{"id":45684,"date":"2023-06-30T08:53:21","date_gmt":"2023-07-31T03:00:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45684-2\/"},"modified":"2024-04-30T11:21:24","modified_gmt":"2024-04-30T03:21:24","slug":"45684-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45684-2\/","title":{"rendered":""},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u306f Rust Advent Calendar 2021 \u306e 7\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n

\u7d50\u8ad6<\/h1>\n

\u3088\u304f\u5206\u304b\u3089\u306a\u3051\u308c\u3070\u3001anyhow::Error\u306b\u3057\u3066\u304a\u304f\u306e\u304c\u3088\u3055\u305d\u3046\u3002<\/p>\n

2021\/12\u73fe\u5728 Rust\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u3044\u3046\u306e\u306f\u5b9a\u307e\u3063\u3066\u3044\u306a\u3044\u3088\u3046\u3067\u3042\u308b\u3002
\n\u306a\u306e\u3067\u3001Rust\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u304c\u3053\u308c\u304b\u3089\u3069\u3046\u306a\u3063\u3066\u3044\u304f\u306e\u304b\u306f\u6ce8\u8996\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/div>\n

Rust\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u30ad\u30db\u30f3<\/h1>\n

Rust\u3092\u52c9\u5f37\u3057\u3066\u3044\u304f\u3046\u3061\u306b\u3001\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306f\u3069\u3046\u3084\u3089Result<T, E>\u3068\u3044\u3046\u3082\u306e\u3092\u4f7f\u3046\u3088\u3046\u3060\u3068\u3044\u3046\u3053\u3068\u304c\u5206\u304b\u308b\u3002Result<T, E>\u3092\u8fd4\u3059\u95a2\u6570\u5185\u3067\u306f?\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u304c\u4f7f\u3048<\/p>\n

\u4e0b\u8a18\u306e\u30b3\u30fc\u30c9\u304c<\/p>\n

use<\/span> std<\/span>::<\/span>fs<\/span>::<\/span>OpenOptions<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>::<\/span>prelude<\/span>::<\/span>*<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>path<\/span>::<\/span>Path<\/span>;<\/span>\r\n\r\nfn<\/span> write<\/span>(<\/span>filename<\/span>:<\/span> impl<\/span> AsRef<\/span><<\/span>Path<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>(),<\/span> io<\/span>::<\/span>Error<\/span>><\/span> {<\/span>\r\n    let<\/span> mut<\/span> file<\/span> =<\/span> match<\/span> OpenOptions<\/span>::<\/span>new<\/span>()<\/span>.write<\/span>(<\/span>true<\/span>)<\/span>.open<\/span>(<\/span>filename<\/span>)<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>file<\/span>)<\/span> =><\/span> file<\/span>,<\/span>\r\n        Err<\/span>(<\/span>e<\/span>)<\/span> =><\/span> return<\/span> Err<\/span>(<\/span>From<\/span>::<\/span>from<\/span>(<\/span>e<\/span>)),<\/span> \/\/ \u3053\u306e\u30b3\u30fc\u30c9\u3067From::from\u306f\u4e0d\u8981\u3067\u3059\u304c\u3001?\u306e\u52d5\u4f5c\u306edesugar\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u66f8\u3044\u3066\u3044\u307e\u3059\u3002<\/span>\r\n    };<\/span>\r\n    match<\/span> file<\/span>.write_all<\/span>(<\/span>b<\/span>\"Hello, world!\"<\/span>)<\/span> {<\/span>\r\n        Ok<\/span>(<\/span>ok<\/span>)<\/span> =><\/span> ok<\/span>,<\/span>\r\n        Err<\/span>(<\/span>e<\/span>)<\/span> =><\/span> return<\/span> Err<\/span>(<\/span>From<\/span>::<\/span>from<\/span>(<\/span>e<\/span>)),<\/span>\r\n    };<\/span>\r\n    Ok<\/span>(())<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
