GenerateProtobufDefinition fails on interface

[tharvik]

I'm trying to find how onet.Roster is serialized by protobuf. Sadly, when encountering an interface, such as kyber.Point, it fails.

protobuf.GenerateProtobufDefinition(os.Stdout, []interface{}{
            new(onet.Roster),
}, nil, nil)

It would be nice to support it, such as using the Any prototype defined in proto3, or simply a reserved with a comment.

[jeffallen]

In onet/network/encoding.go, there are a series of protobuf.RegisterInterface calls that set up protobuf to handle this correctly; at least for decoding.

But yes, I agree that GenerateProtobufDefinition doesn't do this right.