{"id":26783,"date":"2025-12-07T03:05:42","date_gmt":"2025-12-07T03:05:42","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=26783"},"modified":"2025-12-07T03:05:42","modified_gmt":"2025-12-07T03:05:42","slug":"ergo-go%e3%81%ae%e3%82%a8%e3%83%a9%e3%83%bc%e3%83%a9%e3%82%a4%e3%83%96%e3%83%a9%e3%83%aa%e3%82%92%e8%87%aa%e4%bd%9c%e3%81%97%e3%81%a61%e5%b9%b4%e9%96%93%e5%88%a9%e7%94%a8%e3%81%97%e3%81%a6%e3%81%bf","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/26783\/","title":{"rendered":"ergo &#8211; Go\u306e\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u81ea\u4f5c\u3057\u30661\u5e74\u9593\u5229\u7528\u3057\u3066\u307f\u305f\u632f\u308a\u8fd4\u308a &#8211; newmo \u6280\u8853\u30d6\u30ed\u30b0"},"content":{"rendered":"\n<\/p>\n<div>\n<h2 id=\"\u306f\u3058\u3081\u306b\">\u306f\u3058\u3081\u306b<\/h2>\n<h3 id=\"Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\">Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406<\/h3>\n<blockquote>\n<p>Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306b\u4f55\u304b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n<\/blockquote>\n<p>\u3053\u306e\u8cea\u554f\u306fGo 1.0\u306e\u30ea\u30ea\u30fc\u30b9\u304b\u308910\u5e74\u4ee5\u4e0a\u7d4c\u3064\u4eca\u3067\u3082\u3001\u65e5\u672c\u306eGo\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u3067\u3088\u304f\u3055\u308c\u308b\u8cea\u554f\u3067\u3059\u3002\u7b46\u8005\uff08<a target=\"_blank\" href=\"https:\/\/x.com\/tenntenn\">tenntenn<\/a>\uff09\u3082\u3088\u304f\u4ed6\u793e\u306e\u65b9\u304b\u3089\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/github.com\/pkg\/errors\">pkg\/errors<\/a>\u3084<a target=\"_blank\" href=\"http:\/\/golang.org\/x\/xerrors\">golang.org\/x\/xerrors<\/a>\u304c\u30c7\u30d5\u30a1\u30af\u30c8\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u3060\u3063\u305f\u9803\u3068\u6bd4\u3079\u3001\u8fd1\u5e74\uff082025\u5e74\uff09\u306f\u3042\u307e\u308a\u30c7\u30d5\u30a1\u30af\u30c8\u30b9\u30bf\u30f3\u30c0\u30fc\u30c9\u3068\u547c\u3079\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u7121\u3044\u306e\u304c\u73fe\u72b6\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u8a00\u8a9e\u4ed5\u69d8\u3084<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/errors\">errors<\/a>\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3064\u3044\u3066\u3082\u5f90\u3005\u306b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002Go 1.13\u3067\u30a8\u30e9\u30fc\u306e\u30e9\u30c3\u30d7\u3084<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/errors#Is\">errors.Is<\/a>\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/errors#As\">errors.As<\/a>\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3001pkg\/errors\u304c\u4f5c\u3063\u305f\u30a8\u30e9\u30fc\u3092\u30e9\u30c3\u30d7\u3059\u308b\u6587\u5316\u304c\u6a19\u6e96\u306b\u3082\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u540c\u69d8\u306bGo 1.20\u3067<a target=\"_blank\" href=\"https:\/\/go.dev\/doc\/go1.20#errors\">errors.Join<\/a>\u304c\u5165\u308a\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/hashicorp\/go-multierror\">hashicorp\/go-multierror<\/a> \u3084 <a target=\"_blank\" href=\"http:\/\/go.uber.org\/multierr\">go.uber.org\/multierr<\/a> \u304c\u5e83\u3081\u305f\u300c\u8907\u6570\u306e\u30a8\u30e9\u30fc\u3092\u307e\u3068\u3081\u308b\u300d\u6587\u5316\u3082\u6a19\u6e96\u306b\u53d6\u308a\u5165\u308c\u3089\u308c\u307e\u3057\u305f\u3002Go1.26\u3067\u306f<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/errors@master#AsType\">AsType\u95a2\u6570<\/a>\u304c\u5c0e\u5165\u3055\u308c\u308b\u4e88\u5b9a\u3067\u66f4\u306b\u5229\u4fbf\u6027\u304c\u5897\u3059\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001Go\u516c\u5f0f\u30d6\u30ed\u30b0\u306e<a target=\"_blank\" href=\"https:\/\/go.dev\/blog\/error-syntax\">On | No syntactic support for error handling<\/a>\u3067\u306f\u3001\u3053\u308c\u307e\u3067\u306eGo\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u6b74\u53f2\u3092\u632f\u308a\u8fd4\u308b\u3068\u3068\u3082\u306b\u3001\u4eca\u5f8c\u306f\u57fa\u672c\u7684\u306b\u306f\u8a00\u8a9e\u4ed5\u69d8\u306e\u5927\u304d\u306a\u5909\u66f4\u306b\u3088\u3063\u3066\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u6539\u5584\u3055\u308c\u308b\u3053\u3068\u306f\u7121\u3044\u3068\u3044\u3046\u65b9\u91dd\u304c\u767a\u8868\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001Go1.13\u306e\u30ea\u30ea\u30fc\u30b9\u6642\u306b\u30b3\u30fc\u30c9\u304c<a target=\"_blank\" href=\"https:\/\/go.dev\/cl\/176997\">revert\u3055\u308c\u305f<\/a>\u305f\u3081\u3001\u4eca\u306e\u6a19\u6e96\u306e<code>errors<\/code>\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u306f\u30a8\u30e9\u30fc\u306b\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u80cc\u666f\u304b\u3089\u5192\u982d\u306e\u8cea\u554f\u304c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u591a\u304f\u306e\u4f01\u696d\u3067\u306f\u793e\u5185\u9650\u5b9a\u306e\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u81ea\u4f5c\u3059\u308b\u3053\u3068\u304c\u591a\u304f\u306a\u3063\u305f\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<h3 id=\"ergo\u306e\u958b\u767a\u3068\u516c\u958b\">ergo\u306e\u958b\u767a\u3068\u516c\u958b<\/h3>\n<p>newmo\u306f\u5275\u696d\u5f53\u521d\u306f\u30a8\u30e9\u30fc\u51e6\u7406\u306f\u6a19\u6e96\u306e<code>errors<\/code>\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3063\u3066\u958b\u767a\u3092\u884c\u3063\u3066\u3044\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u6a5f\u80fd\u3082\u5897\u3048\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3082\u81a8\u3089\u3093\u3067\u3044\u3063\u305f\u3053\u3068\u3082\u3042\u308a\u3001\u30b3\u30f3\u30d1\u30af\u30c8\u3067\u6271\u3044\u3084\u3059\u3044\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u6c42\u3081\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>newmo\u793e\u5185\u3067\u306f\u3001ergo\u3068\u3044\u3046\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u958b\u767a\u3057\u3066\u304a\u308a\u3001\u6628\u5e74\uff082024\u5e74\uff09\u306e12\u6708\u3054\u308d\u304b\u3089\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u308d\u305d\u308d1\u5e74\u304c\u7d4c\u3064\u3053\u308d\u306a\u306e\u3067\u3001ergo\u3092OSS\u3068\u3057\u3066\u516c\u958b\u3057\u3001\u7279\u5fb4\u3068\u904b\u7528\u3057\u3066\u307f\u3066\u8ab2\u984c\u306b\u611f\u3058\u3066\u3044\u308b\u70b9\u3092\u672c\u8a18\u4e8b\u306b\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgithub.com%2Fnewmo-oss%2Fergo\" title=\"GitHub - newmo-oss\/ergo: A structured error handling library for Go with attributes, error codes, and stack traces\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/github.com\/newmo-oss\/ergo\">github.com<\/a><\/cite><\/p>\n<h2 id=\"ergo\u306e\u7279\u5fb4\">ergo\u306e\u7279\u5fb4<\/h2>\n<h3 id=\"\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\">\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9<\/h3>\n<p>ergo\u3067\u306f\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#New\">New\u95a2\u6570<\/a>\u3084<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#Wrap\">Wrap\u95a2\u6570<\/a>\u3092\u7528\u3044\u3066\u30a8\u30e9\u30fc\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002\u4ed8\u4e0e\u3055\u308c\u308b\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u3001\u3059\u3067\u306bOSS\u3068\u3057\u3066\u516c\u958b\u3057\u3066\u3044\u308b<a target=\"_blank\" href=\"https:\/\/github.com\/newmo-oss\/go-caller\">newmo-oss\/go-caller<\/a>\u3092\u7528\u3044\u3066\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>ergo\u306b\u304a\u3044\u3066\u3082\u30a8\u30e9\u30fc\u3092\u30e9\u30c3\u30d7\u3057\u3066\u3044\u304d\u307e\u3059\u304c\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306e\u4ed8\u4e0e\u306f1\u5ea6\u3060\u3051\u306b\u9650\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u30eb\u30fc\u30c8\u306b\u306a\u308b\u30a8\u30e9\u30fc\u306b\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u308c\u3070\u5341\u5206\u3060\u304b\u3089\u3067\u3059\u3002\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u3088\u3063\u3066\u4f5c\u6210\u3055\u308c\u305f\u30a8\u30e9\u30fc\u306b\u306f\u3001<code>Wrap<\/code>\u95a2\u6570\u3067\u30e9\u30c3\u30d7\u3057\u305f\u969b\u306b\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ed8\u4e0e\u3057\u305f\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#StackTraceOf\">StackTraceOf\u95a2\u6570<\/a>\u3067\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002newmo-oss\/go-caller\u30d1\u30c3\u30b1\u30fc\u30b8\u306e<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/go-caller#StackTrace\">StackTrace\u578b<\/a>\u3092\u8fd4\u3059\u305f\u3081\u3001\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u884c\u756a\u53f7\u3092\u7c21\u5358\u306b\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">func<\/span> f() <span class=\"synType\">error<\/span> {\n    err := ergo.New(<span class=\"synConstant\">\"error\"<\/span>)\n    <span class=\"synStatement\">return<\/span> err\n}\n\n<span class=\"synStatement\">func<\/span> g() {\n    err := f()\n    st := ergo.StackTraceOf(err)\n    <span class=\"synStatement\">for<\/span> _, frame := <span class=\"synStatement\">range<\/span> st {\n        fmt.Printf(<span class=\"synConstant\">\"%s\/%s:%d<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, frame.PkgPath(), frame.File(), frame.Line())\n    }\n}\n<\/pre>\n<p>ergo\u3092\u4f7f\u3063\u305f\u958b\u767a\u3067\u306f\u3001\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\uff08\u5f8c\u8ff0\uff09\u3092\u4e2d\u5fc3\u306b\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u884c\u3046\u305f\u3081\u3001\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3057\u305f\u30a8\u30e9\u30fc\u5909\u6570\u3092\u7528\u3044\u308b\u6a5f\u4f1a\u306f\u591a\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\u3067New\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3068\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u307e\u3059\u3002\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u4e00\u5ea6\u4ed8\u4e0e\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u5f8c\u306e\u95a2\u6570\u3067\u3044\u304f\u3089\u30e9\u30c3\u30d7\u3057\u3066\u3082\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u4ed8\u4e0e\u3055\u308c\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3055\u308c\u305f\u969b\u306e\u3082\u306e\u304c\u4ed8\u4e0e\u3055\u308c\u308b\u305f\u3081\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3068\u3057\u3066\u5f79\u306b\u7acb\u3061\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001ergo\u3067\u306f\u3001\u305d\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u3092\u4f5c\u6210\u3059\u308b\u5834\u5408\u306f\u3001<code>New<\/code>\u95a2\u6570\u306e\u4ee3\u308f\u308a\u306b<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#NewSentinel\">NewSentinel\u95a2\u6570<\/a>\u3092\u7528\u3044\u307e\u3059\u3002\u30bb\u30f3\u30c1\u30cd\u30eb\u30a8\u30e9\u30fc\u3068\u3044\u3046\u540d\u79f0\u306f\u3001Dave Cheney\u6c0f\u306e<a target=\"_blank\" href=\"https:\/\/dave.cheney.net\/2016\/04\/27\/dont-just-check-errors-handle-them-gracefully#sentinel%20errors\">\u8a18\u4e8b<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066\u3044\u307e\u3059\u3002NewSentinel\u95a2\u6570\u306f\u3001[<br \/>\n\u5b9f\u969b\u306b\u306f<code>errors.New<\/code>\u95a2\u6570\u306e\u30e9\u30c3\u30d1\u30fc\u95a2\u6570\u306b\u3059\u304e\u307e\u305b\u3093\u304c\u3001\u5f8c\u8ff0\u3059\u308b\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306b\u3088\u3063\u3066\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">var<\/span> ErrSomething1 = ergo.New(<span class=\"synConstant\">\"error something\"<\/span>)\n\n\n<span class=\"synStatement\">var<\/span> ErrSomething2 = ergo.NewSentinel(<span class=\"synConstant\">\"error something\"<\/span>)\n<\/pre>\n<h3 id=\"\u5c5e\u6027\u306e\u8ffd\u52a0\">\u5c5e\u6027\u306e\u8ffd\u52a0<\/h3>\n<p>ergo\u3068\u3044\u3046\u540d\u79f0\u306f\u3001error + go \u306e\u8a9e\u611f\u306b\u52a0\u3048\u3001\u30e9\u30c6\u30f3\u8a9e\u3067\u300c\u305d\u308c\u3086\u3048\u306b\uff08ergo\uff09\u300d\u3092\u610f\u5473\u3059\u308b\u8a9e\u306b\u7531\u6765\u3057\u307e\u3059\u3002ergo\u3092\u5229\u7528\u3057\u305f\u30a8\u30e9\u30fc\u51e6\u7406\u3067\u306f\u3001\u300c\u305d\u308c\u3086\u3048\u306b\u30a8\u30e9\u30fc\u306b\u306a\u3063\u305f\u300d\u3068\u3044\u3046\u5f62\u3067\u3001\u539f\u56e0\u3084\u305d\u306e\u6642\u306e\u72b6\u614b\u3092\u5f8c\u304b\u3089\u7279\u5b9a\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u56f3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u306f\u3001<code>fmt.Errorf<\/code>\u95a2\u6570\u3067\u3001\u6587\u5b57\u5217\u3068\u3057\u3066\u30a8\u30e9\u30fc\u306b\u60c5\u5831\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u60c5\u5831\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u305d\u306e\u5f8c\u306e\u51e6\u7406\u3067\u500b\u5225\u306b\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>ergo\u3067\u306f\u3001\u6a19\u6e96\u306e<code>log\/slog<\/code>\u30d1\u30c3\u30b1\u30fc\u30b8\u304c\u63d0\u4f9b\u3057\u3066\u3044\u308bAttr\u578b\u3092\u3001\u30a8\u30e9\u30fc\u306e\u4f5c\u6210\u6642\u304a\u3088\u3073\u30e9\u30c3\u30d7\u6642\u306b\u4ed8\u4e0e\u3067\u304d\u307e\u3059\u3002\u4ed8\u4e0e\u3055\u308c\u305f\u5c5e\u6027\u306f\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#AttrsAll\">AttrsAll<\/a>\u95a2\u6570\u3067<code>slog.Attr<\/code>\u306e\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u306fGo1.23\u3067\u5c0e\u5165\u3055\u308c\u305f\u6a5f\u80fd\u3067\u3001\u4efb\u610f\u306e\u578b\u306e\u5024\u3092\u30b7\u30fc\u30b1\u30f3\u30b7\u30e3\u30eb\u306b\u4e26\u3079\u305f\u30c7\u30fc\u30bf\u578b\u3067for