dex/vendor/github.com/golang/protobuf/protoc-gen-go/testdata/extension_user.proto

// Go support for Protocol Buffers - Google's data interchange format
//
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// https://github.com/golang/protobuf
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syntax = "proto2";

import "extension_base.proto";
import "extension_extra.proto";

package extension_user;

message UserMessage {
  optional string name = 1;
  optional string rank = 2;
}

// Extend with a message
extend extension_base.BaseMessage {
  optional UserMessage user_message = 5;
}

// Extend with a foreign message
extend extension_base.BaseMessage {
  optional extension_extra.ExtraMessage extra_message = 9;
}

// Extend with some primitive types
extend extension_base.BaseMessage {
  optional int32 width = 6;
  optional int64 area = 7;
}

// Extend inside the scope of another type
message LoudMessage {
  extend extension_base.BaseMessage {
    optional uint32 volume = 8;
  }
  extensions 100 to max;
}

// Extend inside the scope of another type, using a message.
message LoginMessage {
  extend extension_base.BaseMessage {
    optional UserMessage user_message = 16;
  }
}

// Extend with a repeated field
extend extension_base.BaseMessage {
  repeated Detail detail = 17;
}

message Detail {
  optional string color = 1;
}

// An extension of an extension
message Announcement {
  optional string words = 1;
  extend LoudMessage {
    optional Announcement loud_ext = 100;
  }
}

// Something that can be put in a message set.
message OldStyleParcel {
  extend extension_base.OldStyleMessage {
    optional OldStyleParcel message_set_extension = 2001;
  }

  required string name = 1;
  optional int32 height = 2;
}