?\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u3092\u4f7f\u3063\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
use<\/span> std<\/span>::<\/span>fs<\/span>::<\/span>OpenOptions<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>io<\/span>::<\/span>prelude<\/span>::<\/span>*<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>path<\/span>::<\/span>Path<\/span>;<\/span>\r\n\r\nfn<\/span> write<\/span>(<\/span>filename<\/span>:<\/span> impl<\/span> AsRef<\/span><<\/span>Path<\/span>><\/span>)<\/span> -><\/span> Result<\/span><<\/span>(),<\/span> io<\/span>::<\/span>Error<\/span>><\/span> {<\/span>\r\n    let<\/span> mut<\/span> file<\/span> =<\/span> OpenOptions<\/span>::<\/span>new<\/span>()<\/span>.write<\/span>(<\/span>true<\/span>)<\/span>.open<\/span>(<\/span>filename<\/span>)<\/span>?<\/span>;<\/span>\r\n    file<\/span>.write_all<\/span>(<\/span>b<\/span>\"Hello, world!\"<\/span>)<\/span>?<\/span>;<\/span>\r\n    Ok<\/span>(())<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u304b\u306a\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u30a8\u30e9\u30fc\u4f1d\u642c\u304c\u884c\u3048\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u3060\u308d\u3046\u3002\u3053\u308c\u306fRust\u306e\u5b09\u3057\u3044\u70b9\u306e\uff11\u3064\u3060\u3002
\n\u3055\u3089\u306b\u5024\u304c\u30a8\u30e9\u30fc\u306e\u5834\u5408\u3001\u3082\u3057\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u3068\u623b\u308a\u5024\u306e\u30a8\u30e9\u30fc\u304c\u7570\u306a\u3063\u3066\u3044\u3066\u3082\u3001\u767a\u751f\u3057\u305f\u30a8\u30e9\u30fc\u304c\u623b\u308a\u5024\u306e\u30a8\u30e9\u30fc\u306b\u5bfe\u3057\u3066From\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308c\u3070\u3001\u30a8\u30e9\u30fc\u3092\u623b\u308a\u5024\u306e\u30a8\u30e9\u30fc(\u3053\u306e\u5834\u5408\u306fio::Error)\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u308b\u3002<\/p>\n
\u3059\u3070\u3089\u3057\u3044\u3002\u3002\u300c\u4f8b\u5916\u306a\u3093\u3066\u3044\u3089\u3093\u304b\u3063\u305f\u3093\u3084?\u300d\u3068\u601d\u3046\u308f\u3051\u3060\u3051\u304c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7591\u554f\u304c\u6d6e\u304b\u3093\u3067\u304f\u308b\u3002<\/p>\n
    \n
  • \n
      \u968e\u5c64\u3092\u6301\u3064\u30a8\u30e9\u30fc\u306f\u3069\u3046\u3084\u3063\u3066\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4fdd\u3064\u306e\u304b<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \u3042\u308b\u95a2\u6570\u3067\u8907\u6570\u306e\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u3001E\u306f\u306a\u306b\u306b\u3057\u305f\u3089\u3088\u3044\u306e\u304b<\/ul>\n
        \u307e\u305a\u6700\u521d\u306e\u7591\u554f\u304b\u3089\u898b\u3066\u3044\u304f\u3002\u3053\u306e\u7591\u554f\u306b\u7b54\u3048\u308b\u305f\u3081\u306b\u306f\u3001\u307e\u305aError\u30c8\u30ec\u30a4\u30c8\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n
        \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u4fdd\u6301<\/h1>\n
        Error\u30c8\u30ec\u30a4\u30c8<\/h2>\n
        Rust\u306b\u306fError\u3068\u3044\u3046\u30c8\u30ec\u30a4\u30c8\u304c\u3042\u308b\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u3060\u3002<\/p>\n
