Golang robust enum

cat_enum.go

package enums

// < ----- This is your core template
type CatEnum interface{
	enum() catEnumStruct
}

type catEnumStruct struct {}

func (c catEnumStruct) enum() catEnumStruct {
	return c
}
// ----->

// ----- Below are your enums which you can access publicly outside of the enum package -----
var (
  CatEnumStreet = catEnumStruct{}
  CatEnumTabby = catEnumStruct{}
  CatEnumUnknown = catEnumStruct{}
)

/*
Additionally, you must structure your project as follows:
/mypackage
/enums/cat_enum.go

The cat enum must be it's own package to avoid access to the private catEnumStruct to avoid implementing
additional types who can match the public CatEnum interface
*/