move well-known types (#372)

This is step 3 of 6 in a multi-stage migration
to move the well-known types
from the google.golang.org/genproto module
to the google.golang.org/protobuf module.

The generated Go packages for field_mask.proto, api.proto,
type.proto, and source_context.proto are being moved over
to this module alongside all the other well-known types.

In order to move these types between two modules,
there needs to be a sequence of changes submitted in
decently rapid succession. It is impossible to atomically
make these changes, so a brief breakage is inevitable.
The steps are as follows:

Step 1: Submit a change to cloud.google.com/go/internal/gapicgen
to avoid generating the well-known types. Otherwise, the tool
will undo the changes made in step 3.
See https://code-review.googlesource.com/c/gocloud/+/56810

Step 2: Submit a change to google.golang.org/protobuf that
adds the generated well-known types being migrated to that module.
In order to prevent the situation where a user links in
too old a version of the genproto module such that
duplicate registration occurs for the well-known types,
the registry is specially modified to provide an error
message that instructs users to upgrade the genproto module.
See https://golang.org/cl/234937

Step 3: Submit a change to google.golang.org/genproto that
switches all generated well-known types to be aliases to the
ones declared in google.golang.org/protobuf from the previous step.
This will cause the genproto module to incur an dependency
on an unreleased version of the protobuf module.
See https://github.com/googleapis/go-genproto/pull/372

Step 4: Submit a change to google.golang.org/protobuf that
adds a weak module depdency on the genproto module at the
revision from the previous step.

Step 5: Release google.golang.org/protobuf@v1.24.0.

Step 6: Submit a change to google.golang.org/genproto that
updates the protobuf module dependency to v1.24.0.
diff --git a/go.mod b/go.mod
index ec82b25..224abbe 100644
--- a/go.mod
+++ b/go.mod
@@ -7,6 +7,6 @@
 	golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3
 	golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135
 	google.golang.org/grpc v1.27.0
-	google.golang.org/protobuf v1.22.0
+	google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc
 	honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc
 )
diff --git a/go.sum b/go.sum
index 051b143..0c51e15 100644
--- a/go.sum
+++ b/go.sum
@@ -8,19 +8,15 @@
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
 github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
-github.com/golang/protobuf v1.4.0 h1:oOuy+ugB+P/kBdUnG5QaMXSIyJ1q38wWSojYCb3z5VQ=
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.1 h1:ZFgWrT+bLgsYPirOnRfKLYJLvssAegOj/hgyMFdJZe0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
-github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
@@ -30,29 +26,24 @@
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
-golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961 h1:GmgasJE571dBGXS7E282h2rIZj+KvCLV8z5I6QXbKNI=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3 h1:XQyxROzUlZH+WIQwySDgnISgOivlhjIEwaQaJEJrrN0=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190213061140-3a22650c66bd h1:HuTn7WObtcDo9uEEU7rEqL0jYthdXAmZ6PP+meazmaU=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a h1:oWX7TPOiFAMXLq8o0ikBYfCJVlRHBcsciT5bXOrH628=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180830151530-49385e6e1522 h1:Ve1ORMCxvRmSXBwJK+t3Oy+V2vRW2OetUQBq4rJIkZE=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190226205152-f727befe758c h1:vamGzbGri8IKo20MQncCuljcQ5uAO6kaCeawQPVblAI=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 h1:5Beo0mZN8dRzgrMMkDp0jc8YXQKx9DiJ2k1dkvGsn5A=
@@ -63,7 +54,6 @@
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/grpc v1.19.0 h1:cfg4PD8YEdSFnm7qLV4++93WcmhH2nIUhMjhdCvl3j8=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.27.0 h1:rRYRFMVgRv6E0D70Skyfsr28tDXIuuPZyWGMPdMcnXg=
@@ -73,9 +63,9 @@
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0 h1:cJv5/xdbk1NnMPR1VP9+HU6gupuG9MLBoH1r6RHZ2MY=
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099 h1:XJP7lxbSxWLOMNdBE4B/STaqVy6L73o0knwj2vIlxnw=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc h1:TnonUr8u3himcMY0vSh23jFOXA+cnucl1gB6EQTReBI=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc h1:/hemPrYIhOhy8zYrNj+069zDB68us2sMGsfkFJO0iZs=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/protobuf/api/api.go b/protobuf/api/api.go
new file mode 100644
index 0000000..67697b2
--- /dev/null
+++ b/protobuf/api/api.go
@@ -0,0 +1,25 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package api aliases all exported identifiers in
+// package "google.golang.org/protobuf/types/known/apipb".
+package api
+
+import "google.golang.org/protobuf/types/known/apipb"
+
+type Api = apipb.Api
+type Method = apipb.Method
+type Mixin = apipb.Mixin
+
+var File_google_protobuf_api_proto = apipb.File_google_protobuf_api_proto
diff --git a/protobuf/api/api.pb.go b/protobuf/api/api.pb.go
deleted file mode 100644
index 012798b..0000000
--- a/protobuf/api/api.pb.go
+++ /dev/null
@@ -1,593 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.22.0
-// 	protoc        v3.11.2
-// source: google/protobuf/api.proto
-
-package api
-
-import (
-	reflect "reflect"
-	sync "sync"
-
-	proto "github.com/golang/protobuf/proto"
-	ptype "google.golang.org/genproto/protobuf/ptype"
-	source_context "google.golang.org/genproto/protobuf/source_context"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
-// Api is a light-weight descriptor for an API Interface.
-//
-// Interfaces are also described as "protocol buffer services" in some contexts,
-// such as by the "service" keyword in a .proto file, but they are different
-// from API Services, which represent a concrete implementation of an interface
-// as opposed to simply a description of methods and bindings. They are also
-// sometimes simply referred to as "APIs" in other contexts, such as the name of
-// this message itself. See https://cloud.google.com/apis/design/glossary for
-// detailed terminology.
-type Api struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The fully qualified name of this interface, including package name
-	// followed by the interface's simple name.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// The methods of this interface, in unspecified order.
-	Methods []*Method `protobuf:"bytes,2,rep,name=methods,proto3" json:"methods,omitempty"`
-	// Any metadata attached to the interface.
-	Options []*ptype.Option `protobuf:"bytes,3,rep,name=options,proto3" json:"options,omitempty"`
-	// A version string for this interface. If specified, must have the form
-	// `major-version.minor-version`, as in `1.10`. If the minor version is
-	// omitted, it defaults to zero. If the entire version field is empty, the
-	// major version is derived from the package name, as outlined below. If the
-	// field is not empty, the version in the package name will be verified to be
-	// consistent with what is provided here.
