[INFO] updating cached repository aleph-naught2tog/rust_exercises
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aleph-naught2tog/rust_exercises
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aleph-naught2tog/rust_exercises" "work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/aleph-naught2tog/rust_exercises"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/aleph-naught2tog/rust_exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aleph-naught2tog/rust_exercises" "work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/aleph-naught2tog/rust_exercises"`
[INFO] [stderr] Cloning into 'work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/aleph-naught2tog/rust_exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4c595198a84b111baf86c5b36d3b0ec1a2c958ff
[INFO] sha for GitHub repo aleph-naught2tog/rust_exercises: 4c595198a84b111baf86c5b36d3b0ec1a2c958ff
[INFO] validating manifest of aleph-naught2tog/rust_exercises on toolchain master#39401465da4ce27aeeb2c2a26133ac35c63aa515
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of aleph-naught2tog/rust_exercises on toolchain try#f45cc3094ee337acd688771b9234318046b0572d
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing aleph-naught2tog/rust_exercises
[INFO] finished frobbing aleph-naught2tog/rust_exercises
[INFO] frobbed toml for aleph-naught2tog/rust_exercises written to work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/aleph-naught2tog/rust_exercises/Cargo.toml
[INFO] started frobbing aleph-naught2tog/rust_exercises
[INFO] finished frobbing aleph-naught2tog/rust_exercises
[INFO] frobbed toml for aleph-naught2tog/rust_exercises written to work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/gh/aleph-naught2tog/rust_exercises/Cargo.toml
[INFO] crate aleph-naught2tog/rust_exercises already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking aleph-naught2tog/rust_exercises against master#39401465da4ce27aeeb2c2a26133ac35c63aa515 for pr-60914
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60914/worker-4/master#39401465da4ce27aeeb2c2a26133ac35c63aa515:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/gh/aleph-naught2tog/rust_exercises:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 306305c1095b05b61dcea70d19ea4d9334075733845b1a43985bf384fcb7d09a
[INFO] running `"docker" "start" "-a" "306305c1095b05b61dcea70d19ea4d9334075733845b1a43985bf384fcb7d09a"`
[INFO] [stderr]     Checking exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/parser.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::trim_rgb`
[INFO] [stderr]   --> src/parser.rs:73:7
[INFO] [stderr]    |
[INFO] [stderr] 73 |   use super::trim_rgb;
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/parser.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `"docker" "inspect" "306305c1095b05b61dcea70d19ea4d9334075733845b1a43985bf384fcb7d09a"`
[INFO] running `"docker" "rm" "-f" "306305c1095b05b61dcea70d19ea4d9334075733845b1a43985bf384fcb7d09a"`
[INFO] [stdout] 306305c1095b05b61dcea70d19ea4d9334075733845b1a43985bf384fcb7d09a