        pub<\/span> trait<\/span> Error<\/span>:<\/span> Debug<\/span> +<\/span> Display<\/span> {<\/span>\r\n    fn<\/span> source<\/span>(<\/span>&<\/span>self<\/span>)<\/span> =><\/span> Option<\/span><&<\/span>(<\/span>dyn<\/span> Error<\/span> +<\/span> 'static<\/span>)<\/span>><\/span> {<\/span>\r\n        None<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u79c1\u306f\u6700\u521d\u52d8\u9055\u3044\u3057\u3066\u3044\u305f\u306e\u3060\u304c\u3001Result<T, E>\u306f\u5225\u306bE\u304cError\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3092\u8981\u6c42\u3057\u3066\u306a\u3044\u3002\u5225\u306bString\u3067\u3082()\u3067\u3082\u306a\u3093\u3067\u3082\u3044\u3044\u306e\u3067\u3042\u308b\u3002
        \n\u3067\u306f\u3053\u306eError\u30c8\u30ec\u30a4\u30c8\u306f\u306a\u3093\u306e\u305f\u3081\u306b\u5b58\u5728\u3057\u3066\u3044\u308b\u306e\u3060\u308d\u3046\u304b\u3002<\/p>\n
        Error\u30c8\u30ec\u30a4\u30c8\u306e\u5f79\u5272<\/h3>\n
        Error\u30c8\u30ec\u30a4\u30c8\u306b\u306f3\u3064\u306e\u5f79\u5272\u304c\u3042\u308b\u3002
        \n1. \u30a8\u30e9\u30fc\u306e\u30de\u30fc\u30ab\u30fc
        \n2. \u8868\u793a\u65b9\u6cd5\u306e\u63d0\u4f9b
        \n3. \u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u306e\u8868\u73fe<\/p>\n
        \u30a8\u30e9\u30fc\u306e\u30de\u30fc\u30ab\u30fc<\/h4>\n
        Error\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u578b\u306f\u3001\u30a8\u30e9\u30fc\u3092\u8868\u73fe\u3059\u308b\u3082\u306e\u3067\u3042\u308b\u3053\u3068\u3092\u8868\u73fe\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3060\u3002<\/p>\n
        \u8868\u793a\u65b9\u6cd5<\/h4>\n
        Error\u30c8\u30ec\u30a4\u30c8\u306fDebug\u3068Display\u306e\u5b9f\u88c5\u3092\u8981\u6c42\u3057\u3066\u3044\u308b\u3002\u5f93\u3063\u3066Error\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u69cb\u9020\u4f53\u306f\u4f8b\u3048\u3070println!(“{}”, e);\u3084println!(“{:?}”, e);\u3068\u3059\u308c\u3070\u30a8\u30e9\u30fc\u3092\u8868\u793a\u3067\u304d\u308b\u3002<\/p>\n
        \u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u306e\u8868\u73fe<\/h4>\n
        Error\u30c8\u30ec\u30a4\u30c8\u306fsource\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3063\u3066\u3044\u308b\u3002\u30a8\u30e9\u30fc\u304c\u305d\u306e\u30bd\u30fc\u30b9\u3092\u6301\u3063\u3066\u3044\u305f\u5834\u5408sorce\u30c8\u30ec\u30a4\u30c8\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3002Error\u30c8\u30ec\u30a4\u30c8\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u4f7f\u7528\u4f8b\u3092\u5f15\u7528\u3059\u308b\u3002<\/p>\n
        use<\/span> std<\/span>::<\/span>error<\/span>::<\/span>Error<\/span>;<\/span>\r\nuse<\/span> std<\/span>::<\/span>fmt<\/span>;<\/span>\r\n\r\n#[derive(Debug)]<\/span>\r\nstruct<\/span> SuperError<\/span> {<\/span>\r\n    side<\/span>:<\/span> SuperErrorSideKick<\/span>,<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> fmt<\/span>::<\/span>Display<\/span> for<\/span> SuperError<\/span> {<\/span>\r\n    fn<\/span> fmt<\/span>(<\/span>&<\/span>self<\/span>,<\/span> f<\/span>:<\/span> &<\/span>mut<\/span> fmt<\/span>::<\/span>Formatter<\/span><<\/span>'_<\/span>><\/span>)<\/span> -><\/span> fmt<\/span>::<\/span>Result<\/span> {<\/span>\r\n        write!