[INFO] cloning repository https://github.com/tserikawa/algorithm-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tserikawa/algorithm-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftserikawa%2Falgorithm-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftserikawa%2Falgorithm-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 851966dd2e0410227d8a9227089f4b13d0f65600
[INFO] checking tserikawa/algorithm-rs against try#4907eac94165faff6c5e5e015670b1c584275f7b for pr-154149
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftserikawa%2Falgorithm-rs" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tserikawa/algorithm-rs
[INFO] finished tweaking git repo https://github.com/tserikawa/algorithm-rs
[INFO] tweaked toml for git repo https://github.com/tserikawa/algorithm-rs written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tserikawa/algorithm-rs on toolchain 4907eac94165faff6c5e5e015670b1c584275f7b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4907eac94165faff6c5e5e015670b1c584275f7b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tserikawa/algorithm-rs 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" "+4907eac94165faff6c5e5e015670b1c584275f7b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+4907eac94165faff6c5e5e015670b1c584275f7b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9bb15ed2f331308c0622cb560ddc6c007dc0d11458d58c106dc22b88c633a888
[INFO] running `Command { std: "docker" "start" "-a" "9bb15ed2f331308c0622cb560ddc6c007dc0d11458d58c106dc22b88c633a888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9bb15ed2f331308c0622cb560ddc6c007dc0d11458d58c106dc22b88c633a888", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bb15ed2f331308c0622cb560ddc6c007dc0d11458d58c106dc22b88c633a888", kill_on_drop: false }`
[INFO] [stdout] 9bb15ed2f331308c0622cb560ddc6c007dc0d11458d58c106dc22b88c633a888
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+4907eac94165faff6c5e5e015670b1c584275f7b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e30f0ac8172ec7d622ef3850a59bd1c176afd198a2fed69beb33319d75c0d730
[INFO] running `Command { std: "docker" "start" "-a" "e30f0ac8172ec7d622ef3850a59bd1c176afd198a2fed69beb33319d75c0d730", kill_on_drop: false }`
[INFO] [stderr]     Checking link_list v0.1.0 (/opt/rustwide/workdir/crates/link_list)
[INFO] [stdout] warning: unused import: `std::env::current_exe`
[INFO] [stdout]  --> crates/link_list/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::env::current_exe;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env::current_exe`
[INFO] [stdout]  --> crates/link_list/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::env::current_exe;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `current` is never read
[INFO] [stdout]   --> crates/link_list/src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct LinkList<T> {
[INFO] [stdout]    |            -------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 15 |     current: Option<Box<Node<T>>>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "e30f0ac8172ec7d622ef3850a59bd1c176afd198a2fed69beb33319d75c0d730", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e30f0ac8172ec7d622ef3850a59bd1c176afd198a2fed69beb33319d75c0d730", kill_on_drop: false }`
[INFO] [stdout] e30f0ac8172ec7d622ef3850a59bd1c176afd198a2fed69beb33319d75c0d730