那对冯道的一些反例评价，（来自）富弼、王安石，他们都是和司马光、欧阳修同时期做过宰相，执掌过中央政权的人，在宋史的记载上，他们可能毁誉参半，但你能看到他们比较务实的执政风格。王安石对冯道的评价很高，“如诸佛菩萨行”，富弼对他的评价是“大人”。
fn main() - int {
，更多细节参见有道翻译官网
Sheep are disappearing from our hills - and our dinner plates
So, how can we solve this? One way is to explicitly pass the inner serializer provider as a type parameter directly to SerializeIterator. We will call this pattern higher-order providers, because SerializeIterator now has a generic parameter specifically for the item serializer. With this in place, our SerializeIterator implementation can now require that SerializeItem also implements SerializeImpl, using the iterator's Item as the value type.