public virtual void PostWalk(ComprehensionIf node) { }
// ComprehensionIf public virtual bool Walk(ComprehensionIf node) { return(true); }
public override void PostWalk(ComprehensionIf node) { }
// ComprehensionIf public override bool Walk(ComprehensionIf node) { return(Location >= node.StartIndex && Location <= node.EndIndex); }
// ComprehensionIf public override bool Walk(ComprehensionIf node) { return(false); }