[INFO] cloning repository https://github.com/Prince-Stolas/TelChat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Prince-Stolas/TelChat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrince-Stolas%2FTelChat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrince-Stolas%2FTelChat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 15e5893128443a9ffdd4592fbe4806f3c9492f10
[INFO] checking Prince-Stolas/TelChat against try#4e55a504843955c97eb06907c71f6f3e99208021 for pr-146978
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrince-Stolas%2FTelChat" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Prince-Stolas/TelChat
[INFO] finished tweaking git repo https://github.com/Prince-Stolas/TelChat
[INFO] tweaked toml for git repo https://github.com/Prince-Stolas/TelChat written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Prince-Stolas/TelChat on toolchain 4e55a504843955c97eb06907c71f6f3e99208021
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Prince-Stolas/TelChat already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mvutils v0.6.1
[INFO] [stderr]   Downloaded num-traits v0.2.18
[INFO] [stderr]   Downloaded mvutils-proc-macro v0.4.0
[INFO] [stderr]   Downloaded autocfg v1.2.0
[INFO] [stderr]   Downloaded bytebuffer v2.2.0
[INFO] [stderr]   Downloaded mvutils v0.5.7
[INFO] [stderr]   Downloaded zerocopy-derive v0.7.32
[INFO] [stderr]   Downloaded crossbeam-utils v0.8.19
[INFO] [stderr]   Downloaded proc-macro2 v1.0.81
[INFO] [stderr]   Downloaded crossbeam-channel v0.5.12
[INFO] [stderr]   Downloaded zerocopy v0.7.32
[INFO] [stderr]   Downloaded syn v2.0.60
[INFO] [stderr]   Downloaded libc v0.2.154
[INFO] [stderr]   Downloaded mvsync v1.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5421cc74ca3f09772f0973dca927f2ad3f8f966f9f87dfc1b13e2899c2d3a3a5
[INFO] running `Command { std: "docker" "start" "-a" "5421cc74ca3f09772f0973dca927f2ad3f8f966f9f87dfc1b13e2899c2d3a3a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5421cc74ca3f09772f0973dca927f2ad3f8f966f9f87dfc1b13e2899c2d3a3a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5421cc74ca3f09772f0973dca927f2ad3f8f966f9f87dfc1b13e2899c2d3a3a5", kill_on_drop: false }`
[INFO] [stdout] 5421cc74ca3f09772f0973dca927f2ad3f8f966f9f87dfc1b13e2899c2d3a3a5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4e55a504843955c97eb06907c71f6f3e99208021" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ecc0b00985d2bc958b0f323b8b098c63705f05d1de6574f1f4597137db1c8116
[INFO] running `Command { std: "docker" "start" "-a" "ecc0b00985d2bc958b0f323b8b098c63705f05d1de6574f1f4597137db1c8116", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.81
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]     Checking zerocopy v0.7.32
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking allocator-api2 v0.2.18
[INFO] [stderr]    Compiling ahash v0.8.11
[INFO] [stderr]     Checking bytebuffer v2.2.0
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking hashbrown v0.14.5
[INFO] [stderr]     Checking crossbeam-channel v0.5.12
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.60
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]    Compiling mvutils-proc-macro v0.4.0
[INFO] [stderr]     Checking mvutils v0.5.7
[INFO] [stderr]     Checking mvutils v0.6.1
[INFO] [stderr]     Checking mvsync v1.2.0
[INFO] [stderr]     Checking TelChat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `LineWriter`, and `Read`
[INFO] [stdout]  --> src/main.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::{Error, LineWriter, Read, Write};
[INFO] [stdout]   |               ^^^^^  ^^^^^^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TcpStream`
[INFO] [stdout]  --> src/main.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::net::{TcpListener, TcpStream};
[INFO] [stdout]   |                             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `PClamp`
[INFO] [stdout]  --> src/main.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | use mvutils::utils::{PClamp, Recover};
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ui::draw_input_box`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use crate::ui::draw_input_box;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `CStr` and `CString`
[INFO] [stdout]  --> src/tcp.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ffi::{CStr, CString};
[INFO] [stdout]   |                ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `LineWriter`, and `Read`
[INFO] [stdout]  --> src/main.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::io::{Error, LineWriter, Read, Write};
[INFO] [stdout]   |               ^^^^^  ^^^^^^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TcpStream`
[INFO] [stdout]  --> src/main.rs:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::net::{TcpListener, TcpStream};
[INFO] [stdout]   |                             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `PClamp`
[INFO] [stdout]  --> src/main.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 | use mvutils::utils::{PClamp, Recover};
[INFO] [stdout]   |                      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ui::draw_input_box`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use crate::ui::draw_input_box;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `CStr` and `CString`
[INFO] [stdout]  --> src/tcp.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ffi::{CStr, CString};
[INFO] [stdout]   |                ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     loop {
