def METHOD_NAME(self, flatiter):
    """Rebuild a nested tuple structure.
    """
    vals = deque(flatiter)
    res = []
    cur = res
    stack = []
    for op in self._code:
        if op is _PUSH_LIST:
            stack.append(cur)
            cur.append([])
            cur = cur[-1]
        elif op is _APPEND_NEXT_VALUE:
            cur.append(vals.popleft())
        elif op is _APPEND_EMPTY_TUPLE:
            cur.append(())
        elif op is _POP:
            cur = stack.pop()
    assert not stack, stack
    assert not vals, vals
    return res