<\/span>(<\/span>f<\/span>,<\/span> \"SuperError is here!\"<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> Error<\/span> for<\/span> SuperError<\/span> {<\/span>\r\n    fn<\/span> source<\/span>(<\/span>&<\/span>self<\/span>)<\/span> -><\/span> Option<\/span><&<\/span>(<\/span>dyn<\/span> Error<\/span> +<\/span> 'static<\/span>)<\/span>><\/span> {<\/span>\r\n        Some<\/span>(<\/span>&<\/span>self<\/span>.side<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n#[derive(Debug)]<\/span>\r\nstruct<\/span> SuperErrorSideKick<\/span>;<\/span>\r\n\r\nimpl<\/span> fmt<\/span>::<\/span>Display<\/span> for<\/span> SuperErrorSideKick<\/span> {<\/span>\r\n    fn<\/span> fmt<\/span>(<\/span>&<\/span>self<\/span>,<\/span> f<\/span>:<\/span> &<\/span>mut<\/span> fmt<\/span>::<\/span>Formatter<\/span><<\/span>'_<\/span>><\/span>)<\/span> -><\/span> fmt<\/span>::<\/span>Result<\/span> {<\/span>\r\n        write!<\/span>(<\/span>f<\/span>,<\/span> \"SuperErrorSideKick is here!\"<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nimpl<\/span> Error<\/span> for<\/span> SuperErrorSideKick<\/span> {}<\/span>\r\n\r\nfn<\/span> get_super_error<\/span>()<\/span> -><\/span> Result<\/span><<\/span>(),<\/span> SuperError<\/span>><\/span> {<\/span>\r\n    Err<\/span>(<\/span>SuperError<\/span> {<\/span> side<\/span>:<\/span> SuperErrorSideKick<\/span> })<\/span>\r\n}<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n    match<\/span> get_super_error<\/span>()<\/span> {<\/span>\r\n        Err<\/span>(<\/span>e<\/span>)<\/span> =><\/span> {<\/span>\r\n            println!<\/span>(<\/span>\"Error: {}\"<\/span>,<\/span> e<\/span>);<\/span>\r\n            println!<\/span>(<\/span>\"Caused by: {}\"<\/span>,<\/span> e<\/span>.source<\/span>()<\/span>.unwrap<\/span>());<\/span>\r\n        }<\/span>\r\n        _<\/span> =><\/span> println!<\/span>(<\/span>\"No error\"<\/span>),<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        Error: SuperError is here!\r\nCaused by: SuperErrorSideKick is here!\r\n<\/code><\/pre>\n
        e.source()\u3092\u547c\u3076\u3053\u3068\u3067SuperError\u306e\u539f\u56e0\u3067\u3042\u308bSuperSideError\u3092\u53d6\u5f97\u3067\u304d\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308b\u3060\u308d\u3046\u3002<\/p>\n
        \u307e\u305f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u518d\u5e30\u7684\u306bsource\u3092\u547c\u3079\u3070\u30a8\u30e9\u30fc\u306e\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u30d7\u30ea\u30f3\u30c8\u3067\u304d\u308b\u3002<\/p>\n
           \/\/ \u30102021\/12\/29\u3011let e -> let mut e\u306b\u4fee\u6b63\u3000@nobkz\u3055\u3093\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\u3002<\/span>\r\n   let<\/span> mut<\/span> e<\/span> =<\/span> e<\/span>.source<\/span>();<\/span>\r\n   while<\/span> let<\/span> Some<\/span>(<\/span>cause<\/span>)<\/span> =<\/span> e<\/span> {<\/span>\r\n       println!<\/span>(<\/span>\"Caused by: {}\"<\/span>,<\/span> cause<\/span>);<\/span>\r\n       e<\/span> =<\/span> cause<\/span>.source<\/span>();<\/span>\r\n   }<\/span>\r\n<\/code><\/pre>\n
