEnum,enum=pb2.Enum" json:"rpt_enum,omitempty"`
+	OptNestedEnum        *Enums_NestedEnum       `protobuf:"varint,3,opt,name=opt_nested_enum,json=optNestedEnum,enum=pb2.Enums_NestedEnum" json:"opt_nested_enum,omitempty"`
+	RptNestedEnum        []Enums_NestedEnum      `protobuf:"varint,4,rep,name=rpt_nested_enum,json=rptNestedEnum,enum=pb2.Enums_NestedEnum" json:"rpt_nested_enum,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Enums) Reset() {
@@ -338,18 +338,18 @@
 
 // Message contains repeated fields.
 type Repeats struct {
-	RptBool              []bool    `protobuf:"varint,1,rep,name=rpt_bool,json=rptBool" json:"rpt_bool,omitempty"`
-	RptInt32             []int32   `protobuf:"varint,2,rep,name=rpt_int32,json=rptInt32" json:"rpt_int32,omitempty"`
-	RptInt64             []int64   `protobuf:"varint,3,rep,name=rpt_int64,json=rptInt64" json:"rpt_int64,omitempty"`
-	RptUint32            []uint32  `protobuf:"varint,4,rep,name=rpt_uint32,json=rptUint32" json:"rpt_uint32,omitempty"`
-	RptUint64            []uint64  `protobuf:"varint,5,rep,name=rpt_uint64,json=rptUint64" json:"rpt_uint64,omitempty"`
-	RptFloat             []float32 `protobuf:"fixed32,6,rep,name=rpt_float,json=rptFloat" json:"rpt_float,omitempty"`
-	RptDouble            []float64 `protobuf:"fixed64,7,rep,name=rpt_double,json=rptDouble" json:"rpt_double,omitempty"`
-	RptString            []string  `protobuf:"bytes,8,rep,name=rpt_string,json=rptString" json:"rpt_string,omitempty"`
-	RptBytes             [][]byte  `protobuf:"bytes,9,rep,name=rpt_bytes,json=rptBytes" json:"rpt_bytes,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
-	XXX_unrecognized     []byte    `json:"-"`
-	XXX_sizecache        int32     `json:"-"`
+	RptBool              []bool                  `protobuf:"varint,1,rep,name=rpt_bool,json=rptBool" json:"rpt_bool,omitempty"`
+	RptInt32             []int32                 `protobuf:"varint,2,rep,name=rpt_int32,json=rptInt32" json:"rpt_int32,omitempty"`
+	RptInt64             []int64                 `protobuf:"varint,3,rep,name=rpt_int64,json=rptInt64" json:"rpt_int64,omitempty"`
+	RptUint32            []uint32                `protobuf:"varint,4,rep,name=rpt_uint32,json=rptUint32" json:"rpt_uint32,omitempty"`
+	RptUint64            []uint64                `protobuf:"varint,5,rep,name=rpt_uint64,json=rptUint64" json:"rpt_uint64,omitempty"`
+	RptFloat             []float32               `protobuf:"fixed32,6,rep,name=rpt_float,json=rptFloat" json:"rpt_float,omitempty"`
+	RptDouble            []float64               `protobuf:"fixed64,7,rep,name=rpt_double,json=rptDouble" json:"rpt_double,omitempty"`
+	RptString            []string                `protobuf:"bytes,8,rep,name=rpt_string,json=rptString" json:"rpt_string,omitempty"`
+	RptBytes             [][]byte                `protobuf:"bytes,9,rep,name=rpt_bytes,json=rptBytes" json:"rpt_bytes,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Repeats) Reset() {
@@ -440,11 +440,11 @@
 
 // Message type used as submessage.
 type Nested struct {
-	OptString            *string  `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	OptNested            *Nested  `protobuf:"bytes,2,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptString            *string                 `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	OptNested            *Nested                 `protobuf:"bytes,2,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nested) Reset() {
@@ -486,13 +486,13 @@
 
 // Message contains message and group fields.
 type Nests struct {
-	OptNested            *Nested           `protobuf:"bytes,1,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
-	Optgroup             *Nests_OptGroup   `protobuf:"group,2,opt,name=OptGroup,json=optgroup" json:"optgroup,omitempty"`
-	RptNested            []*Nested         `protobuf:"bytes,4,rep,name=rpt_nested,json=rptNested" json:"rpt_nested,omitempty"`
-	Rptgroup             []*Nests_RptGroup `protobuf:"group,5,rep,name=RptGroup,json=rptgroup" json:"rptgroup,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
+	OptNested            *Nested                 `protobuf:"bytes,1,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
+	Optgroup             *Nests_OptGroup         `protobuf:"group,2,opt,name=OptGroup,json=optgroup" json:"optgroup,omitempty"`
+	RptNested            []*Nested               `protobuf:"bytes,4,rep,name=rpt_nested,json=rptNested" json:"rpt_nested,omitempty"`
+	Rptgroup             []*Nests_RptGroup       `protobuf:"group,5,rep,name=RptGroup,json=rptgroup" json:"rptgroup,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nests) Reset() {
@@ -548,15 +548,15 @@
 
 // Message contains required fields.
 type Requireds struct {
-	ReqBool              *bool    `protobuf:"varint,1,req,name=req_bool,json=reqBool" json:"req_bool,omitempty"`
-	ReqSfixed64          *int64   `protobuf:"fixed64,2,req,name=req_sfixed64,json=reqSfixed64" json:"req_sfixed64,omitempty"`
-	ReqDouble            *float64 `protobuf:"fixed64,3,req,name=req_double,json=reqDouble" json:"req_double,omitempty"`
-	ReqString            *string  `protobuf:"bytes,4,req,name=req_string,json=reqString" json:"req_string,omitempty"`
-	ReqEnum              *Enum    `protobuf:"varint,5,req,name=req_enum,json=reqEnum,enum=pb2.Enum" json:"req_enum,omitempty"`
-	ReqNested            *Nested  `protobuf:"bytes,6,req,name=req_nested,json=reqNested" json:"req_nested,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ReqBool              *bool                   `protobuf:"varint,1,req,name=req_bool,json=reqBool" json:"req_bool,omitempty"`
+	ReqSfixed64          *int64                  `protobuf:"fixed64,2,req,name=req_sfixed64,json=reqSfixed64" json:"req_sfixed64,omitempty"`
+	ReqDouble            *float64                `protobuf:"fixed64,3,req,name=req_double,json=reqDouble" json:"req_double,omitempty"`
+	ReqString            *string                 `protobuf:"bytes,4,req,name=req_string,json=reqString" json:"req_string,omitempty"`
+	ReqEnum              *Enum                   `protobuf:"varint,5,req,name=req_enum,json=reqEnum,enum=pb2.Enum" json:"req_enum,omitempty"`
+	ReqNested            *Nested                 `protobuf:"bytes,6,req,name=req_nested,json=reqNested" json:"req_nested,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Requireds) Reset() {
@@ -626,11 +626,11 @@
 
 // Message contains both required and optional fields.
 type PartialRequired struct {
-	ReqString            *string  `protobuf:"bytes,1,req,name=req_string,json=reqString" json:"req_string,omitempty"`
-	OptString            *string  `protobuf:"bytes,2,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ReqString            *string                 `protobuf:"bytes,1,req,name=req_string,json=reqString" json:"req_string,omitempty"`
+	OptString            *string                 `protobuf:"bytes,2,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *PartialRequired) Reset() {
@@ -671,10 +671,10 @@
 }
 
 type NestedWithRequired struct {
-	ReqString            *string  `protobuf:"bytes,1,req,name=req_string,json=reqString" json:"req_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ReqString            *string                 `protobuf:"bytes,1,req,name=req_string,json=reqString" json:"req_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *NestedWithRequired) Reset() {
@@ -715,8 +715,8 @@
 	//	*IndirectRequired_OneofNested
 	Union                isIndirectRequired_Union `protobuf_oneof:"union"`
 	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
-	XXX_unrecognized     []byte                   `json:"-"`
-	XXX_sizecache        int32                    `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields  `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache      `json:"-"`
 }
 
 func (x *IndirectRequired) Reset() {
@@ -795,13 +795,13 @@
 func (*IndirectRequired_OneofNested) isIndirectRequired_Union() {}
 
 type Extensions struct {
-	OptString              *string                     `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	OptBool                *bool                       `protobuf:"varint,101,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
-	OptInt32               *int32                      `protobuf:"varint,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	OptString              *string                   `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	OptBool                *bool                     `protobuf:"varint,101,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
+	OptInt32               *int32                    `protobuf:"varint,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *Extensions) Reset() {
@@ -858,9 +858,9 @@
 }
 
 type ExtensionsContainer struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ExtensionsContainer) Reset() {
@@ -887,10 +887,10 @@
 }
 
 type MessageSet struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `protobuf_messageset:"1" json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `protobuf_messageset:"1" json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *MessageSet) Reset() {
@@ -926,10 +926,10 @@
 }
 
 type MessageSetExtension struct {
-	OptString            *string  `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptString            *string                 `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *MessageSetExtension) Reset() {
@@ -963,10 +963,10 @@
 }
 
 type FakeMessageSet struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *FakeMessageSet) Reset() {
@@ -1002,10 +1002,10 @@
 }
 
 type FakeMessageSetExtension struct {
-	OptString            *string  `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptString            *string                 `protobuf:"bytes,1,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FakeMessageSetExtension) Reset() {
@@ -1040,27 +1040,27 @@
 
