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Китайские компании перестали покупать нефть у России. К чему это приведет?23 октября 2025
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Apple is kicking off multiple days of product announcements this morning with a new iPad Air. Unsurprisingly, it’s more or less like the iPad Air Apple announced one year ago, except it now has an M4 chip instead of last year’s M3.
Now that we've seen the problems with overlapping instances, let's look at the second coherence rule, which forbids orphan implementations. This restriction is most well-known for the following use case. On one hand, we have the serde crate, which defines the Serialize trait that is used pretty much everywhere. And then we have a library crate that defines a data type, say, a Person struct.，更多细节参见新收录的资料