{"provider_name":"Hatena Blog","author_name":"syu-m-5151","url":"https://syu-m-5151.hatenablog.com/entry/2026/05/03/152036","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fsyu-m-5151.hatenablog.com%2Fentry%2F2026%2F05%2F03%2F152036\" title=\"`if let` chain \u2014 Rust 1.88 / 2024 edition \u3067\u5b9f\u7528\u30d5\u30a7\u30fc\u30ba\u306b\u5165\u3063\u305f - \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>","image_url":null,"version":"1.0","blog_title":"\u3058\u3083\u3042\u3001\u304a\u3046\u3061\u3067\u5b66\u3079\u308b ","title":"`if let` chain \u2014 Rust 1.88 / 2024 edition \u3067\u5b9f\u7528\u30d5\u30a7\u30fc\u30ba\u306b\u5165\u3063\u305f","categories":["Rust"],"height":"190","author_url":"https://blog.hatena.ne.jp/syu-m-5151/","published":"2026-05-03 15:20:36","width":"100%","description":"\u306f\u3058\u3081\u306b Rust 1.88 (2025\u5e74) \u3067 if let chain \u304c\u5b89\u5b9a\u5316\u3055\u308c\u307e\u3057\u305f\u30022024 edition \u306e\u30b3\u30fc\u30c9\u3067\u306f\u7a4d\u6975\u7684\u306b\u4f7f\u3048\u307e\u3059\u3002 && \u3067 if let \u6761\u4ef6\u3092\u9023\u7d50\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u30cd\u30b9\u30c8\u3057\u305f if let \u3092\u5e73\u3089\u306b\u66f8\u3051\u308b\u69cb\u6587\u3067\u3059\u3002\u77ed\u3044\u5909\u66f4\u3067\u3059\u304c\u3001\u52b9\u679c\u306f\u5927\u304d\u304f\u51fa\u307e\u3059\u3002 \u4f55\u3092\u89e3\u6c7a\u3059\u308b\u304b Option \u304c\u8907\u6570\u3042\u3063\u3066\u3001\u3059\u3079\u3066 Some \u3060\u3063\u305f\u3068\u304d\u3060\u3051\u4f55\u304b\u3057\u305f\u3044\u3001\u3068\u3044\u3046\u5834\u9762\u3002\u7d20\u76f4\u306b\u66f8\u304f\u3068\u30cd\u30b9\u30c8\u306b\u306a\u308a\u307e\u3059\u3002 fn first_premium(items: &[String]) -> Option<&str> { if let Some(first) = items.first()\u2026","type":"rich","provider_url":"https://hatena.blog","blog_url":"https://syu-m-5151.hatenablog.com/"}