[INFO] cloning repository https://github.com/Keksoj/tcp_echoer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Keksoj/tcp_echoer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeksoj%2Ftcp_echoer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeksoj%2Ftcp_echoer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 25e719cc76ef664e5babdb0c67543f2a19ecd8cb
[INFO] checking Keksoj/tcp_echoer against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeksoj%2Ftcp_echoer" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Keksoj/tcp_echoer on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Keksoj/tcp_echoer
[INFO] finished tweaking git repo https://github.com/Keksoj/tcp_echoer
[INFO] tweaked toml for git repo https://github.com/Keksoj/tcp_echoer written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Keksoj/tcp_echoer 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-sink v0.3.14
[INFO] [stderr]   Downloaded tokio-macros v1.1.0
[INFO] [stderr]   Downloaded futures-macro v0.3.14
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[INFO] [stderr]   Downloaded futures-channel v0.3.14
[INFO] [stderr]   Downloaded futures-util v0.3.14
[INFO] [stderr]   Downloaded tokio v1.5.0
[INFO] [stderr]   Downloaded futures-core v0.3.14
[INFO] [stderr]   Downloaded futures-io v0.3.14
[INFO] [stderr]   Downloaded futures-task v0.3.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69fd2367a013a9e343d8a26159b8560267d32523a6a887e37620eb3513897135
[INFO] running `Command { std: "docker" "start" "-a" "69fd2367a013a9e343d8a26159b8560267d32523a6a887e37620eb3513897135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69fd2367a013a9e343d8a26159b8560267d32523a6a887e37620eb3513897135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69fd2367a013a9e343d8a26159b8560267d32523a6a887e37620eb3513897135", kill_on_drop: false }`
[INFO] [stdout] 69fd2367a013a9e343d8a26159b8560267d32523a6a887e37620eb3513897135
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a81a13da2080e556c260153b10ff1555a9c23df226ac68134fbdeaa37c3a2f5f
[INFO] running `Command { std: "docker" "start" "-a" "a81a13da2080e556c260153b10ff1555a9c23df226ac68134fbdeaa37c3a2f5f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]     Checking regex-syntax v0.6.23
[INFO] [stderr]     Checking futures-sink v0.3.14
[INFO] [stderr]     Checking futures-core v0.3.14
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking futures-task v0.3.14
[INFO] [stderr]     Checking futures-channel v0.3.14
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking futures-io v0.3.14
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking lock_api v0.4.3
[INFO] [stderr]    Compiling tokio v1.5.0
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]     Checking tracing-log v0.1.2
[INFO] [stderr]     Checking tracing v0.1.25
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking sharded-slab v0.1.1
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking signal-hook-registry v1.3.0
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking regex v1.4.5
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.14
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]     Checking futures-util v0.3.14
[INFO] [stderr]     Checking futures-executor v0.3.14
[INFO] [stderr]     Checking futures v0.3.14
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking tracing-subscriber v0.2.17
[INFO] [stderr]     Checking tcp_echoer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `bincode` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bincode;
[INFO] [stdout]   |     ^^^^^^^ the item `bincode` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::boxed::Box`
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::boxed::Box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `String` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::string::String;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `String` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `info`, `warn`
[INFO] [stdout]   --> src/lib.rs:10:15
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `bincode` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bincode;
[INFO] [stdout]   |     ^^^^^^^ the item `bincode` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::boxed::Box`
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::boxed::Box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `String` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::string::String;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `String` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `info`, `warn`
[INFO] [stdout]   --> src/lib.rs:10:15
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Result`
[INFO] [stdout]  --> src/server.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use anyhow::{Context, Error, Result};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpStream`, `self`
[INFO] [stdout]  --> src/server.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     io::{self, AsyncReadExt, AsyncWriteExt},
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 5 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |                        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `debug`
[INFO] [stdout]  --> src/server.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tracing::{debug, info};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `JoinAll`, `join_all`
[INFO] [stdout]  --> src/client.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use futures::future::{join_all, JoinAll};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Result`
