{"id":4281,"date":"2026-06-17T07:00:00","date_gmt":"2026-06-16T22:00:00","guid":{"rendered":"https:\/\/litcoder.com\/?p=4281"},"modified":"2026-05-24T12:48:17","modified_gmt":"2026-05-24T03:48:17","slug":"rust-comparison-is-useless-due-to-type-limits","status":"publish","type":"post","link":"https:\/\/litcoder.com\/?p=4281","title":{"rendered":"Rust: comparison is useless due to type limits"},"content":{"rendered":"\n<p class=\"has-text-align-center wp-block-paragraph\">&#8220;<em>\ud0c0\uc785 \uc81c\ud55c \ub54c\ubb38\uc5d0 \uc774 \ube44\uad50\uc5f0\uc0b0\uc740 \uc4f8.\ubaa8.\uc5c6.\ub2e4.<\/em>&#8220;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IndexSet\uc774 \ud558\ub098 \uc788\ub2e4\uace0 \ud560 \ub54c, \uadf8 \uc548\uc5d0 \ud558\ub098\ub77c\ub3c4 \uc544\uc774\ud15c\uc774 \uc788\uc73c\uba74 true\ub97c \ubc18\ud658\ud558\uace0 \uc544\ub2c8\uba74 false\ub97c \ubc18\ud658\ud558\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 Rust code\ub97c \uc0dd\uac01\ud574 \ubcf4\uc790.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"enlighter\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"true\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">use indexmap::IndexSet;\n\nfn has_item(item_set: &amp;IndexSet&lt;String>) -> bool {\n    item_set.iter().count() >= 0\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\uac04\ub2e8\ud558\uac8c unittest\uc5d0 \ub123\uc5b4\uc11c \uc0c8\ub85c \uc0dd\uc131\ud574\uc11c \uc544\ubb34 \uc6d0\uc18c\ub3c4 \uc5c6\ub294 IndexSet\uc744 \ud558\ub098 \ub9cc\ub4e4\uc5b4\uc11c \ud655\uc778\ud558\ub294 test\ub97c \ub3cc\ub824\ubcf4\uba74<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"enlighter\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"true\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#[cfg(test)]\nmod iset_test {\n    use super::*;\n\n    #[test]\n    fn test_item_exist() {\n        let idxset = IndexSet::&lt;String>::new();\n\n        \/\/ IndexSet \uc0dd\uc131\uc9c1\ud6c4\uc5d0\ub294 \uc544\uc774\ud15c\uc774 \uc5c6\uc5b4\uc57c \ud568.\n        assert_eq!(false, has_item(&amp;idxset));\n    }\n}\n<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ud14c\uc2a4\ud2b8\uc5d0 \uc2e4\ud328 \ud558\ub294\ub370 \uc774\uc640 \ud568\uaed8 <strong>&#8220;comparison is useless due to type limits&#8221;<\/strong>\uc774\ub77c\ub294 \uacbd\uace0\uac00 \ucd9c\ub825\ub41c\ub2e4.