compiler/testdata/extension_user.proto

// Go support for Protocol Buffers - Google's data interchange format
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import "extension_base.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 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 {
    required UserMessage user_message = 16;
  }
}

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