range\u6587\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u884c\u3048\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30a4\u30c6\u30ec\u30fc\u30bf\u3092\u5f97\u308b\u3053\u3068\u3067\u30a8\u30e9\u30fc\u306b\u4ed8\u4e0e\u3055\u308c\u305f<code>slog.Attr<\/code>\u578b\u306e\u5024\u3092<code>for range<\/code>\u6587\u3092\u4f7f\u3063\u3066\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u30a4\u30c6\u30ec\u30fc\u30bf\u3067\u3042\u308b\u305f\u3081\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u884c\u3044\u306a\u304c\u3089\u5024\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\uff08\u9078\u5225\uff09\u3092\u884c\u3046\u306e\u3082\u5bb9\u6613\u3067\u3001newmo\u3067\u306f\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u30d5\u30a3\u30eb\u30bf\u30fc\u95a2\u6570\u3092\u793e\u5185\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u3057\u3066\u7528\u610f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\nerr := ergo.New(<span class=\"synConstant\">\"error\"<\/span>, slog.String(<span class=\"synConstant\">\"ride_id\"<\/span>, rideID.String()))\nerr = ergo.Wrap(err, <span class=\"synConstant\">\"wrapped\"<\/span>, slog.String(<span class=\"synConstant\">\"vehicle_id\"<\/span>, vehicleID.String()))\n<\/pre>\n<p>ergo\u306e\u5c5e\u6027\u306f\u5358\u306b\u60c5\u5831\u3092\u4ed8\u4e0e\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30a8\u30e9\u30fc\u304c\u30e9\u30c3\u30d7\u3055\u308c\u308b\u904e\u7a0b\u3067\u4f1d\u64ad\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001newmo\u3067\u306f\u4e0a\u4f4d\u30ec\u30a4\u30e4\u30fc\u306b\u3042\u304c\u3063\u3066\u3044\u304f\u5ea6\u306b\u5c5e\u6027\u304c\u4ed8\u4e0e\u3055\u308c\u308b\u3088\u3046\u306b\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">func<\/span> getVehicle(ctx context.Context, vehicleID uuid.UUID) (*Vehicle, <span class=\"synType\">error<\/span>) {\n    vehicle, err := db.FindVehicle(ctx, vehicleID)\n    <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n        <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, ergo.Wrap(err, <span class=\"synConstant\">\"failed to get vehicle\"<\/span>,\n            slog.String(<span class=\"synConstant\">\"vehicle_id\"<\/span>, vehicleID.String()))\n    }\n    <span class=\"synStatement\">return<\/span> vehicle, <span class=\"synStatement\">nil<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> dispatch(ctx context.Context, rideID, vehicleID uuid.UUID) <span class=\"synType\">error<\/span> {\n    vehicle, err := getVehicle(ctx, vehicleID)\n    <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n        \n        <span class=\"synStatement\">return<\/span> ergo.Wrap(err, <span class=\"synConstant\">\"failed to dispatch\"<\/span>,\n            slog.String(<span class=\"synConstant\">\"ride_id\"<\/span>, rideID.String()))\n    }\n    \n}\n<\/pre>\n<p>\u305d\u3057\u3066\u3001\u30ed\u30b0\u51fa\u529b\u6642\u306b<code>ergo.AttrsAll<\/code>\u95a2\u6570\u3067\u30a8\u30e9\u30fc\u30c1\u30a7\u30fc\u30f3\u5168\u4f53\u304b\u3089\u5c5e\u6027\u3092\u53ce\u96c6\u3057\u3001<code>newmo.attrs<\/code>\u3068\u3044\u3046\u30b0\u30eb\u30fc\u30d7\u306b\u307e\u3068\u3081\u3066\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002\u3082\u3057\u30ed\u30b0\u306b\u51fa\u3057\u305f\u304f\u306a\u3044\u5c5e\u6027\u304c\u3042\u308c\u3070\u3001\u3053\u306e\u3068\u304d\u306b\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u304b\u3051\u3066\u9664\u5916\u3057\u3066\u3082\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">func<\/span> PreprocessAttrs(ctx context.Context, err <span class=\"synType\">error<\/span>, attrs []slog.Attr) []slog.Attr {\n    \n    newmoAttrs := slices.Collect(ergo.AttrsAll(err))\n\n    \n\n    \n    <span class=\"synStatement\">if<\/span> <span class=\"synStatement\">len<\/span>(newmoAttrs) != <span class=\"synConstant\">0<\/span> {\n        attrs = <span class=\"synStatement\">append<\/span>(attrs, slog.Group(<span class=\"synConstant\">\"newmo.attrs\"<\/span>, newmoAttrs...))\n    }\n    <span class=\"synStatement\">return<\/span> attrs\n}\n<\/pre>\n<p>gRPC\u306einterceptor\u3067\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308b\u3068\u3001\u30ed\u30ac\u30fc\u306b\u30a8\u30e9\u30fc\u304c\u6e21\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30a8\u30e9\u30fc\u306f\u4f1d\u642c\u3055\u308c\u3066\u3044\u304f\u4e2d\u3067\u5c5e\u6027\u304c\u4ed8\u4e0e\u3055\u308c\u304a\u308a\u3001\u3053\u308c\u3089\u304c\u524d\u8ff0\u306e\u3088\u3046\u306b\u307e\u3068\u3081\u3089\u308c\u3066\u30ed\u30b0\u306b\u4ed8\u4e0e\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">func<\/span> NewLogger(logger log.Logger) grpc.UnaryServerInterceptor {\n    <span class=\"synStatement\">return<\/span> <span class=\"synType\">func<\/span>(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, <span class=\"synType\">error<\/span>) {\n        \n\n        resp, err := handler(ctx, req)\n        <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n            \n\n            \n            logger.Error(ctx, <span class=\"synConstant\">\"grpc request failed\"<\/span>, err)\n        }\n        <span class=\"synStatement\">return<\/span> resp, err\n    }\n}\n<\/pre>\n<p>\u51fa\u529b\u3055\u308c\u308b\u30ed\u30b0\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"code lang-json\" data-lang=\"json\" data-unlink=\"\"><span class=\"synSpecial\">{<\/span>\n  \"<span class=\"synStatement\">level<\/span>\": \"<span class=\"synConstant\">ERROR<\/span>\",\n  \"<span class=\"synStatement\">msg<\/span>\": \"<span class=\"synConstant\">grpc request failed<\/span>\",\n  \"<span class=\"synStatement\">error<\/span>\": <span class=\"synSpecial\">{<\/span>\n    \"<span class=\"synStatement\">message<\/span>\": \"<span class=\"synConstant\">failed to dispatch: failed to get vehicle: record not found<\/span>\",\n    \"<span class=\"synStatement\">stack<\/span>\": \"<span class=\"synConstant\">...(\u7701\u7565)...<\/span>\"\n  <span class=\"synSpecial\">}<\/span>,\n  \"<span class=\"synStatement\">newmo.attrs<\/span>\": <span class=\"synSpecial\">{<\/span>\n    \"<span class=\"synStatement\">ride_id<\/span>\": \"<span class=\"synConstant\">...<\/span>\",\n    \"<span class=\"synStatement\">vehicle_id<\/span>\": \"<span class=\"synConstant\">...<\/span>\"\n  <span class=\"synSpecial\">}<\/span>\n<span class=\"synSpecial\">}<\/span>\n<\/pre>\n<p><code>getVehicle<\/code>\u3067\u4ed8\u4e0e\u3057\u305f<code>vehicle_id<\/code>\u3068\u3001<code>dispatch<\/code>\u3067\u4ed8\u4e0e\u3057\u305f<code>ride_id<\/code>\u304c<code>newmo.attrs<\/code>\u306b\u96c6\u7d04\u3055\u308c\u3066\u3044\u307e\u3059\u3002Datadog\u3067<code>@newmo.attrs.vehicle_id:<value\/><\/code>\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><code>fmt.Errorf<\/code>\u3067<code>\"vehicle_id=%s\"<\/code>\u306e\u3088\u3046\u306b\u6587\u5b57\u5217\u3068\u3057\u3066\u57cb\u3081\u8fbc\u3093\u3067\u3057\u307e\u3046\u3068\u3001\u3053\u306e\u3088\u3046\u306a\u69cb\u9020\u5316\u3055\u308c\u305f\u691c\u7d22\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h3 id=\"\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\">\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9<\/h3>\n<p>ergo\u306b\u306f\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u767a\u884c\u3057\u3001\u30a8\u30e9\u30fc\u306b\u4ed8\u4e0e\u3059\u308b\u6a5f\u80fd\u3082\u3042\u308a\u307e\u3059\u3002\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306f\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#Code\">ergo.Code\u578b<\/a>\u3067\u8868\u73fe\u3055\u308c\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#NewCode\">ergo.NewCode\u95a2\u6570<\/a>\u3067\u30ad\u30fc\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6307\u5b9a\u3057\u3066\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3055\u308c\u308b\u3053\u3068\u3092\u671f\u5f85\u3057\u3066\u304a\u308a\u3001\u5ba3\u8a00\u6642\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u3067\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u3084\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u5185\u90e8\u306b\u4fdd\u6301\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u8907\u6570\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u307e\u305f\u304c\u3063\u3066\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u5ba3\u8a00\u3059\u308b\u5834\u5408\u306b\u304a\u3044\u3066\u3082\u30ad\u30fc\u306b\u4f59\u8a08\u306a\u63a5\u982d\u8a9e\u3092\u3064\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002Go\u306e\u30b3\u30fc\u30c9\u4e0a\u3067\u306f\u5024\u3067\u533a\u5225\u3067\u304d\u3001\u6587\u5b57\u5217\u3068\u3057\u3066\u30ed\u30b0\u306a\u3069\u306b\u51fa\u529b\u3057\u305f\u5834\u5408\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u306f\u81ea\u52d5\u3067\u4ed8\u4e0e\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u65e2\u5b58\u306e\u30a8\u30e9\u30fc\u306b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306e\u4ed8\u4e0e\u3059\u308b\u5834\u5408\u306f<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#WithCode\">ergo.WithCode\u95a2\u6570<\/a>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30a8\u30e9\u30fc\u304b\u3089\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#CodeOf\">ergo.CodeOf\u95a2\u6570<\/a>\u3092\u7528\u3044\u307e\u3059\u3002ergo.Code\u578b\u306f\u305d\u306e\u307e\u307e\u6bd4\u8f03\u304c\u53ef\u80fd\u306a\u305f\u3081\u3001\u30a8\u30e9\u30fc\u304b\u3089\u53d6\u5f97\u3057\u305f\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u3068\u3057\u3066\u5ba3\u8a00\u3057\u305f\u3082\u306e\u3068==\u3084!=\u306e\u6bd4\u8f03\u6f14\u7b97\u5b50\u3092\u7528\u3044\u3066\u6bd4\u8f03\u304c\u3067\u304d\u307e\u3059\u3002\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u30bc\u30ed\u5024\u3067\u8868\u3055\u308c\u3001(<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo#Code.IsZero\">ergo.Code).IsZero\u30e1\u30bd\u30c3\u30c9<\/a>\u304c<code>true<\/code>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>newmo\u3067\u306f\u3001erogo\u3092\u5c0e\u5165\u3059\u308b\u4ee5\u524d\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u30c9\u30e1\u30a4\u30f3\u5c64\u3067\u30bb\u30f3\u30c1\u30cd\u30eb\u30a8\u30e9\u30fc\u3092\u5b9a\u7fa9\u3057\u3001\u30cf\u30f3\u30c9\u30e9\u5c64\u3067<code>errors.Is()<\/code>\u3092\u4f7f\u3063\u3066\u5206\u5c90\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">var<\/span> (\n    ErrVehicleNotFound  = errors.New(<span class=\"synConstant\">\"vehicle not found\"<\/span>)\n    ErrDriverNotFound   = errors.New(<span class=\"synConstant\">\"driver not found\"<\/span>)\n    ErrInvalidVehicleID = errors.New(<span class=\"synConstant\">\"invalid vehicle id\"<\/span>)\n    ErrInvalidDriverID  = errors.New(<span class=\"synConstant\">\"invalid driver id\"<\/span>)\n)\n\n\n<span class=\"synStatement\">func<\/span> (s *server) GetVehicle(ctx context.Context, req *pb.GetVehicleRequest) (*pb.GetVehicleResponse, <span class=\"synType\">error<\/span>) {\n    vehicle, err := s.service.GetVehicle(ctx, req.VehicleId)\n    <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n        <span class=\"synStatement\">if<\/span> errors.Is(err, ErrVehicleNotFound) {\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewNotFound(err)\n        }\n        <span class=\"synStatement\">if<\/span> errors.Is(err, ErrDriverNotFound) {\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewNotFound(err)\n        }\n        <span class=\"synStatement\">if<\/span> errors.Is(err, ErrInvalidVehicleID) {\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewInvalidArgument(err)\n        }\n        <span class=\"synStatement\">if<\/span> errors.Is(err, ErrInvalidDriverID) {\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewInvalidArgument(err)\n        }\n        <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewInternal(err)\n    }\n    <span class=\"synStatement\">return<\/span> &amp;pb.GetVehicleResponse{Vehicle: vehicle}, <span