public override void PostWalk(AnnotatedAssignStatement node)
 {
 }
 public virtual void PostWalk(AnnotatedAssignStatement node)
 {
 }
 // AnnotatedAssignStatement
 public override bool Walk(AnnotatedAssignStatement node)
 {
     return(false);
 }
 // AnnotatedAssignStatement
 public virtual bool Walk(AnnotatedAssignStatement node)
 {
     return(true);
 }