{"id":45379,"date":"2023-12-18T14:30:21","date_gmt":"2023-01-23T23:32:23","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45379-2\/"},"modified":"2024-05-04T14:09:31","modified_gmt":"2024-05-04T06:09:31","slug":"45379-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45379-2\/","title":{"rendered":""},"content":{"rendered":"<p>Rust \u30b3\u30f3\u30d1\u30a4\u30e9\uff08rustc\uff09\u306e\u632f\u308b\u821e\u3044\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b debug \u30ec\u30d9\u30eb\u306e\u30ed\u30b0\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e\u30ed\u30b0\u304c\u5fc5\u8981\u306b\u306a\u308b\u6a5f\u4f1a\u306f\u307b\u3068\u3093\u3069\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u4eca\u56de\u3001\u81ea\u5206\u304c\u5fc5\u8981\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u305d\u306e\u65b9\u6cd5\u3092\u8a18\u4e8b\u3068\u3057\u3066\u6b8b\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u3061\u306a\u307f\u306b\u5fc5\u8981\u306b\u306a\u3063\u305f\u7406\u7531\u306f\u3001\u578b\u5f37\u5236\u306e\u4e2d\u306e method receiver coercion \u304c\u3001\u81ea\u5206\u304c\u7406\u89e3\u3057\u305f\u901a\u308a\u306e\u9806\u756a\u3067\u884c\u308f\u308c\u3066\u3044\u308b\u306e\u304b\u78ba\u8a8d\u3057\u305f\u304b\u3063\u305f\u304b\u3089\u3067\u3057\u305f\u3002<\/p>\n<h2>\u6e96\u5099\uff1aRust\u30c4\u30fc\u30eb\u30c1\u30a7\u30a4\u30f3\u3092\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u30d3\u30eb\u30c9\u3059\u308b<\/h2>\n<p>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306f\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u306f\u4fbf\u5229\u3067\u3059\u304c\u3001\u4e00\u822c\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u4f7f\u3046\u3053\u3068\u306f\u307e\u305a\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u306e\u305f\u3081\u3001Stable \u7248\u306f\u3082\u3061\u308d\u3093\u3001Nightly \u7248\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u3067\u3082\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u30aa\u30d5\u306b\u3057\u3066\u30d3\u30eb\u30c9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u3092\u542b\u3080 Rust \u30c4\u30fc\u30eb\u30c1\u30a7\u30a4\u30f3\u3092\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u30d3\u30eb\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3068\u3044\u3063\u3066\u3082\u7279\u306b\u96e3\u3057\u3044\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u57fa\u672c\u7684\u306b\u3053\u3061\u3089\u306b\u66f8\u304b\u308c\u3066\u3044\u308b\u624b\u9806\u3067\u30d3\u30eb\u30c9\u3059\u308c\u3070 OK \u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">https:\/\/github.com\/rust-lang\/rust#building-from-source<\/ul>\n<p>\u305f\u3060\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u8a2d\u5b9a\u3067\u306f\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u304c\u30aa\u30d5\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001.\/x.py build \u3092\u5b9f\u884c\u3059\u308b\u524d\u306b\u4ee5\u4e0b\u306e\u30da\u30fc\u30b8\u3092\u53c2\u8003\u306b config.toml \u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3066\u3001debug-assertions \u3068\u3044\u3046\u8a2d\u5b9a\u3092 true \u306b\u3057\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">https:\/\/github.com\/rust-lang\/rust\/blob\/master\/CONTRIBUTING.md#rust<\/ul>\n<p>\u307e\u305f\u3001rustup \u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001sudo .