class=\"synStatement\">nil<\/span>\n}\n<\/pre>\n<p>\u3053\u308c\u3092ergo\u306e\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u6b21\u306e\u3088\u3046\u306b\u66f8\u304d\u76f4\u3059\u3068<code>switch<\/code>\u6587\u3067\u7c21\u6f54\u306b\u5206\u5c90\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">var<\/span> (\n    ErrCodeVehicleNotFound  = ergo.NewCode(<span class=\"synConstant\">\"VehicleNotFound\"<\/span>, <span class=\"synConstant\">\"vehicle not found\"<\/span>)\n    ErrCodeDriverNotFound   = ergo.NewCode(<span class=\"synConstant\">\"DriverNotFound\"<\/span>, <span class=\"synConstant\">\"driver not found\"<\/span>)\n    ErrCodeInvalidVehicleID = ergo.NewCode(<span class=\"synConstant\">\"InvalidVehicleID\"<\/span>, <span class=\"synConstant\">\"invalid vehicle id\"<\/span>)\n    ErrCodeInvalidDriverID  = ergo.NewCode(<span class=\"synConstant\">\"InvalidDriverID\"<\/span>, <span class=\"synConstant\">\"invalid driver id\"<\/span>)\n)\n\n\n<span class=\"synStatement\">func<\/span> (s *server) GetVehicle(ctx context.Context, req *pb.GetVehicleRequest) (*pb.GetVehicleResponse, <span class=\"synType\">error<\/span>) {\n    vehicle, err := s.service.GetVehicle(ctx, req.VehicleId)\n    <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n        <span class=\"synStatement\">switch<\/span> ergo.CodeOf(err) {\n        <span class=\"synStatement\">case<\/span> ErrCodeVehicleNotFound, ErrCodeDriverNotFound:\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewNotFound(err)\n        <span class=\"synStatement\">case<\/span> ErrCodeInvalidVehicleID, ErrCodeInvalidDriverID:\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewInvalidArgument(err)\n        }\n        <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>, libgrpc.NewInternal(err)\n    }\n    <span class=\"synStatement\">return<\/span> &amp;pb.GetVehicleResponse{Vehicle: vehicle}, <span class=\"synStatement\">nil<\/span>\n}\n<\/pre>\n<p>\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u304c\u5897\u3048\u3066\u3082<code>switch<\/code>\u6587\u3067\u898b\u901a\u3057\u3088\u304f\u66f8\u3051\u3001\u8907\u6570\u306e\u30b3\u30fc\u30c9\u3092\u540c\u3058case\u3067\u307e\u3068\u3081\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u5ba3\u8a00\u3057\u305f\u30d1\u30c3\u30b1\u30fc\u30b8\u540d\u3068\u30b3\u30fc\u30c9\u540d\u304c\u30ed\u30b0\u306e<code>error.kind<\/code>\u306b\u51fa\u529b\u3055\u308c\u308b\u305f\u3081\u3001Datadog\u3067\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3054\u3068\u306b\u691c\u7d22\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id=\"\u904b\u7528\u30921\u5e74\u9593\u3057\u3066\u307f\u3066\">\u904b\u7528\u30921\u5e74\u9593\u3057\u3066\u307f\u3066<\/h2>\n<h3 id=\"\u65e2\u5b58\u30b3\u30fc\u30c9\u306e\u79fb\u884c\">\u65e2\u5b58\u30b3\u30fc\u30c9\u306e\u79fb\u884c<\/h3>\n<p>ergo\u3092\u5229\u7528\u3059\u308b\u524d\u306f\u3001\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u305f\u305f\u3081\u65e2\u5b58\u306e\u30b3\u30fc\u30c9\u306e\u591a\u304f\u3092\u4fee\u6b63\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002newmo\u3067\u306f\u30e2\u30b8\u30e5\u30e9\u30e2\u30ce\u30ea\u30b9\u3092\u63a1\u7528\u3057\u3066\u304a\u308a\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\uff08newmo\u3067\u306f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u547c\u3093\u3067\u3044\u307e\u3059\uff09\u3054\u3068\u306bergo\u306b\u79fb\u884c\u3057\u3066\u3044\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305a\u306f\u8a66\u3057\u306b1\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304b\u3089\u79fb\u884c\u3057\u3001\u4f55\u540d\u304b\u306b\u3088\u3063\u3066\u5f90\u3005\u306b\u79fb\u884c\u3057\u3066\u3044\u304d\u307e\u3057\u305f\u3002\u79fb\u884c\u306e\u5b8c\u4e86\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30b3\u30fc\u30c9\u306b\u306f\u5f8c\u8ff0\u3059\u308b\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3092\u304b\u3051\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u65b0\u3057\u3044\u30b3\u30fc\u30c9\u3067\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u5229\u7528\u3055\u308c\u308b\u3053\u3068\u3092\u9632\u304e\u307e\u3057\u305f\u3002<\/p>\n<p>\u5c11\u3057\u305a\u3064\u79fb\u884c\u3057\u3066\u3044\u304d\u3001\u6700\u7d42\u7684\u306b\u306f\u3059\u3079\u3066\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u3067ergo\u3092\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306b\u3088\u3063\u3066\u5f37\u5236\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>ergo\u306e\u79fb\u884c\u306f\u4e3b\u306b\u624b\u52d5\u3067\u884c\u3044\u307e\u3057\u305f\u304c\u3001\u672c\u8a18\u4e8b\u306e\u57f7\u7b46\u6642\u3067\u3042\u308c\u3070Claude Code\u306a\u3069\u3092\u3082\u3063\u3068\u6d3b\u7528\u3059\u308b\u3067\u3057\u3087\u3046\u3002\u5358\u7d14\u306a\u66f8\u304d\u63db\u3048\u3067\u306f\u3042\u308b\u305f\u3081\u3001\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\uff08ergocheck\uff09\u306b\u4fee\u6b63\u6a5f\u80fd\u3092\u8ffd\u52a0\u3057\u3066\u79fb\u884c\u30d7\u30ed\u30bb\u30b9\u3092\u6574\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u305d\u3046\u3067\u3059\u3002<\/p>\n<p>\u3053\u3046\u3057\u3066\u30d7\u30ed\u30c0\u30af\u30c8\u958b\u767a\u3092\u5927\u304d\u304f\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u306a\u304f\u3001ergo\u3078\u306e\u79fb\u884c\u304c\u5b8c\u4e86\u3057\u307e\u3057\u305f\u3002<\/p>\n<h3 id=\"ergocheck---\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\">ergocheck &#8211; \u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306e\u6d3b\u7528<\/h3>\n<p>ergo\u3092\u5c0e\u5165\u3057\u59cb\u3081\u305f\u5f53\u521d\u306f\u3001<code>errors<\/code>\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3063\u3066\u3057\u307e\u3063\u305f\u308a\u3001\u4f7f\u3044\u65b9\u3092\u9593\u9055\u3048\u305f\u308a\u3068\u3044\u3046\u554f\u984c\u304c\u5ea6\u3005\u8d77\u304d\u3066\u3044\u307e\u3057\u305f\u3002\u305d\u306e\u305f\u3081\u3001<a