 // Message contains well-known type fields.
 type KnownTypes struct {
-	OptBool              *known.BoolValue   `protobuf:"bytes,1,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
-	OptInt32             *known.Int32Value  `protobuf:"bytes,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
-	OptInt64             *known.Int64Value  `protobuf:"bytes,3,opt,name=opt_int64,json=optInt64" json:"opt_int64,omitempty"`
-	OptUint32            *known.UInt32Value `protobuf:"bytes,4,opt,name=opt_uint32,json=optUint32" json:"opt_uint32,omitempty"`
-	OptUint64            *known.UInt64Value `protobuf:"bytes,5,opt,name=opt_uint64,json=optUint64" json:"opt_uint64,omitempty"`
-	OptFloat             *known.FloatValue  `protobuf:"bytes,6,opt,name=opt_float,json=optFloat" json:"opt_float,omitempty"`
-	OptDouble            *known.DoubleValue `protobuf:"bytes,7,opt,name=opt_double,json=optDouble" json:"opt_double,omitempty"`
-	OptString            *known.StringValue `protobuf:"bytes,8,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
-	OptBytes             *known.BytesValue  `protobuf:"bytes,9,opt,name=opt_bytes,json=optBytes" json:"opt_bytes,omitempty"`
-	OptDuration          *known.Duration    `protobuf:"bytes,20,opt,name=opt_duration,json=optDuration" json:"opt_duration,omitempty"`
-	OptTimestamp         *known.Timestamp   `protobuf:"bytes,21,opt,name=opt_timestamp,json=optTimestamp" json:"opt_timestamp,omitempty"`
-	OptStruct            *known.Struct      `protobuf:"bytes,25,opt,name=opt_struct,json=optStruct" json:"opt_struct,omitempty"`
-	OptList              *known.ListValue   `protobuf:"bytes,26,opt,name=opt_list,json=optList" json:"opt_list,omitempty"`
-	OptValue             *known.Value       `protobuf:"bytes,27,opt,name=opt_value,json=optValue" json:"opt_value,omitempty"`
-	OptNull              *known.NullValue   `protobuf:"varint,28,opt,name=opt_null,json=optNull,enum=google.protobuf.NullValue" json:"opt_null,omitempty"`
-	OptEmpty             *known.Empty       `protobuf:"bytes,30,opt,name=opt_empty,json=optEmpty" json:"opt_empty,omitempty"`
-	OptAny               *known.Any         `protobuf:"bytes,32,opt,name=opt_any,json=optAny" json:"opt_any,omitempty"`
-	OptFieldmask         *known.FieldMask   `protobuf:"bytes,40,opt,name=opt_fieldmask,json=optFieldmask" json:"opt_fieldmask,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
-	XXX_unrecognized     []byte             `json:"-"`
-	XXX_sizecache        int32              `json:"-"`
+	OptBool              *known.BoolValue        `protobuf:"bytes,1,opt,name=opt_bool,json=optBool" json:"opt_bool,omitempty"`
+	OptInt32             *known.Int32Value       `protobuf:"bytes,2,opt,name=opt_int32,json=optInt32" json:"opt_int32,omitempty"`
+	OptInt64             *known.Int64Value       `protobuf:"bytes,3,opt,name=opt_int64,json=optInt64" json:"opt_int64,omitempty"`
+	OptUint32            *known.UInt32Value      `protobuf:"bytes,4,opt,name=opt_uint32,json=optUint32" json:"opt_uint32,omitempty"`
+	OptUint64            *known.UInt64Value      `protobuf:"bytes,5,opt,name=opt_uint64,json=optUint64" json:"opt_uint64,omitempty"`
+	OptFloat             *known.FloatValue       `protobuf:"bytes,6,opt,name=opt_float,json=optFloat" json:"opt_float,omitempty"`
+	OptDouble            *known.DoubleValue      `protobuf:"bytes,7,opt,name=opt_double,json=optDouble" json:"opt_double,omitempty"`
+	OptString            *known.StringValue      `protobuf:"bytes,8,opt,name=opt_string,json=optString" json:"opt_string,omitempty"`
+	OptBytes             *known.BytesValue       `protobuf:"bytes,9,opt,name=opt_bytes,json=optBytes" json:"opt_bytes,omitempty"`
+	OptDuration          *known.Duration         `protobuf:"bytes,20,opt,name=opt_duration,json=optDuration" json:"opt_duration,omitempty"`
+	OptTimestamp         *known.Timestamp        `protobuf:"bytes,21,opt,name=opt_timestamp,json=optTimestamp" json:"opt_timestamp,omitempty"`
+	OptStruct            *known.Struct           `protobuf:"bytes,25,opt,name=opt_struct,json=optStruct" json:"opt_struct,omitempty"`
+	OptList              *known.ListValue        `protobuf:"bytes,26,opt,name=opt_list,json=optList" json:"opt_list,omitempty"`
+	OptValue             *known.Value            `protobuf:"bytes,27,opt,name=opt_value,json=optValue" json:"opt_value,omitempty"`
+	OptNull              *known.NullValue        `protobuf:"varint,28,opt,name=opt_null,json=optNull,enum=google.protobuf.NullValue" json:"opt_null,omitempty"`
+	OptEmpty             *known.Empty            `protobuf:"bytes,30,opt,name=opt_empty,json=optEmpty" json:"opt_empty,omitempty"`
+	OptAny               *known.Any              `protobuf:"bytes,32,opt,name=opt_any,json=optAny" json:"opt_any,omitempty"`
+	OptFieldmask         *known.FieldMask        `protobuf:"bytes,40,opt,name=opt_fieldmask,json=optFieldmask" json:"opt_fieldmask,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *KnownTypes) Reset() {
@@ -1217,8 +1217,8 @@
 	OptNested            *Nested                        `protobuf:"bytes,2,opt,name=opt_nested,json=optNested" json:"opt_nested,omitempty"`
 	Optnestedgroup       *Nests_OptGroup_OptNestedGroup `protobuf:"group,3,opt,name=OptNestedGroup,json=optnestedgroup" json:"optnestedgroup,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                       `json:"-"`
-	XXX_unrecognized     []byte                         `json:"-"`
-	XXX_sizecache        int32                          `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields        `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache            `json:"-"`
 }
 
 func (x *Nests_OptGroup) Reset() {
@@ -1266,10 +1266,10 @@
 }
 
 type Nests_RptGroup struct {
-	RptString            []string `protobuf:"bytes,1,rep,name=rpt_string,json=rptString" json:"rpt_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	RptString            []string                `protobuf:"bytes,1,rep,name=rpt_string,json=rptString" json:"rpt_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nests_RptGroup) Reset() {
@@ -1303,10 +1303,10 @@
 }
 
 type Nests_OptGroup_OptNestedGroup struct {
-	OptFixed32           *uint32  `protobuf:"fixed32,1,opt,name=opt_fixed32,json=optFixed32" json:"opt_fixed32,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	OptFixed32           *uint32                 `protobuf:"fixed32,1,opt,name=opt_fixed32,json=optFixed32" json:"opt_fixed32,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nests_OptGroup_OptNestedGroup) Reset() {
diff --git a/encoding/testprotos/pb3/test.pb.go b/encoding/testprotos/pb3/test.pb.go
index 7e1c443..0e0b2b3 100644
--- a/encoding/testprotos/pb3/test.pb.go
+++ b/encoding/testprotos/pb3/test.pb.go
@@ -99,24 +99,24 @@
 
