[INFO] cloning repository https://github.com/Qwaz/too-many-lists
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Qwaz/too-many-lists" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQwaz%2Ftoo-many-lists", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQwaz%2Ftoo-many-lists'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6fc2d8674e847616113b382d9015af98c8b31f83
[INFO] checking Qwaz/too-many-lists/6fc2d8674e847616113b382d9015af98c8b31f83 against master#5ad98b4026d5172f27615b105658bc8bfd677be8 for pr-129422
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FQwaz%2Ftoo-many-lists" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Qwaz/too-many-lists on toolchain 5ad98b4026d5172f27615b105658bc8bfd677be8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Qwaz/too-many-lists
[INFO] finished tweaking git repo https://github.com/Qwaz/too-many-lists
[INFO] tweaked toml for git repo https://github.com/Qwaz/too-many-lists written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Qwaz/too-many-lists 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" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0c855c5eff5e9f8d5ff8ce5800797bc11e7a11e8ac6080a548d412cf7d95e3b9
[INFO] running `Command { std: "docker" "start" "-a" "0c855c5eff5e9f8d5ff8ce5800797bc11e7a11e8ac6080a548d412cf7d95e3b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0c855c5eff5e9f8d5ff8ce5800797bc11e7a11e8ac6080a548d412cf7d95e3b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c855c5eff5e9f8d5ff8ce5800797bc11e7a11e8ac6080a548d412cf7d95e3b9", kill_on_drop: false }`
[INFO] [stdout] 0c855c5eff5e9f8d5ff8ce5800797bc11e7a11e8ac6080a548d412cf7d95e3b9
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff1269a11c59442cd561bd2f86311fd53685708d2ba8ca69cb98eec25f1a8584
[INFO] running `Command { std: "docker" "start" "-a" "ff1269a11c59442cd561bd2f86311fd53685708d2ba8ca69cb98eec25f1a8584", kill_on_drop: false }`
[INFO] [stderr]     Checking too-many-lists v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]    --> src/fourth.rs:154:24
[INFO] [stdout]     |
[INFO] [stdout] 154 | pub struct Iter<'a, T>(Option<Ref<'a, Node<T>>>);
[INFO] [stdout]     |            ----        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[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: field `0` is never read
[INFO] [stdout]    --> src/fourth.rs:154:24
[INFO] [stdout]     |
[INFO] [stdout] 154 | pub struct Iter<'a, T>(Option<Ref<'a, Node<T>>>);
[INFO] [stdout]     |            ----        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |            |
[INFO] [stdout]     |            field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider removing this field
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "ff1269a11c59442cd561bd2f86311fd53685708d2ba8ca69cb98eec25f1a8584", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff1269a11c59442cd561bd2f86311fd53685708d2ba8ca69cb98eec25f1a8584", kill_on_drop: false }`
[INFO] [stdout] ff1269a11c59442cd561bd2f86311fd53685708d2ba8ca69cb98eec25f1a8584