-	//
-	// The versioning schema uses [semantic
-	// versioning](http://semver.org) where the major version number
-	// indicates a breaking change and the minor version an additive,
-	// non-breaking change. Both version numbers are signals to users
-	// what to expect from different versions, and should be carefully
-	// chosen based on the product plan.
-	//
-	// The major version is also reflected in the package name of the
-	// interface, which must end in `v<major-version>`, as in
-	// `google.feature.v1`. For major versions 0 and 1, the suffix can
-	// be omitted. Zero major versions must only be used for
-	// experimental, non-GA interfaces.
-	//
-	//
-	Version string `protobuf:"bytes,4,opt,name=version,proto3" json:"version,omitempty"`
-	// Source context for the protocol buffer service represented by this
-	// message.
-	SourceContext *source_context.SourceContext `protobuf:"bytes,5,opt,name=source_context,json=sourceContext,proto3" json:"source_context,omitempty"`
-	// Included interfaces. See [Mixin][].
-	Mixins []*Mixin `protobuf:"bytes,6,rep,name=mixins,proto3" json:"mixins,omitempty"`
-	// The source syntax of the service.
-	Syntax ptype.Syntax `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-}
-
-func (x *Api) Reset() {
-	*x = Api{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_api_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Api) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Api) ProtoMessage() {}
-
-func (x *Api) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_api_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Api.ProtoReflect.Descriptor instead.
-func (*Api) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_api_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Api) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Api) GetMethods() []*Method {
-	if x != nil {
-		return x.Methods
-	}
-	return nil
-}
-
-func (x *Api) GetOptions() []*ptype.Option {
-	if x != nil {
-		return x.Options
-	}
-	return nil
-}
-
-func (x *Api) GetVersion() string {
-	if x != nil {
-		return x.Version
-	}
-	return ""
-}
-
-func (x *Api) GetSourceContext() *source_context.SourceContext {
-	if x != nil {
-		return x.SourceContext
-	}
-	return nil
-}
-
-func (x *Api) GetMixins() []*Mixin {
-	if x != nil {
-		return x.Mixins
-	}
-	return nil
-}
-
-func (x *Api) GetSyntax() ptype.Syntax {
-	if x != nil {
-		return x.Syntax
-	}
-	return ptype.Syntax_SYNTAX_PROTO2
-}
-
-// Method represents a method of an API interface.
-type Method struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The simple name of this method.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// A URL of the input message type.
-	RequestTypeUrl string `protobuf:"bytes,2,opt,name=request_type_url,json=requestTypeUrl,proto3" json:"request_type_url,omitempty"`
-	// If true, the request is streamed.
-	RequestStreaming bool `protobuf:"varint,3,opt,name=request_streaming,json=requestStreaming,proto3" json:"request_streaming,omitempty"`
-	// The URL of the output message type.
-	ResponseTypeUrl string `protobuf:"bytes,4,opt,name=response_type_url,json=responseTypeUrl,proto3" json:"response_type_url,omitempty"`
-	// If true, the response is streamed.
-	ResponseStreaming bool `protobuf:"varint,5,opt,name=response_streaming,json=responseStreaming,proto3" json:"response_streaming,omitempty"`
-	// Any metadata attached to the method.
-	Options []*ptype.Option `protobuf:"bytes,6,rep,name=options,proto3" json:"options,omitempty"`
-	// The source syntax of this method.
-	Syntax ptype.Syntax `protobuf:"varint,7,opt,name=syntax,proto3,enum=google.protobuf.Syntax" json:"syntax,omitempty"`
-}
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-		mi := &file_google_protobuf_api_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Method) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
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-func (*Method) ProtoMessage() {}
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-func (x *Method) ProtoReflect() protoreflect.Message {
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-		if ms.LoadMessageInfo() == nil {
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-		return ms
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-	return mi.MessageOf(x)
-}
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-// Deprecated: Use Method.ProtoReflect.Descriptor instead.
-func (*Method) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_api_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *Method) GetName() string {
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-	}
-	return ""
-}
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-func (x *Method) GetRequestTypeUrl() string {
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-func (x *Method) GetRequestStreaming() bool {
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-func (x *Method) GetResponseTypeUrl() string {
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-func (x *Method) GetResponseStreaming() bool {
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-func (x *Method) GetOptions() []*ptype.Option {
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-func (x *Method) GetSyntax() ptype.Syntax {
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-// Declares an API Interface to be included in this interface. The including
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-// - If after comment and whitespace stripping, the documentation
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-//
-// - Each annotation belonging to the service config (http,
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-// - If an http annotation is inherited, the path pattern will be
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-//   specified.
-//
-// Example of a simple mixin:
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-//       // Get the underlying ACL object.
-//       rpc GetAcl(GetAclRequest) returns (Acl) {
-//         option (google.api.http).get = "/v1/{resource=**}:getAcl";
-//       }
-//     }
-//
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-//     service Storage {
-//       rpc GetAcl(GetAclRequest) returns (Acl);
-//
-//       // Get a data record.
-//       rpc GetData(GetDataRequest) returns (Data) {
-//         option (google.api.http).get = "/v2/{resource=**}";
-//       }
-//     }
-//
-// Example of a mixin configuration:
-//
-//     apis:
-//     - name: google.storage.v2.Storage
-//       mixins:
-//       - name: google.acl.v1.AccessControl
-//
-// The mixin construct implies that all methods in `AccessControl` are
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-// documentation and annotations as follows:
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-//     service Storage {
-//       // Get the underlying ACL object.
-//       rpc GetAcl(GetAclRequest) returns (Acl) {
-//         option (google.api.http).get = "/v2/{resource=**}:getAcl";
-//       }
-//       ...
-//     }
-//
-// Note how the version in the path pattern changed from `v1` to `v2`.
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-//     apis:
-//     - name: google.storage.v2.Storage
-//       mixins:
-//       - name: google.acl.v1.AccessControl
-//         root: acls
-//
-// This implies the following inherited HTTP annotation:
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-//     service Storage {
-//       // Get the underlying ACL object.
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-//       ...
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-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
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-// Deprecated: Use Mixin.ProtoReflect.Descriptor instead.
