[INFO] cloning repository https://github.com/gavxin/rust-misc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gavxin/rust-misc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgavxin%2Frust-misc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgavxin%2Frust-misc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 033a89b9fc5d83f095dd151d391eb44de2f5eb8c
[INFO] testing gavxin/rust-misc against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgavxin%2Frust-misc" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gavxin/rust-misc on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gavxin/rust-misc
[INFO] finished tweaking git repo https://github.com/gavxin/rust-misc
[INFO] tweaked toml for git repo https://github.com/gavxin/rust-misc written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/gavxin/rust-misc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 80d1454c54e3bda544499b397d5cd60961073a21302a92b260e03bf7461f0e1f
[INFO] running `Command { std: "docker" "start" "-a" "80d1454c54e3bda544499b397d5cd60961073a21302a92b260e03bf7461f0e1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80d1454c54e3bda544499b397d5cd60961073a21302a92b260e03bf7461f0e1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80d1454c54e3bda544499b397d5cd60961073a21302a92b260e03bf7461f0e1f", kill_on_drop: false }`
[INFO] [stdout] 80d1454c54e3bda544499b397d5cd60961073a21302a92b260e03bf7461f0e1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22aa16926965bdf16478e37f83a7651f836a402156797371fbf476c99e95979a
[INFO] running `Command { std: "docker" "start" "-a" "22aa16926965bdf16478e37f83a7651f836a402156797371fbf476c99e95979a", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-misc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Ipv6Addr`, `SocketAddrV4`, `SocketAddr`
[INFO] [stdout]  --> src/bin/simple_socks_proxy.rs:3:50
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::net::{TcpListener, TcpStream, Shutdown, SocketAddr, SocketAddrV4, Ipv4Addr, Ipv6Addr};
[INFO] [stdout]   |                                                  ^^^^^^^^^^  ^^^^^^^^^^^^            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/bin/simple_socks_proxy.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:134:24
[INFO] [stdout]     |
[INFO] [stdout] 134 |                     if (e.kind() == ErrorKind::WouldBlock) {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 148 | /     loop {
[INFO] [stdout] 149 | |         match stream.read(&mut buff) {
[INFO] [stdout] 150 | |             Ok(n) => {
[INFO] [stdout] 151 | |                 if n == 0 {
[INFO] [stdout] ...   |
[INFO] [stdout] 171 | |         }
[INFO] [stdout] 172 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 176 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut s : String;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |             let mut port = ((tmp[4] as u16) << 8) + tmp[5] as u16;
[INFO] [stdout]    |                 ----^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:70:17
[INFO] [stdout]    |
[INFO] [stdout] 70 |             let mut port = ((port_buf[0] as u16) << 8) + port_buf[1] as u16;
[INFO] [stdout]    |                 ----^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:195:13
[INFO] [stdout]     |
[INFO] [stdout] 195 |             dbg!(ret);
[INFO] [stdout]     |             ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.74s
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "22aa16926965bdf16478e37f83a7651f836a402156797371fbf476c99e95979a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22aa16926965bdf16478e37f83a7651f836a402156797371fbf476c99e95979a", kill_on_drop: false }`
[INFO] [stdout] 22aa16926965bdf16478e37f83a7651f836a402156797371fbf476c99e95979a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf153da99ee5347f8102229f7498f2096348109c8bbb0ee21ac5b2c0b98fe935
[INFO] running `Command { std: "docker" "start" "-a" "cf153da99ee5347f8102229f7498f2096348109c8bbb0ee21ac5b2c0b98fe935", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-misc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Ipv6Addr`, `SocketAddrV4`, `SocketAddr`
[INFO] [stdout]  --> src/bin/simple_socks_proxy.rs:3:50
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::net::{TcpListener, TcpStream, Shutdown, SocketAddr, SocketAddrV4, Ipv4Addr, Ipv6Addr};
[INFO] [stdout]   |                                                  ^^^^^^^^^^  ^^^^^^^^^^^^            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/bin/simple_socks_proxy.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::Duration;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:134:24
[INFO] [stdout]     |
[INFO] [stdout] 134 |                     if (e.kind() == ErrorKind::WouldBlock) {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:176:5
[INFO] [stdout]     |
[INFO] [stdout] 148 | /     loop {
[INFO] [stdout] 149 | |         match stream.read(&mut buff) {
[INFO] [stdout] 150 | |             Ok(n) => {
[INFO] [stdout] 151 | |                 if n == 0 {
[INFO] [stdout] ...   |
[INFO] [stdout] 171 | |         }
[INFO] [stdout] 172 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] ...