[INFO] [stdout]  --> src/server.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use anyhow::{Context, Error, Result};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/server.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     loop {
[INFO] [stdout] 22 | |         // bind a listener to the socket address
[INFO] [stdout] 23 | |
[INFO] [stdout] 24 | |         // we call it socket but it's a TcpStream, it implements AsyncRead and AsyncWrite
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |         });
[INFO] [stdout] 60 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 61 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/client.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/client.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpAddr`, `Ipv4Addr`, `SocketAddr`
[INFO] [stdout]  --> src/client.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::net::{IpAddr, Ipv4Addr, SocketAddr};
[INFO] [stdout]   |                ^^^^^^  ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpStream`, `self`
[INFO] [stdout]  --> src/server.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     io::{self, AsyncReadExt, AsyncWriteExt},
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 5 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |                        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task::JoinHandle`
[INFO] [stdout]   --> src/client.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task::JoinHandle,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `warn`
[INFO] [stdout]   --> src/client.rs:17:15
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `debug`
[INFO] [stdout]  --> src/server.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tracing::{debug, info};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/server.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     loop {
[INFO] [stdout] 22 | |         // bind a listener to the socket address
[INFO] [stdout] 23 | |
[INFO] [stdout] 24 | |         // we call it socket but it's a TcpStream, it implements AsyncRead and AsyncWrite
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |         });
[INFO] [stdout] 60 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 61 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `JoinAll`, `join_all`
[INFO] [stdout]  --> src/client.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use futures::future::{join_all, JoinAll};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/client.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/client.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpAddr`, `Ipv4Addr`, `SocketAddr`
[INFO] [stdout]  --> src/client.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::net::{IpAddr, Ipv4Addr, SocketAddr};
[INFO] [stdout]   |                ^^^^^^  ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task::JoinHandle`
[INFO] [stdout]   --> src/client.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task::JoinHandle,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `warn`
[INFO] [stdout]   --> src/client.rs:17:15
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `received_frame`
[INFO] [stdout]   --> src/client.rs:82:29
[INFO] [stdout]    |
[INFO] [stdout] 82 |                         let received_frame = lib::CustomFrame::from_bytes(received_data)
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_received_frame`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `oneshot_tx` is never read
[INFO] [stdout]   --> src/client.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Command {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     frame: CustomFrame,
[INFO] [stdout] 22 |     oneshot_tx: oneshot::Sender<CustomFrame>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Command` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_a_list_of_futures` is never used
[INFO] [stdout]    --> src/client.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn make_a_list_of_futures(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_a_word` is never used
[INFO] [stdout]    --> src/client.rs:169:10
[INFO] [stdout]     |
[INFO] [stdout] 169 | async fn send_a_word(mpsc_tx: Sender<Command>, word: String) -> anyhow::Result<()> {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `received_frame`
[INFO] [stdout]   --> src/client.rs:82:29
[INFO] [stdout]    |
[INFO] [stdout] 82 |                         let received_frame = lib::CustomFrame::from_bytes(received_data)
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_received_frame`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `oneshot_tx` is never read
[INFO] [stdout]   --> src/client.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Command {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     frame: CustomFrame,
[INFO] [stdout] 22 |     oneshot_tx: oneshot::Sender<CustomFrame>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Command` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_a_list_of_futures` is never used
[INFO] [stdout]    --> src/client.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn make_a_list_of_futures(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_a_word` is never used
[INFO] [stdout]    --> src/client.rs:169:10
[INFO] [stdout]     |
[INFO] [stdout] 169 | async fn send_a_word(mpsc_tx: Sender<Command>, word: String) -> anyhow::Result<()> {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.44s
[INFO] running `Command { std: "docker" "inspect" "a81a13da2080e556c260153b10ff1555a9c23df226ac68134fbdeaa37c3a2f5f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a81a13da2080e556c260153b10ff1555a9c23df226ac68134fbdeaa37c3a2f5f", kill_on_drop: false }`
[INFO] [stdout] a81a13da2080e556c260153b10ff1555a9c23df226ac68134fbdeaa37c3a2f5f
