public override sealed object VisitExternAliasDirective(ExternAliasDirective externAliasDirective, object data)
 {
     this.BeginVisit(externAliasDirective);
     object result = this.TrackedVisitExternAliasDirective(externAliasDirective, data);
     this.EndVisit(externAliasDirective);
     return result;
 }
 public virtual object VisitExternAliasDirective(ExternAliasDirective externAliasDirective, object data)
 {
     Debug.Assert((externAliasDirective != null));
     return null;
 }
 public virtual object TrackedVisitExternAliasDirective(ExternAliasDirective externAliasDirective, object data)
 {
     return base.VisitExternAliasDirective(externAliasDirective, data);
 }
 public virtual object VisitExternAliasDirective(ExternAliasDirective externAliasDirective, object data)
 {
     throw new global::System.NotImplementedException("ExternAliasDirective");
 }