[INFO] [stdout] 42 | |         let mut guard = client_handler.write().recover();
[INFO] [stdout] 43 | |         guard.update_clients();
[INFO] [stdout] 44 | |         drop(guard);
[INFO] [stdout] 45 | |         sleep(Duration::from_millis(10));
[INFO] [stdout] 46 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 47 |
[INFO] [stdout] 48 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 41 | /     loop {
[INFO] [stdout] 42 | |         let mut guard = client_handler.write().recover();
[INFO] [stdout] 43 | |         guard.update_clients();
[INFO] [stdout] 44 | |         drop(guard);
[INFO] [stdout] 45 | |         sleep(Duration::from_millis(10));
[INFO] [stdout] 46 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 47 |
[INFO] [stdout] 48 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut client_handler = Arc::new(RwLock::new(ClientHandler::new()));
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle`
[INFO] [stdout]   --> src/main.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let (task, handle) = sync.create_async_task(move || async move {
[INFO] [stdout]    |                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `draw_input_box` is never used
[INFO] [stdout]  --> src/ui.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn draw_input_box<T>(writer: &mut LineWriter<T>, width: i32, contents: String) where T: ?Sized + Write {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `StringUtils` is never used
[INFO] [stdout]   --> src/ui.rs:20:11
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub trait StringUtils {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `start` is never used
[INFO] [stdout]  --> src/tcp.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn start(port: i32) -> TcpStream {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `user_names` is never read
[INFO] [stdout]   --> src/tcp.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct ClientHandler {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 14 |     user_names: HashMap<SocketAddr, String>
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut client_handler = Arc::new(RwLock::new(ClientHandler::new()));
[INFO] [stdout]    |         ----^^^^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle`
[INFO] [stdout]   --> src/main.rs:27:16
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let (task, handle) = sync.create_async_task(move || async move {
[INFO] [stdout]    |                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `draw_input_box` is never used
[INFO] [stdout]  --> src/ui.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn draw_input_box<T>(writer: &mut LineWriter<T>, width: i32, contents: String) where T: ?Sized + Write {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `StringUtils` is never used
[INFO] [stdout]   --> src/ui.rs:20:11
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub trait StringUtils {
[INFO] [stdout]    |           ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `start` is never used
[INFO] [stdout]  --> src/tcp.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn start(port: i32) -> TcpStream {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `user_names` is never read
[INFO] [stdout]   --> src/tcp.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct ClientHandler {
[INFO] [stdout]    |            ------------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 14 |     user_names: HashMap<SocketAddr, String>
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |             stream.write("welcome to the chatroom\r\n".to_string().as_bytes());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 31 |             let _ = stream.write("welcome to the chatroom\r\n".to_string().as_bytes());
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |             stream.write("Please enter your name: ".to_string().as_bytes());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 32 |             let _ = stream.write("Please enter your name: ".to_string().as_bytes());
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/tcp.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 client.shutdown(Shutdown::Both);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 let _ = client.shutdown(Shutdown::Both);
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:31:13
[INFO] [stdout]    |
[INFO] [stdout] 31 |             stream.write("welcome to the chatroom\r\n".to_string().as_bytes());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 31 |             let _ = stream.write("welcome to the chatroom\r\n".to_string().as_bytes());
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |             stream.write("Please enter your name: ".to_string().as_bytes());
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 32 |             let _ = stream.write("Please enter your name: ".to_string().as_bytes());
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/tcp.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 client.shutdown(Shutdown::Both);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 38 |                 let _ = client.shutdown(Shutdown::Both);
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.37s
[INFO] running `Command { std: "docker" "inspect" "ecc0b00985d2bc958b0f323b8b098c63705f05d1de6574f1f4597137db1c8116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecc0b00985d2bc958b0f323b8b098c63705f05d1de6574f1f4597137db1c8116", kill_on_drop: false }`
[INFO] [stdout] ecc0b00985d2bc958b0f323b8b098c63705f05d1de6574f1f4597137db1c8116
