public void SetMetaTable(int idx)
{
var val = _stack[idx];
var mtVal = _stack.Pop();
if (mtVal is null)
{
LuaValue.SetMetaTable(val, null, this);
}
else if (mtVal.IsTable())
{
LuaValue.SetMetaTable(val, mtVal.GetTableValue(), this);
}
else
{
Debug.Panic("table expected!");
}
}