 // Scalars contains scalar field types.
 type Scalars struct {
-	SBool                bool     `protobuf:"varint,1,opt,name=s_bool,json=sBool,proto3" json:"s_bool,omitempty"`
-	SInt32               int32    `protobuf:"varint,2,opt,name=s_int32,json=sInt32,proto3" json:"s_int32,omitempty"`
-	SInt64               int64    `protobuf:"varint,3,opt,name=s_int64,json=sInt64,proto3" json:"s_int64,omitempty"`
-	SUint32              uint32   `protobuf:"varint,4,opt,name=s_uint32,json=sUint32,proto3" json:"s_uint32,omitempty"`
-	SUint64              uint64   `protobuf:"varint,5,opt,name=s_uint64,json=sUint64,proto3" json:"s_uint64,omitempty"`
-	SSint32              int32    `protobuf:"zigzag32,6,opt,name=s_sint32,json=sSint32,proto3" json:"s_sint32,omitempty"`
-	SSint64              int64    `protobuf:"zigzag64,7,opt,name=s_sint64,json=sSint64,proto3" json:"s_sint64,omitempty"`
-	SFixed32             uint32   `protobuf:"fixed32,8,opt,name=s_fixed32,json=sFixed32,proto3" json:"s_fixed32,omitempty"`
-	SFixed64             uint64   `protobuf:"fixed64,9,opt,name=s_fixed64,json=sFixed64,proto3" json:"s_fixed64,omitempty"`
-	SSfixed32            int32    `protobuf:"fixed32,10,opt,name=s_sfixed32,json=sSfixed32,proto3" json:"s_sfixed32,omitempty"`
-	SSfixed64            int64    `protobuf:"fixed64,11,opt,name=s_sfixed64,json=sSfixed64,proto3" json:"s_sfixed64,omitempty"`
-	SFloat               float32  `protobuf:"fixed32,20,opt,name=s_float,json=sFloat,proto3" json:"s_float,omitempty"`
-	SDouble              float64  `protobuf:"fixed64,21,opt,name=s_double,json=sDouble,proto3" json:"s_double,omitempty"`
-	SBytes               []byte   `protobuf:"bytes,14,opt,name=s_bytes,json=sBytes,proto3" json:"s_bytes,omitempty"`
-	SString              string   `protobuf:"bytes,13,opt,name=s_string,json=sString,proto3" json:"s_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	SBool                bool                    `protobuf:"varint,1,opt,name=s_bool,json=sBool,proto3" json:"s_bool,omitempty"`
+	SInt32               int32                   `protobuf:"varint,2,opt,name=s_int32,json=sInt32,proto3" json:"s_int32,omitempty"`
+	SInt64               int64                   `protobuf:"varint,3,opt,name=s_int64,json=sInt64,proto3" json:"s_int64,omitempty"`
+	SUint32              uint32                  `protobuf:"varint,4,opt,name=s_uint32,json=sUint32,proto3" json:"s_uint32,omitempty"`
+	SUint64              uint64                  `protobuf:"varint,5,opt,name=s_uint64,json=sUint64,proto3" json:"s_uint64,omitempty"`
+	SSint32              int32                   `protobuf:"zigzag32,6,opt,name=s_sint32,json=sSint32,proto3" json:"s_sint32,omitempty"`
+	SSint64              int64                   `protobuf:"zigzag64,7,opt,name=s_sint64,json=sSint64,proto3" json:"s_sint64,omitempty"`
+	SFixed32             uint32                  `protobuf:"fixed32,8,opt,name=s_fixed32,json=sFixed32,proto3" json:"s_fixed32,omitempty"`
+	SFixed64             uint64                  `protobuf:"fixed64,9,opt,name=s_fixed64,json=sFixed64,proto3" json:"s_fixed64,omitempty"`
+	SSfixed32            int32                   `protobuf:"fixed32,10,opt,name=s_sfixed32,json=sSfixed32,proto3" json:"s_sfixed32,omitempty"`
+	SSfixed64            int64                   `protobuf:"fixed64,11,opt,name=s_sfixed64,json=sSfixed64,proto3" json:"s_sfixed64,omitempty"`
+	SFloat               float32                 `protobuf:"fixed32,20,opt,name=s_float,json=sFloat,proto3" json:"s_float,omitempty"`
+	SDouble              float64                 `protobuf:"fixed64,21,opt,name=s_double,json=sDouble,proto3" json:"s_double,omitempty"`
+	SBytes               []byte                  `protobuf:"bytes,14,opt,name=s_bytes,json=sBytes,proto3" json:"s_bytes,omitempty"`
+	SString              string                  `protobuf:"bytes,13,opt,name=s_string,json=sString,proto3" json:"s_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Scalars) Reset() {
@@ -249,11 +249,11 @@
 
 // Message contains enum fields.
 type Enums struct {
-	SEnum                Enum             `protobuf:"varint,1,opt,name=s_enum,json=sEnum,proto3,enum=pb3.Enum" json:"s_enum,omitempty"`
-	SNestedEnum          Enums_NestedEnum `protobuf:"varint,3,opt,name=s_nested_enum,json=sNestedEnum,proto3,enum=pb3.Enums_NestedEnum" json:"s_nested_enum,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}         `json:"-"`
-	XXX_unrecognized     []byte           `json:"-"`
-	XXX_sizecache        int32            `json:"-"`
+	SEnum                Enum                    `protobuf:"varint,1,opt,name=s_enum,json=sEnum,proto3,enum=pb3.Enum" json:"s_enum,omitempty"`
+	SNestedEnum          Enums_NestedEnum        `protobuf:"varint,3,opt,name=s_nested_enum,json=sNestedEnum,proto3,enum=pb3.Enums_NestedEnum" json:"s_nested_enum,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Enums) Reset() {
@@ -295,10 +295,10 @@
 
 // Message contains nested message field.
 type Nests struct {
-	SNested              *Nested  `protobuf:"bytes,2,opt,name=s_nested,json=sNested,proto3" json:"s_nested,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	SNested              *Nested                 `protobuf:"bytes,2,opt,name=s_nested,json=sNested,proto3" json:"s_nested,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nests) Reset() {
@@ -333,11 +333,11 @@
 
 // Message type used as submessage.
 type Nested struct {
-	SString              string   `protobuf:"bytes,1,opt,name=s_string,json=sString,proto3" json:"s_string,omitempty"`
-	SNested              *Nested  `protobuf:"bytes,2,opt,name=s_nested,json=sNested,proto3" json:"s_nested,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	SString              string                  `protobuf:"bytes,1,opt,name=s_string,json=sString,proto3" json:"s_string,omitempty"`
+	SNested              *Nested                 `protobuf:"bytes,2,opt,name=s_nested,json=sNested,proto3" json:"s_nested,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Nested) Reset() {
@@ -383,10 +383,10 @@
 	//	*Oneofs_OneofEnum
 	//	*Oneofs_OneofString
 	//	*Oneofs_OneofNested
-	Union                isOneofs_Union `protobuf_oneof:"union"`
-	XXX_NoUnkeyedLiteral struct{}       `json:"-"`
-	XXX_unrecognized     []byte         `json:"-"`
-	XXX_sizecache        int32          `json:"-"`
+	Union                isOneofs_Union          `protobuf_oneof:"union"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Oneofs) Reset() {
@@ -473,14 +473,14 @@
 
 // Message contains map fields.
 type Maps struct {
-	Int32ToStr           map[int32]string   `protobuf:"bytes,1,rep,name=int32_to_str,json=int32ToStr,proto3" json:"int32_to_str,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	BoolToUint32         map[bool]uint32    `protobuf:"bytes,2,rep,name=bool_to_uint32,json=boolToUint32,proto3" json:"bool_to_uint32,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
-	Uint64ToEnum         map[uint64]Enum    `protobuf:"bytes,3,rep,name=uint64_to_enum,json=uint64ToEnum,proto3" json:"uint64_to_enum,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3,enum=pb3.Enum"`
-	StrToNested          map[string]*Nested `protobuf:"bytes,4,rep,name=str_to_nested,json=strToNested,proto3" json:"str_to_nested,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	StrToOneofs          map[string]*Oneofs `protobuf:"bytes,5,rep,name=str_to_oneofs,json=strToOneofs,proto3" json:"str_to_oneofs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
-	XXX_unrecognized     []byte             `json:"-"`
-	XXX_sizecache        int32              `json:"-"`
+	Int32ToStr           map[int32]string        `protobuf:"bytes,1,rep,name=int32_to_str,json=int32ToStr,proto3" json:"int32_to_str,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	BoolToUint32         map[bool]uint32         `protobuf:"bytes,2,rep,name=bool_to_uint32,json=boolToUint32,proto3" json:"bool_to_uint32,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3"`
+	Uint64ToEnum         map[uint64]Enum         `protobuf:"bytes,3,rep,name=uint64_to_enum,json=uint64ToEnum,proto3" json:"uint64_to_enum,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"varint,2,opt,name=value,proto3,enum=pb3.Enum"`
+	StrToNested          map[string]*Nested      `protobuf:"bytes,4,rep,name=str_to_nested,json=strToNested,proto3" json:"str_to_nested,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	StrToOneofs          map[string]*Oneofs      `protobuf:"bytes,5,rep,name=str_to_oneofs,json=strToOneofs,proto3" json:"str_to_oneofs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Maps) Reset() {
@@ -543,10 +543,10 @@
 
