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並前往https://books.google.com.tw/books?id=x1w4EAAAQBAJ&pg=PA249&lpg=PA249&dq=rust+unwrap&source=bl&ots=O0Ny00ma8H&sig=ACfU3U0emxZ-yAcJ5RxMi6RKfeXzitlsng&hl=zh-TW&sa=X&ved=2ahUKEwjO8IzKg4X1AhXsrpUCHYeCC_QQ6AF6BQi7AhAD

Rust in Action - 第 249 頁 - Google 圖書結果

61 } 62 63 64 } 65 " delete " = > a.delete ( key ) .unwrap ( ) , 66 67 68 = 69 " insert " = > { let value maybe_value . expect ( & USAGE ) .as_ref ( ) ...

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