\/x.py install \u306f\u5b9f\u884c\u305b\u305a\u3001\u4ee3\u308f\u308a\u306b rustup toolchain link &#8230; \u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n<h3>Linux x86_64\u3067\u306e\u30d3\u30eb\u30c9\u4f8b<\/h3>\n<p>\u79c1\u306f\u4eca\u56de Arch Linux x86_64 \u3092\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">#<\/span> \u5fc5\u8981\u306a\u30c4\u30fc\u30eb\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u3002\uff08gcc\u3068clang\u306f\u3069\u3061\u3089\u304b\u4e00\u65b9\u3067OK\uff09\r\n<span class=\"gp\">$<\/span> <span class=\"nb\">sudo <\/span>pacman <span class=\"nt\">-S<\/span> gcc clang python2 make cmake curl git\r\n\r\n<span class=\"gp\">#<\/span> Rust\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3059\u308b\r\n<span class=\"gp\">$<\/span> git clone https:\/\/github.com\/rust-lang\/rust.git\r\n<span class=\"gp\">$<\/span> <span class=\"nb\">cd <\/span>rust\r\n\r\n<span class=\"gp\">#<\/span> config.toml\u3092\u7528\u610f\u3059\u308b\r\n<span class=\"gp\">$<\/span> <span class=\"nb\">cp<\/span> <span class=\"nt\">-p<\/span> config.toml<span class=\"o\">{<\/span>.example,<span class=\"o\">}<\/span>\r\n<span class=\"gp\">$<\/span> vi config.toml\r\n<span class=\"gp\">#<\/span> <span class=\"o\">[<\/span>rust]\u30bb\u30af\u30b7\u30e7\u30f3\u306edebug-assertions\u3092true\u306b\u5909\u66f4\u3059\u308b\u3002\r\n\r\n<span class=\"gp\">#<\/span> Rust\u30c4\u30fc\u30eb\u30c1\u30a7\u30a4\u30f3\u3092\u30d3\u30eb\u30c9\u3059\u308b\u3002\r\n<span class=\"gp\">#<\/span> \u521d\u56de\u306fLLVM\u3092\u30d3\u30eb\u30c9\u3059\u308b\u306e\u3067\u6570\u6642\u9593\u304b\u304b\u308b\u3068\u601d\u3063\u3066\u6c17\u9577\u306b\u5f85\u3064\u3002\r\n<span class=\"gp\">$<\/span> .\/x.py build\r\n<\/code><\/pre>\n<p>\u30d3\u30eb\u30c9\u3067\u304d\u305f\u3089 rustup \u304b\u3089\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">#<\/span> \u30c4\u30fc\u30eb\u30c1\u30a7\u30a4\u30f3\u3092local\u3068\u3044\u3046\u540d\u524d\u3067\u767b\u9332\u3059\u308b\u3002\r\n<span class=\"gp\">$<\/span> rustup toolchain <span class=\"nb\">link local<\/span> .\/build\/x86_64-unknown-linux-gnu\/stage2\r\n\r\n<span class=\"gp\">#<\/span> \u8a66\u3057\u306brustc\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u8868\u793a\u3057\u3066\u307f\u308b\u3002\r\n<span class=\"gp\">$<\/span> rustc +local <span class=\"nt\">-V<\/span>\r\n<span class=\"go\">rustc 1.26.0-dev\r\n<\/span><\/code><\/pre>\n<h2>\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n<p>\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f RUST_LOG \u74b0\u5883\u5909\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u3001\u5168\u3066\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> <span class=\"nv\">RUST_LOG<\/span><span class=\"o\">=<\/span>debug cargo +local build\r\n<\/code><\/pre>\n<p>\u305f\u3060\u3053\u308c\u3060\u3068\u51c4\u307e\u3058\u3044\u91cf\u306e\u30ed\u30b0\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002Hello World\u3067120\u4e07\u884c\u307b\u3069\u3067\u3059\u3002\u3067\u3059\u304b\u3089\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ed\u30b0\u3092\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\u304b\u3089\u30d5\u30a1\u30a4\u30eb\u3078\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5bfe\u8c61\u306e\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u6307\u5b9a\u3059\u308b<\/ul>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> <span class=\"nv\">RUST_LOG<\/span><span class=\"o\">=<\/span>rustc_typeck::check::method<span class=\"o\">=<\/span>debug <span class=\"se\">\\<\/span>\r\n  cargo +local build 2&gt; build.log\r\n<\/code><\/pre>\n<h2>\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u5229\u7528\u306e\u5b9f\u4f8b<\/h2>\n<p>\u79c1\u304c\u4eca\u56de\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u3092\u898b\u305f\u304b\u3063\u305f\u7406\u7531\u306f\u3001\u578b\u5f37\u5236\u306e\u4e2d\u306e