[INFO] [stdout] 176 |       Ok(())
[INFO] [stdout]     |       ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let mut s : String;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |             let mut port = ((tmp[4] as u16) << 8) + tmp[5] as u16;
[INFO] [stdout]    |                 ----^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/simple_socks_proxy.rs:70:17
[INFO] [stdout]    |
[INFO] [stdout] 70 |             let mut port = ((port_buf[0] as u16) << 8) + port_buf[1] as u16;
[INFO] [stdout]    |                 ----^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/bin/simple_socks_proxy.rs:195:13
[INFO] [stdout]     |
[INFO] [stdout] 195 |             dbg!(ret);
[INFO] [stdout]     |             ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.37s
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "cf153da99ee5347f8102229f7498f2096348109c8bbb0ee21ac5b2c0b98fe935", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf153da99ee5347f8102229f7498f2096348109c8bbb0ee21ac5b2c0b98fe935", kill_on_drop: false }`
[INFO] [stdout] cf153da99ee5347f8102229f7498f2096348109c8bbb0ee21ac5b2c0b98fe935
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] cd49eb99f02fd848ca026f99440e3d29effe5b9096f0c6f023e245f41e0d8904
[INFO] running `Command { std: "docker" "start" "-a" "cd49eb99f02fd848ca026f99440e3d29effe5b9096f0c6f023e245f41e0d8904", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused imports: `Ipv6Addr`, `SocketAddrV4`, `SocketAddr`
[INFO] [stdout] running 0 tests
[INFO] [stderr]  --> src/bin/simple_socks_proxy.rs:3:50
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 3 | use std::net::{TcpListener, TcpStream, Shutdown, SocketAddr, SocketAddrV4, Ipv4Addr, Ipv6Addr};
[INFO] [stdout] 
[INFO] [stderr]   |                                                  ^^^^^^^^^^  ^^^^^^^^^^^^            ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/bin/simple_socks_proxy.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/bin/simple_socks_proxy.rs:134:24
[INFO] [stderr]     |
[INFO] [stderr] 134 |                     if (e.kind() == ErrorKind::WouldBlock) {
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/bin/simple_socks_proxy.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 148 | /     loop {
[INFO] [stderr] 149 | |         match stream.read(&mut buff) {
[INFO] [stderr] 150 | |             Ok(n) => {
[INFO] [stderr] 151 | |                 if n == 0 {
[INFO] [stderr] ...   |
[INFO] [stderr] 171 | |         }
[INFO] [stderr] 172 | |     }
[INFO] [stderr]     | |_____- any code following this expression is unreachable
[INFO] [stderr] ...
[INFO] [stderr] 176 |       Ok(())
[INFO] [stderr]     |       ^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/simple_socks_proxy.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let mut s : String;
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/simple_socks_proxy.rs:60:17
[INFO] [stderr]    |
[INFO] [stderr] 60 |             let mut port = ((tmp[4] as u16) << 8) + tmp[5] as u16;
[INFO] [stderr]    |                 ----^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/simple_socks_proxy.rs:70:17
[INFO] [stderr]    |
[INFO] [stderr] 70 |             let mut port = ((port_buf[0] as u16) << 8) + port_buf[1] as u16;
[INFO] [stderr]    |                 ----^^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/bin/simple_socks_proxy.rs:195:13
[INFO] [stderr]     |
[INFO] [stderr] 195 |             dbg!(ret);
[INFO] [stderr]     |             ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in the macro `dbg` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-misc` (bin "simple_socks_proxy" test) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/simple_socks_proxy-65fadb496606c372)
[INFO] running `Command { std: "docker" "inspect" "cd49eb99f02fd848ca026f99440e3d29effe5b9096f0c6f023e245f41e0d8904", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd49eb99f02fd848ca026f99440e3d29effe5b9096f0c6f023e245f41e0d8904", kill_on_drop: false }`
[INFO] [stdout] cd49eb99f02fd848ca026f99440e3d29effe5b9096f0c6f023e245f41e0d8904