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println(f"\nTotal value: {tree_sum(tree)}");
。业内人士推荐新收录的资料作为进阶阅读
Employee { name: "Grace", department: "design", salary: 105000, years: 6 },。新收录的资料是该领域的重要参考
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Copy makes it trivially easy to accidentally duplicate a Rust value that is actually a thin handle to a resource, resulting in null pointers. Just make a habit of avoiding it on exported wrappers. This can be a hard muscle memory to break since we usually want Copy wherever possible in normal Rust code.