2020\u5e747\u670816\u65e5\u306bRust 1.45.0\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\u3002\u9014\u4e2d\u306b\u30d1\u30c3\u30c1\u30ea\u30ea\u30fc\u30b9\u306e1.44.1\u304c\u631f\u307e\u308a\u307e\u3057\u305f\u304c\u3001\u3060\u3044\u305f\u30446\u9031\u9593\u3054\u3068\u306e\u30ea\u30ea\u30fc\u30b9\u30b5\u30a4\u30af\u30eb\u304c\u5b88\u3089\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306fAnnouncing Rust 1.45.0\u306e\u5185\u5bb9\u3092\u57fa\u306b1.45.0\u306e\u65b0\u6a5f\u80fd\u3092\u78ba\u8a8d\u3057\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u306a\u304a\u3001Rust\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3084\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u3057\u3066\u304f\u308c\u308b Rustup\u30827\u67088\u65e5\u306b1.22.1\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u5408\u308f\u305b\u3066\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3059\u308b\u3068\u826f\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u3067\u30b5\u30af\u30c3\u3068\u4e0a\u304c\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
$ <\/span>rustup self update\r\n<\/code><\/pre>\n\u305d\u306e\u3046\u3048\u3067\u3001<\/p>\n
$ <\/span>rustup update stable\r\n<\/code><\/pre>\n\u3059\u308c\u3070 1.45.0\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u65b0\u6a5f\u80fd<\/h2>\n\u578b\u5909\u63db\u306e\u554f\u984c\u306e\u4fee\u6b63<\/h3>\n
\u3053\u308c\u306f\u65b0\u6a5f\u80fd\u3068\u3044\u3046\u3088\u308a\u554f\u984c\u306e\u4fee\u6b63\u3067\u3059\u304c\u3001\u4ee5\u524d\u306eRust\u3060\u3068Cast\u3059\u308b\u969b\u306b\u5024\u306e\u7bc4\u56f2\u3092\u8d8a\u3048\u308b\u3068\u672a\u5b9a\u7fa9\u306e\u52d5\u4f5c\u306b\u306a\u308b\uff08\u3064\u307e\u308a\u3069\u3046\u306a\u308b\u304b\u308f\u304b\u3089\u306a\u3044\uff09\u3068\u3044\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u95a2\u6570\u3092\u8003\u3048\u307e\u3059\u3002\u3053\u308c\u306f32\u30d3\u30c3\u30c8\u6d6e\u52d5\u5c0f\u6570\u70b9\u578b\u306e\u5024\u30928\u30d3\u30c3\u30c8\u306e\u7b26\u53f7\u306a\u3057\u6574\u6570\u578b\u306b\u5909\u63db\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
pub<\/span> fn<\/span> cast<\/span>(<\/span>x<\/span>:<\/span> f32<\/span>)<\/span> -><\/span> u8<\/span> {<\/span>\r\n x<\/span> as<\/span> u8<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u51fa\u529b\u304c8\u30d3\u30c3\u30c8\u306e\u7b26\u53f7\u306a\u3057\u6574\u6570\u578b\u306a\u306e\u3067\u53d6\u308a\u3046\u308b\u5024\u306f0\u304b\u3089255\u307e\u3067\u3067\u3001\u305d\u308c\u3092\u305d\u308c\u3092\u8d8a\u3048\u308b\u3068\u4f55\u304c\u304a\u3053\u308b\u304b\u308f\u304b\u3089\u306a\u3044 \u3053\u308c\u306fRust\u306e\u30b3\u30f3\u30d1\u30a4\u30e9\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3067\u4f7f\u3063\u3066\u3044\u308b LLVM\u304c\u305d\u3046\u3044\u3046\u30b3\u30fc\u30c9\u3092\u51fa\u529b\u3059\u308b\u304b\u3089\u3067\u3059\u304c\u3001\u3088\u308d\u3057\u304f\u306a\u3044\u3067\u3059\u3088\u306d\u3002\u3053\u306e\u554f\u984c\u81ea\u4f53\u306fRust\u304c1.0\u306b\u306a\u308b\u3060\u3044\u3076\u524d\u306e2013\u5e74\u304b\u3089\u3042\u3063\u3066\uff087\u5e74\u524d\uff01)\u3001\u3067\u3082\u3053\u3053\u307e\u3067\u89e3\u6c7a\u3055\u308c\u305a\u306b\u6b8b\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n
