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I’m actually more annoyed by Rust on this one (see earlier comment about naming being important). &mut isn’t “just” a mutable reference; it’s an exclusive reference, which happens to make direct mutability viable, but the semantics are more about exclusivity. ↩
，这一点在新收录的资料中也有详细论述
is also an option, and there are many other approaches.，更多细节参见PDF资料
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if records[i].value max_val {