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