public virtual void PostWalk(ErrorExpr node) { }
// ErrorExpr
public virtual bool Walk(ErrorExpr node) { return true; }
// ErrorExpr
public override bool Walk(ErrorExpr node) { return false; }
public override void PostWalk(ErrorExpr node) { }
// ErrorExpr
public override bool Walk(ErrorExpr node)
{
node.Parent = _currentScope;
return base.Walk(node);
}