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-}
-
-func (x *Mixin) GetName() string {
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-	}
-	return ""
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-func (x *Mixin) GetRoot() string {
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-
-var (
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-)
-
-func file_google_protobuf_api_proto_rawDescGZIP() []byte {
-	file_google_protobuf_api_proto_rawDescOnce.Do(func() {
-		file_google_protobuf_api_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_api_proto_rawDescData)
-	})
-	return file_google_protobuf_api_proto_rawDescData
-}
-
-var file_google_protobuf_api_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
-var file_google_protobuf_api_proto_goTypes = []interface{}{
-	(*Api)(nil),                          // 0: google.protobuf.Api
-	(*Method)(nil),                       // 1: google.protobuf.Method
-	(*Mixin)(nil),                        // 2: google.protobuf.Mixin
-	(*ptype.Option)(nil),                 // 3: google.protobuf.Option
-	(*source_context.SourceContext)(nil), // 4: google.protobuf.SourceContext
-	(ptype.Syntax)(0),                    // 5: google.protobuf.Syntax
-}
-var file_google_protobuf_api_proto_depIdxs = []int32{
-	1, // 0: google.protobuf.Api.methods:type_name -> google.protobuf.Method
-	3, // 1: google.protobuf.Api.options:type_name -> google.protobuf.Option
-	4, // 2: google.protobuf.Api.source_context:type_name -> google.protobuf.SourceContext
-	2, // 3: google.protobuf.Api.mixins:type_name -> google.protobuf.Mixin
-	5, // 4: google.protobuf.Api.syntax:type_name -> google.protobuf.Syntax
-	3, // 5: google.protobuf.Method.options:type_name -> google.protobuf.Option
-	5, // 6: google.protobuf.Method.syntax:type_name -> google.protobuf.Syntax
-	7, // [7:7] is the sub-list for method output_type
-	7, // [7:7] is the sub-list for method input_type
-	7, // [7:7] is the sub-list for extension type_name
-	7, // [7:7] is the sub-list for extension extendee
-	0, // [0:7] is the sub-list for field type_name
-}
-
-func init() { file_google_protobuf_api_proto_init() }
-func file_google_protobuf_api_proto_init() {
-	if File_google_protobuf_api_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_google_protobuf_api_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Api); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_api_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Method); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_api_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Mixin); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_google_protobuf_api_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   3,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_google_protobuf_api_proto_goTypes,
-		DependencyIndexes: file_google_protobuf_api_proto_depIdxs,
-		MessageInfos:      file_google_protobuf_api_proto_msgTypes,
-	}.Build()
-	File_google_protobuf_api_proto = out.File
-	file_google_protobuf_api_proto_rawDesc = nil
-	file_google_protobuf_api_proto_goTypes = nil
-	file_google_protobuf_api_proto_depIdxs = nil
-}
diff --git a/protobuf/field_mask/field_mask.go b/protobuf/field_mask/field_mask.go
new file mode 100644
index 0000000..d10ad66
--- /dev/null
+++ b/protobuf/field_mask/field_mask.go
@@ -0,0 +1,23 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package field_mask aliases all exported identifiers in
+// package "google.golang.org/protobuf/types/known/fieldmaskpb".
+package field_mask
+
+import "google.golang.org/protobuf/types/known/fieldmaskpb"
+
+type FieldMask = fieldmaskpb.FieldMask
+
+var File_google_protobuf_field_mask_proto = fieldmaskpb.File_google_protobuf_field_mask_proto
diff --git a/protobuf/field_mask/field_mask.pb.go b/protobuf/field_mask/field_mask.pb.go
deleted file mode 100644
index 6eb59d9..0000000
--- a/protobuf/field_mask/field_mask.pb.go
+++ /dev/null
@@ -1,387 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.22.0
-// 	protoc        v3.11.2
-// source: google/protobuf/field_mask.proto
-
-package field_mask
-
-import (
-	reflect "reflect"
-	sync "sync"
-
-	proto "github.com/golang/protobuf/proto"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
-// `FieldMask` represents a set of symbolic field paths, for example:
-//
-//     paths: "f.a"
-//     paths: "f.b.d"
-//
-// Here `f` represents a field in some root message, `a` and `b`
-// fields in the message found in `f`, and `d` a field found in the
-// message in `f.b`.
-//
-// Field masks are used to specify a subset of fields that should be
-// returned by a get operation or modified by an update operation.
-// Field masks also have a custom JSON encoding (see below).
-//
-// # Field Masks in Projections
-//
-// When used in the context of a projection, a response message or
-// sub-message is filtered by the API to only contain those fields as
-// specified in the mask. For example, if the mask in the previous
-// example is applied to a response message as follows:
-//
-//     f {
-//       a : 22
-//       b {
-//         d : 1
-//         x : 2
-//       }
-//       y : 13
-//     }
-//     z: 8
-//
-// The result will not contain specific values for fields x,y and z
-// (their value will be set to the default, and omitted in proto text
-// output):
-//
-//
-//     f {
-//       a : 22
-//       b {
-//         d : 1
-//       }
-//     }
-//
-// A repeated field is not allowed except at the last position of a
-// paths string.
-//
-// If a FieldMask object is not present in a get operation, the
-// operation applies to all fields (as if a FieldMask of all fields
-// had been specified).
-//
-// Note that a field mask does not necessarily apply to the
-// top-level response message. In case of a REST get operation, the
-// field mask applies directly to the response, but in case of a REST
-// list operation, the mask instead applies to each individual message
-// in the returned resource list. In case of a REST custom method,
-// other definitions may be used. Where the mask applies will be
-// clearly documented together with its declaration in the API.  In
-// any case, the effect on the returned resource/resources is required
-// behavior for APIs.
-//
-// # Field Masks in Update Operations
-//
-// A field mask in update operations specifies which fields of the
-// targeted resource are going to be updated. The API is required
-// to only change the values of the fields as specified in the mask
-// and leave the others untouched. If a resource is passed in to
-// describe the updated values, the API ignores the values of all
-// fields not covered by the mask.
-//
-// If a repeated field is specified for an update operation, new values will
-// be appended to the existing repeated field in the target resource. Note that
-// a repeated field is only allowed in the last position of a `paths` string.
-//
-// If a sub-message is specified in the last position of the field mask for an
-// update operation, then new value will be merged into the existing sub-message
-// in the target resource.
-//
-// For example, given the target message:
-//
-//     f {
-//       b {
-//         d: 1
-//         x: 2
-//       }
-//       c: [1]
-//     }
-//
-// And an update message:
-//
-//     f {
-//       b {
-//         d: 10
-//       }
-//       c: [2]
-//     }
-//
-// then if the field mask is:
-//
-//  paths: ["f.b", "f.c"]
-//
-// then the result will be:
-//
-//     f {
-//       b {
-//         d: 10
-//         x: 2
-//       }
-//       c: [1, 2]
-//     }
-//
-// An implementation may provide options to override this default behavior for
-// repeated and message fields.