method receiver coercion \u304c\u81ea\u5206\u306e\u7406\u89e3\u3057\u3066\u3044\u308b\u901a\u308a\u306e\u9806\u756a\u3067\u884c\u308f\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u305f\u304b\u3063\u305f\u304b\u3089\u3067\u3057\u305f\u3002\u4eca\u56de\u8abf\u3079\u305f\u3053\u3068\u3092\u5b9f\u4f8b\u3068\u3057\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>Rust \u306b\u306f\u578b\u5f37\u5236\uff08type coercion\uff09\u3068\u3044\u3046\u6697\u9ed9\u306e\u578b\u5909\u63db\u304c\u3042\u308a\u3001\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u6027\u306b\u5927\u304d\u304f\u8ca2\u732e\u3057\u3066\u3044\u307e\u3059\u3002\u578b\u5f37\u5236\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u304c\u3042\u308a\u3001\u3059\u3067\u306b\u3001\u3053\u3061\u3089\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">type coercion(\u578b\u5f37\u5236)\u306b\u6163\u308c\u89aa\u3057\u3080<\/ul>\n<p>\u79c1\u304c\u4eca\u56de\u78ba\u8a8d\u3057\u305f\u304b\u3063\u305f\u306e\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u30ec\u30b7\u30fc\u30d0\u306e\u578b\u5f37\u5236\u304c\u8d77\u3053\u308b\u6b63\u78ba\u306a\u9806\u756a\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u7247\u306b\u3064\u3044\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">let<\/span> <span class=\"n\">v<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Vec<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">u8<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"nd\">vec!<\/span><span class=\"p\">[<\/span><span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">];<\/span>\r\n\r\n<span class=\"c\">\/\/ \u30e1\u30bd\u30c3\u30c9\u30ec\u30b7\u30fc\u30d0Vec&lt;u8&gt;\u304c\u3001&amp;[u8]\u3078\u578b\u5f37\u5236\u3055\u308c\u308b\u3053\u3068\u3067\u3001<\/span>\r\n<span class=\"c\">\/\/ \u30b9\u30e9\u30a4\u30b9\u306efirst(&amp;self)\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u308f\u308c\u308b\u3002<\/span>\r\n<span class=\"k\">let<\/span> <span class=\"mi\">_<\/span> <span class=\"o\">=<\/span> <span class=\"n\">v<\/span><span class=\"nf\">.first<\/span><span class=\"p\">();<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3082\u3057\u578b\u5f37\u5236\u304c\u306a\u304b\u3063\u305f\u3089\u3053\u3046\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/span>\r\n<span class=\"c\">\/\/ let _ = (&amp;v[..]).first();<\/span>\r\n<\/code><\/pre>\n<p>\u3055\u3066\u3001v.first() \u3067\u8d77\u3053\u308b Vec \u2192 &amp;[u8] \u306e\u578b\u5f37\u5236\u3067\u3059\u304c\u30011\u30b9\u30c6\u30c3\u30d7\u3067\u306f\u5b9f\u73fe\u3067\u304d\u307e\u305b\u3093\u3002\u6700\u4f4e\u3067\u30822\u30b9\u30c6\u30c3\u30d7\u5fc5\u8981\u306a\u306e\u3067\u3059\u304c\u3001\u305d\u308c\u306f\u3069\u3046\u3044\u3046\u9806\u756a\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>Vec \u2192\uff08Deref\uff09\u2192 [u8] \u2192\uff08\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316\uff09\u2192 &amp;[u8]<\/p>\n<p>Vec \u2192\uff08\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316\uff09\u2192 &amp;Vec \u2192\uff08Deref\uff09\u2192 &amp;[u8]<\/p>\n<p>Rust Reference \u306e Method Call Expr \u3092\u8aad\u3080\u3068\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u691c\u7d22\u306e\u969b\u3001\u4ee5\u4e0b\u306e\u9806\u756a\u3067\u578b\u5f37\u5236\u304c\u884c\u308f\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>self\u304c\u30ec\u30b7\u30fc\u30d0\u306e\u578b\uff08T\u578b\uff09\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u305d\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b<\/p>\n<p>T\u578b\u306e\u30c8\u30ec\u30a4\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001\u305d\u308c\u3092\u4f7f\u7528<\/p>\n<p>&amp;T\u578b\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001&amp;T\u3078\u578b\u5f37\u5236\u3057\u3066\u304b\u3089\u4f7f\u7528<\/p>\n<p>&amp;T\u578b\u306e\u30c8\u30ec\u30a4\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001&amp;T\u3078\u578b\u5f37\u5236\u3057\u3066\u304b\u3089\u4f7f\u7528<\/p>\n<p>&amp;mut