[INFO] fetching crate thread_pool_pre 0.1.0...
[INFO] checking thread_pool_pre-0.1.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate thread_pool_pre 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate thread_pool_pre 0.1.0
[INFO] finished tweaking crates.io crate thread_pool_pre 0.1.0
[INFO] tweaked toml for crates.io crate thread_pool_pre 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate thread_pool_pre 0.1.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate thread_pool_pre 0.1.0 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4bace07bd4d964f59365088001a1f4b7dc15df9e781b57f8f77438d65dc692de
[INFO] running `Command { std: "docker" "start" "-a" "4bace07bd4d964f59365088001a1f4b7dc15df9e781b57f8f77438d65dc692de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4bace07bd4d964f59365088001a1f4b7dc15df9e781b57f8f77438d65dc692de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bace07bd4d964f59365088001a1f4b7dc15df9e781b57f8f77438d65dc692de", kill_on_drop: false }`
[INFO] [stdout] 4bace07bd4d964f59365088001a1f4b7dc15df9e781b57f8f77438d65dc692de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 143231f2a70b04a71745499dda49cb7d2b77c9027b7d00746261a9f304599233
[INFO] running `Command { std: "docker" "start" "-a" "143231f2a70b04a71745499dda49cb7d2b77c9027b7d00746261a9f304599233", kill_on_drop: false }`
[INFO] [stderr]     Checking thread_pool_pre v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct ThreadPool{
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 15 |     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:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Worker{
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 40 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 41 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]   --> src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct ThreadPool{
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] 15 |     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:40:5
[INFO] [stdout]    |
[INFO] [stdout] 39 | struct Worker{
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 40 |     id: usize,
[INFO] [stdout]    |     ^^
[INFO] [stdout] 41 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `Command { std: "docker" "inspect" "143231f2a70b04a71745499dda49cb7d2b77c9027b7d00746261a9f304599233", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "143231f2a70b04a71745499dda49cb7d2b77c9027b7d00746261a9f304599233", kill_on_drop: false }`
[INFO] [stdout] 143231f2a70b04a71745499dda49cb7d2b77c9027b7d00746261a9f304599233