-//
-// In order to reset a field's value to the default, the field must
-// be in the mask and set to the default value in the provided resource.
-// Hence, in order to reset all fields of a resource, provide a default
-// instance of the resource and set all fields in the mask, or do
-// not provide a mask as described below.
-//
-// If a field mask is not present on update, the operation applies to
-// all fields (as if a field mask of all fields has been specified).
-// Note that in the presence of schema evolution, this may mean that
-// fields the client does not know and has therefore not filled into
-// the request will be reset to their default. If this is unwanted
-// behavior, a specific service may require a client to always specify
-// a field mask, producing an error if not.
-//
-// As with get operations, the location of the resource which
-// describes the updated values in the request message depends on the
-// operation kind. In any case, the effect of the field mask is
-// required to be honored by the API.
-//
-// ## Considerations for HTTP REST
-//
-// The HTTP kind of an update operation which uses a field mask must
-// be set to PATCH instead of PUT in order to satisfy HTTP semantics
-// (PUT must only be used for full updates).
-//
-// # JSON Encoding of Field Masks
-//
-// In JSON, a field mask is encoded as a single string where paths are
-// separated by a comma. Fields name in each path are converted
-// to/from lower-camel naming conventions.
-//
-// As an example, consider the following message declarations:
-//
-//     message Profile {
-//       User user = 1;
-//       Photo photo = 2;
-//     }
-//     message User {
-//       string display_name = 1;
-//       string address = 2;
-//     }
-//
-// In proto a field mask for `Profile` may look as such:
-//
-//     mask {
-//       paths: "user.display_name"
-//       paths: "photo"
-//     }
-//
-// In JSON, the same mask is represented as below:
-//
-//     {
-//       mask: "user.displayName,photo"
-//     }
-//
-// # Field Masks and Oneof Fields
-//
-// Field masks treat fields in oneofs just as regular fields. Consider the
-// following message:
-//
-//     message SampleMessage {
-//       oneof test_oneof {
-//         string name = 4;
-//         SubMessage sub_message = 9;
-//       }
-//     }
-//
-// The field mask can be:
-//
-//     mask {
-//       paths: "name"
-//     }
-//
-// Or:
-//
-//     mask {
-//       paths: "sub_message"
-//     }
-//
-// Note that oneof type names ("test_oneof" in this case) cannot be used in
-// paths.
-//
-// ## Field Mask Verification
-//
-// The implementation of any API method which has a FieldMask type field in the
-// request should verify the included field paths, and return an
-// `INVALID_ARGUMENT` error if any path is unmappable.
-type FieldMask struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The set of field mask paths.
-	Paths []string `protobuf:"bytes,1,rep,name=paths,proto3" json:"paths,omitempty"`
-}
-
-func (x *FieldMask) Reset() {
-	*x = FieldMask{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_field_mask_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *FieldMask) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*FieldMask) ProtoMessage() {}
-
-func (x *FieldMask) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_field_mask_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use FieldMask.ProtoReflect.Descriptor instead.
-func (*FieldMask) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_field_mask_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *FieldMask) GetPaths() []string {
-	if x != nil {
-		return x.Paths
-	}
-	return nil
-}
-
-var File_google_protobuf_field_mask_proto protoreflect.FileDescriptor
-
-var file_google_protobuf_field_mask_proto_rawDesc = []byte{
-	0x0a, 0x20, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
-	0x66, 0x2f, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x5f, 0x6d, 0x61, 0x73, 0x6b, 0x2e, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x12, 0x0f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x62, 0x75, 0x66, 0x22, 0x21, 0x0a, 0x09, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x4d, 0x61, 0x73, 0x6b,
-	0x12, 0x14, 0x0a, 0x05, 0x70, 0x61, 0x74, 0x68, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x09, 0x52,
-	0x05, 0x70, 0x61, 0x74, 0x68, 0x73, 0x42, 0x8c, 0x01, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x67,
-	0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x42, 0x0e,
-	0x46, 0x69, 0x65, 0x6c, 0x64, 0x4d, 0x61, 0x73, 0x6b, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01,
-	0x5a, 0x39, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2e,
-	0x6f, 0x72, 0x67, 0x2f, 0x67, 0x65, 0x6e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x70, 0x72, 0x6f,
-	0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x5f, 0x6d, 0x61, 0x73, 0x6b,
-	0x3b, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x5f, 0x6d, 0x61, 0x73, 0x6b, 0xf8, 0x01, 0x01, 0xa2, 0x02,
-	0x03, 0x47, 0x50, 0x42, 0xaa, 0x02, 0x1e, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x50, 0x72,
-	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x57, 0x65, 0x6c, 0x6c, 0x4b, 0x6e, 0x6f, 0x77, 0x6e,
-	0x54, 0x79, 0x70, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_google_protobuf_field_mask_proto_rawDescOnce sync.Once
-	file_google_protobuf_field_mask_proto_rawDescData = file_google_protobuf_field_mask_proto_rawDesc
-)
-
-func file_google_protobuf_field_mask_proto_rawDescGZIP() []byte {
-	file_google_protobuf_field_mask_proto_rawDescOnce.Do(func() {
-		file_google_protobuf_field_mask_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_field_mask_proto_rawDescData)
-	})
-	return file_google_protobuf_field_mask_proto_rawDescData
-}
-
-var file_google_protobuf_field_mask_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_google_protobuf_field_mask_proto_goTypes = []interface{}{
-	(*FieldMask)(nil), // 0: google.protobuf.FieldMask
-}
-var file_google_protobuf_field_mask_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_google_protobuf_field_mask_proto_init() }
-func file_google_protobuf_field_mask_proto_init() {
-	if File_google_protobuf_field_mask_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_google_protobuf_field_mask_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*FieldMask); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_google_protobuf_field_mask_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_google_protobuf_field_mask_proto_goTypes,
-		DependencyIndexes: file_google_protobuf_field_mask_proto_depIdxs,
-		MessageInfos:      file_google_protobuf_field_mask_proto_msgTypes,
-	}.Build()
-	File_google_protobuf_field_mask_proto = out.File
-	file_google_protobuf_field_mask_proto_rawDesc = nil
-	file_google_protobuf_field_mask_proto_goTypes = nil
-	file_google_protobuf_field_mask_proto_depIdxs = nil
-}
diff --git a/protobuf/ptype/type.go b/protobuf/ptype/type.go
new file mode 100644
index 0000000..2c49be9
--- /dev/null
+++ b/protobuf/ptype/type.go
@@ -0,0 +1,82 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package ptype aliases all exported identifiers in
+// package "google.golang.org/protobuf/types/known/typepb".
