let query = "duct"; let contents = "\ Rust: safe, fast, productive. Pick three."; assert_eq!(vec!["safe, fast, productive."], search(query, contents)); } } 示例 12-15：创建一个我们期望的 vector 的 265/562Rust 程序设计语言 简体中文版 search 函数定义，如示例 12-16 所示。然后这个测试应该能够编译并因为空 vector 并不匹配 一个包含一行 "safe, fast, productive." 的 vector 而失败。 文件名：src/lib.rs pub fn search<'a>(query: &str, contents: &'a str) -> 'tests::one_result' panicked at src/lib.rs:44:9: assertion `left == right` failed left: ["safe, fast, productive."] right: [] note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace