{"width":"100%","type":"rich","author_url":"https://blog.hatena.ne.jp/syu-m-5151/","author_name":"syu-m-5151","version":"1.0","url":"https://syu-m-5151.hatenablog.com/entry/2026/05/02/120443","title":"`let-else` \u3067\u65e9\u671f return \u3092\u7d20\u76f4\u306b\u66f8\u304f","provider_name":"Hatena Blog","blog_title":"\u3058\u3083\u3042\u3001\u304a\u3046\u3061\u3067\u5b66\u3079\u308b ","published":"2026-05-02 12:04:43","height":"190","image_url":null,"blog_url":"https://syu-m-5151.hatenablog.com/","description":"\u306f\u3058\u3081\u306b Rust \u306e let-else \u69cb\u6587\u306f\u3001Rust 1.65 (2022\u5e74) \u3067\u5b89\u5b9a\u5316\u3055\u308c\u305f\u6a5f\u80fd\u3067\u3059\u3002\u53e4\u304f\u304b\u3089\u3042\u308b\u6a5f\u80fd\u3067\u3059\u304c\u30012024 edition \u306e\u30af\u30ea\u30fc\u30f3\u306a\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3067\u306f\u591a\u7528\u3055\u308c\u307e\u3059\u3002clippy \u306e manual_let_else \u30eb\u30fc\u30eb\u3082 2024 \u3067\u306f\u4f7f\u3046\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002 \u300cOption \u304c None \u3060\u3063\u305f\u3089\u95a2\u6570\u3092\u629c\u3051\u308b\u300d\u300cResult \u304c Err \u3060\u3063\u305f\u3089\u30a8\u30e9\u30fc\u3067\u65e9\u671f return \u3059\u308b\u300d\u3068\u3044\u3046\u30d1\u30bf\u30fc\u30f3\u3092\u3001\u30cd\u30b9\u30c8\u305b\u305a\u66f8\u3051\u308b\u69cb\u6587\u3067\u3059\u3002 \u4f55\u3092\u89e3\u6c7a\u3059\u308b\u304b Option<T> \u304b\u3089 T \u3092\u53d6\u308a\u51fa\u3057\u3066\u51e6\u7406\u3092\u7d9a\u3051\u305f\u3044\u3001\u3068\u3044\u3046\u5834\u9762\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u7d20\u76f4\u306b\u66f8\u304f\u3068\u3053\u3046\u306a\u308a\u307e\u3059\u3002\u2026","categories":["Rust"],"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsyu-m-5151.hatenablog.com%2Fentry%2F2026%2F05%2F02%2F120443\" title=\"`let-else` \u3067\u65e9\u671f return \u3092\u7d20\u76f4\u306b\u66f8\u304f - \u3058\u3083\u3042\u3001\u304a\u3046\u3061\u3067\u5b66\u3079\u308b \" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","provider_url":"https://hatena.blog"}