target=\"_blank\" href=\"https:\/\/pkg.go.dev\/github.com\/newmo-oss\/ergo\/ergocheck\">ergocheck<\/a>\u3068\u3044\u3046\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\uff08Linter\uff09\u3092\u81ea\u4f5c\u3057\u3066\u9632\u3050\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>ergocheck\u306f\u3001\u6b21\u306e4\u3064\u306b\u3064\u3044\u3066\u691c\u51fa\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n<ul>\n<li>errors.New\u95a2\u6570\u3068fmt.Errorf\u95a2\u6570\u306e\u4f7f\u7528<\/li>\n<li>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5185\u306e%d\u3084%s\u306a\u3069\u306e\u6587\u5b57\u5217<\/li>\n<li>nil\u30a8\u30e9\u30fc\u306e\u691c\u51fa<\/li>\n<li>\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u521d\u671f\u5316\u3067\u306eergo.New\u95a2\u6570\u306e\u4f7f\u7528<\/li>\n<\/ul>\n<p><strong>errors.New\u3068fmt.Errorf\u306e\u4f7f\u7528<\/strong><\/p>\n<p>ergo\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u7b87\u6240\u3068\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044\u7b87\u6240\u304c\u6df7\u5728\u3059\u308b\u3068\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u306a\u3044\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u3066\u3057\u307e\u3046\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u3053\u308c\u307e\u3067\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u305f\u7d4c\u9a13\u3092\u3084\u3081\u3089\u308c\u305a\u3001\u3064\u3044\u3064\u3044\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u66f8\u3044\u3066\u3057\u307e\u3046\u3053\u3068\u4e88\u60f3\u3055\u308c\u307e\u3059\u3002\u6700\u8fd1\u3067\u306fCloude Code\u306a\u3069\u306e\u751f\u6210AI\u304c\u66f8\u3044\u305f\u30b3\u30fc\u30c9\u306e\u4e2d\u306b\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u305f\u30b3\u30fc\u30c9\u304c\u6df7\u3056\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306bergo\u306e\u4f7f\u7528\u3092\u5f37\u5236\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3092\u7d71\u4e00\u5316\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u5185\u306e<code>%d<\/code>\u3084<code>%s<\/code>\u306a\u3069\u306e\u6587\u5b57\u5217<\/strong><\/p>\n<p>ergo\u3067\u306f<code>slog.Attr<\/code>\u578b\u3092\u7528\u3044\u3066\u30a8\u30e9\u30fc\u306b\u6587\u8108\u3092\u4e0e\u3048\u307e\u3059\u3002\u6a19\u6e96\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3044\u6163\u308c\u3066\u3044\u308b\u3068<code>%d<\/code>\u3084<code>%s<\/code>\u3092\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u3046\u3063\u304b\u308a\u5165\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u691c\u51fa\u3059\u308b\u3053\u3068\u3067\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u4e0d\u8981\u306a\u60c5\u5831\u3092\u542b\u3081\u305a\u3001\u5c5e\u6027\u3068\u3057\u3066\u30a8\u30e9\u30fc\u306b\u60c5\u5831\u3092\u4ed8\u4e0e\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>nil\u306e\u691c\u51fa<\/strong><\/p>\n<p>ergo\u3067\u306f\u3001<code>ergo.Wrap<\/code>\u95a2\u6570\u3084<code>ergo.WithCode<\/code>\u95a2\u6570\u306a\u3069\u7b2c1\u5f15\u6570\u306b<code>error<\/code>\u578b\u306e\u5024\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306b\u3001\u305d\u306e\u5024\u3092nil\u3092\u6307\u5b9a\u3059\u308b\u3068\u623b\u308a\u5024\u3082<code>nil<\/code>\u306b\u306a\u308a\u307e\u3059\u3002<code>ergo.New<\/code>\u95a2\u6570\u3067\u4f5c\u6210\u3057\u305f\u30a8\u30e9\u30fc\u306e\u4ee3\u308f\u308a\u306b<code>nil<\/code>\u3092\u6e21\u3057\u3066\u3057\u307e\u3044\u3001\u623b\u308a\u5024\u306e\u30a8\u30e9\u30fc\u3082<code>nil<\/code>\u306b\u306a\u3063\u3066\u3044\u305f\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u7b2c1\u5f15\u6570\u306b<code>nil<\/code>\u3092\u6307\u5b9a\u3057\u3066\u3044\u308b\u30b3\u30fc\u30c9\u3092\u691c\u51fa\u3059\u308b\u3053\u3068\u3067\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u7b2c1\u5f15\u6570\u306e<code>nil<\/code>\u3092\u3059\u3079\u3066\u691c\u51fa\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u9014\u4e2d\u306b\u5206\u5c90\u304c\u5165\u3063\u3066\u3057\u307e\u3046\u5834\u5408\u306b\u3046\u307e\u304f\u691c\u51fa\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n<span class=\"synStatement\">func<\/span> f() <span class=\"synType\">error<\/span> {\n    <span class=\"synStatement\">return<\/span> ergo.Wrap(<span class=\"synStatement\">nil<\/span>, <span class=\"synConstant\">\"something failed\"<\/span>)\n}\n\n\n<span class=\"synStatement\">func<\/span> g() <span class=\"synType\">error<\/span> {\n    <span class=\"synStatement\">var<\/span> err <span class=\"synType\">error<\/span>\n    <span class=\"synStatement\">if<\/span> someCondition {\n        err = doSomething()\n    }\n    <span class=\"synStatement\">return<\/span> ergo.Wrap(err, <span class=\"synConstant\">\"something failed\"<\/span>)\n}\n\n\n<span class=\"synStatement\">func<\/span> h() <span class=\"synType\">error<\/span> {\n    err := doSomething()\n    <span class=\"synStatement\">if<\/span> err != <span class=\"synStatement\">nil<\/span> {\n        <span class=\"synStatement\">return<\/span> ergo.Wrap(err, <span class=\"synConstant\">\"something failed\"<\/span>)\n    }\n    <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">nil<\/span>\n}\n<\/pre>\n<p>\u305d\u3053\u3067\u3001\u6614zagane\u3068\u3044\u3046Google Cloud Spanner\u306eLinter\u3092\u4f5c\u3063\u305f\u969b\u306b\u7528\u3044\u305f\u6709\u52b9\u30b0\u30e9\u30d5\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7528\u3044\u3066\u3001\u7b2c1\u5f15\u6570\u304c<code>nil<\/code>\u306b\u306a\u308b\u30d1\u30b9\u304c\u5b58\u5728\u3059\u308b\u304b\u3092\u8abf\u3079\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fengineering.mercari.com%2Fblog%2Fentry%2F2019-06-10-120000%2F\" title=\"Google Cloud Spanner\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30ea\u30fc\u30af\u3092\u9759\u7684\u89e3\u6790\u3067\u9632\u3050\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/engineering.mercari.com\/blog\/entry\/2019-06-10-120000\/\">engineering.mercari.com<\/a><\/cite><\/p>\n<p>\u3053\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u306f\u3001\u5bfe\u8c61\u306e\u30b3\u30fc\u30c9\u3092\u9759\u7684\u5358\u4e00\u4ee3\u5165\uff08SSA\uff09\u5f62\u5f0f\u306b\u5909\u63db\u3057\u3001\u305d\u306e\u5236\u5fa1\u30d5\u30ed\u30fc\u30b0\u30e9\u30d5\u3092\u6709\u5411\u30b0\u30e9\u30d5\u3068\u3057\u3066\u6271\u3046\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3067\u3059\u3002\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u7c21\u7565\u5316\u3057\u305f\u30b3\u30fc\u30c9\u3067\u8868\u73fe\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u8a73\u3057\u3044\u89e3\u8aac\u306f\u540c\u3058\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3092\u4f7f\u3063\u305fzagane\u306e\u30d6\u30ed\u30b0\u3092\u8aad\u3093\u3067\u3044\u305f\u3060\u304f\u304b\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\">\n\n<span class=\"synStatement\">func<\/span> checkNilErr(call *ssa.Call) <span class=\"synType\">bool<\/span> {\n    errarg := call.Call.Args[<span class=\"synConstant\">0<\/span>]\n    <span class=\"synStatement\">return<\/span> isNil(call.Block(), errarg)\n}\n\n\n\n<span class=\"synStatement\">func<\/span> isNil(b *ssa.BasicBlock, v ssa.Value) <span class=\"synType\">bool<\/span> {\n    <span class=\"synStatement\">switch<\/span> v := v.