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"494\" height=\"245\" src=\"https:\/\/litcoder.com\/wp-content\/uploads\/2026\/05\/rust_unused_comparisons.png\" alt=\"\" class=\"wp-image-4390\" style=\"width:500px\" srcset=\"https:\/\/litcoder.com\/wp-content\/uploads\/2026\/05\/rust_unused_comparisons.png 494w, https:\/\/litcoder.com\/wp-content\/uploads\/2026\/05\/rust_unused_comparisons-300x149.png 300w\" sizes=\"auto, (max-width: 494px) 100vw, 494px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\uc774\uac83\uc740 <code>count()<\/code>\uac00 <code>usize<\/code> type\uc744 \ubc18\ud658\ud558\ub294\ub370 \ubd80\ud638 \uc5c6\ub294 \ud06c\uae30\ub97c \ub098\ud0c0\ub0b4\ub294 \uc774 \uac12\uc774 \uc74c\uc218 \uc77c \uc218\ub294 \uc5c6\uace0 \ud45c\ud604\ud560 \uc218 \uc788\ub294 \uac00\uc7a5 \uc791\uc740 \uc218\uac00 0\uc774\uae30 \ub54c\ubb38\uc5d0, 0\ubcf4\ub2e4 \uac19\uac70\ub098 \ud070\uc9c0 \ube44\uad50\ud558\ub294 \uad6c\ubb38\uc740 \ubb54\uac00 \uc798\ubabb\ub41c\uac8c \uc544\ub2c8\ub0d0\ub294 \uacbd\uace0\uc774\ub2e4.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud574\uacb0(?)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\uc0ac\uc2e4 \uc774 \ucf54\ub4dc\ub294 \ucc98\uc74c\ubd80\ud130 \uc798\ubabb \ub418\uc5c8\ub2e4. \uc544\uc774\ud15c\uc758 \uac2f\uc218\uac00 0\uac1c\uc778 \uacbd\uc6b0\ub3c4 \uc544\uc774\ud15c\uc774 \uc788\ub2e4\uace0 \ud310\ub2e8\ud558\ub294 \uac83\uc774\ub2c8\uae4c \ub9d0\uc774\ub2e4. \uc774 \uacbd\uace0\ub294 <code>count() &gt; 0<\/code>\uc73c\ub85c \ucf54\ub4dc\ub97c \ubcc0\uacbd\ud558\uac70\ub098 <code>is_empty()<\/code>\ub97c \ud1b5\ud574\uc11c \ubcf4\ub2e4 \uba85\uc2dc\uc801\uc73c\ub85c \uad6c\ud604\ud574\uc57c \ud55c\ub2e4. <\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"rust\" data-enlighter-theme=\"enlighter\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"true\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">fn has_item(item_set: &amp;IndexSet&lt;String>) -> bool {\n    \/\/item_set.iter().count() > 0\n    !item_set.is_empty()\n}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\ub2e4\ub978 \uc5b8\uc5b4\uc758 \ucef4\ud30c\uc77c\ub7ec\ub4e4 \ucc98\ub7fc \ud0c0\uc785\uc774 \ub2e4\ub974\ub2e4\ub294 \uacbd\uace0\uc600\ub2e4\uac70\ub098 \uc870\uc6a9\ud588\ub2e4\uba74 \uadf8\ub0e5 \ubb34\uc2dc\ud558\uace0 \ub7f0\ud0c0\uc784 \ubc84\uadf8\ub85c \ub0a8\uc744 \uc218\ub3c4 \uc788\uc5c8\ub294\ub370, \uacbd\uace0 \ubb38\uad6c\uac00 \uc6cc\ub099 \uac15\ub825\ud558\ub2e4 \ubcf4\ub2c8 \ub355\ubd84\uc5d0 \ubbf8\ub9ac \ub514\ubc84\uae45\uc744 \ud560 \uc218 \uc788\ub294 \ubd80\uc218\ud6a8\uacfc\uc600\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;\ud0c0\uc785 \uc81c\ud55c \ub54c\ubb38\uc5d0 \uc774 \ube44\uad50\uc5f0\uc0b0\uc740 \uc4f8.\ubaa8.\uc5c6.\ub2e4.