@validation.warning(BOTH_CHILD_AND_ROOT)
    def _check_child_is_also_root(self):
        problems = []
        for c in self.children:
            if c.document is not None and c.document.roots in c:
                problems.append(str(c))
        if problems:
            return ", ".join(problems)
        else:
            return None
dataset/ETHPy150Open bokeh/bokeh/bokeh/models/layouts.py/BaseBox._check_child_is_also_root/swapped operands of `in`