{"id":588942,"date":"2025-08-04T04:46:17","date_gmt":"2025-08-04T03:46:17","guid":{"rendered":"https:\/\/blog.jetbrains.com\/go\/2025\/07\/28\/interprocedural-analysis-catch-nil-dereferences-before-they-crash-your-code\/"},"modified":"2025-08-04T04:46:23","modified_gmt":"2025-08-04T03:46:23","slug":"interprocedural-analysis-catch-nil-dereferences-before-they-crash-your-code","status":"publish","type":"go","link":"https:\/\/blog.jetbrains.com\/ja\/go\/2025\/08\/04\/interprocedural-analysis-catch-nil-dereferences-before-they-crash-your-code\/","title":{"rendered":"\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u89e3\u6790: nil \u9006\u53c2\u7167\u3092\u691c\u51fa\u3057\u3066\u30b3\u30fc\u30c9\u306e\u30af\u30e9\u30c3\u30b7\u30e5\u3092\u9632\u6b62"},"content":{"rendered":"\n<p>\u6b21\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b GoLand 2025.2 \u3067\u306f\u3001\u3088\u308a\u5b89\u5168\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044 Go \u30b3\u30fc\u30c9\u306e\u4f5c\u6210\u3092\u652f\u63f4\u3059\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u305f\u5f37\u529b\u306a\u65b0\u6a5f\u80fd\u3068\u6a5f\u80fd\u6539\u5584\u304c\u307e\u3068\u3081\u3066\u5c0e\u5165\u3055\u308c\u307e\u3059\u3002 \u3059\u3079\u3066\u306e\u66f4\u65b0\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/pleiades.io\/help\/go\/2025.2\/release-notes-goland.html\" target=\"_blank\" rel=\"noopener\">\u30ea\u30ea\u30fc\u30b9\u30ce\u30fc\u30c8<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002&nbsp;<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u6700\u3082\u91cd\u8981\u306a\u65b0\u6a5f\u80fd\u306e 1 \u3064\u3067\u3042\u308b <code>nil<\/code> \u30dd\u30a4\u30f3\u30bf\u30fc\u306e\u9006\u53c2\u7167\u3092\u691c\u51fa\u3059\u308b\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u30b3\u30fc\u30c9\u89e3\u6790\u3092\u96c6\u4e2d\u7684\u306b\u53d6\u308a\u4e0a\u3052\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u6539\u5584\u306f\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3084\u30c6\u30b9\u30c8\u304b\u3089\u6f0f\u308c\u304c\u3061\u306a\u6349\u3048\u306b\u304f\u3044\u30d0\u30b0\u3092\u691c\u51fa\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u672c\u756a\u30b3\u30fc\u30c9\u3092\u3088\u308a\u5b89\u5b9a\u3055\u305b\u3001\u4fdd\u5b88\u3057\u3084\u3059\u304f\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>GoLand \u30c1\u30fc\u30e0\u306f\u958b\u767a\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u3001\u5384\u4ecb\u306a\u5b9f\u884c\u6642\u306e\u30d1\u30cb\u30c3\u30af\u3092\u56de\u907f\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3001\u3088\u308a\u8a73\u7d30\u3067\u30b9\u30de\u30fc\u30c8\u306a\u9759\u7684\u89e3\u6790\u306e\u63d0\u4f9b\u306b\u591a\u5927\u306a\u52b4\u529b\u3092\u8cbb\u3084\u3057\u3066\u304d\u307e\u3057\u305f\u3002 GitHub \u304b\u3089<a href=\"https:\/\/github.com\/JetBrains\/goland-documentation-samples\/tree\/main\/nilDereferenceAnalysis\" target=\"_blank\" rel=\"noopener\">\u3053\u3061\u3089\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/a>\u3092\u30af\u30ed\u30fc\u30f3\u3059\u308b\u3068\u3001\u3053\u306e\u6a5f\u80fd\u3092 IDE \u3067\u8a66\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Go \u306b\u304a\u3051\u308b <strong><code>nil<\/code><\/strong> \u30dd\u30a4\u30f3\u30bf\u30fc\u306e\u9006\u53c2\u7167<\/h2>\n\n\n\n<p>Go \u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3088\u304f\u3042\u308b\u96e3\u984c\u306e\u4ee3\u8868\u4f8b\u306b\u306f\u3001<code>nil<\/code> \u30dd\u30a4\u30f3\u30bf\u30fc\u306e\u9006\u53c2\u7167\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u96e3\u984c\u306f\u3001\u307b\u307c\u3059\u3079\u3066\u306e Go \u958b\u767a\u8005\u304c\u4f55\u3089\u304b\u306e\u6642\u70b9\u3067\u906d\u9047\u3057\u305f\u3053\u3068\u304c\u3042\u308b\u306f\u305a\u3067\u3059\u3002 Go \u306f\u5358\u7d14\u3067\u5f37\u529b\u306a\u9759\u7684\u578b\u4ed8\u3051\u8a00\u8a9e\u3067\u3042\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305a\u3001<code>nil<\/code> \u306f\u4eca\u3067\u3082\u6349\u3048\u306b\u304f\u304f\u3001\u983b\u767a\u3059\u308b\u91cd\u5927\u306a\u30d0\u30b0\u306e\u539f\u56e0\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><code>nil<\/code> \u9006\u53c2\u7167\u306e\u5f71\u97ff\u306f\u3001\u7279\u306b\u672c\u756a\u74b0\u5883\u3067\u306f\u6df1\u523b\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002 \u4e88\u671f\u3057\u306a\u3044\u9006\u53c2\u7167 1 \u3064\u3067\u30b5\u30fc\u30d3\u30b9\u5168\u4f53\u304c\u30af\u30e9\u30c3\u30b7\u30e5\u3057\u3001\u307b\u307c\u8b66\u544a\u306a\u3057\u306b API \u3084\u30ef\u30fc\u30ab\u30fc\u30d7\u30ed\u30bb\u30b9\u304c\u505c\u6b62\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002&nbsp;<\/p>\n\n\n\n<p>Go \u3067\u306f\u3001\u3055\u3089\u306b\u6349\u3048\u306b\u304f\u3044\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002 \u305f\u3068\u3048\u3070 <code>nil<\/code> \u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u66f8\u304d\u8fbc\u307f\u3092\u884c\u3046\u3068\u3001\u30b4\u30eb\u30fc\u30c1\u30f3\u304c\u6c38\u4e45\u306b\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3057\u307e\u3044\u3001\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u3084\u9023\u9396\u7684\u306a\u30b7\u30b9\u30c6\u30e0\u969c\u5bb3\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 \u521d\u671f\u5316\u3055\u308c\u3066\u3044\u306a\u3044 <code>nil<\/code> \u30dd\u30a4\u30f3\u30bf\u30fc\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u5373\u5ea7\u306b\u30d1\u30cb\u30c3\u30af\u304c\u767a\u751f\u3057\u307e\u3059\u3002 \u3053\u306e\u3088\u3046\u306a\u30a8\u30e9\u30fc\u306f\u898b\u9003\u3057\u3084\u3059\u304f\u3001\u4e00\u65e6\u30c7\u30d7\u30ed\u30a4\u3055\u308c\u3066\u3057\u307e\u3046\u3068\u539f\u56e0\u3092\u3055\u304b\u306e\u307c\u308b\u306e\u306f\u56f0\u96e3\u3067\u3059\u3002<\/p>\n\n\n\n<p><code>nil<\/code> \u9006\u53c2\u7167\u306e\u554f\u984c\u306f\u5165\u5ff5\u306a\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3084\u30c6\u30b9\u30c8\u3067\u691c\u51fa\u53ef\u80fd\u306a\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u5fc5\u305a\u3057\u3082\u5341\u5206\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u30da\u30fc\u30b9\u306e\u901f\u3044\u958b\u767a\u30b5\u30a4\u30af\u30eb\u3084\u5927\u898f\u6a21\u306a\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3067\u306f\u3001\u6349\u3048\u306b\u304f\u3044 <code>nil<\/code> \u95a2\u9023\u306e\u30d0\u30b0\u304c\u5bb9\u6613\u306b\u6f5c\u308a\u8fbc\u3093\u3067\u3057\u307e\u3044\u307e\u3059\u3002 \u3053\u306e\u3088\u3046\u306a\u554f\u984c\u306f\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u4e2d\u306b\u65e9\u6025\u306b\u81ea\u52d5\u691c\u51fa\u3055\u308c\u308b\u306e\u304c\u7406\u60f3\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u3053\u3067\u9759\u7684\u30b3\u30fc\u30c9\u89e3\u6790\u306e\u51fa\u756a\u3067\u3059\u3002 GoLand \u306b\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u306e\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u89e3\u6790\u3092\u5b9f\u884c\u3059\u308b <code>nil<\/code> \u9006\u53c2\u7167\u30a4\u30f3\u30b9\u30da\u30af\u30b7\u30e7\u30f3\u304c\u3042\u3089\u304b\u3058\u3081\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u30a4\u30f3\u30b9\u30da\u30af\u30b7\u30e7\u30f3\u306f\u591a\u304f\u306e\u4e00\u822c\u7684\u306a\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u5341\u5206\u306b\u6a5f\u80fd\u3057\u30011 \u3064\u306e\u95a2\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u30dd\u30a4\u30f3\u30bf\u30fc\u304c <code>nil<\/code> \u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u3092\u691c\u51fa\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u73fe\u5728\u306e\u89e3\u6790\u306f\u500b\u3005\u306e\u95a2\u6570\u5185\u3067\u3057\u304b\u6a5f\u80fd\u3057\u307e\u305b\u3093\u3002 \u5024\u304c\u3069\u306e\u3088\u3046\u306b\u95a2\u6570\u9593\u3092\u79fb\u52d5\u3059\u308b\u306e\u304b\u306f\u8ffd\u8de1\u3057\u306a\u3044\u305f\u3081\u3001\u8907\u6570\u306e\u547c\u3073\u51fa\u3057\u304c\u4f34\u3046\u554f\u984c\u306f\u53d6\u308a\u3053\u307c\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 \u3053\u306e\u3088\u3046\u306a\u6bd4\u8f03\u7684\u8907\u96d1\u306a\u30b1\u30fc\u30b9\u306f\u5b9f\u969b\u306e Go \u306e\u30b3\u30fc\u30c9\u3067\u306f\u3088\u304f\u767a\u751f\u3059\u308b\u3082\u306e\u3067\u3001\u6700\u3082\u5371\u967a\u3067\u3042\u308b\u3053\u3068\u3082\u3057\u3070\u3057\u3070\u3067\u3059\u3002 \u3053\u306e\u3088\u3046\u306a\u554f\u984c\u3092\u691c\u51fa\u3059\u308b\u305f\u3081\u3001\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u30b3\u30fc\u30c9\u89e3\u6790\u3068\u3044\u3046\u3088\u308a\u5f37\u529b\u306a\u6a5f\u80fd\u3092\u5b9f\u88c5\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u30b3\u30fc\u30c9\u89e3\u6790<\/h2>\n\n\n\n<p>\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u30b3\u30fc\u30c9\u89e3\u6790\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u89e3\u6790\u3068\u3082\u547c\u3070\u308c\u3001\u5024\u304c\u3069\u306e\u3088\u3046\u306b\u95a2\u6570\u547c\u3073\u51fa\u3057\u9593\u3092\u79fb\u52d5\u3059\u308b\u306e\u304b\u3092\u628a\u63e1\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 1 \u3064\u306e\u95a2\u6570\u3060\u3051\u3067\u306a\u304f\u3001\u30d5\u30a1\u30a4\u30eb\u3084\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u6a2a\u65ad\u3057\u3066\u30c7\u30fc\u30bf\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002 \u3053\u308c\u3068\u306f\u5bfe\u7167\u7684\u306b\u3001\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u5185\u89e3\u6790\u3084\u30ed\u30fc\u30ab\u30eb\u89e3\u6790\u3067\u306f 1 \u3064\u306e\u95a2\u6570\u5185\u306e\u52d5\u4f5c\u306e\u307f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002 \u30ed\u30fc\u30ab\u30eb\u306e\u554f\u984c\u306f\u30011 \u3064\u306e\u95a2\u6570\u3092\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u691c\u51fa\u3057\u3084\u3059\u3044\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002 \u3057\u304b\u3057\u3001\u5168\u4f53\u7684\u306a\u554f\u984c\u3092\u691c\u51fa\u3059\u308b\u306e\u306f\u6bd4\u8f03\u7684\u56f0\u96e3\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001<code>nil<\/code> \u5024\u306a\u3069\u306e\u554f\u984c\u306e\u539f\u56e0\u304c\u30a8\u30e9\u30fc\u767a\u751f\u500b\u6240\u304b\u3089\u96e2\u308c\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002 \u305d\u306e\u305f\u3081\u3001\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u89e3\u6790\u306f <code>nil<\/code> \u9006\u53c2\u7167\u306e\u554f\u984c\u3092\u691c\u51fa\u3059\u308b\u306e\u306b\u7279\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d5\u30ed\u30fc\u306e\u8ffd\u8de1: <strong><code>nil<\/code><\/strong> \u9006\u53c2\u7167\u3092\u628a\u63e1\u3059\u308b<\/h3>\n\n\n\n<p>\u3067\u306f\u3001\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002 \u3053\u306e\u30b3\u30fc\u30c9\u306f\u975e\u5e38\u306b\u5358\u7d14\u306b\u898b\u3048\u307e\u3059\u3002 \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u3092\u4f7f\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002 \u3057\u304b\u3057\u3001\u89e3\u6790\u3067\u306f <code>user.Age<\/code> \u304c\u539f\u56e0\u3067 <code>nil<\/code> \u9006\u53c2\u7167\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3068\u8b66\u544a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"728\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.1-main.png\" alt=\"\" class=\"wp-image-583380\"\/><\/figure>\n\n\n\n<p>\u3053\u308c\u3092\u624b\u4f5c\u696d\u3067\u8abf\u67fb\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002 \u72b6\u6cc1\u3092\u628a\u63e1\u3059\u308b\u306b\u306f\u3001<code>NewUser<\/code> \u95a2\u6570\u304c\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u898b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002 \u3053\u306e\u95a2\u6570\u306f\u3001<code><a href=\"http:\/\/model.go\" target=\"_blank\" rel=\"noopener\">model.go<\/a><\/code> \u3068\u3044\u3046\u5225\u306e\u30d5\u30a1\u30a4\u30eb\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"769\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.2-NewUser.png\" alt=\"\" class=\"wp-image-583435\"\/><\/figure>\n\n\n\n<p>\u3053\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306f\u5c11\u3057\u5947\u5999\u3067\u3059\u3002<code>NewUser<\/code> \u304c\u30a8\u30e9\u30fc\u767a\u751f\u6642\u306b <code>nil<\/code> \u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u304c\u3001<code>main<\/code> \u3067\u306f\u305d\u306e\u7d50\u679c\u3092\u30c1\u30a7\u30c3\u30af\u305b\u305a\u306b\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002 \u3053\u308c\u306b\u3088\u308a\u3001\u6f5c\u5728\u7684\u306a <code>nil<\/code> \u9006\u53c2\u7167\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u3001\u7d50\u679c\u3068\u30a8\u30e9\u30fc\u306e\u4e21\u65b9\u3092\u8fd4\u3059\u3088\u3046\u306b <code>NewUser<\/code> \u3092\u66f8\u304d\u76f4\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u3088\u308a Go \u3089\u3057\u3044\u66f8\u304d\u65b9\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"1666\" data-id=\"583457\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.3-main-NewUser-fix-1.png\" alt=\"\" class=\"wp-image-583457\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u3053\u308c\u3067\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u6027\u304c\u9ad8\u307e\u308a\u307e\u3057\u305f\u3002 <code>nil<\/code> \u306e\u9006\u53c2\u7167\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u3092\u306a\u304f\u3059\u305f\u3081\u3001<code>user<\/code> \u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u524d\u306b\u30a8\u30e9\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002 \u3053\u306e\u30b3\u30fc\u30c9\u306f\u6b63\u3057\u304f\u898b\u3048\u307e\u3059\u304c\u3001\u305d\u308c\u3067\u3082\u540c\u3058\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6319\u52d5\u3092\u8abf\u3079\u308b\u305f\u3081\u3001<code>CreateUser<\/code> \u306e\u5b9f\u88c5\u3092\u3055\u3089\u306b\u6398\u308a\u4e0b\u3052\u3066\u8a73\u3057\u304f\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"988\" data-id=\"583468\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.4-CreateUser.png\" alt=\"\" class=\"wp-image-583468\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u3053\u3053\u3067\u3001\u554f\u984c\u306e 2 \u3064\u76ee\u306e\u539f\u56e0\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p><code>CreateUser<\/code> \u95a2\u6570\u3067\u306f\u3001\u30b3\u30fc\u30c9\u304c <code>user<\/code> \u3068 <code>error<\/code> \u306e\u4e21\u65b9\u306b <code>nil<\/code> \u3092\u8fd4\u3059\u30b1\u30fc\u30b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"340\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.5-CreateUser-return-nil-nil.png\" alt=\"\" class=\"wp-image-583479\"\/><\/figure>\n\n\n\n<p>\u3053\u308c\u306f\u30a8\u30e9\u30fc\u51e6\u7406\u3067\u975e\u5e38\u306b\u3088\u304f\u3042\u308b\u30df\u30b9\u3067\u3059\u3002 \u30a8\u30e9\u30fc\u306a\u3057\u3067 <code>nil<\/code> \u3092\u8fd4\u305b\u3070\u6b63\u5e38\u306b\u51e6\u7406\u304c\u5b8c\u4e86\u3057\u305f\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u5b9f\u969b\u306e\u7d50\u679c\u306f\u6709\u52b9\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u547c\u3073\u51fa\u3057\u5143\u306f\u305d\u306e\u30a8\u30e9\u30fc\u306e\u307f\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u305d\u308c\u304c <code>nil<\/code> \u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u5f8c\u3001\u7d50\u679c\u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002 \u3053\u306e\u4f8b\u3067\u306f\u3001\u305d\u308c\u304c\u539f\u56e0\u3067\u30b3\u30fc\u30c9\u304c <code>user.Age<\/code> \u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u30af\u30e9\u30c3\u30b7\u30e5\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u306f\u3001\u5165\u529b\u304c\u6709\u52b9\u3067\u306a\u3044\u5834\u5408\u306b\u5b9f\u969b\u306e\u30a8\u30e9\u30fc\u3092\u8fd4\u3059\u3053\u3068\u3067\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"3200\" height=\"340\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.6-CreateUser-return-nil-nil-fix.png\" alt=\"\" class=\"wp-image-583490\"\/><\/figure>\n\n\n\n<p>\u3053\u306e\u5909\u66f4\u306b\u3088\u3063\u3066\u30b3\u30fc\u30c9\u304c\u6b63\u3057\u304f\u306a\u308a\u3001\u30a4\u30f3\u30b9\u30da\u30af\u30b7\u30e7\u30f3\u3067 nil \u9006\u53c2\u7167\u304c\u5831\u544a\u3055\u308c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u554f\u984c\u3092\u624b\u4f5c\u696d\u3067\u767a\u898b\u3059\u308b\u306b\u306f\u3001\u6642\u9593\u3082\u624b\u9593\u3082\u304b\u304b\u308a\u307e\u3059\u3002\u5927\u898f\u6a21\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306a\u3089\u306a\u304a\u3055\u3089\u3067\u3059\u3002 <code>nil<\/code> \u5024\u304c\u4f5c\u6210\u3055\u308c\u308b\u5834\u6240\u304c\u554f\u984c\u306e\u539f\u56e0\u304b\u3089\u96e2\u308c\u3066\u3044\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u3053\u306e\u3088\u3046\u306a\u554f\u984c\u306f\u691c\u51fa\u3055\u308c\u305f\u6642\u70b9\u3067 GoLand \u306e\u30a8\u30c7\u30a3\u30bf\u30fc\u5185\u3067\u30cf\u30a4\u30e9\u30a4\u30c8\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002 \u3053\u308c\u3089\u306e\u8b66\u544a\u306b\u5bfe\u3057\u3066\u306f\u3001<em>Explain potential nil dereference<\/em>\uff08\u6f5c\u5728\u7684\u306a nil \u9006\u53c2\u7167\u3092\u8aac\u660e\uff09\u3068\u3044\u3046\u5c02\u7528\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u3053\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u547c\u3073\u51fa\u3059\u3068 <em>Data Flow Analysis<\/em>\uff08\u30c7\u30fc\u30bf\u30d5\u30ed\u30fc\u89e3\u6790\uff09\u30c4\u30fc\u30eb\u30a6\u30a3\u30f3\u30c9\u30a6\u304c\u958b\u304d\u3001\u305d\u306e\u4e2d\u3067 <code>nil<\/code> \u5024\u304c\u30b3\u30fc\u30c9\u5185\u3092\u3069\u306e\u3088\u3046\u306b\u901a\u904e\u3057\u3001\u6700\u7d42\u7684\u306b\u3069\u3053\u3067\u4f7f\u7528\u3055\u308c\u308b\u306e\u304b\u304c\u9806\u3092\u8ffd\u3063\u3066\u8aac\u660e\u3055\u308c\u307e\u3059\u3002 \u305d\u306e\u305f\u3081\u3001\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u5168\u4f53\u3092\u7db2\u7f85\u7684\u306b\u691c\u7d22\u3057\u306a\u304f\u3066\u3082\u3001\u554f\u984c\u3092\u3088\u308a\u7c21\u5358\u306b\u7406\u89e3\u3057\u3066\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-1.7-DFA-toolwindow-movie.mov\"><\/video><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><code>nil<\/code> \u304c\u53d6\u308a\u3053\u307c\u3055\u308c\u305f\u5834\u5408: \u5b89\u5168\u3067\u306a\u3044\u5f15\u6570\u3068\u30ec\u30b7\u30fc\u30d0\u30fc\u3092\u691c\u51fa\u3059\u308b<\/h3>\n\n\n\n<p>\u3053\u306e\u89e3\u6790\u306f <code>return<\/code> \u5024\u3092\u8ffd\u8de1\u3059\u308b\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u95a2\u6570\u304c\u975e nil \u306e\u5f15\u6570\u3092\u5fc5\u8981\u3068\u3057\u3066\u3044\u308b\u306e\u304b\u3001\u3042\u308b\u3044\u306f\u5b89\u5168\u306b <code>nil<\/code> \u3092\u53d7\u3051\u5165\u308c\u53ef\u80fd\u306a\u306e\u304b\u3092\u7406\u89e3\u3057\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306e nil \u8a31\u5bb9\u6027\u306b\u3064\u3044\u3066\u63a8\u8ad6\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002 \u3053\u308c\u306f\u3001<code>nil<\/code> \u5024\u304c\u305d\u308c\u3092\u9069\u5207\u306b\u51e6\u7406\u3057\u306a\u3044\u95a2\u6570\u306b\u610f\u56f3\u305b\u305a\u6e21\u3055\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u3092\u691c\u51fa\u3059\u308b\u306e\u306b\u7279\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5225\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-5 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"756\" data-id=\"583512\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-2.1-prcoess.png\" alt=\"\" class=\"wp-image-583512\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u3053\u3053\u3067\u306f\u3001<code>user<\/code> \u306b\u5bfe\u3057\u3066 <code>Copy<\/code> \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002 \u305d\u308c\u3068\u540c\u6642\u306b\u3001\u5b89\u5168\u306a\u5b9f\u88c5\u3067\u3042\u308b\u3068\u3044\u3046\u524d\u63d0\u3067 <code>nil<\/code> \u3092\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u3057\u3066\u6e21\u3057\u3066\u3044\u307e\u3059\u3002&nbsp;<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u30a4\u30f3\u30b9\u30da\u30af\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<code>nil<\/code> \u5024\u3092\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u3057\u3066\u6e21\u3059\u3068\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5f15\u6570\u306b\u3088\u3063\u3066 <code>nil<\/code> \u9006\u53c2\u7167\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002 <code>Copy<\/code> \u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"960\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-2.2-Copy.png\" alt=\"\" class=\"wp-image-583523\" style=\"aspect-ratio:3.339583333333333;width:840px;height:auto\"\/><\/figure>\n\n\n\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001<code>ctx<\/code> \u304c <code>nil<\/code> \u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u305b\u305a\u306b <code>ctx.isDebugEnabled<\/code> \u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u307e\u3059\u3002 <code>ctx<\/code> \u304c <code>nil<\/code> \u3067\u3042\u308c\u3070\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u5b9f\u884c\u6642\u306b\u30d1\u30cb\u30c3\u30af\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u3001\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u524d\u306b\u660e\u793a\u7684\u306a <code>nil<\/code> \u30c1\u30a7\u30c3\u30af\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u3059\u308b\u3068\u3001<code>ctx<\/code> \u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092 