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2026-03-10 10:03:49 +08:00

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{"$message_type":"diagnostic","message":"unused import: `std::io`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src\\main.rs","byte_start":4,"byte_end":11,"line_start":1,"line_end":1,"column_start":5,"column_end":12,"is_primary":true,"text":[{"text":"use std::io;","highlight_start":5,"highlight_end":12}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_imports)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove the whole `use` item","code":null,"level":"help","spans":[{"file_name":"src\\main.rs","byte_start":0,"byte_end":13,"line_start":1,"line_end":2,"column_start":1,"column_end":1,"is_primary":true,"text":[{"text":"use std::io;","highlight_start":1,"highlight_end":13},{"text":"","highlight_start":1,"highlight_end":1}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;11mwarning\u001b[0m\u001b[0m\u001b[1m\u001b[38;5;15m: unused import: `std::io`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m--> \u001b[0m\u001b[0msrc\\main.rs:1:5\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;14m1\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse std::io;\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;11m^^^^^^^\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m= \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;15mnote\u001b[0m\u001b[0m: `#[warn(unused_imports)]` on by default\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"variable does not need to be mutable","code":{"code":"unused_mut","explanation":null},"level":"warning","spans":[{"file_name":"src\\main.rs","byte_start":66,"byte_end":72,"line_start":6,"line_end":6,"column_start":9,"column_end":15,"is_primary":true,"text":[{"text":" let mut s1 = String::from(\"This\");","highlight_start":9,"highlight_end":15}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_mut)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove this `mut`","code":null,"level":"help","spans":[{"file_name":"src\\main.rs","byte_start":66,"byte_end":70,"line_start":6,"line_end":6,"column_start":9,"column_end":13,"is_primary":true,"text":[{"text":" let mut s1 = String::from(\"This\");","highlight_start":9,"highlight_end":13}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;11mwarning\u001b[0m\u001b[0m\u001b[1m\u001b[38;5;15m: variable does not need to be mutable\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m--> \u001b[0m\u001b[0msrc\\main.rs:6:9\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;14m6\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m let mut s1 = String::from(\"This\");\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m----\u001b[0m\u001b[0m\u001b[1m\u001b[38;5;11m^^\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14mhelp: remove this `mut`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m|\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;14m= \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;15mnote\u001b[0m\u001b[0m: `#[warn(unused_mut)]` on by default\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"2 warnings emitted","code":null,"level":"warning","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;11mwarning\u001b[0m\u001b[0m\u001b[1m\u001b[38;5;15m: 2 warnings emitted\u001b[0m\n\n"}