\u4e0a\u8a18\u306e\u95a2\u6570\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002300.0 \u306f\u8a31\u5bb9\u7bc4\u56f2\u306e 255 \u3092\u8d8a\u3048\u3066\u3044\u308b\u306e\u3067x\u306b\u4f55\u304c\u5165\u308b\u304b\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u79c1\u306e\u5834\u5408\u306f x: 44\u304c\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u304c\u3001\u4eba\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u5024\u304c\u8868\u793a\u3055\u308c\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n let<\/span> f<\/span> =<\/span> 300.0<\/span>;<\/span>\r\n let<\/span> x<\/span> =<\/span> cast<\/span>(<\/span>f<\/span>);<\/span>\r\n println!<\/span>(<\/span>\"x: {}\"<\/span>,<\/span> x<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30a8\u30e9\u30fc\u306b\u306a\u3089\u305a\u3001\u5b9f\u884c\u6642\u306b\u3082\u3053\u308c\u304c\u8d77\u304d\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u3089\u306a\u3044\u3002\u5384\u4ecb\u3067\u3059\u306d\u3002\u3053\u3046\u3044\u3046\u306e\u304c\u30b9\u30eb\u30fc\u3055\u308c\u308b\u306e\u306fRust\u3063\u307d\u304f\u306a\u3044\u3067\u3059\u3002<\/p>\n
\u3067\u3001\u3053\u306e\u30d0\u30b0\u306b\u306f\u300ccast soundness\u300d\u30d0\u30b0\u3068\u3044\u3046\u540d\u524d\u304c\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u300c\u578b\u5909\u63db\u306e\u4e0d\u5065\u5168\u300d\u30d0\u30b0\u3068\u3044\u3046\u611f\u3058\u3067\u3057\u3087\u3046\u304b\u3002\u540d\u524d\u3092\u3064\u3051\u3089\u308c\u3066\u3044\u3064\u304b\u76f4\u3059\u3082\u306e\u3068\u3057\u3066\u8ffd\u3044\u304b\u3051\u3089\u308c\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u3069\u3046\u76f4\u3059\u306e\u304c\u826f\u3044\u304b\u304c\u660e\u78ba\u3067\u306f\u306a\u304b\u3063\u305f\u306e\u3067\u4fee\u6b63\u306b\u306f\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n
\u6700\u7d42\u7684\u306b\u4ee5\u4e0b\u306e\u7d50\u8ad6\u306b\u81f3\u308a\u3001\u4eca\u56de\u306e1.45.0\u3067\u4fee\u6b63\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
as\u306f saturation cast (\u98fd\u548c\u578b\u5909\u63db)\u3092\u884c\u3046<\/p>\n
\u578b\u5909\u63db\u5148\u306e\u5024\u306e\u7bc4\u56f2\u3092\u8d85\u3048\u308b\u5834\u5408\u306b\u306f\u305d\u306e\u6700\u5927\u5024\u3042\u308b\u3044\u306f\u6700\u5c0f\u5024\u306b\u5909\u63db\u3059\u308b<\/p>\n
\u3053\u306e\u52d5\u4f5c\u3092\u3055\u305b\u305f\u304f\u306a\u3044\u6642\u306b\u306f unsafe\u578b\u5909\u63db\u3092\u4f7f\u3046<\/p>\n
\u3053\u308c\u306f\u914d\u5217\u3067array[i]\u3068\u3057\u305f\u5834\u5408\u306f\u914d\u5217\u304ci+1\u500b\u306e\u8981\u7d20\u3092\u6301\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001\u305d\u306e\u30c1\u30a7\u30c3\u30af\u3092\u5916\u3057\u305f\u3044\u6642\u306b\u306f unsafe\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u3046\u306e\u3068\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n
1.45.0\u3067\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u52d5\u4f5c\u304c\u308f\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> cast<\/span>(<\/span>300.0<\/span>));<\/span> \/\/ --> 255<\/span>\r\n println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> cast<\/span>(<\/span>-<\/span>100.0<\/span>));<\/span> \/\/ --> 0<\/span>\r\n println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> cast<\/span>(<\/span>f32<\/span>::<\/span>NAN<\/span>));<\/span> \/\/ --> 0<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u5024\u304c\u578b\u5909\u63db\u5148\u306e\u7bc4\u56f2\u306b\u5165\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u4f59\u8a08\u306a\u30c1\u30a7\u30c3\u30af\u3092\u3055\u305b\u305f\u304f\u306a\u3044\u5834\u5408\u306b\u306f unsafe\u3092\u3064\u304b\u3063\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n
let<\/span> x<\/span>:<\/span> f32<\/span> =<\/span> 1.0<\/span>;<\/span>\r\nlet<\/span> y<\/span>:<\/span> u8<\/span> =<\/span> unsafe<\/span> {<\/span> x<\/span>.to_int_unchecked<\/span>()<\/span> };<\/span>\r\n<\/code><\/pre>\n\u901f\u5ea6\u91cd\u8996\u306e\u5834\u5408\u306b\u306f\u3042\u308a\u304b\u3082\u77e5\u308c\u307e\u305b\u3093\u304c\u3001\u30b3\u30f3\u30d1\u30a4\u30e9\u304c\u3088\u308d\u3057\u304f\u3084\u3063\u3066\u304f\u308c\u308b\u5834\u5408\u3082\u3042\u308a\u3001\u3042\u307e\u308a\u30aa\u30b9\u30b9\u30e1\u3067\u306f\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n
