def process_autosummary_toc(app, doctree):
    """Insert items described in autosummary:: to the TOC tree, but do
    not generate the toctree:: list.
    """
    env = app.builder.env
    crawled = {}
    def crawl_toc(node, depth=1):
        crawled[node] = True
        for j, subnode in enumerate(node):
            try:
                if (isinstance(subnode, autosummary_toc)
                    and isinstance(subnode[0], addnodes.toctree)):
                    env.note_toctree(env.docname, subnode[0])
                    continue
            except IndexError:
                continue
            if not isinstance(subnode, nodes.section):
                continue
            if subnode not in crawled:
                crawl_toc(subnode, depth+1)
    crawl_toc(doctree)
Insert items described in autosummary:: to the TOC tree, but do
    not generate the toctree:: list.