{"id":45605,"date":"2023-04-10T16:33:46","date_gmt":"2023-12-02T08:45:00","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45605-2\/"},"modified":"2024-04-29T22:52:04","modified_gmt":"2024-04-29T14:52:04","slug":"45605-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45605-2\/","title":{"rendered":""},"content":{"rendered":"<h1>\u306f\u3058\u3081\u306b<\/h1>\n<p>Rust\u306e\u57fa\u672c\u7684\u306a\u6587\u6cd5\u3092\u307e\u3068\u3081\u3066\u307f\u305f\u3002\u7b2c2\u56de\u306e\u7d9a\u304d\u3067\u3059\u3002<br \/>\n\u4eca\u56de\u306f\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc&#8221;\uff3f&#8221;\u306b\u3064\u3044\u3066\u3002<\/p>\n<h3>\u76ee\u7684<\/h3>\n<p>Rust\u306b\u304a\u3051\u308b\u57fa\u672c\u7684\u306a\u69cb\u6587\u306e\u7406\u89e3\u3092\u3059\u308b\u3002<br \/>\n\u305d\u308c\u3089\u3092\u6d3b\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u3002<\/p>\n<h1>Rust\u306e\u57fa\u672c\u69cb\u6587\u30b7\u30ea\u30fc\u30ba<\/h1>\n<p>\u7b2c1\u56de\u21d2Rust\u306e\u57fa\u672c\u69cb\u6587(1)\u3000\u3000URL\uff1ahttps:\/\/qiita.com\/jin237\/items\/b344d3a7e6dfe1056e31<br \/>\n\u7b2c2\u56de\u21d2Rust\u306e\u57fa\u672c\u69cb\u6587(2)\u3000\u3000URL:https:\/\/qiita.com\/jin237\/items\/6910b4f803a35f317213<\/p>\n<h1>\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u306eWarning\u3068\u5b9f\u9a13<\/h1>\n<p>\u7b2c1,2\u56de\u306b\u304a\u3044\u3066\u3001\u4f8b\u306e\u30b3\u30fc\u30c9\u5185\u306b\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u304c\u3064\u3044\u3066\u3044\u308b\u3082\u306e\u3068\u3064\u3044\u3066\u3044\u306a\u3044\u3082\u306e\u306b\u3064\u3044\u3066\u3001\u533a\u5225\u304c\u306a\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u8a18\u8f09\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3092\u5f15\u7528\u3057\u3066\u304f\u308b\u3002(from \u5b9f\u8df5Rust\u5165\u9580\u3000\u8a00\u8a9e\u4ed5\u69d8\u304b\u3089\u958b\u767a\u624b\u6cd5\u307e\u3067 P.226-\u4f8b4)<br \/>\n\u5c11\u3057\u524d\u56de\u304b\u3089\u6539\u7de8<\/p>\n<p>\u307e\u305a\u306f\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u3092\u8003\u3048\u305a\u306b\u66f8\u3044\u3066\u307f\u308b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">\/\/\u4f8b4<\/span>\r\n<span class=\"c\">\/\/main\u95a2\u6570<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">shadowing_example<\/span><span class=\"p\">();<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"c\">\/\/shadowing\u95a2\u6570<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">shadowing_example<\/span><span class=\"p\">(){<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span><span class=\"s\">\"String\"<\/span><span class=\"p\">;<\/span>\r\n\r\n        <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">{<\/span>\r\n            <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">30<\/span><span class=\"p\">;<\/span>\r\n            <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"post-pre\"><code><span class=\"go\">[Done] exited with code=0 in 0.822 seconds\r\n\r\n[Running] cd \"c:\\Users\\[username]\\rust\\project1\\\" &amp;&amp; rustc let_function3.rs &amp;&amp; \"c:\\Users\\[username]\\rust\\project1\\\"let_function3\r\nwarning: unused variable: `x`\r\n<\/span><span class=\"gp\"> --&gt;<\/span> let_function3.rs:6:13\r\n<span class=\"go\">  |\r\n<\/span><span class=\"gp\">6 |         let x = 10;<\/span>\r\n<span class=\"go\">  |             ^ help: consider prefixing with an underscore: `_x`\r\n  |\r\n<\/span><span class=\"gp\">  = note: `#<\/span><span class=\"o\">[<\/span>warn<span class=\"o\">(<\/span>unused_variables<span class=\"o\">)]<\/span><span class=\"sb\">`<\/span> on by default\r\n<span class=\"go\">\r\nwarning: unused variable: `x`\r\n<\/span><span class=\"gp\"> --&gt;<\/span> let_function3.rs:7:13\r\n<span class=\"go\">  |\r\n<\/span><span class=\"gp\">7 |         let x = 20;<\/span>\r\n<span class=\"go\">  |             ^ help: consider prefixing with an underscore: `_x`\r\n\r\nString\r\n30\r\nString\r\n\r\n[Done] exited with code=0 in 0.625 seconds\r\n<\/span><\/code><\/pre>\n<p>\u3068\u306a\u308a\u3001\u5b9f\u884c\u306f\u3055\u308c\u308b\u304c\u3001Warning\u304c\u8d77\u3053\u3063\u3066\u3057\u307e\u3046\u3002\u3088\u304f\u3088\u304f\u898b\u3066\u307f\u308b\u3068<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">let x = 10;<\/span>\r\n<span class=\"go\">    ^ help: consider prefixing with an underscore: `_x\r\n<\/span><\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"gp\">let x = 20;<\/span>\r\n<span class=\"go\">    ^ help: consider prefixing with an underscore: `_x`\r\n<\/span><\/code><\/pre>\n<p>\u306e\u3088\u3046\u306b\u4e8c\u3064\u306e\u304c\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u66f8\u3044\u3066\u3042\u308b\u3002\u306a\u3044\u3088\u3046\u3068\u3057\u3066\u306f\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u3092&#8221;x&#8221;\u306e\u524d\u306b\u3064\u3051\u308b\u3068\u3044\u3046\u5185\u5bb9\u3067\u3042\u308b\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001\u6307\u793a\u306e\u901a\u308a\u306b\u3064\u3051\u3066\u307f\u308b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">\/\/\u4f8b4<\/span>\r\n<span class=\"c\">\/\/main\u95a2\u6570<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">shadowing_example<\/span><span class=\"p\">();<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"c\">\/\/shadowing\u95a2\u6570<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">shadowing_example<\/span><span class=\"p\">(){<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span><span class=\"s\">\"String\"<\/span><span class=\"p\">;<\/span>\r\n\r\n        <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">{<\/span>\r\n            <span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">30<\/span><span class=\"p\">;<\/span>\r\n            <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"nd\">println!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"{}\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">x<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"post-pre\"><code><span class=\"go\">[Running] cd \"c:\\Users\\[username]\\rust\\project1\\\" &amp;&amp; rustc let_function3.rs &amp;&amp; \"c:\\Users\\[username]\\rust\\project1\\\"let_function3\r\nString\r\n30\r\nString\r\n\r\n[Done] exited with code=0 in 3.437 seconds\r\n<\/span><\/code><\/pre>\n<p>\u3068\u306a\u308a\u3001\u6b63\u5e38\u306b\u52d5\u3044\u305f\u3002<\/p>\n<h1>\u306a\u305c\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u306e\u8981\u6c42\u304c\u3042\u308b\u306e\u304b<\/h1>\n<p>\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u304c\u5fc5\u8981\u306a\u500b\u6240\u306b\u3064\u3044\u3066\u3001\u307b\u304b\u306e\u30b3\u30fc\u30c9\u3082\u898b\u306a\u304c\u3089\u8003\u3048\u3066\u307f\u305f\u3002\uff1d\u5171\u901a\u70b9\u306e\u635c\u7d22<\/p>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u4e0a\u3067\u306f\u3001<br \/>\nprintln!(&#8220;&#8221;)\u306a\u3069\u306e\u5909\u6570\u306b\u5bfe\u3059\u308b\u4f7f\u7528\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u3068\u304d\u767a\u751f\u3059\u308b\u3002<br \/>\n\u30b7\u30e3\u30c9\u30a6\u30a4\u30f3\u30b0\u3067\u306e\u5909\u6570\u306e\u4e0a\u66f8\u304d\u3084\u96a0\u3059\u3068\u3044\u3046\u884c\u70ba\u304c\u3042\u308b\u3068\u304d\u306b\u4f7f\u3048\u308b\u3002<br \/>\n\u4f8b\u3048\u3070\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u3068\u3057\u305f\u3068\u304d\u306b&#8221;x&#8221;\u306e\u4e2d\u8eab\u306f10\u304c20\u306b\u3088\u3063\u3066\u30b7\u30e3\u30c9\u30a6\u30a4\u30f3\u30b0\u3055\u308c\u308b\u3002\u3053\u306e\u6642\u306b\u3001\u4e0a\u66f8\u304d\u3055\u308c\u308b\u5074\u306b\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u3092\u4ed8\u3051\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u4f55\u304c\u3069\u3046\u5909\u5316\u3057\u305f\u306e\u304b\u304c\u660e\u78ba\u306b\u306a\u308b\u3002Warning\u304c\u51fa\u308b\u7406\u7531\u306b\u3064\u3044\u3066\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u5074\u3067\u306f\u63a8\u6e2c\u5b9f\u884c\u7d50\u679c\u3068\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u3001\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u4eba\u304c\u3069\u3046\u3044\u3046\u6d41\u308c\u3067\u5909\u5316\u3092\u3055\u305b\u3066\u3044\u308b\u304b\u3092\u8868\u73fe\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u4f7f\u3048\u308b\u3002<br \/>\n\u306a\u306e\u3067\u4e0a\u8a18\u306e\u3082\u306e\u306f<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u3068\u66f8\u304d\u63db\u3048\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u4e00\u756a\u4e0a\u306e\u30b3\u30fc\u30c9(\u4f8b4)\u306b\u623b\u3063\u3066\u307f\u308b\u3002<br \/>\nfn shadowing_example()\u306e\u4e2d\u8eab\u306b\u3064\u3044\u3066<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">\/\/\u8003\u3048\u306a\u3044\u5834\u5408<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span><span class=\"s\">\"String\"<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c\">\/\/10\u21d220\u306b\u3059\u308b\u5834\u5408<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>          <span class=\"c\">\/\/10(\u3055\u308c\u308b\u5074)<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>           <span class=\"c\">\/\/20(\u3059\u308b\u5074)<\/span>\r\n\r\n<span class=\"c\">\/\/20\u21d2\"String\"\u306b\u3059\u308b\u5834\u5408<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>         <span class=\"c\">\/\/20(\u3055\u308c\u308b\u5074)<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"String\"<\/span>     <span class=\"c\">\/\/\"String\"(\u3059\u308b\u5074)<\/span>\r\n\r\n<span class=\"c\">\/\/10\u21d220\u21d2\"String\"\u306b\u9806\u306b\u5909\u66f4\u3057\u3066\u3044\u304f\u5834\u5408<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"mi\">_<\/span><span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">20<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span><span class=\"s\">\"String\"<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u3068\u8003\u3048\u3089\u308c\u308b\u3002<\/p>\n<p>\u3053\u308c\u3067\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc\u306e\u5b58\u5728\u610f\u7fa9\u3001\u307e\u305f\u306f\u4fa1\u5024\u304c\u78ba\u7acb\u3059\u308b\u3002<\/p>\n<h1>\u3055\u3044\u3054\u306b<\/h1>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u304f\u3068\u304d\u306bError\u3068\u7acb\u3061\u5411\u304b\u3046\u3053\u3068\u304c\u591a\u3044\u3002\u8abf\u3079\u3066\u307f\u308b\u306e\u306f\u5927\u4e8b\u3060\u3057\u3001\u3059\u3050\u306b\u3067\u304d\u308b\u304b\u3089\u30ea\u30b5\u30fc\u30c1\u529b\u306f\u975e\u5e38\u306b\u5927\u4e8b\u3060\u304c\u3001\u305d\u306eError\u5185\u5bb9\u3092\u3057\u3063\u304b\u308a\u3068\u307f\u308b\u3053\u3068\u3082\u5927\u4e8b\u3060\u3068\u601d\u3046\u3002\u7279\u306bRust\u306eWarning\u3084Error\u306b\u95a2\u3057\u3066\u306f\u3001\u3068\u3066\u3082\u5206\u304b\u308a\u3084\u3059\u304f\u66f8\u3044\u3066\u3042\u308b\u306e\u3067\u3001\u81ea\u5206\u3067\u76f4\u3057\u3084\u3059\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b Rust\u306e\u57fa\u672c\u7684\u306a\u6587\u6cd5\u3092\u307e\u3068\u3081\u3066\u307f\u305f\u3002\u7b2c2\u56de\u306e\u7d9a\u304d\u3067\u3059\u3002 \u4eca\u56de\u306f\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc&#8221;\uff3f&#038;#8 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45605","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- 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\/45605-2\/\" \/>\n<meta property=\"og:locale\" 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