'Set an UNBREAKABLE penalty annotation on children of node.'

def _SetUnbreakableOnChildren(self, node):

    for child in node.children:
        self.Visit(child)
    start = (2 if hasattr(node.children[0], 'is_pseudo') else 1)
    for i in py3compat.range(start, len(node.children)):
        _SetUnbreakable(node.children[i])
