{"$message_type":"diagnostic","message":"failed to resolve: use of undeclared type `TcpListener`","code":{"code":"E0433","explanation":"An undeclared crate, module, or type was used.\n\nErroneous code example:\n\n```compile_fail,E0433\nlet map = HashMap::new();\n// error: failed to resolve: use of undeclared type `HashMap`\n```\n\nPlease verify you didn't misspell the type/module's name or that you didn't\nforget to import it:\n\n```\nuse std::collections::HashMap; // HashMap has been imported.\nlet map: HashMap<u32, u32> = HashMap::new(); // So it can be used!\n```\n\nIf you've expected to use a crate name:\n\n```compile_fail\nuse ferris_wheel::BigO;\n// error: failed to resolve: use of undeclared module or unlinked crate\n```\n\nMake sure the crate has been added as a dependency in `Cargo.toml`.\n\nTo use a module from your current crate, add the `crate::` prefix to the path.\n"},"level":"error","spans":[{"file_name":"src/main.rs","byte_start":2907,"byte_end":2918,"line_start":104,"line_end":104,"column_start":20,"column_end":31,"is_primary":true,"text":[{"text":"    let listener = TcpListener::bind(addr).await;","highlight_start":20,"highlight_end":31}],"label":"use of undeclared type `TcpListener`","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"consider importing one of these structs","code":null,"level":"help","spans":[{"file_name":"src/main.rs","byte_start":15,"byte_end":15,"line_start":2,"line_end":2,"column_start":1,"column_end":1,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":1,"highlight_end":1}],"label":null,"suggested_replacement":"use std::net::TcpListener;\n","suggestion_applicability":"MaybeIncorrect","expansion":null},{"file_name":"src/main.rs","byte_start":15,"byte_end":15,"line_start":2,"line_end":2,"column_start":1,"column_end":1,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":1,"highlight_end":1}],"label":null,"suggested_replacement":"use tokio::net::TcpListener;\n","suggestion_applicability":"MaybeIncorrect","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror[E0433]\u001b[0m\u001b[0m\u001b[1m: failed to resolve: use of undeclared type `TcpListener`\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:104:20\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m104\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0m    let listener = TcpListener::bind(addr).await;\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m                    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9m^^^^^^^^^^^\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;9muse of undeclared type `TcpListener`\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;14mhelp\u001b[0m\u001b[0m: consider importing one of these structs\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m2\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[38;5;10m+ use std::net::TcpListener;\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m2\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[38;5;10m+ use tokio::net::TcpListener;\u001b[0m\n\u001b[0m    \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"unused imports: `collections::HashMap` and `thread`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":25,"byte_end":45,"line_start":2,"line_end":2,"column_start":11,"column_end":31,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":11,"highlight_end":31}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null},{"file_name":"src/main.rs","byte_start":51,"byte_end":57,"line_start":2,"line_end":2,"column_start":37,"column_end":43,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":37,"highlight_end":43}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove the unused imports","code":null,"level":"help","spans":[{"file_name":"src/main.rs","byte_start":25,"byte_end":47,"line_start":2,"line_end":2,"column_start":11,"column_end":33,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":11,"highlight_end":33}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null},{"file_name":"src/main.rs","byte_start":49,"byte_end":57,"line_start":2,"line_end":2,"column_start":35,"column_end":43,"is_primary":true,"text":[{"text":"use std::{collections::HashMap, fs, thread, time::Duration};","highlight_start":35,"highlight_end":43}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused imports: `collections::HashMap` and `thread`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:2:11\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m2\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse std::{collections::HashMap, fs, thread, time::Duration};\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m           \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^^^^^^^^^^\u001b[0m\u001b[0m      \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"unused import: `Mutex`","code":{"code":"unused_imports","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":161,"byte_end":166,"line_start":5,"line_end":5,"column_start":22,"column_end":27,"is_primary":true,"text":[{"text":"use std::sync::{Arc, Mutex};","highlight_start":22,"highlight_end":27}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"remove the unused import","code":null,"level":"help","spans":[{"file_name":"src/main.rs","byte_start":159,"byte_end":166,"line_start":5,"line_end":5,"column_start":20,"column_end":27,"is_primary":true,"text":[{"text":"use std::sync::{Arc, Mutex};","highlight_start":20,"highlight_end":27}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null},{"file_name":"src/main.rs","byte_start":155,"byte_end":156,"line_start":5,"line_end":5,"column_start":16,"column_end":17,"is_primary":true,"text":[{"text":"use std::sync::{Arc, Mutex};","highlight_start":16,"highlight_end":17}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null},{"file_name":"src/main.rs","byte_start":166,"byte_end":167,"line_start":5,"line_end":5,"column_start":27,"column_end":28,"is_primary":true,"text":[{"text":"use std::sync::{Arc, Mutex};","highlight_start":27,"highlight_end":28}],"label":null,"suggested_replacement":"","suggestion_applicability":"MachineApplicable","expansion":null}],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: unused import: `Mutex`\u001b[0m\n\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:5:22\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m5\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m \u001b[0m\u001b[0muse std::sync::{Arc, Mutex};\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\u001b[0m                      \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"aborting due to 1 previous error; 2 warnings emitted","code":null,"level":"error","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[38;5;9merror\u001b[0m\u001b[0m\u001b[1m: aborting due to 1 previous error; 2 warnings emitted\u001b[0m\n\n"}
{"$message_type":"diagnostic","message":"For more information about this error, try `rustc --explain E0433`.","code":null,"level":"failure-note","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1mFor more information about this error, try `rustc --explain E0433`.\u001b[0m\n"}