        \u305f\u3060\u3057\u3001\u3053\u308c\u306f\u3042\u307e\u308a\u306b\u3082\u30df\u30b9\u3059\u308b\u306e\u304c\u7c21\u5358\u306a\u305f\u3081\u3001Rust\u516c\u5f0f\u3068\u3057\u3066\u3082\u3063\u3068\u7c21\u5358\u306b\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u30d7\u30ea\u30f3\u30c8\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3088\u3046\u3068\u3059\u308b\u52d5\u304d\u304c\u3042\u308b\u3088\u3046\u3067\u3042\u308b\u3002
        \n\u307e\u305f\u3001eyre\u3068\u3044\u3046\u30af\u30ec\u30fc\u30c8\u3092\u4f7f\u3046\u3068\u7c21\u5358\u306b\u30b3\u30f3\u30c6\u30af\u30b9\u30c8\u3092\u51fa\u529b\u3067\u304d\u308b\u3088\u3046\u3067\u3042\u308b\u3002<\/p>\n
        \u95a2\u6570\u5185\u3067\u8907\u6570\u306e\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3046\u308b\u5834\u5408<\/h1>\n
        \u6b21\u306b\u30012\u3064\u3081\u306e\u7591\u554f\u3067\u3042\u308b\u95a2\u6570\u3067\u8907\u6570\u306e\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u3069\u3046\u3057\u305f\u3089\u3044\u3044\u306e\u304b\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304f\u3002
        \n\u3053\u308c\u306b\u306f2\u7a2e\u985e\u306e\u624b\u6cd5\u304c\u3042\u308b\u3002Enum\u3092\u4f7f\u3046\u65b9\u6cd5\u3068Box\u3092\u4f7f\u3046\u65b9\u6cd5\u3060\u3002<\/p>\n
        Enum<\/h2>\n
        \uff11\u3064\u76ee\u306e\u624b\u6cd5\u306fEnum\u3092\u4f7f\u3046\u65b9\u6cd5\u3067\u3042\u308b\u3002\u4f8b\u3068\u3057\u3066sqlx::Error\u306e\u629c\u7c8b\u3092\u793a\u3059\u3002<\/p>\n
        pub<\/span> enum<\/span> Error<\/span> {<\/span>\r\n    \/\/\/ Error occurred while parsing a connection string.<\/span>\r\n    Configuration<\/span>(<\/span>BoxDynError<\/span>),<\/span>\r\n\r\n    \/\/\/ Error returned from the database.<\/span>\r\n    Database<\/span>(<\/span>Box<\/span><<\/span>dyn<\/span> DatabaseError<\/span>><\/span>),<\/span>\r\n\r\n    \/\/\/ Error communicating with the database backend.<\/span>\r\n    Io<\/span>(<\/span>io<\/span>::<\/span>Error<\/span>),<\/span>\r\n\r\n    Tls<\/span>(<\/span>BoxDynError<\/span>),<\/span>\r\n\r\n    \/\/\/.....\u7701\u7565<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        https:\/\/github.com\/launchbadge\/sqlx\/blob\/master\/sqlx-core\/src\/error.rs \u304b\u3089\u6539\u5909\u30fb\u629c\u7c8b\u3057\u3066\u5f15\u7528<\/p>\n
        \u3053\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u3092\u5b9a\u7fa9\u3057\u3066\u3001Enum\u306e\u69cb\u6210\u8981\u7d20\u305d\u308c\u305e\u308c\u306b\u5bfe\u3057\u3066From\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3059\u308c\u3070\u3001?\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u3092\u4f7f\u3063\u3066\u3001\u8907\u6570\u306e\u30a8\u30e9\u30fc\u3092\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
        impl<\/span> From<\/span><<\/span>io<\/span>::<\/span>Error<\/span>><\/span> for<\/span> Error<\/span> {<\/span>\r\n    fn<\/span> from<\/span>(<\/span>e<\/span>:<\/span> io<\/span>::<\/span>Error<\/span>)<\/span> -><\/span> Self<\/span> {<\/span>\r\n        Self<\/span>::<\/span>Io<\/span>(<\/span>e<\/span>)<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
        \u3055\u3089\u306b\u3053\u306eError\u3092\u30a8\u30e9\u30fc\u306b\u3059\u308b\u305f\u3081\u306b\u306fError\u30c8\u30ec\u30a4\u30c8\u306e\u5b9f\u88c5\u3092\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002
