public override bool Walk(ForStatement node)
{
_stack.EnterDeclared();
AddVarSymbolRecursive(node.Left);
node.List?.Walk(this);
node.Body?.Walk(this);
_stack.ExitDeclaredAndMerge();
_stack.EnterDeclared();
node.Else?.Walk(this);
_stack.ExitDeclaredAndMerge();
return(false);
}