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Appetite of Private men, but the Law, which is the Will and Appetite of
，更多细节参见QuickQ
Using context and capabilities, we can implicitly pass our provider implementations through an implicit context. For our SerializeIterator example, we can use the with keyword to get a context value that has a generic Context type. But, for this specific use case, we only need the context type to implement the provider trait we are interested in, which is the SerializeImpl trait for our iterator's Items.
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