[INFO] fetching crate scoped-thread-pool 1.0.4...
[INFO] testing scoped-thread-pool-1.0.4 against try#2440211fe03bc45c89b6dc1a3df18382ce91e32b for pr-146098-1
[INFO] extracting crate scoped-thread-pool 1.0.4 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate scoped-thread-pool 1.0.4
[INFO] finished tweaking crates.io crate scoped-thread-pool 1.0.4
[INFO] tweaked toml for crates.io crate scoped-thread-pool 1.0.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate scoped-thread-pool 1.0.4 on toolchain 2440211fe03bc45c89b6dc1a3df18382ce91e32b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate scoped-thread-pool 1.0.4 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" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6df8a211f8acd5b5f756cb3d5aeba8cb40e3b3439a424fc61dc22c6dc7d170c
[INFO] running `Command { std: "docker" "start" "-a" "c6df8a211f8acd5b5f756cb3d5aeba8cb40e3b3439a424fc61dc22c6dc7d170c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6df8a211f8acd5b5f756cb3d5aeba8cb40e3b3439a424fc61dc22c6dc7d170c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6df8a211f8acd5b5f756cb3d5aeba8cb40e3b3439a424fc61dc22c6dc7d170c", kill_on_drop: false }`
[INFO] [stdout] c6df8a211f8acd5b5f756cb3d5aeba8cb40e3b3439a424fc61dc22c6dc7d170c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c3c86fdda9d1799ece636064d500a594b520436354669c2c617591d182a8bb2d
[INFO] running `Command { std: "docker" "start" "-a" "c3c86fdda9d1799ece636064d500a594b520436354669c2c617591d182a8bb2d", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling memoffset v0.8.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.14
[INFO] [stderr]    Compiling crossbeam-queue v0.3.8
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling variance v0.1.3
[INFO] [stderr]    Compiling crossbeam-channel v0.5.8
[INFO] [stderr]    Compiling crossbeam-deque v0.8.3
[INFO] [stderr]    Compiling crossbeam v0.8.2
[INFO] [stderr]    Compiling scoped-thread-pool v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/lib.rs:510:17
[INFO] [stdout]     |
[INFO] [stdout] 510 | struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout]     |        -------- ^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 510 - struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout] 510 + struct Sentinel((), Option<Arc<WaitGroup>>);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.16s
[INFO] running `Command { std: "docker" "inspect" "c3c86fdda9d1799ece636064d500a594b520436354669c2c617591d182a8bb2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c3c86fdda9d1799ece636064d500a594b520436354669c2c617591d182a8bb2d", kill_on_drop: false }`
[INFO] [stdout] c3c86fdda9d1799ece636064d500a594b520436354669c2c617591d182a8bb2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01a88020fed4dfd7eb95a54c0f61ad38e1a346e10d41a39d6ca9210a013f4758
[INFO] running `Command { std: "docker" "start" "-a" "01a88020fed4dfd7eb95a54c0f61ad38e1a346e10d41a39d6ca9210a013f4758", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/lib.rs:510:17
[INFO] [stdout]     |
[INFO] [stdout] 510 | struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout]     |        -------- ^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 510 - struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout] 510 + struct Sentinel((), Option<Arc<WaitGroup>>);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling scoped-thread-pool v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: field `0` is never read
[INFO] [stdout]    --> src/lib.rs:510:17
[INFO] [stdout]     |
[INFO] [stdout] 510 | struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout]     |        -------- ^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        field in this struct
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:1:24
[INFO] [stdout]     |
[INFO] [stdout]   1 | #![cfg_attr(test, deny(warnings))]
[INFO] [stdout]     |                        ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(dead_code)]` implied by `#[deny(warnings)]`
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 510 - struct Sentinel(Pool, Option<Arc<WaitGroup>>);
[INFO] [stdout] 510 + struct Sentinel((), Option<Arc<WaitGroup>>);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `scoped-thread-pool` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "01a88020fed4dfd7eb95a54c0f61ad38e1a346e10d41a39d6ca9210a013f4758", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01a88020fed4dfd7eb95a54c0f61ad38e1a346e10d41a39d6ca9210a013f4758", kill_on_drop: false }`
[INFO] [stdout] 01a88020fed4dfd7eb95a54c0f61ad38e1a346e10d41a39d6ca9210a013f4758