[INFO] checking Keksoj/tcp_echoer against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeksoj%2Ftcp_echoer" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Keksoj/tcp_echoer on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Keksoj/tcp_echoer
[INFO] finished tweaking git repo https://github.com/Keksoj/tcp_echoer
[INFO] tweaked toml for git repo https://github.com/Keksoj/tcp_echoer written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Keksoj/tcp_echoer 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0292c049a355c8e8c478cba6872b0f132859882d73bff697423d6554b52fe99
[INFO] running `Command { std: "docker" "start" "-a" "a0292c049a355c8e8c478cba6872b0f132859882d73bff697423d6554b52fe99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0292c049a355c8e8c478cba6872b0f132859882d73bff697423d6554b52fe99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0292c049a355c8e8c478cba6872b0f132859882d73bff697423d6554b52fe99", kill_on_drop: false }`
[INFO] [stdout] a0292c049a355c8e8c478cba6872b0f132859882d73bff697423d6554b52fe99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbf6a4012218ff0e00cce3f5786cc1dbba5ba914cff6d632d241970b233e054b
[INFO] running `Command { std: "docker" "start" "-a" "bbf6a4012218ff0e00cce3f5786cc1dbba5ba914cff6d632d241970b233e054b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling libc v0.2.93
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking futures-core v0.3.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking futures-sink v0.3.14
[INFO] [stderr]     Checking regex-syntax v0.6.23
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking futures-channel v0.3.14
[INFO] [stderr]     Checking futures-io v0.3.14
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking futures-task v0.3.14
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking lock_api v0.4.3
[INFO] [stderr]    Compiling tokio v1.5.0
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]     Checking tracing-log v0.1.2
[INFO] [stderr]     Checking tracing v0.1.25
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking sharded-slab v0.1.1
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking signal-hook-registry v1.3.0
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking rand_core v0.6.2
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking rand v0.8.3
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking regex v1.4.5
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]    Compiling futures-macro v0.3.14
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]     Checking futures-util v0.3.14
[INFO] [stderr]     Checking futures-executor v0.3.14
[INFO] [stderr]     Checking futures v0.3.14
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking tracing-subscriber v0.2.17
[INFO] [stderr]     Checking tcp_echoer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `bincode` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bincode;
[INFO] [stdout]   |     ^^^^^^^ the item `bincode` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::boxed::Box`
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::boxed::Box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `String` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::string::String;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `String` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `info`, `warn`
[INFO] [stdout]   --> src/lib.rs:10:15
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `bincode` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use bincode;
[INFO] [stdout]   |     ^^^^^^^ the item `bincode` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::boxed::Box`
[INFO] [stdout]  --> src/lib.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::boxed::Box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `String` is imported redundantly
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::string::String;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:134:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `String` is already defined here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `info`, `warn`
[INFO] [stdout]   --> src/lib.rs:10:15
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^  ^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Result`
[INFO] [stdout]  --> src/server.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use anyhow::{Context, Error, Result};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpStream`, `self`
[INFO] [stdout]  --> src/server.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     io::{self, AsyncReadExt, AsyncWriteExt},
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 5 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |                        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `debug`
[INFO] [stdout]  --> src/server.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tracing::{debug, info};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Error`, `Result`
[INFO] [stdout]  --> src/server.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use anyhow::{Context, Error, Result};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TcpStream`, `self`
[INFO] [stdout]  --> src/server.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 |     io::{self, AsyncReadExt, AsyncWriteExt},
[INFO] [stdout]   |          ^^^^
[INFO] [stdout] 5 |     net::{TcpListener, TcpStream},
[INFO] [stdout]   |                        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `debug`
[INFO] [stdout]  --> src/server.rs:7:15
[INFO] [stdout]   |
[INFO] [stdout] 7 | use tracing::{debug, info};
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/server.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     loop {