nil \u5b89\u5168\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-7 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"324\" data-id=\"583534\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-2.3-Copy-ctx-fix.png\" alt=\"\" class=\"wp-image-583534\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u3053\u306e\u5909\u66f4\u306b\u3088\u3063\u3066\u30b3\u30fc\u30c9\u304c\u5b89\u5168\u306b\u306a\u308a\u3001\u547c\u3073\u51fa\u3057\u30b5\u30a4\u30c8\u306e\u8b66\u544a\u304c\u6d88\u3048\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-9 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"848\" data-id=\"583545\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-2.4-process.png\" alt=\"\" class=\"wp-image-583545\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u554f\u984c\u306f\u3053\u308c\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u3053\u306e\u89e3\u6790\u3067\u306f\u3001<code>user<\/code> \u5909\u6570\u306b\u95a2\u9023\u3059\u308b\u6f5c\u5728\u7684\u306a <code>nil<\/code> \u9006\u53c2\u7167\u3082\u5831\u544a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u7406\u7531\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u3001<em>Explain potential nil dereference<\/em>\uff08\u6f5c\u5728\u7684\u306a nil \u9006\u53c2\u7167\u3092\u8aac\u660e\uff09\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-2.5-DFA-toolwindow-movie.mov\"><\/video><\/figure>\n\n\n\n<p><code>process<\/code> \u95a2\u6570\u306f <code>user<\/code> \u304c <code>nil<\/code> \u306b\u306a\u308b\u3053\u3068\u3092\u8a31\u5bb9\u3057\u3066\u304a\u308a\u3001\u305d\u308c\u3092\u30c1\u30a7\u30c3\u30af\u305b\u305a\u306b <code>Copy<\/code> \u306b\u6e21\u3057\u3066\u3044\u307e\u3059\u3002&nbsp;<\/p>\n\n\n\n<p><code>Copy<\/code> \u30e1\u30bd\u30c3\u30c9\u306e\u5185\u90e8\u3067\u306f\u3001\u30ec\u30b7\u30fc\u30d0\u30fc <code>u<\/code> \u304c\u30c1\u30a7\u30c3\u30af\u3055\u308c\u308b\u524d\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u5177\u4f53\u7684\u306b\u306f\u3001<code>u<\/code> \u304c <code>logUserEvent<\/code> \u95a2\u6570\u306b\u6e21\u3055\u308c\u3066\u304a\u308a\u3001\u305d\u3053\u3067 <code>u.Name<\/code> \u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306b\u9006\u53c2\u7167\u304c\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u3002 \u3057\u305f\u304c\u3063\u3066\u3001<code>process<\/code> \u95a2\u6570\u306e <code>user<\/code> \u5909\u6570\u304c <code>nil<\/code> \u306e\u5834\u5408\u306b <code>nil<\/code> \u9006\u53c2\u7167\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u4f8b\u306f\u3001<code>nil<\/code> \u9006\u53c2\u7167\u306e\u554f\u984c\u304c\u5f80\u3005\u306b\u3057\u3066\u6349\u3048\u306b\u304f\u304f\u3001\u898b\u9003\u3057\u3084\u3059\u3044\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002 \u30b3\u30fc\u30c9\u304c\u30af\u30ea\u30fc\u30f3\u3067 Go \u3089\u3057\u3044\u66f8\u304d\u65b9\u306b\u898b\u3048\u305f\u3068\u3057\u3066\u3082\u3001\u3061\u3087\u3063\u3068\u3057\u305f\u601d\u3044\u8fbc\u307f\u304c\u539f\u56e0\u3067\u5b9f\u884c\u6642\u306b\u30af\u30e9\u30c3\u30b7\u30e5\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002 \u624b\u4f5c\u696d\u3067\u306e\u539f\u56e0\u8ffd\u53ca\u306f\u9a5a\u304f\u307b\u3069\u9762\u5012\u3067\u3059\u3002<code>nil<\/code> \u5024\u306e\u767a\u751f\u7b87\u6240\u304c\u4f7f\u7528\u3055\u308c\u308b\u5834\u6240\u304b\u3089\u9060\u304f\u3001\u8907\u6570\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u3001\u307e\u305f\u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3088\u308b\u9006\u53c2\u7167\u304b\u3089\u96e2\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u306a\u304a\u3055\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u3053\u3067\u5f79\u7acb\u3064\u306e\u304c\u3001\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u89e3\u6790\u3067\u3059\u3002 <code>nil<\/code> \u5024\u304c\u8907\u6570\u306e\u95a2\u6570\u547c\u3073\u51fa\u3057\u3092\u3069\u306e\u3088\u3046\u306b\u79fb\u52d5\u3059\u308b\u306e\u304b\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002 \u554f\u984c\u304c\u59cb\u307e\u308b\u5834\u6240\u3092\u63a8\u6e2c\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u9006\u53c2\u7167\u306e\u6e90\u304b\u3089\u767a\u751f\u7b87\u6240\u307e\u3067\u306e\u7d4c\u8def\u5168\u4f53\u3092\u660e\u78ba\u306b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30af\u30a4\u30c3\u30af\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b