[INFO] cloning repository https://github.com/KvGeijer/skipqueue-fork
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KvGeijer/skipqueue-fork" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKvGeijer%2Fskipqueue-fork", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKvGeijer%2Fskipqueue-fork'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2e0858d8d1a441e6f65db719cd698a1cda2e79dc
[INFO] checking KvGeijer/skipqueue-fork against master#dc375db7d8df0aa450e622c529147c95eee756f5 for pr-156749
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKvGeijer%2Fskipqueue-fork" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KvGeijer/skipqueue-fork
[INFO] finished tweaking git repo https://github.com/KvGeijer/skipqueue-fork
[INFO] tweaked toml for git repo https://github.com/KvGeijer/skipqueue-fork written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KvGeijer/skipqueue-fork on toolchain dc375db7d8df0aa450e622c529147c95eee756f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KvGeijer/skipqueue-fork 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" "+dc375db7d8df0aa450e622c529147c95eee756f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/crossbeam-rs/crossbeam.git`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand v0.10.0
[INFO] [stderr]   Downloaded chacha20 v0.10.0
[INFO] [stderr]   Downloaded cpufeatures v0.3.0
[INFO] [stderr]   Downloaded rand_core v0.10.0
[INFO] [stderr]   Downloaded atomic-maybe-uninit v0.3.15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3e793bdf10248eb2ddbd6b0faebed8155c11b4589982e2893733958d93e8d540" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597
[INFO] running `Command { std: "docker" "start" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597" "/opt/rustwide/cargo-home/bin/cargo" "+dc375db7d8df0aa450e622c529147c95eee756f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling atomic-maybe-uninit v0.3.15
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]    Compiling libc v0.2.182
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]     Checking rand_core v0.10.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.6 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]    Compiling getrandom v0.4.2
[INFO] [stderr]     Checking cpufeatures v0.3.0
[INFO] [stderr]     Checking chacha20 v0.10.0
[INFO] [stderr]     Checking crossbeam-channel v0.5.15 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]     Checking crossbeam-queue v0.3.12 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]     Checking crossbeam v0.8.4 (https://github.com/crossbeam-rs/crossbeam.git#03919fed)
[INFO] [stderr]     Checking rand v0.10.0
[INFO] [stderr]     Checking skipqueue v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `new_node_insert_lock`
[INFO] [stdout]   --> src/skipqueue_mutex.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let new_node_insert_lock =
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_insert_lock`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lock_pred`
[INFO] [stdout]    --> src/skipqueue_mutex.rs:252:30
[INFO] [stdout]     |
[INFO] [stdout] 252 |             let (first_node, lock_pred) =
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lock_pred`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lock_deleted_level`
[INFO] [stdout]    --> src/skipqueue_mutex.rs:256:17
[INFO] [stdout]     |
[INFO] [stdout] 256 |             let lock_deleted_level =
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lock_deleted_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_node_insert_lock`
[INFO] [stdout]   --> src/skipqueue_mutex.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 |         let new_node_insert_lock =
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_node_insert_lock`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lock_pred`
[INFO] [stdout]    --> src/skipqueue_mutex.rs:252:30
[INFO] [stdout]     |
[INFO] [stdout] 252 |             let (first_node, lock_pred) =
[INFO] [stdout]     |                              ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lock_pred`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `lock_deleted_level`
[INFO] [stdout]    --> src/skipqueue_mutex.rs:256:17
[INFO] [stdout]     |
[INFO] [stdout] 256 |             let lock_deleted_level =
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_lock_deleted_level`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.92s
[INFO] running `Command { std: "docker" "inspect" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597", kill_on_drop: false }`
[INFO] [stdout] 2cde81328418a0bd0db15d275f78225970142320dc1d34dee6dc2e3f496fb597