[INFO] cloning repository https://github.com/UnChosenUndead/tcp_server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UnChosenUndead/tcp_server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnChosenUndead%2Ftcp_server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnChosenUndead%2Ftcp_server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3528b25c6302070d7d1930d65c3062ba0f7d45a1
[INFO] building UnChosenUndead/tcp_server against try#9b5e8b16bd1c4acf4cf8e6880368314cf021a987+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnChosenUndead%2Ftcp_server" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/UnChosenUndead/tcp_server on toolchain 9b5e8b16bd1c4acf4cf8e6880368314cf021a987
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/UnChosenUndead/tcp_server
[INFO] finished tweaking git repo https://github.com/UnChosenUndead/tcp_server
[INFO] tweaked toml for git repo https://github.com/UnChosenUndead/tcp_server written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/UnChosenUndead/tcp_server 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" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8812337d8089bfeccd291c5ef8e2635a98caac191c584687c67bf2a45939a4cb
[INFO] running `Command { std: "docker" "start" "-a" "8812337d8089bfeccd291c5ef8e2635a98caac191c584687c67bf2a45939a4cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8812337d8089bfeccd291c5ef8e2635a98caac191c584687c67bf2a45939a4cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8812337d8089bfeccd291c5ef8e2635a98caac191c584687c67bf2a45939a4cb", kill_on_drop: false }`
[INFO] [stdout] 8812337d8089bfeccd291c5ef8e2635a98caac191c584687c67bf2a45939a4cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a520177188e7541e9525bc58522f0faa0d7e7461139a5c0825fba4a715e0e704
[INFO] running `Command { std: "docker" "start" "-a" "a520177188e7541e9525bc58522f0faa0d7e7461139a5c0825fba4a715e0e704", kill_on_drop: false }`
[INFO] [stderr]    Compiling tcp_server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated items `new` and `change_message` are never used
[INFO] [stdout]   --> src/lib.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PoolCreationError {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new() -> PoolCreationError {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn change_message(&mut self, new_message: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]   --> src/lib.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Worker {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 36 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 37 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `threads` is never read
[INFO] [stdout]   --> src/lib.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub struct ThreadPool {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 68 |     threads: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = stream.set_read_timeout(Some(Duration::new(12, 12)));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `Command { std: "docker" "inspect" "a520177188e7541e9525bc58522f0faa0d7e7461139a5c0825fba4a715e0e704", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a520177188e7541e9525bc58522f0faa0d7e7461139a5c0825fba4a715e0e704", kill_on_drop: false }`
[INFO] [stdout] a520177188e7541e9525bc58522f0faa0d7e7461139a5c0825fba4a715e0e704
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 80d837877a56f41b8b192e061c93e60e64e677dbfc3e44f72f82aaed0ea3b65b
[INFO] running `Command { std: "docker" "start" "-a" "80d837877a56f41b8b192e061c93e60e64e677dbfc3e44f72f82aaed0ea3b65b", kill_on_drop: false }`
[INFO] [stderr]    Compiling tcp_server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated items `new` and `change_message` are never used
[INFO] [stdout]   --> src/lib.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PoolCreationError {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new() -> PoolCreationError {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn change_message(&mut self, new_message: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]   --> src/lib.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Worker {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 36 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 37 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `threads` is never read
[INFO] [stdout]   --> src/lib.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub struct ThreadPool {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 68 |     threads: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/main.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let x = stream.set_read_timeout(Some(Duration::new(12, 12)));
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `change_message` are never used
[INFO] [stdout]   --> src/lib.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | impl PoolCreationError {
[INFO] [stdout]    | ---------------------- associated items in this implementation
[INFO] [stdout] 12 |     fn new() -> PoolCreationError {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 17 |     fn change_message(&mut self, new_message: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]   --> src/lib.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub struct Worker {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 36 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 37 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `threads` is never read
[INFO] [stdout]   --> src/lib.rs:68:5
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub struct ThreadPool {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 68 |     threads: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "80d837877a56f41b8b192e061c93e60e64e677dbfc3e44f72f82aaed0ea3b65b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80d837877a56f41b8b192e061c93e60e64e677dbfc3e44f72f82aaed0ea3b65b", kill_on_drop: false }`
[INFO] [stdout] 80d837877a56f41b8b192e061c93e60e64e677dbfc3e44f72f82aaed0ea3b65b