/**
     * An enum class to specify the distance of scopes from an element as a partial order
     *
     * Example:
     *   import ... // scope1  FirExplicitSimpleImportingScope - enum entry: ExplicitSimpleImporting
     *   // scope2  FirPackageMemberScope - enum entry: PackageMember
     *   class Outer { // scope3  FirClassUseSiteMemberScope - enum entry: ClassUseSite