        \nDebug\u306fderive\u30de\u30af\u30ed\u3067\u81ea\u52d5\u5c0e\u51fa\u3067\u304d\u308b\u304c\u3001Display\u306f\u624b\u3067\u5b9f\u88c5\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/p>\n
        \u307e\u305f\u30a8\u30e9\u30fc\u306e\u30bd\u30fc\u30b9\u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067source\u95a2\u6570\u3082\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u305f\u307b\u3046\u304c\u3044\u3044\u3060\u308d\u3046\u3002
        \n\u307e\u3068\u3081\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u4f5c\u696d\u304c\u5fc5\u8981\u3067\u3042\u308b\u3002<\/p>\n
          \n
        1. \n
            \u5404\u69cb\u6210\u8981\u7d20\u306bFrom\u30c8\u30ec\u30a4\u30c8\u306e\u5b9f\u88c5<\/ol>\n<\/li>\n<\/ol>\n
            Error\u30c8\u30ec\u30a4\u30c8\u306e\u5b9f\u88c5(source\u95a2\u6570\u306e\u5b9f\u88c5\u3068Display\u30c8\u30ec\u30a4\u30c8\u306e\u5b9f\u88c5\u3068Debug\u306e\u5c0e\u51fa)<\/p>\n
            \u3053\u308c\u306f\u7d50\u69cb\u9762\u5012\u306a\u4f5c\u696d\u306a\u306e\u3067\u3001\u30de\u30af\u30ed\u3067\u3053\u306e\u3088\u3046\u306a\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u3092\u751f\u6210\u3057\u3066\u304f\u308c\u308bthiserror\u3068\u3044\u3046\u30af\u30ec\u30fc\u30c8\u304c\u5b58\u5728\u3059\u308b\u3002<\/p>\n
            \u30e1\u30ea\u30c7\u30e1\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308b\u3060\u308d\u3046\u3002<\/p>\n
            \u30e1\u30ea\u30c3\u30c8<\/h3>\n
              \u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u3067\u305d\u306e\u69cb\u6210\u8981\u7d20\u3092\u53d6\u5f97\u3067\u304d\u308b\u3053\u3068\u3002<\/ul>\n
              \u30c7\u30e1\u30ea\u30c3\u30c8<\/h3>\n
                \n
              • \n
                  \u5b9f\u88c5\u304c\u9762\u5012\u306a\u3053\u3068\u3002<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \u65b0\u3057\u3044\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u305f\u3044\u5834\u5408\u306b\u3001Enum\u3092\u62e1\u5f35\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3053\u3068\u3002<\/ul>\n
                    Box<\/h2>\n
                    \u3082\u3046\u4e00\u3064\u306e\u65b9\u6cd5\u306fBox\u3092\u4f7f\u3046\u3053\u3068\u3060\u3002Result<T, E>\u306eE\u3092Box\u306b\u3057\u3066\u304a\u3051\u3070\u3001\u7c21\u5358\u306b\u8907\u6570\u306e\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u306b\u5bfe\u51e6\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u306a\u305c\u306a\u3089Box\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u88c5\u304c\u3055\u308c\u3066\u3044\u308b\u304b\u3089\u3067\u3042\u308b\u3002<\/p>\n
                    impl<\/span><<\/span>'a<\/span>,<\/span> E<\/span>:<\/span> Error<\/span> +<\/span> 'a<\/span>><\/span> From<\/span><<\/span>E<\/span>><\/span> for<\/span> Box<\/span><<\/span>dyn<\/span> Error<\/span> +<\/span> 'a<\/span>><\/span>\r\nimpl<\/span><<\/span>'a<\/span>,<\/span> E<\/span>:<\/span> Error<\/span> +<\/span> Send<\/span> +<\/span> Sync<\/span> +<\/span> 'a<\/span>><\/span> From<\/span><<\/span>E<\/span>><\/span> for<\/span> Box<\/span><<\/span>dyn<\/span> Error<\/span> +<\/span> Send<\/span> +<\/span> Sync<\/span> +<\/span> 'a<\/span>><\/span>\r\n<\/code><\/pre>\n