&#8220; IndexSet\uc774 \ud558\ub098 \uc788\ub2e4\uace0 \ud560 \ub54c, \uadf8 \uc548\uc5d0 \ud558\ub098\ub77c\ub3c4 \uc544\uc774\ud15c\uc774 \uc788\uc73c\uba74 true\ub97c \ubc18\ud658\ud558\uace0 \uc544\ub2c8\uba74 false\ub97c \ubc18\ud658\ud558\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 Rust code\ub97c \uc0dd\uac01\ud574 \ubcf4\uc790. \uac04\ub2e8\ud558\uac8c unittest\uc5d0 \ub123\uc5b4\uc11c \uc0c8\ub85c \uc0dd\uc131\ud574\uc11c \uc544\ubb34 \uc6d0\uc18c\ub3c4 \uc5c6\ub294 IndexSet\uc744 \ud558\ub098 \ub9cc\ub4e4\uc5b4\uc11c \ud655\uc778\ud558\ub294 test\ub97c \ub3cc\ub824\ubcf4\uba74 \ud14c\uc2a4\ud2b8\uc5d0 \uc2e4\ud328 \ud558\ub294\ub370 \uc774\uc640 \ud568\uaed8 &#8220;comparison is useless due to type limits&#8221;\uc774\ub77c\ub294 \uacbd\uace0\uac00 \ucd9c\ub825\ub41c\ub2e4. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[5],"tags":[444,423],"class_list":["post-4281","post","type-post","status-publish","format-standard","hentry","category-programming","tag-indexset","tag-rust"],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":3939,"url":"https:\/\/litcoder.com\/?p=3939","url_meta":{"origin":4281,"position":0},"title":"gRPC Streaming\uc73c\ub85c \uc0c1\ud0dc \uc804\uc1a1 \ubc1b\uae30 \uc608\uc81c","author":"litcoder","date":"2026\ub144 7\uc6d4 29\uc77c","format":false,"excerpt":"gRPC\uc5d0\uc11c Observer pattern\uc744 \uad6c\ud604\ud558\ub294 \uc608\uc81c\ub97c \uace0\ubbfc\ud588\ub358 \uc801\uc774 \uc788\uc5c8\ub294\ub370(gRPC\ub97c \uc774\uc6a9\ud55c Observer Pattern) \uc54c\uace0\ubcf4\ub2c8 gRPC\uc5d0\uc11c\ub294 ReadReactor \/ WriteReactor \ubcf4\ub2e4 \uac04\ub2e8\ud558\uac8c object\uc758 \uc0c1\ud0dc \ubcc0\uacbd\uc744 \uac10\uc9c0\ud560 \uc218 \uc788\ub294 \uba54\ucee4\ub2c8\uc998\uc744 \uc81c\uacf5\ud558\uace0 \uc788\uc5c8\ub2e4. gRPC\ub97c \uc774\uc6a9\ud55c Observer pattern \uad6c\ud604 \uc608\uc81c\ub97c \ucc3e\uae30 \uc5b4\ub824\uc6e0\ub358 \uc774\uc720\uac00 \uc5b4\uca4c\uba74 \uadf8\ub7f0 \ubcf5\uc7a1\ud55c \ud328\ud134 \uc5c6\uc774\ub3c4 \uad6c\ud604\uc774 \uac00\ub2a5\ud558\uae30 \ub54c\ubb38\uc774\uc5c8\ub294\uc9c0\ub3c4 \ubaa8\ub974\uaca0\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 Stream\uc744 \ud1b5\ud574 \ubcc0\uacbd\ub418\ub294\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/07\/Screenshot-2026-07-10-at-6.34.33-PM.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":4520,"url":"https:\/\/litcoder.com\/?p=4520","url_meta":{"origin":4281,"position":1},"title":"Rust \ud504\ub85c\uadf8\ub798\ubc0d, \ucf54\ub4dc \uac00\ub3c5\uc131\uc744 \ub192\uc774\uae30 \uc704\ud55c and_then() \ud65c\uc6a9","author":"litcoder","date":"2026\ub144 6\uc6d4 24\uc77c","format":false,"excerpt":"Rust\ub294 \uc120\uc5b8\uc801 \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \uc801\uadf9\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\uae30\uc5d0 method chaining\uc744 \ub9ce\uc774 \uc0ac\uc6a9\ud558\ub294\ub370 \uc774\ub294 \uac00\ub3c5\uc131\uc744 \ub192\uc774\uace0 \ucef4\ud30c\uc77c\ub7ec\uac00 \ucd5c\uc801\ud654\ub97c \uc218\ud589\ud558\ub294\ub370 \uc801\ud569\ud55c \ud615\ud0dc\uc774\uae30 \ub54c\ubb38\uc774\ub2e4. \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294 method chaining\uc744 \uc720\uc9c0\ud558\uba74\uc11c\ub3c4 \uc911\ucca9\ub41c Result \ud639\uc740 Option \ud615\uc2dd\uc744 \ud53c\ud560 \uc218 \uc788\ub294 and_then()\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf8\ub2e4. match \ubb38\uc744 \uc774\uc6a9\ud55c \ucc98\ub9ac \uc138\uac1c\uc758 \ud568\uc218 \uac01\uac01\uc774 \ub2e4\uc74c\uacfc \uac19\uc774 Result\ub97c \ubc18\ud658\ud55c\ub2e4\uace0 \ud574\ubcf4\uc790. use std::io::{Error, ErrorKind}; \/\/\/\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4528,"url":"https:\/\/litcoder.com\/?p=4528","url_meta":{"origin":4281,"position":2},"title":"Rust unittest\ub97c \uc704\ud55c \uc758\uc874\uc131 \uaca9\ub9ac","author":"litcoder","date":"2026\ub144 9\uc6d4 2\uc77c","format":false,"excerpt":"\ub2e4\ud589\ud788\ub3c4 \uc6b0\ub9ac\ub294 unittest\uc758 \uc720\uc6a9\ud568 \uc798 \uc54c\ub824\uc9c4 \uc2dc\ub300\uc5d0 \uc0b4\uace0 \uc788\uae30\uc5d0 \ub354 \uc774\uc0c1 unittest\ub97c \uc9c0\uc6d0\ud558\ub294 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\ub97c \ud2b9\ubcc4\ud558\uac8c \ubc1b\uc544\ub4e4\uc774\uc9c0 \uc54a\ub294\ub2e4. Rust\ub294 \ube44\uad50\uc801 \ucd5c\uc2e0 \uc5b8\uc5b4\uc778 \ub9cc\ud07c \uc774\ub7ec\ud55c \uc694\uad6c\uc0ac\ud56d\ub4e4\uc744 \uc801\uadf9\uc801\uc73c\ub85c \ubc1b\uc544\ub4e4\uc5ec \ubd80\uac00\uc801\uc778 \ud504\ub808\uc784\uc6cc\ud06c\uc758 \ub3c4\uc6c0 \uc5c6\uc774\ub3c4 \uc5b8\uc5b4 \uc790\uccb4\uc5d0\uc11c \uae30\ubcf8\uc801\uc778 unittest\uac00 \uc798 \uc9c0\uc6d0\ub41c\ub2e4. \ub2e4\ub9cc, Rust\ub294 \uc0c1\uc18d\uc744 \uc9c0\uc6d0\ud558\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 Python, Java, C++ \uac19\uc740 \uac1d\uccb4\uc9c0\ud5a5 \uc5b8\uc5b4\uc5d0\uc11c \uc758\uc874\uc131\uc744\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4558,"url":"https:\/\/litcoder.com\/?p=4558","url_meta":{"origin":4281,"position":3},"title":"Redis Stream\uc744 \uc774\uc6a9\ud55c task queue \uad6c\uc131","author":"litcoder","date":"2026\ub144 7\uc6d4 15\uc77c","format":false,"excerpt":"Redis stream\uc740 \ub370\uc774\ud130\uac00 \uacc4\uc18d \ucd94\uac00\ub418\ub294 logging\uac19\uc740 \uc0ac\uc6a9 \ucf00\uc774\uc2a4\ub97c \uc5fc\ub450\ud574 \ub450\uace0 \ub3c4\uc785\uc5c8\ub2e4\uace0 \ud55c\ub2e4. \ud558\uc9c0\ub9cc stream \ub0b4\uc5d0 \uc313\uc5ec \uc788\ub294 \uc544\uc774\ud15c \ub4e4 \uc911 ACK\ub97c \ubc1b\uc9c0 \ubabb\ud55c \uc544\uc774\ud15c\ub4e4\uc744 PEL(Pending Entries List)\ub85c \uad00\ub9ac \ud560 \uc218 \uc788\ub2e4 \ubcf4\ub2c8 \ucc98\ub9ac \ub0b4\uc5ed\uc744 \ud30c\uc545\ud558\uac70\ub098 \uc911\ubcf5\ub41c \ucc98\ub9ac\ub97c \ub9c9\ub294\ub370\uc5d0\ub3c4 \uc720\uc6a9\ud558\uac8c \uc0ac\uc6a9\ub420 \uc218 \uc788\ub2e4. Redis\ub294 \ub2e4\uc591\ud55c \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4 API\ub97c \uc9c0\uc6d0\ud558\uc9c0\ub9cc \uc774 \ud3ec\uc2a4\ud305\uc5d0\uc11c\ub294\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/06\/redis_task_queue_act.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/06\/redis_task_queue_act.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/06\/redis_task_queue_act.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/06\/redis_task_queue_act.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":4374,"url":"https:\/\/litcoder.com\/?p=4374","url_meta":{"origin":4281,"position":4},"title":"Rust \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c map() \ud65c\uc6a9","author":"litcoder","date":"2026\ub144 5\uc6d4 13\uc77c","format":false,"excerpt":"Python\uc774 \uadf8\ub7ec\ud558\ub4ef Rust\ub3c4 declarative programming(\uc120\uc5b8\ud615 \ud504\ub85c\uadf8\ub798\ubc0d)\uc744 \uc9c0\uc6d0\ud55c\ub2e4. \uadf8 \uc911 map()\uc740 \uc774\ub7ec\ud55c \ucf54\ub529\uc2a4\ud0c0\uc77c\uc758 \ub300\ud45c\ucc98\ub7fc \uc0ac\uc6a9\ub418\uace0\ub294 \ud558\ub294\ub370, \uc774\uac83\uc744 \uc774\uc6a9\ud558\uba74 \uae38\uace0 \uc7a5\ud669\ud55c \ucf54\ub4dc\ub97c \uac04\uacb0\ud558\uac8c \ub098\ud0c0\ub0bc \uc218 \uc788\ub2e4. \uae30\ubcf8\uc801 \uc0ac\uc6a9\ubc95 1 \ubd80\ud130 10\uae4c\uc9c0 1\uc529 \uc99d\uac00\ud558\ub294 \uac12\uc744 \uac00\uc9c4 i32 \ud615\uc758 10\uce78\uc9dc\ub9ac \ubc30\uc5f4 arr\uc774 \uc788\ub2e4\uace0 \ud560 \ub54c, \uadf8 \uc548\uc5d0 \uc788\ub294 \uac01 \uc6d0\uc18c\ub4e4\uc5d0 2\ub97c \uacf1\ud558\ub294 \ucf54\ub4dc\uc774\ub2e4. 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rust-analyzer\uac00 \uc124\uce58\ub418\uc5b4 \uc788\uc9c0 \uc54a\uc73c\uba74 \uc774\uc640 \uac19\uc740 \ubb38\uc81c\uac00 \uc0dd\uae38 \uc218 \uc788\uc73c\ub2c8 \ub2e4\uc74c\uc758 \uba85\ub839\uc5b4\ub85c rust-analyzer\ub97c update\ud574\ubcf8\ub2e4. \ub9cc\uc57d \uc124\uce58 \ub418\uc5b4 \uc788\uc9c0\u2026","rel":"","context":"&quot;Programming&quot;\uc5d0\uc11c","block_context":{"text":"Programming","link":"https:\/\/litcoder.com\/?cat=5"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/04\/rust-analyzer-tramp-error.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/04\/rust-analyzer-tramp-error.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/litcoder.com\/wp-content\/uploads\/2026\/04\/rust-analyzer-tramp-error.png?resize=525%2C300&ssl=1 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