(<span class=\"synStatement\">type<\/span>) {\n    <span class=\"synStatement\">case<\/span> *ssa.Const:\n        <span class=\"synStatement\">return<\/span> v.IsNil()\n    <span class=\"synStatement\">case<\/span> *ssa.Phi:\n        \n        <span class=\"synStatement\">if<\/span> hasNilGuard(b, v) {\n            <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">false<\/span>\n        }\n        \n        <span class=\"synStatement\">for<\/span> _, edge := <span class=\"synStatement\">range<\/span> v.Edges {\n            <span class=\"synStatement\">if<\/span> isNil(b, edge) {\n                <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">true<\/span>\n            }\n        }\n    }\n    <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">false<\/span>\n}\n\n\n\n\n<span class=\"synStatement\">func<\/span> hasNilGuard(b *ssa.BasicBlock, v ssa.Value) <span class=\"synType\">bool<\/span> {\n    guards := findNilGuards(v)\n    <span class=\"synStatement\">if<\/span> <span class=\"synStatement\">len<\/span>(guards) == <span class=\"synConstant\">0<\/span> {\n        <span class=\"synStatement\">return<\/span> <span class=\"synStatement\">false<\/span>\n    }\n    \n    \n    <span class=\"synStatement\">return<\/span> !backtrace(b, guards)\n}\n<\/pre>\n<p><strong>\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u521d\u671f\u5316\u3067\u306e<code>ergo.New<\/code>\u95a2\u6570\u306e\u4f7f\u7528<\/strong><\/p>\n<p><code>ergo.New<\/code>\u95a2\u6570\u3092\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u306e\u5ba3\u8a00\u6587\u306b\u7528\u3044\u3066\u3057\u307e\u3046\u3068\u7121\u7528\u306a\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002ergo\u3067\u306f\u4ee3\u308f\u308a\u306b<code>ergo.NewSentinel<\/code>\u95a2\u6570\u3092\u7528\u3044\u308b\u3088\u3046\u306b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u6848\u5185\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u3060\u3051\u3060\u3068\u3046\u3063\u304b\u308a\u30df\u30b9\u3092\u3057\u3066\u3057\u307e\u3046\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u306b\u7d44\u307f\u8fbc\u3080\u3053\u3068\u3067\u30df\u30b9\u3092\u306a\u304f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>ergocheck\u306f\u3001\u9759\u7684\u5358\u4e00\u4ee3\u5165\uff08SSA: Single Static Assign\uff09\u5f62\u5f0f\u3068\u3044\u3046\u5f62\u5f0f\u306b\u5909\u63db\u3057\u3066\u89e3\u6790\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<code>nil<\/code>\u306e\u691c\u51fa\u3084\u30d1\u30c3\u30b1\u30fc\u30b8\u5909\u6570\u306e\u5ba3\u8a00\u6587\u306e\u89e3\u6790\u306a\u3069\u3001\u9759\u7684\u5358\u4e00\u4ee3\u5165\u5f62\u5f0f\u3092\u7528\u3044\u305f\u89e3\u6790\u30d1\u30bf\u30fc\u30f3\u3068\u3057\u3066\u826f\u3044\u5b9f\u4f8b\u3068\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3092\u958b\u767a\u3057\u3066\u3044\u308b\u65b9\u306f\u305c\u3072\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3082\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3 id=\"\u8907\u6570\u306e\u30b3\u30fc\u30c9\u306e\u4ed8\u52a0\">\u8907\u6570\u306e\u30b3\u30fc\u30c9\u306e\u4ed8\u52a0<\/h3>\n<p>ergo\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u4f5c\u308a\u3092\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u5927\u304d\u306a\u4e0d\u6e80\u306e\u3088\u3046\u306a\u3082\u306e\u306f\u793e\u5185\u30e1\u30f3\u30d0\u30fc\u304b\u3089\u6307\u6458\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u305d\u308c\u3067\u3082 1\u3064\u306e\u30a8\u30e9\u30fc\u306b\u8907\u6570\u306e\u30b3\u30fc\u30c9\u3092\u4ed8\u4e0e\u3057\u305f\u3044\u3068\u3044\u3046\u8981\u671b\u304c\u6319\u304c\u3063\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u73fe\u5728\u306eergo\u3067\u306f\u30011\u3064\u306e\u30a8\u30e9\u30fc\u306b\u8907\u6570\u306e\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3082\u3061\u308d\u3093\u3001<code>ergo.WithCode<\/code>\u95a2\u6570\u3092\u4f55\u91cd\u306b\u3082\u5b9f\u884c\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u306e\u3088\u3046\u306b\u4ed8\u4e0e\u3055\u308c\u305f\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u306f\u3001\u6700\u5f8c\u306b\u4ed8\u4e0e\u3057\u305f1\u3064\u3057\u304b\u53d6\u5f97\u3067\u304d\u307e\u305b\u3093\u3002\u307e\u305f\u3001<code>errors.Join<\/code>\u95a2\u6570\u3067\u8907\u6570\u306e\u30b3\u30fc\u30c9\u3092\u6301\u3064\u30a8\u30e9\u30fc\u304c\u7d50\u5408\u3055\u308c\u305f\u5834\u5408\u3082\u540c\u69d8\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f<code>ergo.CodeOf<\/code>\u95a2\u6570\u304c<code>errors.As<\/code>\u95a2\u6570\uff08Go1.26\u4ee5\u964d\u3067\u306ferrors.AsType\u95a2\u6570\uff09\u3092\u7528\u3044\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002ergo\u5185\u90e8\u3067\u306f\u3001\u30b3\u30fc\u30c9\u3092\u6301\u3064\u30a8\u30e9\u30fc\u3092<code>codedError<\/code>\u3068\u3044\u3046\u69cb\u9020\u4f53\u578b\u3068\u3057\u3066\u5ba3\u8a00\u3057\u3001\u305d\u306e\u30dd\u30a4\u30f3\u30bf\u578b\u304cerrors\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<code>errors.As<\/code>\u95a2\u6570\u306f\u30e9\u30c3\u30d7\u3055\u308c\u305f\u30a8\u30e9\u30fc\u306e\u30c1\u30a7\u30a4\u30f3\u3092\u6df1\u3055\u512a\u5148\u63a2\u7d22\u3067\u63a2\u7d22\u3057\u3001\u6700\u521d\u306b\u898b\u3064\u3051\u305f\u8a72\u5f53\u3059\u308b\u578b\u306e\u30a8\u30e9\u30fc\u3092\u8fd4\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u8a72\u5f53\u3059\u308b\u30a8\u30e9\u30fc\u578b\u304c\u305d\u306e\u4e2d\u306b\u8907\u6570\u500b\u542b\u307e\u308c\u3066\u3044\u3066\u3082\u6700\u521d\u306e1\u3064\u3060\u3051\u3057\u304b\u8fd4\u3057\u307e\u305b\u3093\u3002<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/go.dev\/issue\/66455\">issue#66455<\/a>\u3067\u63d0\u6848\u3055\u308c\u3066\u3044\u305f<code>errors.All<\/code>\u95a2\u6570\u3084<code>errors.AllAs<\/code>\u95a2\u6570\u304c\u5c0e\u5165\u3055\u308c\u3066\u3044\u308c\u3070\u7c21\u5358\u306b\u5b9f\u73fe\u3067\u304d\u307e\u3057\u305f\u304c\u3001\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u304c\u4e4f\u3057\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u4e0d\u63a1\u629e\u306b\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u57f7\u7b46\u6642\u70b9\u3067\u5f37\u3044\u8981\u671b\u304c\u793e\u5185\u304b\u3089\u51fa\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u305f\u3081\u3001OSS\u3068\u3057\u3066\u5229\u7528\u3057\u3066\u3044\u305f\u3060\u3044\u3066\u8981\u671b\u304c\u5f37\u305d\u3046\u3067\u3042\u308c\u3070\u3001\u826f\u3044\u5b9f\u88c5\u65b9\u6cd5\u3092\u6a21\u7d22\u3057\u3066\u3044\u3053\u3046\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3 