[INFO] updating cached repository VaclavStebra/rust-book-references-and-borrowing
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/VaclavStebra/rust-book-references-and-borrowing
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/VaclavStebra/rust-book-references-and-borrowing" "work/ex/pr-60466/sources/master#7840a0b753a065a41999f1fb6028f67d33e3fdd5/gh/VaclavStebra/rust-book-references-and-borrowing"`
[INFO] [stderr] Cloning into 'work/ex/pr-60466/sources/master#7840a0b753a065a41999f1fb6028f67d33e3fdd5/gh/VaclavStebra/rust-book-references-and-borrowing'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/VaclavStebra/rust-book-references-and-borrowing" "work/ex/pr-60466/sources/try#6a9f0b6cc40687e25f9d772e3b10bab335c63853/gh/VaclavStebra/rust-book-references-and-borrowing"`
[INFO] [stderr] Cloning into 'work/ex/pr-60466/sources/try#6a9f0b6cc40687e25f9d772e3b10bab335c63853/gh/VaclavStebra/rust-book-references-and-borrowing'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6a69d6a3a909d36b8b69bc865641a6b3053066d0
[INFO] sha for GitHub repo VaclavStebra/rust-book-references-and-borrowing: 6a69d6a3a909d36b8b69bc865641a6b3053066d0
[INFO] validating manifest of VaclavStebra/rust-book-references-and-borrowing on toolchain master#7840a0b753a065a41999f1fb6028f67d33e3fdd5
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+7840a0b753a065a41999f1fb6028f67d33e3fdd5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of VaclavStebra/rust-book-references-and-borrowing on toolchain try#6a9f0b6cc40687e25f9d772e3b10bab335c63853
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+6a9f0b6cc40687e25f9d772e3b10bab335c63853-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing VaclavStebra/rust-book-references-and-borrowing
[INFO] finished frobbing VaclavStebra/rust-book-references-and-borrowing
[INFO] frobbed toml for VaclavStebra/rust-book-references-and-borrowing written to work/ex/pr-60466/sources/master#7840a0b753a065a41999f1fb6028f67d33e3fdd5/gh/VaclavStebra/rust-book-references-and-borrowing/Cargo.toml
[INFO] started frobbing VaclavStebra/rust-book-references-and-borrowing
[INFO] finished frobbing VaclavStebra/rust-book-references-and-borrowing
[INFO] frobbed toml for VaclavStebra/rust-book-references-and-borrowing written to work/ex/pr-60466/sources/try#6a9f0b6cc40687e25f9d772e3b10bab335c63853/gh/VaclavStebra/rust-book-references-and-borrowing/Cargo.toml
[INFO] crate VaclavStebra/rust-book-references-and-borrowing already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+7840a0b753a065a41999f1fb6028f67d33e3fdd5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+6a9f0b6cc40687e25f9d772e3b10bab335c63853-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking VaclavStebra/rust-book-references-and-borrowing against try#6a9f0b6cc40687e25f9d772e3b10bab335c63853 for pr-60466
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60466/worker-6/try#6a9f0b6cc40687e25f9d772e3b10bab335c63853:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60466/sources/try#6a9f0b6cc40687e25f9d772e3b10bab335c63853/gh/VaclavStebra/rust-book-references-and-borrowing:/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" "+6a9f0b6cc40687e25f9d772e3b10bab335c63853-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c6f53f81ccd05dc3bff8f4d81d1e4777efd24bed41b7cba190165292137a4f13
[INFO] running `"docker" "start" "-a" "c6f53f81ccd05dc3bff8f4d81d1e4777efd24bed41b7cba190165292137a4f13"`
[INFO] [stderr]     Checking rust-book-references-and-borrowing v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let r1 = &mut s2;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let r1 = &mut s2;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_r1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `"docker" "inspect" "c6f53f81ccd05dc3bff8f4d81d1e4777efd24bed41b7cba190165292137a4f13"`
[INFO] running `"docker" "rm" "-f" "c6f53f81ccd05dc3bff8f4d81d1e4777efd24bed41b7cba190165292137a4f13"`
[INFO] [stdout] c6f53f81ccd05dc3bff8f4d81d1e4777efd24bed41b7cba190165292137a4f13