T\u578b\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001&amp;mut T\u3078\u578b\u5f37\u5236\u3057\u3066\u304b\u3089\u4f7f\u7528<\/p>\n<p>&amp;mut T\u578b\u306e\u30c8\u30ec\u30a4\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306a\u3089\u3001&amp;mut T\u3078\u578b\u5f37\u5236\u3057\u3066\u304b\u3089\u4f7f\u7528<br \/>\n\u4e00\u81f4\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u306a\u3089\u3001Deref\u306b\u3088\u308b\u578b\u5f37\u5236\u304b\u30b5\u30a4\u30ba\u306e\u4e0d\u5b9a\u5316\u3092\u884c\u3044\u30011\u304b\u30896\u3092\u7e70\u308a\u8fd4\u3059<\/p>\n<ul class=\"post-ul\">\u578b\u304c\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u3084\u3001\u9006\u306b\u578b\u304c\u4e00\u81f4\u3059\u308b\u30c8\u30ec\u30a4\u30c8\u30e1\u30bd\u30c3\u30c9\u304c\u8907\u6570\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002<\/ul>\n<p>\u3053\u308c\u306b\u3088\u308b\u3068\u3001\u5148\u307b\u3069\u306e\u4f8b\u306f\u4ee5\u4e0b\u306e\u9806\u756a\u3067\u578b\u5f37\u5236\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u521d\u56de\u306e1\u304b\u30896\u3067\u306f\u8a72\u5f53\u305b\u305a<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>7\u3067Deref\u306b\u3088\u308b\u578b\u5f37\u5236 Vec \u2192 [u8]<\/ol>\n<\/li>\n<\/ol>\n<p>1\u306b\u623b\u308a\u30013\u306e\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316 [u8] \u2192 &amp;[u8] \u3067\u304a\u76ee\u5f53\u306e first() \u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3064\u3051\u308b<\/p>\n<p>\u3064\u307e\u308a\u3001\u3053\u306e\u9806\u756a\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>Vec \u2192\uff08Deref\uff09\u2192 [u8] \u2192\uff08\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316\uff09\u2192 &amp;[u8]<\/p>\n<p>\u666e\u6bb5 Rust \u3092\u4f7f\u3063\u3066\u3044\u308b\u5206\u306b\u306f\u7d30\u304b\u306a\u9806\u756a\u3092\u77e5\u3089\u306a\u304f\u3066\u3082\u4e0d\u81ea\u7531\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u79c1\u306f\u3053\u3053\u4e00\u5e74\u307b\u3069\u5171\u8457\u3067 Rust \u306e\u65e5\u672c\u8a9e\u66f8\u7c4d\u3092\u57f7\u7b46\u3057\u3066\u304a\u308a\u3001\u305d\u3053\u306b\u66f8\u3044\u305f\u3053\u3068\u304c\u6b63\u3057\u3044\u3053\u3068\u3092\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u78ba\u8a8d\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u3067\u304d\u308b\u9650\u308a\u5b9f\u969b\u306b\u52d5\u304b\u3057\u3066\u78ba\u8a8d\u3057\u3066\u304a\u304d\u305f\u3044\u3068\u611f\u3058\u3066\u3044\u307e\u3057\u305f\u3002\u4e0a\u306e\u3053\u3068\u3092\u8abf\u3079\u3066\u304b\u30892\u30f6\u6708\u307b\u3069\u7d4c\u3061\u3001\u5c11\u3057\u6642\u9593\u304c\u3067\u304d\u305f\u306e\u3067\u3001\u672c\u65e5\u3001\u5b9f\u969b\u306b\u78ba\u8a8d\u3057\u3066\u307f\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3055\u3066\u3001\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u306e\u53d6\u5f97\u306b\u5148\u7acb\u3063\u3066\u3001Rust \u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u691c\u7d22\u3057\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u5f53\u305f\u308a\u3092\u3064\u3051\u3066\u304a\u304d\u307e\u3059\u3002\u306a\u304a rg\uff08ripgrep\uff09\u30b3\u30de\u30f3\u30c9\u306f Rust \u3067\u66f8\u304b\u308c\u305f\u9ad8\u901f\u7248\u306e egrep \u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">#<\/span> \u30e1\u30bd\u30c3\u30c9\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316\u306fautorefd\u3068\u547c\u3070\u308c\u308b\u3002\r\n<span class=\"gp\">$<\/span> rg autorefd src\/\r\n<span class=\"go\">src\/librustc_typeck\/check\/method\/probe.rs\r\n881:                self.pick_autorefd_method(step, hir::MutImmutable).or_else(|| {\r\n882:                self.pick_autorefd_method(step, hir::MutMutable)\r\n<\/span><span class=\"gp\">915:    fn pick_autorefd_method(&amp;mut self, step: &amp;CandidateStep&lt;'tcx&gt;<\/span>, mutbl: hir::Mutability<span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u691c\u7d22\u3068\u30ec\u30b7\u30fc\u30d0\u306e\u578b\u5f37\u5236\u304c rustc_typeck::check::method \u306e\u8fba\u308a\u3067\u884c\u308f\u308c\u3066\u3044\u308b\u306e\u3060\u308d\u3046\u3068\u898b\u5f53\u304c\u3064\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u5148\u307b\u3069\u306e\u30b3\u30fc\u30c9\u7247\u3092 main() \u95a2\u6570\u306b\u66f8\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">v<\/span><span class=\"p\">:<\/span> <span class=\"nb\">Vec<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">u8<\/span><span class=\"o\">&gt;<\/span> <span class=\"o\">=<\/span> <span class=\"nd\">vec!<\/span><span class=\"p\">[<\/span><span class=\"mi\">3<\/span><span class=\"p\">,<\/span> <span class=\"mi\">4<\/span><span class=\"p\">,<\/span> <span class=\"mi\">5<\/span><span class=\"p\">];<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"mi\">_<\/span> <span class=\"o\">=<\/span> <span class=\"n\">v<\/span><span class=\"nf\">.first<\/span><span class=\"p\">();<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u4ed8\u304d\u3067\u30d3\u30eb\u30c9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> <span class=\"nv\">RUST_LOG<\/span><span class=\"o\">=<\/span>rustc_typeck::check::method<span class=\"o\">=<\/span>debug <span class=\"se\">\\<\/span>\r\n  cargo +local build 2&gt; build.log\r\n\r\n<span class=\"gp\">$<\/span> <span class=\"nb\">wc<\/span> <span class=\"nt\">-l<\/span> build.log \r\n<span class=\"go\">86 build.log\r\n<\/span><\/code><\/pre>\n<p>\u3053\u308c\u306780\u884c\u5f37\u306e\u30ed\u30b0\u304c\u5f97\u3089\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u30ed\u30b0\u3092\u898b\u306a\u304c\u3089 rg \u306a\u3069\u3067\u7d5e\u308a\u8fbc\u3093\u3067\u3044\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3068\u6d41\u308c\u304c\u308f\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> rg <span class=\"s1\">'probe.*item_name|pick_method|searching|applicable_candidates'<\/span> <span class=\"se\">\\<\/span>\r\n    build.log     \r\n<span class=\"go\">2:DEBUG 2018-03-31T04:23:57Z: rustc_typeck::check::method::probe: probe(self_ty=[_], item_name=into_vec, scope_expr_id=17)\r\n9:DEBUG 2018-03-31T04:23:57Z: rustc_typeck::check::method::probe: pick_method(self_ty=[_])\r\n<\/span><span class=\"c\">...\r\n<\/span><\/code><\/pre>\n<p>\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u306a\u3069\u306f\u90aa\u9b54\u306a\u306e\u3067 cut \u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> rg <span class=\"s1\">'probe.