                    \u3064\u307e\u308a\u3001Error\u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u305f\u578b\u306f\u305d\u308c\u3092Box\u5316\u3057\u305f\u578b\u306b\u5909\u63db\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3042\u308b\u3002<\/p>\n
                    \u307e\u305f\u3001Send\u3001Sync\u3001’static\u5883\u754c\u306f\u5fc5\u9808\u3067\u306f\u306a\u3044\u304c\u3001\u53ef\u80fd\u306a\u3089\u3064\u3051\u3066\u304a\u3044\u305f\u65b9\u304c\u3044\u3044\u3002
                    \n\u306a\u305c\u306a\u3089\u3001Send\u3068Sync\u3092\u3064\u3051\u306a\u3044\u3068\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u7528\u3044\u308b\u3053\u3068\u304c\u96e3\u3057\u304f\u306a\u308b\u3057\u3001’static\u3092\u3064\u3051\u3066\u3044\u306a\u3044\u3068downcast_ref\u3067Box\u5316\u3055\u308c\u3066\u3044\u308b\u5177\u4f53\u7684\u306a\u5024\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u304f\u306a\u308b\u304b\u3089\u3067\u3042\u308b\u3002<\/p>\n
                    Box\u306e\u5f37\u5316\u7248?\u3068\u3057\u3066anyhow\u3068\u3044\u3046\u30af\u30ec\u30fc\u30c8\u304c\u3042\u308b\u3002
                    \n\u307e\u305f\u3001anyhow\u306e\u30d5\u30a9\u30fc\u30af\u3067\u3001\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3055\u308c\u305f\u30a8\u30e9\u30fc\u5831\u544a\u6a5f\u80fd\u304c\u3064\u3044\u305feyre\u3068\u3044\u3046\u30af\u30ec\u30fc\u30c8\u3082\u3042\u308b\u3088\u3046\u3067\u3042\u308b\u3002<\/p>\n
                    \u30e1\u30ea\u30c7\u30e1\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308b\u3060\u308d\u3046\u3002<\/p>\n
                    \u30e1\u30ea\u30c3\u30c8<\/h3>\n
                      \u5b9f\u88c5\u304c\u697d\u306a\u3053\u3068\u3002<\/ul>\n
                      \u30c7\u30e1\u30ea\u30c3\u30c8<\/h3>\n
                        \n
                      • \n
                          \u8a73\u7d30\u306a\u5024\u306e\u53d6\u5f97\u304c\u96e3\u3057\u3044\u3053\u3068\u3002<\/ul>\n<\/li>\n<\/ul>\n
                          downcast_ref\u3068\u3044\u3046\u95a2\u6570\u3067\u8a73\u7d30\u306e\u5024\u3092\u5f97\u308b\u3053\u3068\u306f\u53ef\u80fd\u3060\u304c\u3001\u3053\u306e\u95a2\u6570\u3092\u591a\u7528\u3059\u308b\u3088\u3046\u306a\u3089\u3001Enum\u3067\u30a8\u30e9\u30fc\u3092\u69cb\u6210\u3057\u305f\u307b\u3046\u304c\u826f\u3055\u305d\u3046\u3060\u3002<\/p>\n
                          \u307e\u3068\u3081 Result<T, E>\u306eE\u306f\u4f55\u306b\u3059\u308b\u306e\u304c\u3088\u3044\u304b<\/h1>\n
                          \u30a8\u30e9\u30fc\u306e\u5024\u304c\u5358\u4e00\u306a\u3089\u597d\u304d\u306b\u3057\u305f\u3089\u3044\u3044\u3060\u308d\u3046\u3002\u305f\u3060\u3057\u3001Box\u5316\u3055\u308c\u305f\u30a8\u30e9\u30fc\u306b\u5909\u63db\u3067\u304d\u308b\u3088\u3046\u306bError\u30c8\u30ec\u30a4\u30c8\u306f\u5b9f\u88c5\u3057\u305f\u65b9\u304c\u3088\u3044\u3002<\/p>\n
                          \u8907\u6570\u306e\u7a2e\u985e\u306e\u30a8\u30e9\u30fc\u304c\u8fd4\u3055\u308c\u308b\u5834\u5408\u306fEnum(thiserror)\u3092\u4f7f\u3046\u304bBox(anyhow, eyre)\u3092\u4f7f\u3046\u304b\u306e\u9078\u629e\u80a2\u304c\u3042\u308b\u3002