+package ptype
+
+import "google.golang.org/protobuf/types/known/typepb"
+
+type Syntax = typepb.Syntax
+
+const (
+	Syntax_SYNTAX_PROTO2 = typepb.Syntax_SYNTAX_PROTO2
+	Syntax_SYNTAX_PROTO3 = typepb.Syntax_SYNTAX_PROTO3
+)
+
+var (
+	Syntax_name  = typepb.Syntax_name
+	Syntax_value = typepb.Syntax_value
+)
+
+type Field_Kind = typepb.Field_Kind
+
+const (
+	Field_TYPE_UNKNOWN  = typepb.Field_TYPE_UNKNOWN
+	Field_TYPE_DOUBLE   = typepb.Field_TYPE_DOUBLE
+	Field_TYPE_FLOAT    = typepb.Field_TYPE_FLOAT
+	Field_TYPE_INT64    = typepb.Field_TYPE_INT64
+	Field_TYPE_UINT64   = typepb.Field_TYPE_UINT64
+	Field_TYPE_INT32    = typepb.Field_TYPE_INT32
+	Field_TYPE_FIXED64  = typepb.Field_TYPE_FIXED64
+	Field_TYPE_FIXED32  = typepb.Field_TYPE_FIXED32
+	Field_TYPE_BOOL     = typepb.Field_TYPE_BOOL
+	Field_TYPE_STRING   = typepb.Field_TYPE_STRING
+	Field_TYPE_GROUP    = typepb.Field_TYPE_GROUP
+	Field_TYPE_MESSAGE  = typepb.Field_TYPE_MESSAGE
+	Field_TYPE_BYTES    = typepb.Field_TYPE_BYTES
+	Field_TYPE_UINT32   = typepb.Field_TYPE_UINT32
+	Field_TYPE_ENUM     = typepb.Field_TYPE_ENUM
+	Field_TYPE_SFIXED32 = typepb.Field_TYPE_SFIXED32
+	Field_TYPE_SFIXED64 = typepb.Field_TYPE_SFIXED64
+	Field_TYPE_SINT32   = typepb.Field_TYPE_SINT32
+	Field_TYPE_SINT64   = typepb.Field_TYPE_SINT64
+)
+
+var (
+	Field_Kind_name  = typepb.Field_Kind_name
+	Field_Kind_value = typepb.Field_Kind_value
+)
+
+type Field_Cardinality = typepb.Field_Cardinality
+
+const (
+	Field_CARDINALITY_UNKNOWN  = typepb.Field_CARDINALITY_UNKNOWN
+	Field_CARDINALITY_OPTIONAL = typepb.Field_CARDINALITY_OPTIONAL
+	Field_CARDINALITY_REQUIRED = typepb.Field_CARDINALITY_REQUIRED
+	Field_CARDINALITY_REPEATED = typepb.Field_CARDINALITY_REPEATED
+)
+
+var (
+	Field_Cardinality_name  = typepb.Field_Cardinality_name
+	Field_Cardinality_value = typepb.Field_Cardinality_value
+)
+
+type Type = typepb.Type
+type Field = typepb.Field
+type Enum = typepb.Enum
+type EnumValue = typepb.EnumValue
+type Option = typepb.Option
+
+var File_google_protobuf_type_proto = typepb.File_google_protobuf_type_proto
diff --git a/protobuf/ptype/type.pb.go b/protobuf/ptype/type.pb.go
deleted file mode 100644
index fcec3bf..0000000
--- a/protobuf/ptype/type.pb.go
+++ /dev/null
@@ -1,980 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.22.0
-// 	protoc        v3.11.2
-// source: google/protobuf/type.proto
-
-package ptype
-
-import (
-	reflect "reflect"
-	sync "sync"
-
-	proto "github.com/golang/protobuf/proto"
-	any "github.com/golang/protobuf/ptypes/any"
-	source_context "google.golang.org/genproto/protobuf/source_context"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
-// The syntax in which a protocol buffer element is defined.
-type Syntax int32
-
-const (
-	// Syntax `proto2`.
-	Syntax_SYNTAX_PROTO2 Syntax = 0
-	// Syntax `proto3`.
-	Syntax_SYNTAX_PROTO3 Syntax = 1
-)
-
-// Enum value maps for Syntax.
-var (
-	Syntax_name = map[int32]string{
-		0: "SYNTAX_PROTO2",
-		1: "SYNTAX_PROTO3",
-	}
-	Syntax_value = map[string]int32{
-		"SYNTAX_PROTO2": 0,
-		"SYNTAX_PROTO3": 1,
-	}
-)
-
-func (x Syntax) Enum() *Syntax {
-	p := new(Syntax)
-	*p = x
-	return p
-}
-
-func (x Syntax) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Syntax) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_protobuf_type_proto_enumTypes[0].Descriptor()
-}
-
-func (Syntax) Type() protoreflect.EnumType {
-	return &file_google_protobuf_type_proto_enumTypes[0]
-}
-
-func (x Syntax) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use Syntax.Descriptor instead.
-func (Syntax) EnumDescriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{0}
-}
-
-// Basic field types.
-type Field_Kind int32
-
-const (
-	// Field type unknown.
-	Field_TYPE_UNKNOWN Field_Kind = 0
-	// Field type double.
-	Field_TYPE_DOUBLE Field_Kind = 1
-	// Field type float.
-	Field_TYPE_FLOAT Field_Kind = 2
-	// Field type int64.
-	Field_TYPE_INT64 Field_Kind = 3
-	// Field type uint64.
-	Field_TYPE_UINT64 Field_Kind = 4
-	// Field type int32.
-	Field_TYPE_INT32 Field_Kind = 5
-	// Field type fixed64.
-	Field_TYPE_FIXED64 Field_Kind = 6
-	// Field type fixed32.
-	Field_TYPE_FIXED32 Field_Kind = 7
-	// Field type bool.
-	Field_TYPE_BOOL Field_Kind = 8
-	// Field type string.
-	Field_TYPE_STRING Field_Kind = 9
-	// Field type group. Proto2 syntax only, and deprecated.
-	Field_TYPE_GROUP Field_Kind = 10
-	// Field type message.
-	Field_TYPE_MESSAGE Field_Kind = 11
-	// Field type bytes.
-	Field_TYPE_BYTES Field_Kind = 12
-	// Field type uint32.
-	Field_TYPE_UINT32 Field_Kind = 13
-	// Field type enum.
