def descendantOf(self, node, ancestors, stop=None):
        for a in ancestors: 
            try:
                p = self.lowestCommonAncestor(node, a, stop)
                if not p is stop:
                    return True
            except __HOLE__:
                # Skip some bogus objects like <_ast.Pass>
                pass
        return False
dataset/ETHPy150Open kevinw/pyflakes/pyflakes/checker.py/Checker.descendantOf