*item_name|pick_method|searching|applicable_candidates'<\/span> <span class=\"se\">\\<\/span>\r\n    build.log <span class=\"se\">\\<\/span>\r\n  | <span class=\"nb\">cut<\/span> <span class=\"nt\">-d<\/span><span class=\"s1\">' '<\/span> <span class=\"nt\">-f<\/span> 4-50\r\n<span class=\"go\">probe(self_ty=[_], item_name=into_vec, scope_expr_id=17)\r\npick_method(self_ty=[_])\r\nsearching inherent candidates\r\napplicable_candidates: [(Candidate { xform_self_ty: [_], xform_ret_ty: None, item: AssociatedItem { def_id: DefId(3\/0:1720 ~ alloc[7ae7]::slice[0]::{{impl}}[0]::into_vec[0]), name: into_vec, kind: Method, vis: Public, defaultness: Final, container: ImplContainer(DefId(3\/0:1664 ~ alloc[7ae7]::slice[0]::{{impl}}[0])), method_has_self_argument: true }, kind: InherentImplCandidate(Slice([_]), []), import_id: None }, Match)]\r\n<\/span><span class=\"gp\">probe(self_ty=std::vec::Vec&lt;u8&gt;<\/span>, <span class=\"nv\">item_name<\/span><span class=\"o\">=<\/span>first, <span class=\"nv\">scope_expr_id<\/span><span class=\"o\">=<\/span>14<span class=\"o\">)<\/span>\r\n<span class=\"gp\">pick_method(self_ty=std::vec::Vec&lt;u8&gt;<\/span><span class=\"o\">)<\/span>\r\n<span class=\"go\">searching inherent candidates\r\napplicable_candidates: []\r\nsearching extension candidates\r\napplicable_candidates: []\r\nsearching unstable candidates\r\napplicable_candidates: []\r\n<\/span><span class=\"gp\">pick_method(self_ty=&amp;std::vec::Vec&lt;u8&gt;<\/span><span class=\"o\">)<\/span>\r\n<span class=\"go\">searching inherent candidates\r\napplicable_candidates: []\r\nsearching extension candidates\r\napplicable_candidates: []\r\nsearching unstable candidates\r\napplicable_candidates: []\r\n<\/span><span class=\"gp\">pick_method(self_ty=&amp;mut std::vec::Vec&lt;u8&gt;<\/span><span class=\"o\">)<\/span>\r\n<span class=\"go\">searching inherent candidates\r\napplicable_candidates: []\r\nsearching extension candidates\r\napplicable_candidates: []\r\nsearching unstable candidates\r\napplicable_candidates: []\r\npick_method(self_ty=[u8])\r\nsearching inherent candidates\r\napplicable_candidates: []\r\nsearching extension candidates\r\napplicable_candidates: []\r\nsearching unstable candidates\r\napplicable_candidates: []\r\npick_method(self_ty=&amp;[u8])\r\nsearching inherent candidates\r\n<\/span><span class=\"gp\">applicable_candidates: [(Candidate { xform_self_ty: &amp;[_], xform_ret_ty: Some(std::option::Option&lt;&amp;_&gt;<\/span><span class=\"o\">)<\/span>, item: AssociatedItem <span class=\"o\">{<\/span> def_id: DefId<span class=\"o\">(<\/span>3\/0:1667 ~ alloc[7ae7]::slice[0]::<span class=\"o\">{{<\/span>impl<span class=\"o\">}}[<\/span>0]::first[0]<span class=\"o\">)<\/span>, name: first, kind: Method, vis: Public, defaultness: Final, container: ImplContainer<span class=\"o\">(<\/span>DefId<span class=\"o\">(<\/span>3\/0:1664 ~ alloc[7ae7]::slice[0]::<span class=\"o\">{{<\/span>impl<span class=\"o\">}}[<\/span>0]<span class=\"o\">))<\/span>, method_has_self_argument: <span class=\"nb\">true<\/span> <span class=\"o\">}<\/span>, kind: InherentImplCandidate<span class=\"o\">(<\/span>Slice<span class=\"o\">([<\/span>_]<span class=\"o\">)<\/span>, <span class=\"o\">[])<\/span>, import_id: None <span class=\"o\">}<\/span>, Match<span class=\"o\">)]<\/span>\r\n<\/code><\/pre>\n<p>probe(self_ty=std::vec::Vec, item_name=first, scope_expr_id=14) \u4ee5\u964d\u304c Vec \u306b\u5bfe\u3059\u308bfirst() \u30e1\u30bd\u30c3\u30c9\u306e\u691c\u7d22\u3067\u3059\u3002<\/p>\n<p>pick_method(self_ty=std::vec::Vec) \u3067 self \u306e\u578b\u3092\u5909\u3048\u306a\u304c\u3089\u3001\u4ee5\u4e0b\u306e\u30b0\u30eb\u30fc\u30d7\u306b\u9069\u5408\u3059\u308b\u5019\u88dc\u304c\u306a\u3044\u304b\u63a2\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>inherent\uff08\u305d\u306e\u578b\u306b\u76f4\u306b impl \u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\uff09<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>extension\uff08\u30c8\u30ec\u30a4\u30c8\u30e1\u30bd\u30c3\u30c9\uff09<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>unstable\uff08\u304a\u305d\u3089\u304f\u3001\u30d5\u30a3\u30fc\u30c1\u30e3\u30fc\u30b2\u30fc\u30c8\u304c\u304b\u304b\u3063\u3066\u3044\u3066\u4f7f\u3048\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u3002\u3082\u3057\u304b\u3057\u3066\u301c\u8868\u793a\u7528\u3068\u601d\u308f\u308c\u308b\u304c\u5b9a\u304b\u3067\u306f\u306a\u3044\uff09<\/ol>\n<p>\u6700\u7d42\u7684\u306b\u3001pick_method(self_ty=&amp;[u8]) \u3067\u3001applicable candidates\uff08\u9069\u5408\u3059\u308b\u5019\u88dc\uff09\u3068\u3057\u3066\u3001\u30b9\u30e9\u30a4\u30b9 &amp;[_] \u306e first \u30e1\u30bd\u30c3\u30c9\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>pick_method \u306b\u6ce8\u76ee\u3057\u3066\u3082\u3046\u4e00\u5ea6 rg\u3002<\/p>\n<pre class=\"post-pre\"><code>$ rg 'probe.*item_name|pick_method' build.log | cut -d' ' -f4-50\r\nprobe(self_ty=[_], item_name=into_vec, scope_expr_id=17)\r\npick_method(self_ty=[_])\r\nprobe(self_ty=std::vec::Vec&lt;u8&gt;, item_name=first, scope_expr_id=14)\r\npick_method(self_ty=std::vec::Vec&lt;u8&gt;)\r\npick_method(self_ty=&amp;std::vec::Vec&lt;u8&gt;)\r\npick_method(self_ty=&amp;mut std::vec::Vec&lt;u8&gt;)\r\npick_method(self_ty=[u8])\r\npick_method(self_ty=&amp;[u8])\r\n<\/code><\/pre>\n<p>&amp;std::vec::Vec \u3067\u306f\u9069\u5408\u5019\u88dc\u306a\u3057\u3067\u3001\u305d\u306e\u5f8c\u306e [u8] \u3082\u9069\u5408\u306a\u3057\u3002\u6700\u7d42\u7684\u306b &amp;[u8] \u3067\u9069\u5408\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0a\u306e\u3053\u3068\u304b\u3089\u578b\u5f37\u5236\u304c\u3053\u306e\u9806\u756a\u3067\u8d77\u3053\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>Vec \u2192\uff08Deref\uff09\u2192 [u8] \u2192\uff08\u30ec\u30b7\u30fc\u30d0\u306e\u53c2\u7167\u5316\uff09\u2192 &amp;[u8]<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Rust \u30b3\u30f3\u30d1\u30a4\u30e9\uff08rustc\uff09\u306e\u632f\u308b\u821e\u3044\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b debug \u30ec\u30d9\u30eb\u306e\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u305d\u306e\u305f\u3081\u306b\u306f Rust \u30c4\u30fc\u30eb\u30c1\u30a7\u30a4\u30f3\u3092\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u30d3\u30eb\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>RUST_LOG=debug \u3067\u306f\u6570\u767e\u4e07\u306e\u30ed\u30b0\u304c\u51fa\u529b\u3055\u308c\u308b\u305f\u3081\u3001\u95c7\u96f2\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3057\u3066\u3082\u6210\u679c\u304c\u5c11\u306a\u3044\u3002\u4ee5\u4e0b\u306e\u6e96\u5099\u3092\u3057\u3066\u304a\u304f\u3068\u826f\u3044<\/p>\n<p>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff08API doc\u3001Rust Reference\u3001The Book\u3001RFC\u306a\u3069\uff09\u3092\u8aad\u3093\u3067\u3001\u632f\u308b\u821e\u3044\u306b\u5bfe\u3059\u308b\u4eee\u8aac\u3092\u7acb\u3066\u308b<br \/>\n\u30b3\u30f3\u30d1\u30a4\u30e9\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u691c\u7d22\u3057\u3066\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u5f53\u305f\u308a\u3092\u3064\u3051\u3066\u304a\u304f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rust \u30b3\u30f3\u30d1\u30a4\u30e9\uff08rustc\uff09\u306e\u632f\u308b\u821e\u3044\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306b debug \u30ec\u30d9\u30eb\u306e\u30ed\u30b0\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45379","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\/45379-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Rust 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