--- /dev/null
+syntax = "proto2";
+
+import 'alltypes.proto';
+
+extend AllTypes {
+ optional int32 AllTypes_extensionfield1 = 255 [default = 5];
+}
+
+message ExtensionMessage {
+ extend AllTypes {
+ optional ExtensionMessage AllTypes_extensionfield2 = 254;
+ // required ExtensionMessage AllTypes_extensionfield3 = 253; // No longer allowed by protobuf 3
+ repeated ExtensionMessage AllTypes_extensionfield4 = 252;
+ }
+
+ required string test1 = 1;
+ required int32 test2 = 2;
+}
+