-	Field_TYPE_ENUM Field_Kind = 14
-	// Field type sfixed32.
-	Field_TYPE_SFIXED32 Field_Kind = 15
-	// Field type sfixed64.
-	Field_TYPE_SFIXED64 Field_Kind = 16
-	// Field type sint32.
-	Field_TYPE_SINT32 Field_Kind = 17
-	// Field type sint64.
-	Field_TYPE_SINT64 Field_Kind = 18
-)
-
-// Enum value maps for Field_Kind.
-var (
-	Field_Kind_name = map[int32]string{
-		0:  "TYPE_UNKNOWN",
-		1:  "TYPE_DOUBLE",
-		2:  "TYPE_FLOAT",
-		3:  "TYPE_INT64",
-		4:  "TYPE_UINT64",
-		5:  "TYPE_INT32",
-		6:  "TYPE_FIXED64",
-		7:  "TYPE_FIXED32",
-		8:  "TYPE_BOOL",
-		9:  "TYPE_STRING",
-		10: "TYPE_GROUP",
-		11: "TYPE_MESSAGE",
-		12: "TYPE_BYTES",
-		13: "TYPE_UINT32",
-		14: "TYPE_ENUM",
-		15: "TYPE_SFIXED32",
-		16: "TYPE_SFIXED64",
-		17: "TYPE_SINT32",
-		18: "TYPE_SINT64",
-	}
-	Field_Kind_value = map[string]int32{
-		"TYPE_UNKNOWN":  0,
-		"TYPE_DOUBLE":   1,
-		"TYPE_FLOAT":    2,
-		"TYPE_INT64":    3,
-		"TYPE_UINT64":   4,
-		"TYPE_INT32":    5,
-		"TYPE_FIXED64":  6,
-		"TYPE_FIXED32":  7,
-		"TYPE_BOOL":     8,
-		"TYPE_STRING":   9,
-		"TYPE_GROUP":    10,
-		"TYPE_MESSAGE":  11,
-		"TYPE_BYTES":    12,
-		"TYPE_UINT32":   13,
-		"TYPE_ENUM":     14,
-		"TYPE_SFIXED32": 15,
-		"TYPE_SFIXED64": 16,
-		"TYPE_SINT32":   17,
-		"TYPE_SINT64":   18,
-	}
-)
-
-func (x Field_Kind) Enum() *Field_Kind {
-	p := new(Field_Kind)
-	*p = x
-	return p
-}
-
-func (x Field_Kind) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Field_Kind) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_protobuf_type_proto_enumTypes[1].Descriptor()
-}
-
-func (Field_Kind) Type() protoreflect.EnumType {
-	return &file_google_protobuf_type_proto_enumTypes[1]
-}
-
-func (x Field_Kind) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use Field_Kind.Descriptor instead.
-func (Field_Kind) EnumDescriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{1, 0}
-}
-
-// Whether a field is optional, required, or repeated.
-type Field_Cardinality int32
-
-const (
-	// For fields with unknown cardinality.
-	Field_CARDINALITY_UNKNOWN Field_Cardinality = 0
-	// For optional fields.
-	Field_CARDINALITY_OPTIONAL Field_Cardinality = 1
-	// For required fields. Proto2 syntax only.
-	Field_CARDINALITY_REQUIRED Field_Cardinality = 2
-	// For repeated fields.
-	Field_CARDINALITY_REPEATED Field_Cardinality = 3
-)
-
-// Enum value maps for Field_Cardinality.
-var (
-	Field_Cardinality_name = map[int32]string{
-		0: "CARDINALITY_UNKNOWN",
-		1: "CARDINALITY_OPTIONAL",
-		2: "CARDINALITY_REQUIRED",
-		3: "CARDINALITY_REPEATED",
-	}
-	Field_Cardinality_value = map[string]int32{
-		"CARDINALITY_UNKNOWN":  0,
-		"CARDINALITY_OPTIONAL": 1,
-		"CARDINALITY_REQUIRED": 2,
-		"CARDINALITY_REPEATED": 3,
-	}
-)
-
-func (x Field_Cardinality) Enum() *Field_Cardinality {
-	p := new(Field_Cardinality)
-	*p = x
-	return p
-}
-
-func (x Field_Cardinality) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (Field_Cardinality) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_protobuf_type_proto_enumTypes[2].Descriptor()
-}
-
-func (Field_Cardinality) Type() protoreflect.EnumType {
-	return &file_google_protobuf_type_proto_enumTypes[2]
-}
-
-func (x Field_Cardinality) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use Field_Cardinality.Descriptor instead.
-func (Field_Cardinality) EnumDescriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{1, 1}
-}
-
-// A protocol buffer message type.
-type Type struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The fully qualified message name.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// The list of fields.
-	Fields []*Field `protobuf:"bytes,2,rep,name=fields,proto3" json:"fields,omitempty"`
-	// The list of types appearing in `oneof` definitions in this type.
-	Oneofs []string `protobuf:"bytes,3,rep,name=oneofs,proto3" json:"oneofs,omitempty"`
-	// The protocol buffer options.
-	Options []*Option `protobuf:"bytes,4,rep,name=options,proto3" json:"options,omitempty"`
-	// The source context.
-	SourceContext *source_context.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"`
-}
-
-func (x *Type) Reset() {
-	*x = Type{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_type_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Type) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Type) ProtoMessage() {}
-
-func (x *Type) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_type_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Type.ProtoReflect.Descriptor instead.
-func (*Type) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Type) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Type) GetFields() []*Field {
-	if x != nil {
-		return x.Fields
-	}
-	return nil
-}
-
-func (x *Type) GetOneofs() []string {
-	if x != nil {
-		return x.Oneofs
-	}
-	return nil
-}
-
-func (x *Type) GetOptions() []*Option {
-	if x != nil {
-		return x.Options
-	}
-	return nil
-}
-
-func (x *Type) GetSourceContext() *source_context.SourceContext {
-	if x != nil {
-		return x.SourceContext
-	}
-	return nil
-}
-
-func (x *Type) GetSyntax() Syntax {
-	if x != nil {
-		return x.Syntax
-	}
-	return Syntax_SYNTAX_PROTO2
-}
-
-// A single field of a message type.
-type Field struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The field type.
-	Kind Field_Kind `protobuf:"varint,1,opt,name=kind,proto3,enum=google.protobuf.Field_Kind" json:"kind,omitempty"`
-	// The field cardinality.
-	Cardinality Field_Cardinality `protobuf:"varint,2,opt,name=cardinality,proto3,enum=google.protobuf.Field_Cardinality" json:"cardinality,omitempty"`
-	// The field number.
