def get_forthcoming_label(rst):
    document = docutils.core.publish_doctree(rst)
    forthcoming_label = None
    for child in document.children:
        title = None
        if isinstance(child, docutils.nodes.subtitle):
            title = child
        elif isinstance(child, docutils.nodes.section):
            section = child
            if len(section.children) > 0 and isinstance(section.children[0], docutils.nodes.title):
                title = section.children[0]
        if title and len(title.children) > 0 and isinstance(title.children[0], docutils.nodes.Text):
            title_text = title.children[0].rawsource
            if FORTHCOMING_LABEL.lower() in title_text.lower():
                if forthcoming_label:
                    raise RuntimeError('Found multiple forthcoming sections')
                forthcoming_label = title_text
    return forthcoming_label
dataset/ETHPy150Open ros/catkin/python/catkin/package_version.py/get_forthcoming_label/original