 // Message for testing json_name option.
 type JSONNames struct {
-	SString              string   `protobuf:"bytes,1,opt,name=s_string,json=foo_bar,proto3" json:"s_string,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	SString              string                  `protobuf:"bytes,1,opt,name=s_string,json=foo_bar,proto3" json:"s_string,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *JSONNames) Reset() {
diff --git a/internal/testprotos/conformance/conformance.pb.go b/internal/testprotos/conformance/conformance.pb.go
index 51ea491..1bd4725 100644
--- a/internal/testprotos/conformance/conformance.pb.go
+++ b/internal/testprotos/conformance/conformance.pb.go
@@ -118,10 +118,10 @@
 // This will be known by message_type == "conformance.FailureSet", a conformance
 // test should return a serialized FailureSet in protobuf_payload.
 type FailureSet struct {
-	Failure              []string `protobuf:"bytes,1,rep,name=failure,proto3" json:"failure,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Failure              []string                `protobuf:"bytes,1,rep,name=failure,proto3" json:"failure,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FailureSet) Reset() {
@@ -186,10 +186,10 @@
 	// for more information.
 	TestCategory TestCategory `protobuf:"varint,5,opt,name=test_category,json=testCategory,proto3,enum=conformance.TestCategory" json:"test_category,omitempty"`
 	// Specify details for how to encode jspb.
-	JspbEncodingOptions  *JspbEncodingConfig `protobuf:"bytes,6,opt,name=jspb_encoding_options,json=jspbEncodingOptions,proto3" json:"jspb_encoding_options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}            `json:"-"`
-	XXX_unrecognized     []byte              `json:"-"`
-	XXX_sizecache        int32               `json:"-"`
+	JspbEncodingOptions  *JspbEncodingConfig     `protobuf:"bytes,6,opt,name=jspb_encoding_options,json=jspbEncodingOptions,proto3" json:"jspb_encoding_options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ConformanceRequest) Reset() {
@@ -351,8 +351,8 @@
 	//	*ConformanceResponse_TextPayload
 	Result               isConformanceResponse_Result `protobuf_oneof:"result"`
 	XXX_NoUnkeyedLiteral struct{}                     `json:"-"`
-	XXX_unrecognized     []byte                       `json:"-"`
-	XXX_sizecache        int32                        `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields      `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache          `json:"-"`
 }
 
 func (x *ConformanceResponse) Reset() {
@@ -510,10 +510,10 @@
 // Encoding options for jspb format.
 type JspbEncodingConfig struct {
 	// Encode the value field of Any as jspb array if ture, otherwise binary.
-	UseJspbArrayAnyFormat bool     `protobuf:"varint,1,opt,name=use_jspb_array_any_format,json=useJspbArrayAnyFormat,proto3" json:"use_jspb_array_any_format,omitempty"`
-	XXX_NoUnkeyedLiteral  struct{} `json:"-"`
-	XXX_unrecognized      []byte   `json:"-"`
-	XXX_sizecache         int32    `json:"-"`
+	UseJspbArrayAnyFormat bool                    `protobuf:"varint,1,opt,name=use_jspb_array_any_format,json=useJspbArrayAnyFormat,proto3" json:"use_jspb_array_any_format,omitempty"`
+	XXX_NoUnkeyedLiteral  struct{}                `json:"-"`
+	XXX_unrecognized      protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache         protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *JspbEncodingConfig) Reset() {
diff --git a/internal/testprotos/legacy/legacy.pb.go b/internal/testprotos/legacy/legacy.pb.go
index dfea835..cc3dbc1 100644
--- a/internal/testprotos/legacy/legacy.pb.go
+++ b/internal/testprotos/legacy/legacy.pb.go
@@ -26,21 +26,21 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type Legacy struct {
-	F1                   *proto2_v0_0.Message  `protobuf:"bytes,1,opt,name=f1,proto3" json:"f1,omitempty"`
-	F2                   *proto3_v0_0.Message  `protobuf:"bytes,2,opt,name=f2,proto3" json:"f2,omitempty"`
-	F3                   *proto2_v0_01.Message `protobuf:"bytes,3,opt,name=f3,proto3" json:"f3,omitempty"`
-	F4                   *proto3_v0_01.Message `protobuf:"bytes,4,opt,name=f4,proto3" json:"f4,omitempty"`
-	F5                   *proto2_v1_0.Message  `protobuf:"bytes,5,opt,name=f5,proto3" json:"f5,omitempty"`
-	F6                   *proto3_v1_0.Message  `protobuf:"bytes,6,opt,name=f6,proto3" json:"f6,omitempty"`
-	F7                   *proto2_v1_1.Message  `protobuf:"bytes,7,opt,name=f7,proto3" json:"f7,omitempty"`
-	F8                   *proto3_v1_1.Message  `protobuf:"bytes,8,opt,name=f8,proto3" json:"f8,omitempty"`
-	F9                   *proto2_v1_2.Message  `protobuf:"bytes,9,opt,name=f9,proto3" json:"f9,omitempty"`
-	F10                  *proto3_v1_2.Message  `protobuf:"bytes,10,opt,name=f10,proto3" json:"f10,omitempty"`
-	F11                  *proto2_v1_21.Message `protobuf:"bytes,11,opt,name=f11,proto3" json:"f11,omitempty"`
-	F12                  *proto3_v1_21.Message `protobuf:"bytes,12,opt,name=f12,proto3" json:"f12,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}              `json:"-"`
-	XXX_unrecognized     []byte                `json:"-"`
-	XXX_sizecache        int32                 `json:"-"`
+	F1                   *proto2_v0_0.Message    `protobuf:"bytes,1,opt,name=f1,proto3" json:"f1,omitempty"`
+	F2                   *proto3_v0_0.Message    `protobuf:"bytes,2,opt,name=f2,proto3" json:"f2,omitempty"`
+	F3                   *proto2_v0_01.Message   `protobuf:"bytes,3,opt,name=f3,proto3" json:"f3,omitempty"`
+	F4                   *proto3_v0_01.Message   `protobuf:"bytes,4,opt,name=f4,proto3" json:"f4,omitempty"`
+	F5                   *proto2_v1_0.Message    `protobuf:"bytes,5,opt,name=f5,proto3" json:"f5,omitempty"`
+	F6                   *proto3_v1_0.Message    `protobuf:"bytes,6,opt,name=f6,proto3" json:"f6,omitempty"`
+	F7                   *proto2_v1_1.Message    `protobuf:"bytes,7,opt,name=f7,proto3" json:"f7,omitempty"`
+	F8                   *proto3_v1_1.Message    `protobuf:"bytes,8,opt,name=f8,proto3" json:"f8,omitempty"`
+	F9                   *proto2_v1_2.Message    `protobuf:"bytes,9,opt,name=f9,proto3" json:"f9,omitempty"`
+	F10                  *proto3_v1_2.Message    `protobuf:"bytes,10,opt,name=f10,proto3" json:"f10,omitempty"`
+	F11                  *proto2_v1_21.Message   `protobuf:"bytes,11,opt,name=f11,proto3" json:"f11,omitempty"`
+	F12                  *proto3_v1_21.Message   `protobuf:"bytes,12,opt,name=f12,proto3" json:"f12,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Legacy) Reset() {
diff --git a/internal/testprotos/test/test.pb.go b/internal/testprotos/test/test.pb.go
index 6eb43c8..263dd3a 100644
--- a/internal/testprotos/test/test.pb.go
+++ b/internal/testprotos/test/test.pb.go
@@ -315,8 +315,8 @@
 	//	*TestAllTypes_OneofEnum
 	OneofField           isTestAllTypes_OneofField `protobuf_oneof:"oneof_field"`
 	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
-	XXX_unrecognized     []byte                    `json:"-"`
-	XXX_sizecache        int32                     `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *TestAllTypes) Reset() {
@@ -1058,8 +1058,8 @@
 	//	*TestDeprecatedMessage_DeprecatedOneofField
 	DeprecatedOneof      isTestDeprecatedMessage_DeprecatedOneof `protobuf_oneof:"deprecated_oneof"`
 	XXX_NoUnkeyedLiteral struct{}                                `json:"-"`
-	XXX_unrecognized     []byte                                  `json:"-"`
-	XXX_sizecache        int32                                   `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields                 `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache                     `json:"-"`
 }
 
 func (x *TestDeprecatedMessage) Reset() {
@@ -1126,11 +1126,11 @@
 func (*TestDeprecatedMessage_DeprecatedOneofField) isTestDeprecatedMessage_DeprecatedOneof() {}
 
 type ForeignMessage struct {
-	C                    *int32   `protobuf:"varint,1,opt,name=c" json:"c,omitempty"`
-	D                    *int32   `protobuf:"varint,2,opt,name=d" json:"d,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	C                    *int32                  `protobuf:"varint,1,opt,name=c" json:"c,omitempty"`
+	D                    *int32                  `protobuf:"varint,2,opt,name=d" json:"d,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ForeignMessage) Reset() {
@@ -1171,9 +1171,9 @@
 }
 
 type TestReservedFields struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestReservedFields) Reset() {
@@ -1200,10 +1200,10 @@
 }
 
 type TestAllExtensions struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *TestAllExtensions) Reset() {
@@ -1239,10 +1239,10 @@
 }
 
 type OptionalGroupExtension struct {
-	A                    *int32   `protobuf:"varint,17,opt,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,17,opt,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *OptionalGroupExtension) Reset() {
@@ -1276,10 +1276,10 @@
 }
 
 type RepeatedGroupExtension struct {
-	A                    *int32   `protobuf:"varint,47,opt,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,47,opt,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *RepeatedGroupExtension) Reset() {
@@ -1313,9 +1313,9 @@
 }
 
 type TestNestedExtension struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestNestedExtension) Reset() {
@@ -1342,10 +1342,10 @@
 }
 