nil \u8a31\u5bb9\u6027\u60c5\u5831\u304c\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f<\/h2>\n\n\n\n<p>GoLand \u306e nil \u8a31\u5bb9\u6027\u89e3\u6790\u306f\u3001\u30a8\u30c7\u30a3\u30bf\u30fc\u5185\u3067\u554f\u984c\u3092\u30cf\u30a4\u30e9\u30a4\u30c8\u3059\u308b\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u3059\u3067\u306b\u78ba\u8a8d\u3057\u305f\u3088\u3046\u306b\u3001\u3053\u306e\u89e3\u6790\u306f\u95a2\u6570\u304c <code>nil<\/code> \u3092\u8fd4\u3059\u304b\u3069\u3046\u304b\u3001\u7279\u5b9a\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306b <code>nil<\/code> \u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3066\u3082\u5b89\u5168\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u3053\u306e\u89e3\u6790\u306f\u95a2\u6570\u306b\u671f\u5f85\u3055\u308c\u308b\u52d5\u4f5c\u3092\u7406\u89e3\u3067\u304d\u308b\u305f\u3081\u3001\u3053\u306e\u60c5\u5831\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3084\u3059\u304f\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002 nil \u8a31\u5bb9\u6027\u60c5\u5831\u3092 <strong>Quick Documentation<\/strong>\uff08\u30af\u30a4\u30c3\u30af\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff09\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306b\u76f4\u63a5\u7d44\u307f\u8fbc\u3093\u3060\u306e\u306f\u305d\u306e\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3067\u306f\u3001\u4fee\u6b63\u3092\u9069\u7528\u3059\u308b\u524d\u306e\u6700\u521d\u306e\u4f8b\u306b\u623b\u308a\u307e\u3057\u3087\u3046\u3002 <code>NewUser<\/code> \u95a2\u6570\u306b\u30ad\u30e3\u30ec\u30c3\u30c8\u3092\u7f6e\u3044\u3066 <em>Quick Documentation<\/em>\uff08\u30af\u30a4\u30c3\u30af\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff09\u3092\u547c\u3073\u51fa\u3059\u3068\u3001<em>Nilability info<\/em>\uff08nil \u8a31\u5bb9\u6027\u60c5\u5831\uff09\u3068\u3044\u3046\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002 \u95a2\u6570\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306e nil \u8a31\u5bb9\u6027\u3068 <code>return<\/code> \u5024\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002 \u3053\u306e\u4f8b\u306e\u95a2\u6570\u306f <code>nil<\/code> \u306e\u7d50\u679c\u3092\u8fd4\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001Quick Documentation\uff08\u30af\u30a4\u30c3\u30af\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff09\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306b\u305d\u306e\u3053\u3068\u304c\u660e\u78ba\u306b\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"962\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-3.1-quick-documentation-NewUser.png\" alt=\"\" class=\"wp-image-583567\"\/><\/figure>\n\n\n\n<p>\u3053\u306e\u6a5f\u80fd\u306f\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3068\u30ec\u30b7\u30fc\u30d0\u30fc\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002 2 \u3064\u76ee\u306e\u4f8b\u3082\u4fee\u6b63\u3092\u9069\u7528\u3059\u308b\u524d\u306e\u3082\u306e\u3067\u3001<em>Nilability info<\/em>\uff08nil \u8a31\u5bb9\u6027\u60c5\u5831\uff09\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u95a2\u6570\u306e\u30ec\u30b7\u30fc\u30d0\u30fc <code>u<\/code> \u3068\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc <code>ctx<\/code> \u306b\u975e nil \u5024\u304c\u5fc5\u8981\u3067\u3042\u308b\u3053\u3068\u304c\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-11 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"3206\" height=\"1346\" data-id=\"583578\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Example-3.2-quick-documentation-Copy.png\" alt=\"\" class=\"wp-image-583578\"\/><\/figure>\n<\/figure>\n\n\n\n<p>\u3053\u306e\u5c0f\u3055\u306a\u8ffd\u52a0\u6a5f\u80fd\u306b\u3088\u308a\u3001\u5927\u304d\u306a\u9055\u3044\u304c\u751f\u307e\u308c\u307e\u3059\u3002 \u30af\u30a4\u30c3\u30af\u691c\u7d22\u3067\u306f\u3001\u91cd\u8981\u306a\u8a73\u7d30\u306e\u6982\u8981\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u3088\u308a\u5b89\u5168\u306a\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3057\u3001\u4e88\u671f\u3057\u306a\u3044 <code>nil<\/code> \u9006\u53c2\u7167\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u3092\u6e1b\u3089\u3059\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 \u305f\u3060\u3057\u3001\u89e3\u6790\u306f\u3042\u3089\u3086\u308b\u30b1\u30fc\u30b9\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5e38\u306b\u30b3\u30fc\u30c9\u3092\u5165\u5ff5\u306b\u30ec\u30d3\u30e5\u30fc\u3059\u308b\u3053\u3068\u3092\u5fc3\u304c\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5236\u9650\u3068\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5<\/h2>\n\n\n\n<p>\u3053\u306e\u89e3\u6790\u306e\u6700\u521d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u610f\u56f3\u7684\u306b\u5358\u7d14\u304b\u3064\u614e\u91cd\u306b\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002 \u3059\u3079\u3066\u306e\u6f5c\u5728\u7684\u306a <code>nil<\/code> \u9006\u53c2\u7167\u306e\u691c\u51fa\u3092\u8a66\u307f\u308b\u3082\u306e\u3067\u306f\u306a\u304f\u3001\u610f\u56f3\u7684\u306b\u305d\u306e\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002 \u6700\u3082\u3088\u304f\u3042\u308b\u91cd\u8981\u306a\u30b1\u30fc\u30b9\u306b\u7684\u3092\u7d5e\u308a\u3001\u8aa4\u691c\u51fa\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u3092\u76ee\u6307\u3057\u307e\u3057\u305f\u3002 \u3053\u306e\u89e3\u6790\u306f\u6642\u9593\u3092\u304b\u3051\u3066\u7d99\u7d9a\u7684\u306b\u6539\u5584\u3055\u308c\u3001\u65b0\u3057\u3044\u30b1\u30fc\u30b9\u304c\u614e\u91cd\u306b\u8ffd\u52a0\u3055\u308c\u308b\u4e88\u5b9a\u3067\u3059\u3002 \u4e0d\u8981\u306a\u3082\u306e\u3092\u8ffd\u52a0\u305b\u305a\u3001\u3088\u308a\u591a\u304f\u306e\u554f\u984c\u3092\u691c\u51fa\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3092\u76ee\u6a19\u3068\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d1\u30cb\u30c3\u30af\u3092\u56de\u907f\u3057\u3001\u5b89\u5168\u6027\u3092\u5f37\u5316<\/h2>\n\n\n\n<p>\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3\u9593\u30b3\u30fc\u30c9\u89e3\u6790\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001<code>nil<\/code> \u30dd\u30a4\u30f3\u30bf\u30fc\u306e\u9006\u53c2\u7167\u306e\u554f\u984c\u3092\u65e9\u671f\u306b\u691c\u51fa\u3057\u3066\u4fee\u6b63\u3059\u308b\u306e\u304c\u306f\u308b\u304b\u306b\u7c21\u5358\u306b\u306a\u308a\u307e\u3059\u3002 \u3053\u306e\u89e3\u6790\u306f\u3001\u95a2\u6570\u3001\u30d5\u30a1\u30a4\u30eb\u3001\u304a\u3088\u3073\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u6a2a\u65ad\u3057\u3066 <code>nil<\/code> \u5024\u3092\u8ffd\u8de1\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u6f5c\u5728\u7684\u306a\u30d0\u30b0\u304c\u672c\u756a\u74b0\u5883\u306b\u5230\u9054\u3059\u308b\u524d\u306b\u305d\u306e\u539f\u56e0\u3092\u3088\u308a\u5bb9\u6613\u306b\u628a\u63e1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u8efd\u6e1b\u3057\u3001\u30b3\u30b9\u30c8\u306e\u304b\u304b\u308b\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u3092\u56de\u907f\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002&nbsp;<\/p>\n\n\n\n<p>\u4eca\u5f8c\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u3092\u6539\u826f\u3057\u3001\u62e1\u5f35\u3057\u7d9a\u3051\u3066\u3044\u304f\u4e88\u5b9a\u3067\u3059\u3002 \u4eca\u5f8c\u306e\u60c5\u5831\u306b\u3054\u671f\u5f85\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001\u3044\u3064\u3082\u306e\u3088\u3046\u306b\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u304a\u5f85\u3061\u3057\u3066\u304a\u308a\u307e\u3059\uff01<\/p>\n\n\n\n<p><em>GoLand \u30c1\u30fc\u30e0\u4e00\u540c<\/em><\/p>\n\n\n\n<p><strong>\u30aa\u30ea\u30b8\u30ca\u30eb\uff08\u82f1\u8a9e\uff09\u30d6\u30ed\u30b0\u6295\u7a3f\u8a18\u4e8b\u306e\u4f5c\u8005\uff1a<\/strong><\/p>\n\n\n    <div class=\"about-author \">\n        <div class=\"about-author__box\">\n            <div class=\"row\">\n                <div class=\"about-author__box-img\">\n                    <img decoding=\"async\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2025\/07\/Me.png\" width=\"200\" height=\"200\" alt=\"Arseniy Terekhov\" loading=\"lazy\"  class=\"avatar avatar-200 wp-user-avatar wp-user-avatar-200 photo avatar-default\">\n                <\/div>\n                <div class=\"about-author__box-text\">\n                                            <h4>Arseniy Terekhov<\/h4>\n                                                        <\/div>\n            <\/div>\n        <\/div>\n    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