\u95a2\u6570\u7684\u624b\u7d9a\u304d\u30de\u30af\u30ed\u306e\u5229\u7528\u53ef\u80fd\u5834\u6240\u304c\u5897\u3048\u308b<\/h3>\n
\u307e\u305a\u4eca\u56de\u306e\u5909\u66f4\u306e\u524d\u306b\u624b\u7d9a\u304d\u30de\u30af\u30ed\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u66f8\u3044\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n
Rust 1.30.0\u3067\u624b\u7d9a\u304d\u30de\u30af\u30ed\u304c\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001TokenStream \uff08Rust\u30b3\u30fc\u30c9\u306e\u65ad\u7247\uff09\u3092\u5165\u529b\u3068\u3057TokenStream\u3092\u51fa\u529b\u3068\u3059\u308b\u30de\u30af\u30ed\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u624b\u7d9a\u304d\u30de\u30af\u30ed\u3092\u8003\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n
use<\/span> proc_macro<\/span>::<\/span>TokenStream<\/span>;<\/span>\r\n\r\n#[proc_macro]<\/span>\r\npub<\/span> fn<\/span> make_func<\/span>(<\/span>item<\/span>:<\/span> TokenStream<\/span>)<\/span> -><\/span> TokenStream<\/span> {<\/span>\r\n format!<\/span>(<\/span>\"fn func() -> u32 {{ {} * 2 }}\"<\/span>,<\/span> item<\/span>)<\/span>\r\n .parse<\/span>()<\/span>\r\n .unwrap<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u3053\u308c\u306f func()\u3068\u3044\u3046\u95a2\u6570\u5b9a\u7fa9\u3092\u8fd4\u3059\u30de\u30af\u30ed\u3067\u3059\u304c\u3001item\u3067\u6307\u5b9a\u3057\u305f\u5f0f\u306b*2\u3057\u305f\u5024\u3092\u8fd4\u3059\u95a2\u6570\u3067\u3059\u3002<\/p>\n
\u4f7f\u3046\u5074\u3067\u306f<\/p>\n
use<\/span> func_proc_macros<\/span>::<\/span>make_func<\/span>;<\/span>\r\n\r\nmake_func!<\/span>(<\/span>1<\/span> +<\/span> 2<\/span>);<\/span>\r\n\r\nfn<\/span> main<\/span>()<\/span> {<\/span>\r\n println!<\/span>(<\/span>\"{}\"<\/span>,<\/span> func<\/span>());<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u3068\u3044\u3063\u305f\u5f62\u3067\u4f7f\u3048\u307e\u3059\u3002\u3053\u308c\u3092\u5b9f\u884c\u3059\u308b\u3068 5\u304c\u7d50\u679c\u3068\u3057\u3066\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u7406\u89e3\u3059\u308b\u306e\u306b\u30de\u30af\u30ed\u304c\u3069\u306e\u3088\u3046\u306b\u5c55\u958b\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n
$ <\/span>cargo install <\/span>cargo-expand\r\n$ <\/span>cargo expand<\/span>\r\n<\/code><\/pre>\n\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001make_func!(1 + 2)\u304c\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5c55\u958b\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n
fn<\/span> func<\/span>()<\/span> -><\/span> u32<\/span> {<\/span>\r\n 1<\/span> +<\/span> 2<\/span> *<\/span> 2<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u3053\u308c\u3092\u898b\u308b\u3068\u78ba\u304b\u306b\u8fd4\u308a\u5024\u306f5\u306b\u306a\u308a\u307e\u3059\u306d\u3002item * 2\u306a\u306e\u3067\u4e00\u77ac\u7b54\u3048\u306f 6\u304b\u306a\u3068\u601d\u3046\u306e\u3067\u3059\u304c\u3001\u5f0f\u3092\u6587\u5b57\u5217\u3067\u8cbc\u308a\u4ed8\u3051\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067 1 + 2 * 2\u3068\u306a\u308a\u3001\u639b\u3051\u7b97\u304c\u5148\u306b\u884c\u308f\u308c\u7b54\u3048\u306f 5\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u6a5f\u80fd\u306f\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u3089\u5229\u7528\u53ef\u80fd\u3067\u3057\u305f\u304c\u3001\u4f7f\u3048\u308b\u5834\u6240\u304c\u9650\u3089\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e item position \u3068\u3044\u3046\u3068\u3053\u308d\u306b\u3057\u304b\u7f6e\u3051\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3053\u308c\u304c\u3001Rust 1.45.0\u304b\u3089\u306f\u4ed6\u306e\u3068\u3053\u308d\u306b\u3082\u7f6e\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u5834\u6240\u304c\u65b0\u305f\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n