 type TestRequired struct {
-	RequiredField        *int32   `protobuf:"varint,1,req,name=required_field,json=requiredField" json:"required_field,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	RequiredField        *int32                  `protobuf:"varint,1,req,name=required_field,json=requiredField" json:"required_field,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestRequired) Reset() {
@@ -1383,8 +1383,8 @@
 	RepeatedMessage      []*TestRequired         `protobuf:"bytes,2,rep,name=repeated_message,json=repeatedMessage" json:"repeated_message,omitempty"`
 	MapMessage           map[int32]*TestRequired `protobuf:"bytes,3,rep,name=map_message,json=mapMessage" json:"map_message,omitempty" protobuf_key:"varint,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
 	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
-	XXX_unrecognized     []byte                  `json:"-"`
-	XXX_sizecache        int32                   `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestRequiredForeign) Reset() {
@@ -1435,8 +1435,8 @@
 	Optionalgroup        *TestRequiredGroupFields_OptionalGroup   `protobuf:"group,1,opt,name=OptionalGroup,json=optionalgroup" json:"optionalgroup,omitempty"`
 	Repeatedgroup        []*TestRequiredGroupFields_RepeatedGroup `protobuf:"group,3,rep,name=RepeatedGroup,json=repeatedgroup" json:"repeatedgroup,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                                 `json:"-"`
-	XXX_unrecognized     []byte                                   `json:"-"`
-	XXX_sizecache        int32                                    `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields                  `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache                      `json:"-"`
 }
 
 func (x *TestRequiredGroupFields) Reset() {
@@ -1478,9 +1478,9 @@
 
 // Test that RPC services work.
 type FooRequest struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FooRequest) Reset() {
@@ -1507,9 +1507,9 @@
 }
 
 type FooResponse struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FooResponse) Reset() {
@@ -1536,11 +1536,11 @@
 }
 
 type TestAllTypes_NestedMessage struct {
-	A                    *int32        `protobuf:"varint,1,opt,name=a" json:"a,omitempty"`
-	Corecursive          *TestAllTypes `protobuf:"bytes,2,opt,name=corecursive" json:"corecursive,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
-	XXX_unrecognized     []byte        `json:"-"`
-	XXX_sizecache        int32         `json:"-"`
+	A                    *int32                  `protobuf:"varint,1,opt,name=a" json:"a,omitempty"`
+	Corecursive          *TestAllTypes           `protobuf:"bytes,2,opt,name=corecursive" json:"corecursive,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestAllTypes_NestedMessage) Reset() {
@@ -1581,10 +1581,10 @@
 }
 
 type TestAllTypes_OptionalGroup struct {
-	A                    *int32   `protobuf:"varint,17,opt,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,17,opt,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestAllTypes_OptionalGroup) Reset() {
@@ -1618,10 +1618,10 @@
 }
 
 type TestAllTypes_RepeatedGroup struct {
-	A                    *int32   `protobuf:"varint,47,opt,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,47,opt,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestAllTypes_RepeatedGroup) Reset() {
@@ -1655,10 +1655,10 @@
 }
 
 type TestRequiredGroupFields_OptionalGroup struct {
-	A                    *int32   `protobuf:"varint,2,req,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,2,req,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestRequiredGroupFields_OptionalGroup) Reset() {
@@ -1692,10 +1692,10 @@
 }
 
 type TestRequiredGroupFields_RepeatedGroup struct {
-	A                    *int32   `protobuf:"varint,4,req,name=a" json:"a,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	A                    *int32                  `protobuf:"varint,4,req,name=a" json:"a,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestRequiredGroupFields_RepeatedGroup) Reset() {
diff --git a/internal/testprotos/test/test_import.pb.go b/internal/testprotos/test/test_import.pb.go
index eb889ee..3b9766f 100644
--- a/internal/testprotos/test/test_import.pb.go
+++ b/internal/testprotos/test/test_import.pb.go
@@ -63,9 +63,9 @@
 }
 
 type ImportMessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ImportMessage) Reset() {
diff --git a/internal/testprotos/test/test_public.pb.go b/internal/testprotos/test/test_public.pb.go
index 7132a4b..4f12706 100644
--- a/internal/testprotos/test/test_public.pb.go
+++ b/internal/testprotos/test/test_public.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type PublicImportMessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *PublicImportMessage) Reset() {
diff --git a/internal/testprotos/test/test_weak.pb.go b/internal/testprotos/test/test_weak.pb.go
index b36082b..0a716ef 100644
--- a/internal/testprotos/test/test_weak.pb.go
+++ b/internal/testprotos/test/test_weak.pb.go
@@ -14,9 +14,9 @@
 const _ = protoimpl.EnforceVersion(protoimpl.Version - 0)
 
 type WeakImportMessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *WeakImportMessage) Reset() {
diff --git a/internal/testprotos/test3/test.pb.go b/internal/testprotos/test3/test.pb.go
index d2d2a61..d871a2e 100644
--- a/internal/testprotos/test3/test.pb.go
+++ b/internal/testprotos/test3/test.pb.go
@@ -169,8 +169,8 @@
 	//	*TestAllTypes_OneofEnum
 	OneofField           isTestAllTypes_OneofField `protobuf_oneof:"oneof_field"`
 	XXX_NoUnkeyedLiteral struct{}                  `json:"-"`
-	XXX_unrecognized     []byte                    `json:"-"`
-	XXX_sizecache        int32                     `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *TestAllTypes) Reset() {
@@ -753,11 +753,11 @@
 func (*TestAllTypes_OneofEnum) isTestAllTypes_OneofField() {}
 
 type ForeignMessage struct {
-	C                    int32    `protobuf:"varint,1,opt,name=c,proto3" json:"c,omitempty"`
-	D                    int32    `protobuf:"varint,2,opt,name=d,proto3" json:"d,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	C                    int32                   `protobuf:"varint,1,opt,name=c,proto3" json:"c,omitempty"`
+	D                    int32                   `protobuf:"varint,2,opt,name=d,proto3" json:"d,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ForeignMessage) Reset() {
@@ -798,11 +798,11 @@
 }
 
 type TestAllTypes_NestedMessage struct {
-	A                    int32         `protobuf:"varint,1,opt,name=a,proto3" json:"a,omitempty"`
-	Corecursive          *TestAllTypes `protobuf:"bytes,2,opt,name=corecursive,proto3" json:"corecursive,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
-	XXX_unrecognized     []byte        `json:"-"`
-	XXX_sizecache        int32         `json:"-"`
+	A                    int32                   `protobuf:"varint,1,opt,name=a,proto3" json:"a,omitempty"`
+	Corecursive          *TestAllTypes           `protobuf:"bytes,2,opt,name=corecursive,proto3" json:"corecursive,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *TestAllTypes_NestedMessage) Reset() {
diff --git a/internal/testprotos/test3/test_import.pb.go b/internal/testprotos/test3/test_import.pb.go
index 2ee6535..385827b 100644
--- a/internal/testprotos/test3/test_import.pb.go
+++ b/internal/testprotos/test3/test_import.pb.go
@@ -47,9 +47,9 @@
 }
 
 type ImportMessage struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ImportMessage) Reset() {
diff --git a/reflect/protoregistry/testprotos/test.pb.go b/reflect/protoregistry/testprotos/test.pb.go
index 6ba10ad..435b8b0 100644
--- a/reflect/protoregistry/testprotos/test.pb.go
+++ b/reflect/protoregistry/testprotos/test.pb.go
@@ -161,10 +161,10 @@
 }
 
 type Message1 struct {
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *Message1) Reset() {
@@ -200,9 +200,9 @@
 }
 
 type Message2 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message2) Reset() {
@@ -229,9 +229,9 @@
 }
 
 type Message3 struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message3) Reset() {
@@ -258,10 +258,10 @@
 }
 
 type Message4 struct {
-	BoolField            *bool    `protobuf:"varint,30,opt,name=bool_field,json=boolField" json:"bool_field,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	BoolField            *bool                   `protobuf:"varint,30,opt,name=bool_field,json=boolField" json:"bool_field,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Message4) Reset() {
diff --git a/runtime/protoimpl/impl.go b/runtime/protoimpl/impl.go
index 3c20296..bbfab27 100644
--- a/runtime/protoimpl/impl.go
+++ b/runtime/protoimpl/impl.go
@@ -41,6 +41,11 @@
 	MessageType = impl.MessageType
 	FileBuilder = fileinit.FileBuilder
 
