[INFO] cloning repository https://github.com/sunflawlxs/advprog-module6
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sunflawlxs/advprog-module6" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunflawlxs%2Fadvprog-module6", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunflawlxs%2Fadvprog-module6'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca5d0d36ee789e87f91f998d8bdbab71a61c633b
[INFO] checking sunflawlxs/advprog-module6 against master#36b21637e93b038453924d3c66821089e71d8baa for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsunflawlxs%2Fadvprog-module6" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sunflawlxs/advprog-module6
[INFO] finished tweaking git repo https://github.com/sunflawlxs/advprog-module6
[INFO] tweaked toml for git repo https://github.com/sunflawlxs/advprog-module6 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sunflawlxs/advprog-module6 on toolchain 36b21637e93b038453924d3c66821089e71d8baa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sunflawlxs/advprog-module6 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" "+36b21637e93b038453924d3c66821089e71d8baa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages to latest compatible versions
[INFO] [stderr]       Adding futures v0.3.31
[INFO] [stderr]       Adding futures-channel v0.3.31
[INFO] [stderr]       Adding futures-core v0.3.31
[INFO] [stderr]       Adding futures-executor v0.3.31
[INFO] [stderr]       Adding futures-io v0.3.31
[INFO] [stderr]       Adding futures-macro v0.3.31
[INFO] [stderr]       Adding futures-sink v0.3.31
[INFO] [stderr]       Adding futures-task v0.3.31
[INFO] [stderr]       Adding futures-util v0.3.31
[INFO] [stderr]       Adding hermit-abi v0.5.2
[INFO] [stderr]       Adding libc v0.2.174
[INFO] [stderr]       Adding memchr v2.7.5
[INFO] [stderr]       Adding num_cpus v1.17.0
[INFO] [stderr]       Adding pin-project-lite v0.2.16
[INFO] [stderr]       Adding pin-utils v0.1.0
[INFO] [stderr]       Adding proc-macro2 v1.0.95
[INFO] [stderr]       Adding quote v1.0.40
[INFO] [stderr]       Adding slab v0.4.10
[INFO] [stderr]       Adding syn v2.0.104
[INFO] [stderr]       Adding unicode-ident v1.0.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad5cfe653c5ccb36fb7363cf2cfbf5aa05c8d49a3811708c9b906e6e5aa7a098
[INFO] running `Command { std: "docker" "start" "-a" "ad5cfe653c5ccb36fb7363cf2cfbf5aa05c8d49a3811708c9b906e6e5aa7a098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad5cfe653c5ccb36fb7363cf2cfbf5aa05c8d49a3811708c9b906e6e5aa7a098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad5cfe653c5ccb36fb7363cf2cfbf5aa05c8d49a3811708c9b906e6e5aa7a098", kill_on_drop: false }`
[INFO] [stdout] ad5cfe653c5ccb36fb7363cf2cfbf5aa05c8d49a3811708c9b906e6e5aa7a098
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bb00ff70af66a7611e6fbd24055b68c12c256f98d1038495479f1b57d6ac3bc3
[INFO] running `Command { std: "docker" "start" "-a" "bb00ff70af66a7611e6fbd24055b68c12c256f98d1038495479f1b57d6ac3bc3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.95
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]     Checking futures-sink v0.3.31
[INFO] [stderr]     Checking futures-core v0.3.31
[INFO] [stderr]     Checking futures-io v0.3.31
[INFO] [stderr]     Checking slab v0.4.10
[INFO] [stderr]     Checking futures-task v0.3.31
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking memchr v2.7.5
[INFO] [stderr]     Checking pin-project-lite v0.2.16
[INFO] [stderr]     Checking futures-channel v0.3.31
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.104
[INFO] [stderr]     Checking num_cpus v1.17.0
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stderr]     Checking hello v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct ThreadPool {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 7 |     workers: Vec<Worker>,
[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:41:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct Worker {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 41 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 42 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]  --> src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct ThreadPool {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 7 |     workers: Vec<Worker>,
[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:41:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | struct Worker {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 41 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 42 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.21s
[INFO] running `Command { std: "docker" "inspect" "bb00ff70af66a7611e6fbd24055b68c12c256f98d1038495479f1b57d6ac3bc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb00ff70af66a7611e6fbd24055b68c12c256f98d1038495479f1b57d6ac3bc3", kill_on_drop: false }`
[INFO] [stdout] bb00ff70af66a7611e6fbd24055b68c12c256f98d1038495479f1b57d6ac3bc3