[INFO] updating cached repository https://github.com/sjmann/rust_quiz
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ba945bcb65e3ef430e24aee2b9b7758749e0e656
[INFO] checking sjmann/rust_quiz against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsjmann%2Frust_quiz" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sjmann/rust_quiz on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sjmann/rust_quiz
[INFO] finished tweaking git repo https://github.com/sjmann/rust_quiz
[INFO] tweaked toml for git repo https://github.com/sjmann/rust_quiz written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/sjmann/rust_quiz already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2f50d8a2c2673e643bf8e7a1d95fb0c3d26f3905a6808939c3ca06a7b58c93fb
[INFO] running `"docker" "start" "-a" "2f50d8a2c2673e643bf8e7a1d95fb0c3d26f3905a6808939c3ca06a7b58c93fb"`
[INFO] [stderr]     Checking rust_quiz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: field is never read: `chapter`
[INFO] [stderr]  --> src/io_quiz/question.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     chapter: u8,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `chapter`
[INFO] [stderr]  --> src/io_quiz/question.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 |     chapter: u8,
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `"docker" "inspect" "2f50d8a2c2673e643bf8e7a1d95fb0c3d26f3905a6808939c3ca06a7b58c93fb"`
[INFO] running `"docker" "rm" "-f" "2f50d8a2c2673e643bf8e7a1d95fb0c3d26f3905a6808939c3ca06a7b58c93fb"`
[INFO] [stdout] 2f50d8a2c2673e643bf8e7a1d95fb0c3d26f3905a6808939c3ca06a7b58c93fb