+	// TODO: Change these to more efficient data structures.
+	ExtensionFields = map[int32]impl.ExtensionFieldV1
+	UnknownFields   = []byte
+	SizeCache       = int32
+
 	ExtensionFieldV1  = impl.ExtensionFieldV1
 	ExtensionFieldsV1 = impl.ExtensionFieldsV1
 )
diff --git a/types/descriptor/descriptor.pb.go b/types/descriptor/descriptor.pb.go
index bab8795..bcddc8e 100644
--- a/types/descriptor/descriptor.pb.go
+++ b/types/descriptor/descriptor.pb.go
@@ -412,10 +412,10 @@
 // The protocol compiler can output a FileDescriptorSet containing the .proto
 // files it parses.
 type FileDescriptorSet struct {
-	File                 []*FileDescriptorProto `protobuf:"bytes,1,rep,name=file" json:"file,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}               `json:"-"`
-	XXX_unrecognized     []byte                 `json:"-"`
-	XXX_sizecache        int32                  `json:"-"`
+	File                 []*FileDescriptorProto  `protobuf:"bytes,1,rep,name=file" json:"file,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FileDescriptorSet) Reset() {
@@ -472,10 +472,10 @@
 	SourceCodeInfo *SourceCodeInfo `protobuf:"bytes,9,opt,name=source_code_info,json=sourceCodeInfo" json:"source_code_info,omitempty"`
 	// The syntax of the proto file.
 	// The supported values are "proto2" and "proto3".
-	Syntax               *string  `protobuf:"bytes,12,opt,name=syntax" json:"syntax,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Syntax               *string                 `protobuf:"bytes,12,opt,name=syntax" json:"syntax,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FileDescriptorProto) Reset() {
@@ -598,10 +598,10 @@
 	ReservedRange  []*DescriptorProto_ReservedRange  `protobuf:"bytes,9,rep,name=reserved_range,json=reservedRange" json:"reserved_range,omitempty"`
 	// Reserved field names, which may not be used by fields in the same message.
 	// A given name may only be reserved once.
-	ReservedName         []string `protobuf:"bytes,10,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ReservedName         []string                `protobuf:"bytes,10,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *DescriptorProto) Reset() {
@@ -699,11 +699,11 @@
 
 type ExtensionRangeOptions struct {
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *ExtensionRangeOptions) Reset() {
@@ -775,11 +775,11 @@
 	// user has set a "json_name" option on this field, that option's value
 	// will be used. Otherwise, it's deduced from the field's name by converting
 	// it to camelCase.
-	JsonName             *string       `protobuf:"bytes,10,opt,name=json_name,json=jsonName" json:"json_name,omitempty"`
-	Options              *FieldOptions `protobuf:"bytes,8,opt,name=options" json:"options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
-	XXX_unrecognized     []byte        `json:"-"`
-	XXX_sizecache        int32         `json:"-"`
+	JsonName             *string                 `protobuf:"bytes,10,opt,name=json_name,json=jsonName" json:"json_name,omitempty"`
+	Options              *FieldOptions           `protobuf:"bytes,8,opt,name=options" json:"options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldDescriptorProto) Reset() {
@@ -877,11 +877,11 @@
 
 // Describes a oneof.
 type OneofDescriptorProto struct {
-	Name                 *string       `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
-	Options              *OneofOptions `protobuf:"bytes,2,opt,name=options" json:"options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
-	XXX_unrecognized     []byte        `json:"-"`
-	XXX_sizecache        int32         `json:"-"`
+	Name                 *string                 `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Options              *OneofOptions           `protobuf:"bytes,2,opt,name=options" json:"options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *OneofDescriptorProto) Reset() {
@@ -932,10 +932,10 @@
 	ReservedRange []*EnumDescriptorProto_EnumReservedRange `protobuf:"bytes,4,rep,name=reserved_range,json=reservedRange" json:"reserved_range,omitempty"`
 	// Reserved enum value names, which may not be reused. A given name may only
 	// be reserved once.
-	ReservedName         []string `protobuf:"bytes,5,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ReservedName         []string                `protobuf:"bytes,5,rep,name=reserved_name,json=reservedName" json:"reserved_name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumDescriptorProto) Reset() {
@@ -998,12 +998,12 @@
 
 // Describes a value within an enum.
 type EnumValueDescriptorProto struct {
-	Name                 *string           `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
-	Number               *int32            `protobuf:"varint,2,opt,name=number" json:"number,omitempty"`
-	Options              *EnumValueOptions `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
+	Name                 *string                 `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Number               *int32                  `protobuf:"varint,2,opt,name=number" json:"number,omitempty"`
+	Options              *EnumValueOptions       `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumValueDescriptorProto) Reset() {
@@ -1056,8 +1056,8 @@
 	Method               []*MethodDescriptorProto `protobuf:"bytes,2,rep,name=method" json:"method,omitempty"`
 	Options              *ServiceOptions          `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                 `json:"-"`
-	XXX_unrecognized     []byte                   `json:"-"`
-	XXX_sizecache        int32                    `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields  `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache      `json:"-"`
 }
 
 func (x *ServiceDescriptorProto) Reset() {
@@ -1115,10 +1115,10 @@
 	// Identifies if client streams multiple client messages
 	ClientStreaming *bool `protobuf:"varint,5,opt,name=client_streaming,json=clientStreaming,def=0" json:"client_streaming,omitempty"`
 	// Identifies if server streams multiple server messages
-	ServerStreaming      *bool    `protobuf:"varint,6,opt,name=server_streaming,json=serverStreaming,def=0" json:"server_streaming,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	ServerStreaming      *bool                   `protobuf:"varint,6,opt,name=server_streaming,json=serverStreaming,def=0" json:"server_streaming,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *MethodDescriptorProto) Reset() {
@@ -1273,11 +1273,11 @@
 	RubyPackage *string `protobuf:"bytes,45,opt,name=ruby_package,json=rubyPackage" json:"ruby_package,omitempty"`
 	// The parser stores options it doesn't recognize here.
 	// See the documentation for the "Options" section above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *FileOptions) Reset() {
@@ -1522,11 +1522,11 @@
 	// parser.
 	MapEntry *bool `protobuf:"varint,7,opt,name=map_entry,json=mapEntry" json:"map_entry,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *MessageOptions) Reset() {
@@ -1661,11 +1661,11 @@
 	// For Google-internal migration only. Do not use.
 	Weak *bool `protobuf:"varint,10,opt,name=weak,def=0" json:"weak,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *FieldOptions) Reset() {
@@ -1757,11 +1757,11 @@
 
 type OneofOptions struct {
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *OneofOptions) Reset() {
@@ -1813,11 +1813,11 @@
 	// is a formalization for deprecating enums.
 	Deprecated *bool `protobuf:"varint,3,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *EnumOptions) Reset() {
@@ -1882,11 +1882,11 @@
 	// this is a formalization for deprecating enum values.
 	Deprecated *bool `protobuf:"varint,1,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *EnumValueOptions) Reset() {
@@ -1944,11 +1944,11 @@
 	// this is a formalization for deprecating services.
 	Deprecated *bool `protobuf:"varint,33,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *ServiceOptions) Reset() {
@@ -2007,11 +2007,11 @@
 	Deprecated       *bool                           `protobuf:"varint,33,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
 	IdempotencyLevel *MethodOptions_IdempotencyLevel `protobuf:"varint,34,opt,name=idempotency_level,json=idempotencyLevel,enum=google.protobuf.MethodOptions_IdempotencyLevel,def=0" json:"idempotency_level,omitempty"`
 	// The parser stores options it doesn't recognize here. See above.
-	UninterpretedOption    []*UninterpretedOption      `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
-	XXX_NoUnkeyedLiteral   struct{}                    `json:"-"`
-	XXX_InternalExtensions protoimpl.ExtensionFieldsV1 `json:"-"`
-	XXX_unrecognized       []byte                      `json:"-"`
-	XXX_sizecache          int32                       `json:"-"`
+	UninterpretedOption    []*UninterpretedOption    `protobuf:"bytes,999,rep,name=uninterpreted_option,json=uninterpretedOption" json:"uninterpreted_option,omitempty"`
+	XXX_NoUnkeyedLiteral   struct{}                  `json:"-"`
+	XXX_InternalExtensions protoimpl.ExtensionFields `json:"-"`
+	XXX_unrecognized       protoimpl.UnknownFields   `json:"-"`
+	XXX_sizecache          protoimpl.SizeCache       `json:"-"`
 }
 
 func (x *MethodOptions) Reset() {
@@ -2080,15 +2080,15 @@
 	Name []*UninterpretedOption_NamePart `protobuf:"bytes,2,rep,name=name" json:"name,omitempty"`
 	// The value of the uninterpreted option, in whatever type the tokenizer
 	// identified it as during parsing. Exactly one of these should be set.
-	IdentifierValue      *string  `protobuf:"bytes,3,opt,name=identifier_value,json=identifierValue" json:"identifier_value,omitempty"`
-	PositiveIntValue     *uint64  `protobuf:"varint,4,opt,name=positive_int_value,json=positiveIntValue" json:"positive_int_value,omitempty"`
-	NegativeIntValue     *int64   `protobuf:"varint,5,opt,name=negative_int_value,json=negativeIntValue" json:"negative_int_value,omitempty"`
-	DoubleValue          *float64 `protobuf:"fixed64,6,opt,name=double_value,json=doubleValue" json:"double_value,omitempty"`
-	StringValue          []byte   `protobuf:"bytes,7,opt,name=string_value,json=stringValue" json:"string_value,omitempty"`
-	AggregateValue       *string  `protobuf:"bytes,8,opt,name=aggregate_value,json=aggregateValue" json:"aggregate_value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	IdentifierValue      *string                 `protobuf:"bytes,3,opt,name=identifier_value,json=identifierValue" json:"identifier_value,omitempty"`
+	PositiveIntValue     *uint64                 `protobuf:"varint,4,opt,name=positive_int_value,json=positiveIntValue" json:"positive_int_value,omitempty"`
+	NegativeIntValue     *int64                  `protobuf:"varint,5,opt,name=negative_int_value,json=negativeIntValue" json:"negative_int_value,omitempty"`
+	DoubleValue          *float64                `protobuf:"fixed64,6,opt,name=double_value,json=doubleValue" json:"double_value,omitempty"`
+	StringValue          []byte                  `protobuf:"bytes,7,opt,name=string_value,json=stringValue" json:"string_value,omitempty"`
+	AggregateValue       *string                 `protobuf:"bytes,8,opt,name=aggregate_value,json=aggregateValue" json:"aggregate_value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *UninterpretedOption) Reset() {
@@ -2211,8 +2211,8 @@
 	//   be recorded in the future.
 	Location             []*SourceCodeInfo_Location `protobuf:"bytes,1,rep,name=location" json:"location,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                   `json:"-"`
-	XXX_unrecognized     []byte                     `json:"-"`
-	XXX_sizecache        int32                      `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields    `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache        `json:"-"`
 }
 