-	Number int32 `protobuf:"varint,3,opt,name=number,proto3" json:"number,omitempty"`
-	// The field name.
-	Name string `protobuf:"bytes,4,opt,name=name,proto3" json:"name,omitempty"`
-	// The field type URL, without the scheme, for message or enumeration
-	// types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
-	TypeUrl string `protobuf:"bytes,6,opt,name=type_url,json=typeUrl,proto3" json:"type_url,omitempty"`
-	// The index of the field type in `Type.oneofs`, for message or enumeration
-	// types. The first type has index 1; zero means the type is not in the list.
-	OneofIndex int32 `protobuf:"varint,7,opt,name=oneof_index,json=oneofIndex,proto3" json:"oneof_index,omitempty"`
-	// Whether to use alternative packed wire representation.
-	Packed bool `protobuf:"varint,8,opt,name=packed,proto3" json:"packed,omitempty"`
-	// The protocol buffer options.
-	Options []*Option `protobuf:"bytes,9,rep,name=options,proto3" json:"options,omitempty"`
-	// 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"`
-}
-
-func (x *Field) Reset() {
-	*x = Field{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_type_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Field) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Field) ProtoMessage() {}
-
-func (x *Field) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_type_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Field.ProtoReflect.Descriptor instead.
-func (*Field) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *Field) GetKind() Field_Kind {
-	if x != nil {
-		return x.Kind
-	}
-	return Field_TYPE_UNKNOWN
-}
-
-func (x *Field) GetCardinality() Field_Cardinality {
-	if x != nil {
-		return x.Cardinality
-	}
-	return Field_CARDINALITY_UNKNOWN
-}
-
-func (x *Field) GetNumber() int32 {
-	if x != nil {
-		return x.Number
-	}
-	return 0
-}
-
-func (x *Field) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Field) GetTypeUrl() string {
-	if x != nil {
-		return x.TypeUrl
-	}
-	return ""
-}
-
-func (x *Field) GetOneofIndex() int32 {
-	if x != nil {
-		return x.OneofIndex
-	}
-	return 0
-}
-
-func (x *Field) GetPacked() bool {
-	if x != nil {
-		return x.Packed
-	}
-	return false
-}
-
-func (x *Field) GetOptions() []*Option {
-	if x != nil {
-		return x.Options
-	}
-	return nil
-}
-
-func (x *Field) GetJsonName() string {
-	if x != nil {
-		return x.JsonName
-	}
-	return ""
-}
-
-func (x *Field) GetDefaultValue() string {
-	if x != nil {
-		return x.DefaultValue
-	}
-	return ""
-}
-
-// Enum type definition.
-type Enum struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Enum type name.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// Enum value definitions.
-	Enumvalue []*EnumValue `protobuf:"bytes,2,rep,name=enumvalue,proto3" json:"enumvalue,omitempty"`
-	// Protocol buffer options.
-	Options []*Option `protobuf:"bytes,3,rep,name=options,proto3" json:"options,omitempty"`
-	// The source context.
-	SourceContext *source_context.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"`
-}
-
-func (x *Enum) Reset() {
-	*x = Enum{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_type_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Enum) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Enum) ProtoMessage() {}
-
-func (x *Enum) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_type_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Enum.ProtoReflect.Descriptor instead.
-func (*Enum) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{2}
-}
-
-func (x *Enum) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Enum) GetEnumvalue() []*EnumValue {
-	if x != nil {
-		return x.Enumvalue
-	}
-	return nil
-}
-
-func (x *Enum) GetOptions() []*Option {
-	if x != nil {
-		return x.Options
-	}
-	return nil
-}
-
-func (x *Enum) GetSourceContext() *source_context.SourceContext {
-	if x != nil {
-		return x.SourceContext
-	}
-	return nil
-}
-
-func (x *Enum) GetSyntax() Syntax {
-	if x != nil {
-		return x.Syntax
-	}
-	return Syntax_SYNTAX_PROTO2
-}
-
-// Enum value definition.
-type EnumValue struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// Enum value name.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// 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"`
-}
-
-func (x *EnumValue) Reset() {
-	*x = EnumValue{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_type_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *EnumValue) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*EnumValue) ProtoMessage() {}
-
-func (x *EnumValue) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_type_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use EnumValue.ProtoReflect.Descriptor instead.
-func (*EnumValue) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{3}
-}
-
-func (x *EnumValue) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *EnumValue) GetNumber() int32 {
-	if x != nil {
-		return x.Number
-	}
-	return 0
-}
-
-func (x *EnumValue) GetOptions() []*Option {
-	if x != nil {
-		return x.Options
-	}
-	return nil
-}
-
-// A protocol buffer option, which can be attached to a message, field,
-// enumeration, etc.
-type Option struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// The option's name. For protobuf built-in options (options defined in
-	// descriptor.proto), this is the short name. For example, `"map_entry"`.
-	// For custom options, it should be the fully-qualified name. For example,
-	// `"google.api.http"`.
-	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// The option's value packed in an Any message. If the value is a primitive,
-	// 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.Any `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
-}
-
-func (x *Option) Reset() {
-	*x = Option{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_type_proto_msgTypes[4]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Option) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Option) ProtoMessage() {}
-
-func (x *Option) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_type_proto_msgTypes[4]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Option.ProtoReflect.Descriptor instead.
