[INFO] fetching crate csv_challenge 0.1.0...
[INFO] checking csv_challenge-0.1.0 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate csv_challenge 0.1.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate csv_challenge 0.1.0 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate csv_challenge 0.1.0
[INFO] finished tweaking crates.io crate csv_challenge 0.1.0
[INFO] tweaked toml for crates.io crate csv_challenge 0.1.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "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] 8f4caa4014ff51ee2676a582621d7a220716f3e06c0ebc4bdff5e02aa0c2d006
[INFO] running `"docker" "start" "-a" "8f4caa4014ff51ee2676a582621d7a220716f3e06c0ebc4bdff5e02aa0c2d006"`
[INFO] [stderr]     Checking csv_challenge v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `filename`
[INFO] [stderr]   --> src/core/read.rs:68:13
[INFO] [stderr]    |
[INFO] [stderr] 68 |         let filename = PathBuf::from("./input/challenge.csv");
[INFO] [stderr]    |             ^^^^^^^^ help: consider prefixing with an underscore: `_filename`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Opt`
[INFO] [stderr]  --> tests/integration_test.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |         Opt,
[INFO] [stderr]   |         ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Opt`
[INFO] [stderr]  --> benches/file_op_bench.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 |     Opt,
[INFO] [stderr]   |     ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> benches/file_op_bench.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     load_csv(filename);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> benches/file_op_bench.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     write_csv(&modified_data, "output/test.csv");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.07s
[INFO] running `"docker" "inspect" "8f4caa4014ff51ee2676a582621d7a220716f3e06c0ebc4bdff5e02aa0c2d006"`
[INFO] running `"docker" "rm" "-f" "8f4caa4014ff51ee2676a582621d7a220716f3e06c0ebc4bdff5e02aa0c2d006"`
[INFO] [stdout] 8f4caa4014ff51ee2676a582621d7a220716f3e06c0ebc4bdff5e02aa0c2d006