Hi,

When using a message which contains a message with a oneof variable and using the setting to generate compare methods, the generated interface for the variable does not have the Compare() function generated as part of the interface.

Here is a gist which reproduces the error:

https://gist.github.com/johanbrandhorst/783e0908940a2f81d7aef7b1ac93472e

The offending line is my.pb.go:44:

type isValue_Type interface {
    isValue_Type()
}

Should be

type isValue_Type interface {
    isValue_Type()
    Compare(interface{}) int
}