[INFO] cloning repository https://github.com/JGBjork/sololearn-ccoaches-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JGBjork/sololearn-ccoaches-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJGBjork%2Fsololearn-ccoaches-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJGBjork%2Fsololearn-ccoaches-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 785cd281e806c4b987cd620897db4dfb8c77afa8
[INFO] checking JGBjork/sololearn-ccoaches-rust against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJGBjork%2Fsololearn-ccoaches-rust" "/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/JGBjork/sololearn-ccoaches-rust on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JGBjork/sololearn-ccoaches-rust
[INFO] finished tweaking git repo https://github.com/JGBjork/sololearn-ccoaches-rust
[INFO] tweaked toml for git repo https://github.com/JGBjork/sololearn-ccoaches-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/JGBjork/sololearn-ccoaches-rust 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3583afdb53c7ca02a4c6fe20c40a4f9eb6f96efac8ec2cfb2c53ce0fc36ebabe
[INFO] running `Command { std: "docker" "start" "-a" "3583afdb53c7ca02a4c6fe20c40a4f9eb6f96efac8ec2cfb2c53ce0fc36ebabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3583afdb53c7ca02a4c6fe20c40a4f9eb6f96efac8ec2cfb2c53ce0fc36ebabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3583afdb53c7ca02a4c6fe20c40a4f9eb6f96efac8ec2cfb2c53ce0fc36ebabe", kill_on_drop: false }`
[INFO] [stdout] 3583afdb53c7ca02a4c6fe20c40a4f9eb6f96efac8ec2cfb2c53ce0fc36ebabe
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a73edb260f71997c833577d91e54edfd11b671366c635f6864f32de99063a13d
[INFO] running `Command { std: "docker" "start" "-a" "a73edb260f71997c833577d91e54edfd11b671366c635f6864f32de99063a13d", kill_on_drop: false }`
[INFO] [stderr]     Checking sololearn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `safety_deposit_boxes` is never used
[INFO] [stdout]   --> src/code_coaches/medium/safety_deposit_box.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn safety_deposit_boxes(params: &[&str]) -> u32 {
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "a73edb260f71997c833577d91e54edfd11b671366c635f6864f32de99063a13d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a73edb260f71997c833577d91e54edfd11b671366c635f6864f32de99063a13d", kill_on_drop: false }`
[INFO] [stdout] a73edb260f71997c833577d91e54edfd11b671366c635f6864f32de99063a13d