\n- \n
expression position: \u5f0f\u304c\u4f7f\u308f\u308c\u308b\u5834\u6240<\/ul>\n<\/li>\n<\/ul>\n <\/p>\n
\n- \n
pattern position: match\u3067\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u304c\u884c\u308f\u308c\u308b\u5834\u6240<\/ul>\n<\/li>\n<\/ul>\n <\/p>\n
statement position: \u6587\u304c\u4f7f\u308f\u308c\u308b\u5834\u6240<\/ul>\n
fn<\/span> main<\/span>()<\/span> {<\/span>\r\n let<\/span> expr<\/span> =<\/span> mac!<\/span>();<\/span> \/\/ expression position<\/span>\r\n\r\n match<\/span> expr<\/span> {<\/span>\r\n mac!<\/span>()<\/span> =><\/span> {}<\/span> \/\/ pattern position<\/span>\r\n }<\/span>\r\n\r\n mac!<\/span>();<\/span> \/\/ statement position<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n\u3053\u308c\u307e\u3067\u306f item position\u306b\u3057\u304b\u7f6e\u3051\u306a\u304b\u3063\u305f\u306e\u3067\u95a2\u6570\u5b9a\u7fa9\u306a\u3069\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306b\u7f6e\u3051\u308b\u3082\u306e\u3057\u304b\u30de\u30af\u30ed\u5316\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u3053\u308c\u304b\u3089\u306f\u5f0f\u3084\u6587\u306a\u3069\u3082\u624b\u7d9a\u304d\u30de\u30af\u30ed\u3092\u4f7f\u3063\u3066\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306b\u306a\u308a\u5fdc\u7528\u7bc4\u56f2\u304c\u3050\u3063\u3068\u5e83\u304c\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u306a\u304a\u3001\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u3063\u305f\u9762\u767d\u3044\u5b9f\u4f8b\u304cRust\u3067+++\u3092\u5b9f\u73fe\u3059\u308b\u306b\u8f09\u305b\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3054\u8208\u5473\u306e\u3042\u308b\u65b9\u306f\u305c\u3072\u305d\u3061\u3089\u3082\u3069\u3046\u305e\u3002<\/p>\n
char\u3092\u30ec\u30f3\u30b8\u3067\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308b<\/h3>\n
\u6587\u5b57\u578b\u3092\u30ec\u30f3\u30b8\u3067\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u3092\u5b9f\u884c\u3059\u308b\u3068abcdefghijklmnopqrstuvwxyz\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
for<\/span> ch<\/span> in<\/span> 'a'<\/span>..=<\/span>'z'<\/span> {<\/span>\r\n print!<\/span>(<\/span>\"{}\"<\/span>,<\/span> ch<\/span>);<\/span>\r\n}<\/span>\r\nprintln!<\/span>();<\/span>\r\n<\/code><\/pre>\n\u307e\u3068\u3081<\/h2>\n
Rust 1.45.0\u306e\u65b0\u6a5f\u80fd\u3092\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u305f\u3002Python\u306f1\u5e74\u306b\u4e00\u5ea6\u306e\u30ea\u30ea\u30fc\u30b9\uff08\u305d\u308c\u3067\u3082\u77ed\u304f\u306a\u3063\u305f\uff09\u3067\u3059\u304c\u3001\u305d\u308c\u306b\u6bd4\u3079\u308b\u30686\u9031\u9593\u306b\u4e00\u5ea6\u3068\u3044\u3046\u306e\u306f\u968f\u5206\u3068\u77ed\u304f\u305d\u306e\u5206\u5909\u66f4\u70b9\u3082\u30b3\u30f3\u30d1\u30af\u30c8\u306b\u306a\u308a\u307e\u3059\u306d\u3002\u3053\u308c\u304b\u3089\u3082\u6c17\u306b\u306a\u308b\u65b0\u6a5f\u80fd\u304c\u51fa\u3066\u304d\u305f\u3089\u66f8\u3044\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u306f\u3058\u3081\u306b 2020\u5e747\u670816\u65e5\u306bRust 1.45.0\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\u3002\u9014\u4e2d\u306b\u30d1\u30c3\u30c1\u30ea\u30ea\u30fc\u30b9\u306e1.44.1 […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45757","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n
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