 func (x *SourceCodeInfo) Reset() {
@@ -2253,8 +2253,8 @@
 	// of its generating .proto file.
 	Annotation           []*GeneratedCodeInfo_Annotation `protobuf:"bytes,1,rep,name=annotation" json:"annotation,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                        `json:"-"`
-	XXX_unrecognized     []byte                          `json:"-"`
-	XXX_sizecache        int32                           `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields         `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache             `json:"-"`
 }
 
 func (x *GeneratedCodeInfo) Reset() {
@@ -2288,12 +2288,12 @@
 }
 
 type DescriptorProto_ExtensionRange struct {
-	Start                *int32                 `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
-	End                  *int32                 `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
-	Options              *ExtensionRangeOptions `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}               `json:"-"`
-	XXX_unrecognized     []byte                 `json:"-"`
-	XXX_sizecache        int32                  `json:"-"`
+	Start                *int32                  `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
+	End                  *int32                  `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
+	Options              *ExtensionRangeOptions  `protobuf:"bytes,3,opt,name=options" json:"options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *DescriptorProto_ExtensionRange) Reset() {
@@ -2344,11 +2344,11 @@
 // fields or extension ranges in the same message. Reserved ranges may
 // not overlap.
 type DescriptorProto_ReservedRange struct {
-	Start                *int32   `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
-	End                  *int32   `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Start                *int32                  `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
+	End                  *int32                  `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *DescriptorProto_ReservedRange) Reset() {
@@ -2395,11 +2395,11 @@
 // is inclusive such that it can appropriately represent the entire int32
 // domain.
 type EnumDescriptorProto_EnumReservedRange struct {
-	Start                *int32   `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
-	End                  *int32   `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Start                *int32                  `protobuf:"varint,1,opt,name=start" json:"start,omitempty"`
+	End                  *int32                  `protobuf:"varint,2,opt,name=end" json:"end,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumDescriptorProto_EnumReservedRange) Reset() {
@@ -2445,11 +2445,11 @@
 // E.g.,{ ["foo", false], ["bar.baz", true], ["qux", false] } represents
 // "foo.(bar.baz).qux".
 type UninterpretedOption_NamePart struct {
-	NamePart             *string  `protobuf:"bytes,1,req,name=name_part,json=namePart" json:"name_part,omitempty"`
-	IsExtension          *bool    `protobuf:"varint,2,req,name=is_extension,json=isExtension" json:"is_extension,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	NamePart             *string                 `protobuf:"bytes,1,req,name=name_part,json=namePart" json:"name_part,omitempty"`
+	IsExtension          *bool                   `protobuf:"varint,2,req,name=is_extension,json=isExtension" json:"is_extension,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *UninterpretedOption_NamePart) Reset() {
@@ -2567,12 +2567,12 @@
 	//   optional int32 grault = 6;
 	//
 	//   // ignored detached comments.
-	LeadingComments         *string  `protobuf:"bytes,3,opt,name=leading_comments,json=leadingComments" json:"leading_comments,omitempty"`
-	TrailingComments        *string  `protobuf:"bytes,4,opt,name=trailing_comments,json=trailingComments" json:"trailing_comments,omitempty"`
-	LeadingDetachedComments []string `protobuf:"bytes,6,rep,name=leading_detached_comments,json=leadingDetachedComments" json:"leading_detached_comments,omitempty"`
-	XXX_NoUnkeyedLiteral    struct{} `json:"-"`
-	XXX_unrecognized        []byte   `json:"-"`
-	XXX_sizecache           int32    `json:"-"`
+	LeadingComments         *string                 `protobuf:"bytes,3,opt,name=leading_comments,json=leadingComments" json:"leading_comments,omitempty"`
+	TrailingComments        *string                 `protobuf:"bytes,4,opt,name=trailing_comments,json=trailingComments" json:"trailing_comments,omitempty"`
+	LeadingDetachedComments []string                `protobuf:"bytes,6,rep,name=leading_detached_comments,json=leadingDetachedComments" json:"leading_detached_comments,omitempty"`
+	XXX_NoUnkeyedLiteral    struct{}                `json:"-"`
+	XXX_unrecognized        protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache           protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *SourceCodeInfo_Location) Reset() {
@@ -2645,10 +2645,10 @@
 	// Identifies the ending offset in bytes in the generated code that
 	// relates to the identified offset. The end offset should be one past
 	// the last relevant byte (so the length of the text = end - begin).
-	End                  *int32   `protobuf:"varint,4,opt,name=end" json:"end,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	End                  *int32                  `protobuf:"varint,4,opt,name=end" json:"end,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *GeneratedCodeInfo_Annotation) Reset() {
diff --git a/types/known/any.pb.go b/types/known/any.pb.go
index ca5b5bd..ee1396c 100644
--- a/types/known/any.pb.go
+++ b/types/known/any.pb.go
@@ -124,10 +124,10 @@
 	//
 	TypeUrl string `protobuf:"bytes,1,opt,name=type_url,json=typeUrl,proto3" json:"type_url,omitempty"`
 	// Must be a valid serialized protocol buffer of the above specified type.
-	Value                []byte   `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                []byte                  `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Any) Reset() {
diff --git a/types/known/api.pb.go b/types/known/api.pb.go
index 1098672..cdd0563 100644
--- a/types/known/api.pb.go
+++ b/types/known/api.pb.go
@@ -58,10 +58,10 @@
 	// Included interfaces. See [Mixin][].
 	Mixins []*Mixin `protobuf:"bytes,6,rep,name=mixins,proto3" json:"mixins,omitempty"`
 	// The source syntax of the service.
-	Syntax               Syntax   `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Syntax               Syntax                  `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Api) Reset() {
@@ -151,10 +151,10 @@
 	// Any metadata attached to the method.
 	Options []*Option `protobuf:"bytes,6,rep,name=options,proto3" json:"options,omitempty"`
 	// The source syntax of this method.
-	Syntax               Syntax   `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Syntax               Syntax                  `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Method) Reset() {
@@ -312,10 +312,10 @@
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
 	// If non-empty specifies a path under which inherited HTTP paths
 	// are rooted.
-	Root                 string   `protobuf:"bytes,2,opt,name=root,proto3" json:"root,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Root                 string                  `protobuf:"bytes,2,opt,name=root,proto3" json:"root,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Mixin) Reset() {
diff --git a/types/known/duration.pb.go b/types/known/duration.pb.go
index fefa77e..2783593 100644
--- a/types/known/duration.pb.go
+++ b/types/known/duration.pb.go
@@ -84,10 +84,10 @@
 	// of one second or more, a non-zero value for the `nanos` field must be
 	// of the same sign as the `seconds` field. Must be from -999,999,999
 	// to +999,999,999 inclusive.
-	Nanos                int32    `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Nanos                int32                   `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Duration) Reset() {
diff --git a/types/known/empty.pb.go b/types/known/empty.pb.go
index dab3c11..3b1a662 100644
--- a/types/known/empty.pb.go
+++ b/types/known/empty.pb.go
@@ -23,9 +23,9 @@
 //
 // The JSON representation for `Empty` is empty JSON object `{}`.
 type Empty struct {
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Empty) Reset() {
diff --git a/types/known/field_mask.pb.go b/types/known/field_mask.pb.go
index 6a6d36d..3174b91 100644
--- a/types/known/field_mask.pb.go
+++ b/types/known/field_mask.pb.go
@@ -214,10 +214,10 @@
 // `INVALID_ARGUMENT` error if any path is duplicated or unmappable.
 type FieldMask struct {
 	// The set of field mask paths.
-	Paths                []string `protobuf:"bytes,1,rep,name=paths,proto3" json:"paths,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Paths                []string                `protobuf:"bytes,1,rep,name=paths,proto3" json:"paths,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FieldMask) Reset() {
diff --git a/types/known/source_context.pb.go b/types/known/source_context.pb.go
index f00d77d..5538d09 100644
--- a/types/known/source_context.pb.go
+++ b/types/known/source_context.pb.go
@@ -18,10 +18,10 @@
 type SourceContext struct {
 	// The path-qualified name of the .proto file that contained the associated
 	// protobuf element.  For example: `"google/protobuf/source_context.proto"`.
-	FileName             string   `protobuf:"bytes,1,opt,name=file_name,json=fileName,proto3" json:"file_name,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	FileName             string                  `protobuf:"bytes,1,opt,name=file_name,json=fileName,proto3" json:"file_name,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *SourceContext) Reset() {
diff --git a/types/known/struct.pb.go b/types/known/struct.pb.go
index 72af036..f5c876e 100644
--- a/types/known/struct.pb.go
+++ b/types/known/struct.pb.go
@@ -63,10 +63,10 @@
 // The JSON representation for `Struct` is JSON object.
 type Struct struct {
 	// Unordered map of dynamically typed values.
-	Fields               map[string]*Value `protobuf:"bytes,1,rep,name=fields,proto3" json:"fields,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