-func (*Option) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_type_proto_rawDescGZIP(), []int{4}
-}
-
-func (x *Option) GetName() string {
-	if x != nil {
-		return x.Name
-	}
-	return ""
-}
-
-func (x *Option) GetValue() *any.Any {
-	if x != nil {
-		return x.Value
-	}
-	return nil
-}
-
-var File_google_protobuf_type_proto protoreflect.FileDescriptor
-
-var file_google_protobuf_type_proto_rawDesc = []byte{
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-var (
-	file_google_protobuf_type_proto_rawDescOnce sync.Once
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-)
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-	})
-	return file_google_protobuf_type_proto_rawDescData
-}
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-var file_google_protobuf_type_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
-var file_google_protobuf_type_proto_goTypes = []interface{}{
-	(Syntax)(0),                          // 0: google.protobuf.Syntax
-	(Field_Kind)(0),                      // 1: google.protobuf.Field.Kind
-	(Field_Cardinality)(0),               // 2: google.protobuf.Field.Cardinality
-	(*Type)(nil),                         // 3: google.protobuf.Type
-	(*Field)(nil),                        // 4: google.protobuf.Field
-	(*Enum)(nil),                         // 5: google.protobuf.Enum
-	(*EnumValue)(nil),                    // 6: google.protobuf.EnumValue
-	(*Option)(nil),                       // 7: google.protobuf.Option
-	(*source_context.SourceContext)(nil), // 8: google.protobuf.SourceContext
-	(*any.Any)(nil),                      // 9: google.protobuf.Any
-}
-var file_google_protobuf_type_proto_depIdxs = []int32{
-	4,  // 0: google.protobuf.Type.fields:type_name -> google.protobuf.Field
-	7,  // 1: google.protobuf.Type.options:type_name -> google.protobuf.Option
-	8,  // 2: google.protobuf.Type.source_context:type_name -> google.protobuf.SourceContext
-	0,  // 3: google.protobuf.Type.syntax:type_name -> google.protobuf.Syntax
-	1,  // 4: google.protobuf.Field.kind:type_name -> google.protobuf.Field.Kind
-	2,  // 5: google.protobuf.Field.cardinality:type_name -> google.protobuf.Field.Cardinality
-	7,  // 6: google.protobuf.Field.options:type_name -> google.protobuf.Option
-	6,  // 7: google.protobuf.Enum.enumvalue:type_name -> google.protobuf.EnumValue
-	7,  // 8: google.protobuf.Enum.options:type_name -> google.protobuf.Option
-	8,  // 9: google.protobuf.Enum.source_context:type_name -> google.protobuf.SourceContext
-	0,  // 10: google.protobuf.Enum.syntax:type_name -> google.protobuf.Syntax
-	7,  // 11: google.protobuf.EnumValue.options:type_name -> google.protobuf.Option
-	9,  // 12: google.protobuf.Option.value:type_name -> google.protobuf.Any
-	13, // [13:13] is the sub-list for method output_type
-	13, // [13:13] is the sub-list for method input_type
-	13, // [13:13] is the sub-list for extension type_name
-	13, // [13:13] is the sub-list for extension extendee
-	0,  // [0:13] is the sub-list for field type_name
-}
-
-func init() { file_google_protobuf_type_proto_init() }
-func file_google_protobuf_type_proto_init() {
-	if File_google_protobuf_type_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_google_protobuf_type_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Type); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_type_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Field); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_type_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Enum); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_type_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*EnumValue); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_google_protobuf_type_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Option); i {
-			case 0:
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-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
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-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_google_protobuf_type_proto_rawDesc,
-			NumEnums:      3,
-			NumMessages:   5,
-			NumExtensions: 0,
-			NumServices:   0,
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-		GoTypes:           file_google_protobuf_type_proto_goTypes,
-		DependencyIndexes: file_google_protobuf_type_proto_depIdxs,
-		EnumInfos:         file_google_protobuf_type_proto_enumTypes,
-		MessageInfos:      file_google_protobuf_type_proto_msgTypes,
-	}.Build()
-	File_google_protobuf_type_proto = out.File
-	file_google_protobuf_type_proto_rawDesc = nil
-	file_google_protobuf_type_proto_goTypes = nil
-	file_google_protobuf_type_proto_depIdxs = nil
-}
diff --git a/protobuf/source_context/source_context.go b/protobuf/source_context/source_context.go
new file mode 100644
index 0000000..3f31da9
--- /dev/null
+++ b/protobuf/source_context/source_context.go
@@ -0,0 +1,23 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package source_context aliases all exported identifiers in
+// package "google.golang.org/protobuf/types/known/sourcecontextpb".
+package source_context
+
+import "google.golang.org/protobuf/types/known/sourcecontextpb"
+
+type SourceContext = sourcecontextpb.SourceContext
+
+var File_google_protobuf_source_context_proto = sourcecontextpb.File_google_protobuf_source_context_proto
diff --git a/protobuf/source_context/source_context.pb.go b/protobuf/source_context/source_context.pb.go
deleted file mode 100644
index fadc13f..0000000
--- a/protobuf/source_context/source_context.pb.go
+++ /dev/null
@@ -1,193 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.22.0
-// 	protoc        v3.11.2
-// source: google/protobuf/source_context.proto
-
-package source_context
-
-import (
-	reflect "reflect"
-	sync "sync"
-
-	proto "github.com/golang/protobuf/proto"
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
-// `SourceContext` represents information about the source of a
-// protobuf element, like the file in which it is defined.
-type SourceContext struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	// 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"`
-}
-
-func (x *SourceContext) Reset() {
-	*x = SourceContext{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_google_protobuf_source_context_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *SourceContext) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*SourceContext) ProtoMessage() {}
-
-func (x *SourceContext) ProtoReflect() protoreflect.Message {
-	mi := &file_google_protobuf_source_context_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use SourceContext.ProtoReflect.Descriptor instead.
-func (*SourceContext) Descriptor() ([]byte, []int) {
-	return file_google_protobuf_source_context_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *SourceContext) GetFileName() string {
-	if x != nil {
-		return x.FileName
-	}
-	return ""
-}
-
-var File_google_protobuf_source_context_proto protoreflect.FileDescriptor
-
-var file_google_protobuf_source_context_proto_rawDesc = []byte{
-	0x0a, 0x24, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
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-	0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_google_protobuf_source_context_proto_rawDescOnce sync.Once
-	file_google_protobuf_source_context_proto_rawDescData = file_google_protobuf_source_context_proto_rawDesc
-)
-
-func file_google_protobuf_source_context_proto_rawDescGZIP() []byte {
-	file_google_protobuf_source_context_proto_rawDescOnce.Do(func() {
-		file_google_protobuf_source_context_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_protobuf_source_context_proto_rawDescData)
-	})
-	return file_google_protobuf_source_context_proto_rawDescData
-}
-
-var file_google_protobuf_source_context_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_google_protobuf_source_context_proto_goTypes = []interface{}{
-	(*SourceContext)(nil), // 0: google.protobuf.SourceContext
-}
-var file_google_protobuf_source_context_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_google_protobuf_source_context_proto_init() }
-func file_google_protobuf_source_context_proto_init() {
-	if File_google_protobuf_source_context_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_google_protobuf_source_context_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SourceContext); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_google_protobuf_source_context_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_google_protobuf_source_context_proto_goTypes,
-		DependencyIndexes: file_google_protobuf_source_context_proto_depIdxs,
-		MessageInfos:      file_google_protobuf_source_context_proto_msgTypes,
-	}.Build()
-	File_google_protobuf_source_context_proto = out.File
-	file_google_protobuf_source_context_proto_rawDesc = nil
-	file_google_protobuf_source_context_proto_goTypes = nil
-	file_google_protobuf_source_context_proto_depIdxs = nil
-}