[INFO] [stdout] 22 | |         // bind a listener to the socket address
[INFO] [stdout] 23 | |
[INFO] [stdout] 24 | |         // we call it socket but it's a TcpStream, it implements AsyncRead and AsyncWrite
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |         });
[INFO] [stdout] 60 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 61 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `JoinAll`, `join_all`
[INFO] [stdout]  --> src/client.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use futures::future::{join_all, JoinAll};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/client.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/client.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpAddr`, `Ipv4Addr`, `SocketAddr`
[INFO] [stdout]  --> src/client.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::net::{IpAddr, Ipv4Addr, SocketAddr};
[INFO] [stdout]   |                ^^^^^^  ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task::JoinHandle`
[INFO] [stdout]   --> src/client.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task::JoinHandle,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `warn`
[INFO] [stdout]   --> src/client.rs:17:15
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `JoinAll`, `join_all`
[INFO] [stdout]  --> src/client.rs:2:23
[INFO] [stdout]   |
[INFO] [stdout] 2 | use futures::future::{join_all, JoinAll};
[INFO] [stdout]   |                       ^^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::error::Error`
[INFO] [stdout]  --> src/client.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::error::Error;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/client.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `IpAddr`, `Ipv4Addr`, `SocketAddr`
[INFO] [stdout]  --> src/client.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::net::{IpAddr, Ipv4Addr, SocketAddr};
[INFO] [stdout]   |                ^^^^^^  ^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task::JoinHandle`
[INFO] [stdout]   --> src/client.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task::JoinHandle,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `debug`, `warn`
[INFO] [stdout]   --> src/client.rs:17:15
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tracing::{debug, info, warn};
[INFO] [stdout]    |               ^^^^^        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/server.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | /     loop {
[INFO] [stdout] 22 | |         // bind a listener to the socket address
[INFO] [stdout] 23 | |
[INFO] [stdout] 24 | |         // we call it socket but it's a TcpStream, it implements AsyncRead and AsyncWrite
[INFO] [stdout] ...  |
[INFO] [stdout] 59 | |         });
[INFO] [stdout] 60 | |     }
[INFO] [stdout]    | |_____- any code following this expression is unreachable
[INFO] [stdout] 61 |       Ok(())
[INFO] [stdout]    |       ^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `received_frame`
[INFO] [stdout]   --> src/client.rs:82:29
[INFO] [stdout]    |
[INFO] [stdout] 82 |                         let received_frame = lib::CustomFrame::from_bytes(received_data)
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_received_frame`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `received_frame`
[INFO] [stdout]   --> src/client.rs:82:29
[INFO] [stdout]    |
[INFO] [stdout] 82 |                         let received_frame = lib::CustomFrame::from_bytes(received_data)
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_received_frame`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `oneshot_tx` is never read
[INFO] [stdout]   --> src/client.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Command {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     frame: CustomFrame,
[INFO] [stdout] 22 |     oneshot_tx: oneshot::Sender<CustomFrame>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Command` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_a_list_of_futures` is never used
[INFO] [stdout]    --> src/client.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn make_a_list_of_futures(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_a_word` is never used
[INFO] [stdout]    --> src/client.rs:169:10
[INFO] [stdout]     |
[INFO] [stdout] 169 | async fn send_a_word(mpsc_tx: Sender<Command>, word: String) -> anyhow::Result<()> {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `oneshot_tx` is never read
[INFO] [stdout]   --> src/client.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Command {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 21 |     frame: CustomFrame,
[INFO] [stdout] 22 |     oneshot_tx: oneshot::Sender<CustomFrame>,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Command` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_a_list_of_futures` is never used
[INFO] [stdout]    --> src/client.rs:151:4
[INFO] [stdout]     |
[INFO] [stdout] 151 | fn make_a_list_of_futures(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `send_a_word` is never used
[INFO] [stdout]    --> src/client.rs:169:10
[INFO] [stdout]     |
[INFO] [stdout] 169 | async fn send_a_word(mpsc_tx: Sender<Command>, word: String) -> anyhow::Result<()> {
[INFO] [stdout]     |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.20s
[INFO] running `Command { std: "docker" "inspect" "bbf6a4012218ff0e00cce3f5786cc1dbba5ba914cff6d632d241970b233e054b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbf6a4012218ff0e00cce3f5786cc1dbba5ba914cff6d632d241970b233e054b", kill_on_drop: false }`
[INFO] [stdout] bbf6a4012218ff0e00cce3f5786cc1dbba5ba914cff6d632d241970b233e054b