+	Fields               map[string]*Value       `protobuf:"bytes,1,rep,name=fields,proto3" json:"fields,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Struct) Reset() {
@@ -123,10 +123,10 @@
 	//	*Value_StructValue
 	// Represents a repeated `Value`.
 	//	*Value_ListValue
-	Kind                 isValue_Kind `protobuf_oneof:"kind"`
-	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
-	XXX_unrecognized     []byte       `json:"-"`
-	XXX_sizecache        int32        `json:"-"`
+	Kind                 isValue_Kind            `protobuf_oneof:"kind"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Value) Reset() {
@@ -260,10 +260,10 @@
 // The JSON representation for `ListValue` is JSON array.
 type ListValue struct {
 	// Repeated field of dynamically typed values.
-	Values               []*Value `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Values               []*Value                `protobuf:"bytes,1,rep,name=values,proto3" json:"values,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *ListValue) Reset() {
diff --git a/types/known/timestamp.pb.go b/types/known/timestamp.pb.go
index 71fcc74..3201e48 100644
--- a/types/known/timestamp.pb.go
+++ b/types/known/timestamp.pb.go
@@ -104,10 +104,10 @@
 	// second values with fractions must still have non-negative nanos values
 	// that count forward in time. Must be from 0 to 999,999,999
 	// inclusive.
-	Nanos                int32    `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Nanos                int32                   `protobuf:"varint,2,opt,name=nanos,proto3" json:"nanos,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Timestamp) Reset() {
diff --git a/types/known/type.pb.go b/types/known/type.pb.go
index ec25db5..b3b1ba2 100644
--- a/types/known/type.pb.go
+++ b/types/known/type.pb.go
@@ -219,10 +219,10 @@
 	// The source context.
 	SourceContext *SourceContext `protobuf:"bytes,5,opt,name=source_context,json=sourceContext,proto3" json:"source_context,omitempty"`
 	// The source syntax.
-	Syntax               Syntax   `protobuf:"varint,6,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Syntax               Syntax                  `protobuf:"varint,6,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Type) Reset() {
@@ -313,10 +313,10 @@
 	// The field JSON name.
 	JsonName string `protobuf:"bytes,10,opt,name=json_name,json=jsonName,proto3" json:"json_name,omitempty"`
 	// The string value of the default value of this field. Proto2 syntax only.
-	DefaultValue         string   `protobuf:"bytes,11,opt,name=default_value,json=defaultValue,proto3" json:"default_value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	DefaultValue         string                  `protobuf:"bytes,11,opt,name=default_value,json=defaultValue,proto3" json:"default_value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Field) Reset() {
@@ -423,10 +423,10 @@
 	// The source context.
 	SourceContext *SourceContext `protobuf:"bytes,4,opt,name=source_context,json=sourceContext,proto3" json:"source_context,omitempty"`
 	// The source syntax.
-	Syntax               Syntax   `protobuf:"varint,5,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Syntax               Syntax                  `protobuf:"varint,5,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Enum) Reset() {
@@ -494,10 +494,10 @@
 	// Enum value number.
 	Number int32 `protobuf:"varint,2,opt,name=number,proto3" json:"number,omitempty"`
 	// Protocol buffer options.
-	Options              []*Option `protobuf:"bytes,3,rep,name=options,proto3" json:"options,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
-	XXX_unrecognized     []byte    `json:"-"`
-	XXX_sizecache        int32     `json:"-"`
+	Options              []*Option               `protobuf:"bytes,3,rep,name=options,proto3" json:"options,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *EnumValue) Reset() {
@@ -556,10 +556,10 @@
 	// the corresponding wrapper type defined in google/protobuf/wrappers.proto
 	// should be used. If the value is an enum, it should be stored as an int32
 	// value using the google.protobuf.Int32Value type.
-	Value                *Any     `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                *Any                    `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Option) Reset() {
diff --git a/types/known/wrappers.pb.go b/types/known/wrappers.pb.go
index da81920..143bd9c 100644
--- a/types/known/wrappers.pb.go
+++ b/types/known/wrappers.pb.go
@@ -18,10 +18,10 @@
 // The JSON representation for `DoubleValue` is JSON number.
 type DoubleValue struct {
 	// The double value.
-	Value                float64  `protobuf:"fixed64,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                float64                 `protobuf:"fixed64,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *DoubleValue) Reset() {
@@ -61,10 +61,10 @@
 // The JSON representation for `FloatValue` is JSON number.
 type FloatValue struct {
 	// The float value.
-	Value                float32  `protobuf:"fixed32,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                float32                 `protobuf:"fixed32,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *FloatValue) Reset() {
@@ -104,10 +104,10 @@
 // The JSON representation for `Int64Value` is JSON string.
 type Int64Value struct {
 	// The int64 value.
-	Value                int64    `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                int64                   `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Int64Value) Reset() {
@@ -147,10 +147,10 @@
 // The JSON representation for `UInt64Value` is JSON string.
 type UInt64Value struct {
 	// The uint64 value.
-	Value                uint64   `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                uint64                  `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *UInt64Value) Reset() {
@@ -190,10 +190,10 @@
 // The JSON representation for `Int32Value` is JSON number.
 type Int32Value struct {
 	// The int32 value.
-	Value                int32    `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                int32                   `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Int32Value) Reset() {
@@ -233,10 +233,10 @@
 // The JSON representation for `UInt32Value` is JSON number.
 type UInt32Value struct {
 	// The uint32 value.
-	Value                uint32   `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                uint32                  `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *UInt32Value) Reset() {
@@ -276,10 +276,10 @@
 // The JSON representation for `BoolValue` is JSON `true` and `false`.
 type BoolValue struct {
 	// The bool value.
-	Value                bool     `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                bool                    `protobuf:"varint,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *BoolValue) Reset() {
@@ -319,10 +319,10 @@
 // The JSON representation for `StringValue` is JSON string.
 type StringValue struct {
 	// The string value.
-	Value                string   `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                string                  `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *StringValue) Reset() {
@@ -362,10 +362,10 @@
 // The JSON representation for `BytesValue` is JSON string.
 type BytesValue struct {
 	// The bytes value.
-	Value                []byte   `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Value                []byte                  `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *BytesValue) Reset() {
diff --git a/types/plugin/plugin.pb.go b/types/plugin/plugin.pb.go
index 4a31517..e7606d5 100644
--- a/types/plugin/plugin.pb.go
+++ b/types/plugin/plugin.pb.go
@@ -21,10 +21,10 @@
 	Patch *int32 `protobuf:"varint,3,opt,name=patch" json:"patch,omitempty"`
 	// A suffix for alpha, beta or rc release, e.g., "alpha-1", "rc2". It should
 	// be empty for mainline stable releases.
-	Suffix               *string  `protobuf:"bytes,4,opt,name=suffix" json:"suffix,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Suffix               *string                 `protobuf:"bytes,4,opt,name=suffix" json:"suffix,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *Version) Reset() {
@@ -102,10 +102,10 @@
 	// fully qualified.
 	ProtoFile []*descriptor.FileDescriptorProto `protobuf:"bytes,15,rep,name=proto_file,json=protoFile" json:"proto_file,omitempty"`
 	// The version number of protocol compiler.
-	CompilerVersion      *Version `protobuf:"bytes,3,opt,name=compiler_version,json=compilerVersion" json:"compiler_version,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	CompilerVersion      *Version                `protobuf:"bytes,3,opt,name=compiler_version,json=compilerVersion" json:"compiler_version,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *CodeGeneratorRequest) Reset() {
@@ -172,8 +172,8 @@
 	Error                *string                       `protobuf:"bytes,1,opt,name=error" json:"error,omitempty"`
 	File                 []*CodeGeneratorResponse_File `protobuf:"bytes,15,rep,name=file" json:"file,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                      `json:"-"`
-	XXX_unrecognized     []byte                        `json:"-"`
-	XXX_sizecache        int32                         `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields       `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache           `json:"-"`
 }
 
 func (x *CodeGeneratorResponse) Reset() {
@@ -266,10 +266,10 @@
 	// If |insertion_point| is present, |name| must also be present.
 	InsertionPoint *string `protobuf:"bytes,2,opt,name=insertion_point,json=insertionPoint" json:"insertion_point,omitempty"`
 	// The file contents.
-	Content              *string  `protobuf:"bytes,15,opt,name=content" json:"content,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	Content              *string                 `protobuf:"bytes,15,opt,name=content" json:"content,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}                `json:"-"`
+	XXX_unrecognized     protoimpl.UnknownFields `json:"-"`
+	XXX_sizecache        protoimpl.SizeCache     `json:"-"`
 }
 
 func (x *CodeGeneratorResponse_File) Reset() {