[INFO] cloning repository https://github.com/CampoDiFiori/doubly-linked-list-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CampoDiFiori/doubly-linked-list-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCampoDiFiori%2Fdoubly-linked-list-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCampoDiFiori%2Fdoubly-linked-list-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7cde3edee757ac05d06308fd48385783740f79f6
[INFO] checking CampoDiFiori/doubly-linked-list-rust against master#c5fbcd35a8217a17f6b63a22217ace06cf8f5f02 for pr-86194
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCampoDiFiori%2Fdoubly-linked-list-rust" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CampoDiFiori/doubly-linked-list-rust on toolchain c5fbcd35a8217a17f6b63a22217ace06cf8f5f02
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/CampoDiFiori/doubly-linked-list-rust
[INFO] finished tweaking git repo https://github.com/CampoDiFiori/doubly-linked-list-rust
[INFO] tweaked toml for git repo https://github.com/CampoDiFiori/doubly-linked-list-rust written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/CampoDiFiori/doubly-linked-list-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fba538f7f8d68c78bf48f8fe96f3c35314fd16804e66f57b1d3310b7a94fae36
[INFO] running `Command { std: "docker" "start" "-a" "fba538f7f8d68c78bf48f8fe96f3c35314fd16804e66f57b1d3310b7a94fae36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fba538f7f8d68c78bf48f8fe96f3c35314fd16804e66f57b1d3310b7a94fae36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fba538f7f8d68c78bf48f8fe96f3c35314fd16804e66f57b1d3310b7a94fae36", kill_on_drop: false }`
[INFO] [stdout] fba538f7f8d68c78bf48f8fe96f3c35314fd16804e66f57b1d3310b7a94fae36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+c5fbcd35a8217a17f6b63a22217ace06cf8f5f02" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7bba8d49467ff2e89d50f599824bdb1105d13ea23f0c014b953c6135510f4624
[INFO] running `Command { std: "docker" "start" "-a" "7bba8d49467ff2e89d50f599824bdb1105d13ea23f0c014b953c6135510f4624", kill_on_drop: false }`
[INFO] [stderr]     Checking doubly-linked-list-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `prev`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     prev: Option<NodePtr<T>>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `prev`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     prev: Option<NodePtr<T>>,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "7bba8d49467ff2e89d50f599824bdb1105d13ea23f0c014b953c6135510f4624", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7bba8d49467ff2e89d50f599824bdb1105d13ea23f0c014b953c6135510f4624", kill_on_drop: false }`
[INFO] [stdout] 7bba8d49467ff2e89d50f599824bdb1105d13ea23f0c014b953c6135510f4624