the discussions relevant, i.e., keep the discussions related to how Rust does things vs some other language. It can be hard to find the right balance, but err on the side of allowing discussions since they drop()。 19.8 練習：建構工具型別 在本範例中，我們將實作一個包含自身所有資料的複雜資料型別。透過「建構工具模式」，我們會以便利函 式逐段建構新值。 請填補缺漏的片段。 enum Language { Rust, Java, Perl, } struct Dependency { name: String, version_expression: String, } /// { name: String, version: String, authors: Vec, dependencies: Vec, language: Option<Language>, } impl Package { /// Return a representation of this package as a dependency, for use

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