To expand the type space, Emacs uses a C pattern sometimes called "Poor Man's Inheritance" or struct embedding. By placing a common header as the very first field of a struct, a pointer can be cast to the header type, checked for its sub-type, and then cast to the specific object type.
CGP also provides the #[cgp_impl] macro to help us implement a provider trait easily as if we are writing blanket implementations. Compared to before, the example SerializeIterator provider shown here can use dependency injection through the generic context, and it can require the context to implement CanSerializeValue for the iterator's Items.
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而且这一轮涨价将长期持续。IDC数据预测，2026年中国手机市场旗舰机涨幅将突破30%，同配置机型比2025年贵300-1000元，大存储版本甚至贵2000元；3月后发布的新品，涨幅将在此基础上进一步扩大。