def clear(self):
        """Completely clear a Node of all its cached state (so that it
        can be re-evaluated by interfaces that do continuous integration
        builds).
        """
        # The del_binfo() call here isn't necessary for normal execution,
        # but is for interactive mode, where we might rebuild the same
        # target and need to start from scratch.
        self.del_binfo()
        self.clear_memoized_values()
        self.ninfo = self.new_ninfo()
        self.executor_cleanup()
        try:
            delattr(self, '_calculated_sig')
        except AttributeError:
            pass
        self.includes = None