                          \n\u30a8\u30e9\u30fc\u306e\u8a73\u7d30\u306e\u5024\u3092\u6271\u3044\u305f\u3044\u5834\u5408\u306fEnum\u3001\u305f\u3060\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3057\u305f\u3044\u3060\u3051\u306e\u3068\u304d\u306fBox\u3092\u4f7f\u3046\u3068\u3044\u3046\u306e\u304c\u5224\u65ad\u57fa\u6e96\u3060\u308d\u3046\u304b\u3002
                          \n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u305f\u3060\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3057\u305f\u3044\u3068\u3044\u3046\u3053\u3068\u304c\u591a\u3044\u306e\u3067Box(anyhow, eyre)\u3092\u4f7f\u3046\u306e\u304c\u5b89\u5b9a\u306a\u3053\u3068\u304c\u591a\u304f\u3001\u9006\u306b\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u5834\u5408\u306f\u3001\u306a\u308b\u3079\u304f\u67d4\u8edf\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081Enum(thiserror)\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u3088\u3046\u3067\u3042\u308b\u3002<\/p>\n
                          \u7d50\u8ad6\u3068\u3057\u3066\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u66f8\u304f\u4eba\u3088\u308a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u66f8\u304f\u4eba\u306e\u65b9\u304c\u591a\u3044\u3053\u3068\u3068\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u66f8\u304f\u4eba\u306fRust\u306b\u3064\u3044\u3066\u8a73\u3057\u3044\u4eba\u304c\u591a\u3044\u3068\u3044\u3046\u3053\u3068\u3092\u8003\u3048\u308b\u3068\u3001\u60a9\u3093\u3060\u3089anyhow\u3092\u4f7f\u3046\u306e\u304c\u5b89\u5b9a\u306e\u5834\u5408\u304c\u591a\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3060\u308d\u3046\u3002<\/p>\n
                          \u53c2\u8003\u6587\u732e<\/h1>\n
                            \n
                          • \n
                              What the Error Handling Project Group is Working Towards https:\/\/blog.rust-lang.org\/inside-rust\/2021\/07\/01\/What-the-error-handling-project-group-is-working-towards.html<\/ul>\n<\/li>\n<\/ul>\n
                              RustConf 2020 – Error handling Isn’t All About Errors by Jane Lusby https:\/\/www.youtube.com\/watch?v=rAF8mLI0naQ<\/p>\n
                              Jon Gjengset, Rust for Rustaceans, no strech press https:\/\/nostarch.com\/rust-rustaceans<\/p>\n
                              Error Handling In Rust – A Deep Dive https:\/\/www.lpalmieri.com\/posts\/error-handling-rust\/
                              \nRust \u30a8\u30e9\u30fc\u51e6\u74062020 https:\/\/cha-shu00.hatenablog.com\/entry\/2020\/12\/08\/060000<\/p>\n","protected":false},"excerpt":{"rendered":"
                              \u3053\u306e\u8a18\u4e8b\u306f Rust Advent Calendar 2021 \u306e 7\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002 \u7d50\u8ad6 \u3088\u304f\u5206\u304b\u3089\u306a\u3051\u308c […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45684","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/45684-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u3053\u306e\u8a18\u4e8b\u306f Rust Advent Calendar 2021 \u306e 7\u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002 \u7d50\u8ad6 \u3088\u304f\u5206\u304b\u3089\u306a\u3051\u308c […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/45684-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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