[protobuf] Using enum as extension id?

[crotty . christopher]

Is it possible to define an extension and use an enum value as the 
extension id?

Say with the following files defined:

*file: MessageType.proto:*

enum MessageType {
    MSG_TYPE_1 = 100;
    MSG_TYPE_2 = 101;
}


*file: AMessage.proto:*

import "MessageType.proto";

message AMessage {
    required MessageType  type = 1;
    extensions 100 to 200;
}


*file: MessageType1.proto:*

import "MessageType.proto";
import "AMessage.proto";

message MessageType1 {
  extend AMessage {
    required MessageType1  ext_type = 100;  // here I would like to use 
MessageType.MSG_TYPE_1
  }
}

Is it possible to use an enum definition in the extension definition?  I 
keep getting an error from protoc saying it is expecting a field number.

Thanks, 
Chris

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