patrol-gamble-mobile/node_modules/protocol-buffers-schema/test/fixtures/extend.proto

message MsgNormal {
	required int32 field1 = 1;
	optional string field2 = 2;
	required int32 field3 = 3;
	optional int32 exField1 = 101;
	optional string exField2 = 102;
}

message MsgExtend {
	required int32 field1 = 1;
	optional string field2 = 2;
	required int32 field3 = 3;
	extensions 100 to 200;
}

extend MsgExtend {
	optional int32 exField1 = 101;
	optional string exField2 = 102;
}