id=\"\u793e\u5185\u30e1\u30f3\u30d0\u30fc\u304b\u3089\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u6539\u5584\u70b9\">\u793e\u5185\u30e1\u30f3\u30d0\u30fc\u304b\u3089\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u6539\u5584\u70b9<\/h3>\n<p>\u672c\u8a18\u4e8b\u3092\u57f7\u7b46\u3059\u308b\u306b\u3042\u305f\u3063\u3066\u3001\u793e\u5185\u30e1\u30f3\u30d0\u30fc\u306b\u6539\u5584\u70b9\u3092\u52df\u96c6\u3057\u307e\u3057\u305f\u3002\u7b46\u8005\u672c\u4eba\u304b\u3089\u306e\u3082\u306e\u3092\u542b\u3081\u3044\u304f\u3064\u304b\u96c6\u307e\u3063\u305f\u306e\u3067\u3001\u3053\u3053\u306b\u63b2\u8f09\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5c5e\u6027\u3092\u8ffd\u52a0\u5fd8\u308c\u304c\u591a\u3044<\/li>\n<li><code>ergo.With<\/code>\u95a2\u6570\u3092\u8ffd\u52a0\u3057\u3001\u95a2\u6570\u306e\u5148\u982d\u3067\u5171\u901a\u306e\u5c5e\u6027\u3092\u4ed8\u4e0e\u3057\u305f\u3044<\/li>\n<li>ergocheck\u3092Suggested Fix\u306b\u5bfe\u5fdc\u3055\u305b\u3001Go1.26\u3067\u5c0e\u5165\u3055\u308c\u308b<code>go fix<\/code>\u30b3\u30de\u30f3\u30c9\u306b\u5bfe\u5fdc\u3055\u305b\u3066\u307b\u3057\u3044<\/li>\n<\/ul>\n<p>\u3069\u308c\u3082\u65e5\u9803\u306e\u958b\u767a\u3067\u4f7f\u7528\u3057\u3066\u3044\u304f\u4e2d\u3067\u6319\u304c\u3063\u3066\u304d\u305f\u3082\u306e\u306a\u306e\u3067\u7d0d\u5f97\u611f\u306e\u3042\u308b\u8981\u671b\u3067\u3059\u3002\u5b9f\u88c5\u81ea\u4f53\u306f\u96e3\u3057\u3044\u3082\u306e\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u5229\u4fbf\u6027\u306e\u5411\u4e0a\u3068\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u3092\u5929\u79e4\u306b\u304b\u3051\u306a\u304c\u3089\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n<h2 id=\"\u304a\u308f\u308a\u306b\">\u304a\u308f\u308a\u306b<\/h2>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001newmo\u793e\u5185\u3067\u958b\u767a\u3057\u305fergo\u3068\u3044\u3046\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u7d39\u4ecb\u30681\u5e74\u9593\u306e\u904b\u7528\u306e\u632f\u308a\u8fd4\u308a\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u65e9\u3044\u6bb5\u968e\u3067\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb\u3092\u5c0e\u5165\u3057\u305f\u3053\u3068\u306b\u3088\u308a\u3001\u79fb\u884c\u306f\u5927\u304d\u306a\u554f\u984c\u306f\u306a\u304f\u884c\u308f\u308c\u307e\u3057\u305f\u3002<\/p>\n<p>Go\u306e\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u304a\u56f0\u308a\u306e\u5834\u5408\u306f\u305c\u3072ergo\u3092\u9078\u629e\u80a2\u306e1\u3064\u306b\u8003\u3048\u3066\u307f\u3066\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<\/div>\n<p><script>(function(d, s, id) {\n  var js, fjs = d.getElementsByTagName(s)[0];\n  if (d.getElementById(id)) return;\n  js = d.createElement(s); js.id = id;\n  js.src = \"\/\/connect.facebook.net\/ja_JP\/sdk.js#xfbml=1&appId=719729204785177&version=v17.0\";\n  fjs.parentNode.insertBefore(js, fjs);\n}(document, 'script', 'facebook-jssdk'));<\/script><br \/>\n<br \/>\n<br \/><a href=\"https:\/\/tech.newmo.me\/entry\/2025\/12\/07\/090000\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\u306f\u3058\u3081\u306b Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406 Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306b\u4f55\u304b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f \u3053\u306e\u8cea\u554f\u306fGo 1.0\u306e\u30ea\u30ea\u30fc\u30b9\u304b\u308910\u5e74\u4ee5\u4e0a\u7d4c\u3064\u4eca\u3067\u3082\u3001\u65e5\u672c\u306eGo\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u3067\u3088\u304f\u3055\u308c\u308b\u8cea\u554f\u3067\u3059\u3002\u7b46\u8005\uff08tenntenn\uff09\u3082\u3088\u304f\u4ed6\u793e\u306e [&hellip;]","protected":false},"author":1,"featured_media":26784,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-26783","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hatena-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ergo - Go\u306e\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u81ea\u4f5c\u3057\u30661\u5e74\u9593\u5229\u7528\u3057\u3066\u307f\u305f\u632f\u308a\u8fd4\u308a - newmo \u6280\u8853\u30d6\u30ed\u30b0 - \u30dd\u30b1\u30b3\u30f3<\/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:\/\/tech.newmo.me\/entry\/2025\/12\/07\/090000\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ergo - Go\u306e\u30a8\u30e9\u30fc\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u81ea\u4f5c\u3057\u30661\u5e74\u9593\u5229\u7528\u3057\u3066\u307f\u305f\u632f\u308a\u8fd4\u308a - newmo \u6280\u8853\u30d6\u30ed\u30b0 - \u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"og:description\" content=\"\u306f\u3058\u3081\u306b Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406 Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306b\u4f55\u304b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u304b\uff1f \u3053\u306e\u8cea\u554f\u306fGo 1.0\u306e\u30ea\u30ea\u30fc\u30b9\u304b\u308910\u5e74\u4ee5\u4e0a\u7d4c\u3064\u4eca\u3067\u3082\u3001\u65e5\u672c\u306eGo\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u3067\u3088\u304f\u3055\u308c\u308b\u8cea\u554f\u3067\u3059\u3002\u7b46\u8005\uff08tenntenn\uff09\u3082\u3088\u304f\u4ed6\u793e\u306e [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tech.newmo.me\/entry\/2025\/12\/07\/090000\" \/>\n<meta property=\"og:site_name\" content=\"\u30dd\u30b1\u30b3\u30f3\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-07T03:05:42+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pokecon.jp\/job\/wp-content\/uploads\/2025\/12\/1765065605.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"info@pokecon.jp\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"info@pokecon.jp\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"4\u5206\" \/>\n<script type=\"application\/ld+json\" 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