[INFO] cloning repository https://github.com/hqt/tcpserver-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hqt/tcpserver-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhqt%2Ftcpserver-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhqt%2Ftcpserver-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca81a994938c45083a5bf5ba6ced438e4c49af64
[INFO] checking hqt/tcpserver-rust against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhqt%2Ftcpserver-rust" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hqt/tcpserver-rust on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hqt/tcpserver-rust
[INFO] finished tweaking git repo https://github.com/hqt/tcpserver-rust
[INFO] tweaked toml for git repo https://github.com/hqt/tcpserver-rust written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/hqt/tcpserver-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a4e14cae00612ea11f450b54ef6568c42de21194eaa08fa37b21116dcdb54888
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a4e14cae00612ea11f450b54ef6568c42de21194eaa08fa37b21116dcdb54888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a4e14cae00612ea11f450b54ef6568c42de21194eaa08fa37b21116dcdb54888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4e14cae00612ea11f450b54ef6568c42de21194eaa08fa37b21116dcdb54888", kill_on_drop: false }`
[INFO] [stdout] a4e14cae00612ea11f450b54ef6568c42de21194eaa08fa37b21116dcdb54888
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 35fe461d3da614854545579d023da9c973ee9a2411f225c61cc1ae05f12ac042
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "35fe461d3da614854545579d023da9c973ee9a2411f225c61cc1ae05f12ac042", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking client v0.1.0 (/opt/rustwide/workdir/client)
[INFO] [stderr]     Checking server v0.1.0 (/opt/rustwide/workdir/server)
[INFO] [stdout] warning: unused imports: `Read`, `Write`
[INFO] [stdout]  --> server/src/client_manager.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{Write, Read};
[INFO] [stdout]   |               ^^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::id_generator::IDGenerator`
[INFO] [stdout]   --> server/src/client_manager.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     use crate::id_generator::IDGenerator;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MutexGuard`, `Mutex`
[INFO] [stdout]  --> server/src/server.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::sync::{Arc, Mutex, MutexGuard};
[INFO] [stdout]   |                      ^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> server/src/server.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> server/src/server.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn start_test_server(&mut self) -> Result<(String), io::Error> {
[INFO] [stdout]    |                                                   ^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Read`, `Write`
[INFO] [stdout]  --> server/src/client_manager.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{Write, Read};
[INFO] [stdout]   |               ^^^^^  ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MutexGuard`, `Mutex`
[INFO] [stdout]  --> server/src/server.rs:6:22
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::sync::{Arc, Mutex, MutexGuard};
[INFO] [stdout]   |                      ^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::Borrow`
[INFO] [stdout]  --> server/src/server.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::borrow::Borrow;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]   --> server/src/server.rs:32:51
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn start_test_server(&mut self) -> Result<(String), io::Error> {
[INFO] [stdout]    |                                                   ^^^^^^^^ help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `server`
[INFO] [stdout]   --> server/src/server.rs:80:18
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn handle_client(server: Arc<ServerCore>, mut stream: TcpStream) {
[INFO] [stdout]    |                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_server`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `server`
[INFO] [stdout]   --> server/src/server.rs:80:18
[INFO] [stdout]    |
[INFO] [stdout] 80 | fn handle_client(server: Arc<ServerCore>, mut stream: TcpStream) {
[INFO] [stdout]    |                  ^^^^^^ help: if this is intentional, prefix it with an underscore: `_server`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id_generator`
[INFO] [stdout]  --> server/src/client_manager.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     id_generator: IDGenerator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `counter`
[INFO] [stdout]  --> server/src/id_generator.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     counter: AtomicUsize
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `next_id`
[INFO] [stdout]   --> server/src/id_generator.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     pub fn next_id(&self) -> usize {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id_generator`
[INFO] [stdout]  --> server/src/client_manager.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     id_generator: IDGenerator,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `clients`
[INFO] [stdout]  --> server/src/client_manager.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     clients: HashMap<usize, TcpStream>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_client`
[INFO] [stdout]   --> server/src/client_manager.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn add_client(&mut self, conn: TcpStream) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static is never used: `TEST_PORT`
[INFO] [stdout]   --> server/src/server.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | static TEST_PORT: AtomicUsize = AtomicUsize::new(20_000);
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `listener`
[INFO] [stdout]   --> server/src/server.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     listener: Option<TcpListener>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `client_managers`
[INFO] [stdout]   --> server/src/server.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     client_managers: ClientManager,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `start_test_server`
[INFO] [stdout]   --> server/src/server.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub fn start_test_server(&mut self) -> Result<(String), io::Error> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> server/src/server.rs:94:24
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 panic!(err);
[INFO] [stdout]    |                        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 panic!("{}", err);
[INFO] [stdout]    |                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 std::panic::panic_any(err);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]  --> server/src/main.rs:9:26
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => panic!(e),
[INFO] [stdout]   |                          ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => panic!("{}", e),
[INFO] [stdout]   |                          ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => std::panic::panic_any(e),
[INFO] [stdout]   |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `clients`
[INFO] [stdout]  --> server/src/client_manager.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     clients: HashMap<usize, TcpStream>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add_client`
[INFO] [stdout]   --> server/src/client_manager.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn add_client(&mut self, conn: TcpStream) {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `listener`
[INFO] [stdout]   --> server/src/server.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     listener: Option<TcpListener>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `client_managers`
[INFO] [stdout]   --> server/src/server.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     client_managers: ClientManager,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> server/src/server.rs:94:24
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 panic!(err);
[INFO] [stdout]    |                        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 panic!("{}", err);
[INFO] [stdout]    |                        ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 94 |                 std::panic::panic_any(err);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]  --> server/src/main.rs:9:26
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => panic!(e),
[INFO] [stdout]   |                          ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => panic!("{}", e),
[INFO] [stdout]   |                          ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]   |
[INFO] [stdout] 9 |         Err(e) => std::panic::panic_any(e),
[INFO] [stdout]   |                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 13 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "35fe461d3da614854545579d023da9c973ee9a2411f225c61cc1ae05f12ac042", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35fe461d3da614854545579d023da9c973ee9a2411f225c61cc1ae05f12ac042", kill_on_drop: false }`
[INFO] [stdout] 35fe461d3da614854545579d023da9c973ee9a2411f225c61cc1ae05f12ac042