[INFO] updating cached repository mwalczyk/gray_code_rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mwalczyk/gray_code_rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mwalczyk/gray_code_rs" "work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/gh/mwalczyk/gray_code_rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/gh/mwalczyk/gray_code_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mwalczyk/gray_code_rs" "work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/gh/mwalczyk/gray_code_rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/gh/mwalczyk/gray_code_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5f2f1d79e5be46f0bb24344cc18bdaa3d4d54a2d
[INFO] sha for GitHub repo mwalczyk/gray_code_rs: 5f2f1d79e5be46f0bb24344cc18bdaa3d4d54a2d
[INFO] validating manifest of mwalczyk/gray_code_rs on toolchain master#6ecad338381cc3b8d56e2df22e5971a598eddd6c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mwalczyk/gray_code_rs on toolchain try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f789154f114767b2d0cb9c5b6c592cb3a635e6f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mwalczyk/gray_code_rs
[INFO] finished frobbing mwalczyk/gray_code_rs
[INFO] frobbed toml for mwalczyk/gray_code_rs written to work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/gh/mwalczyk/gray_code_rs/Cargo.toml
[INFO] started frobbing mwalczyk/gray_code_rs
[INFO] finished frobbing mwalczyk/gray_code_rs
[INFO] frobbed toml for mwalczyk/gray_code_rs written to work/ex/pr-57501/sources/try#5f789154f114767b2d0cb9c5b6c592cb3a635e6f/gh/mwalczyk/gray_code_rs/Cargo.toml
[INFO] crate mwalczyk/gray_code_rs has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f789154f114767b2d0cb9c5b6c592cb3a635e6f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking mwalczyk/gray_code_rs against master#6ecad338381cc3b8d56e2df22e5971a598eddd6c for pr-57501
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57501/worker-2/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57501/sources/master#6ecad338381cc3b8d56e2df22e5971a598eddd6c/gh/mwalczyk/gray_code_rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+6ecad338381cc3b8d56e2df22e5971a598eddd6c-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f7aefa4691b78dc063bbcd3c0357c49e1e00c95ed872cfbead2df0b01f972750
[INFO] running `"docker" "start" "-a" "f7aefa4691b78dc063bbcd3c0357c49e1e00c95ed872cfbead2df0b01f972750"`
[INFO] [stderr]     Checking either v1.3.0
[INFO] [stderr]     Checking bitflags v1.0.0
[INFO] [stderr]     Checking rand v0.3.17
[INFO] [stderr]     Checking png v0.11.0
[INFO] [stderr]     Checking coco v0.1.1
[INFO] [stderr]     Checking rayon-core v1.2.1
[INFO] [stderr]     Checking num-bigint v0.1.40
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking num-rational v0.1.39
[INFO] [stderr]     Checking num v0.1.40
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking image v0.17.0
[INFO] [stderr]     Checking rust-test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `orientation`
[INFO] [stderr]   --> src/main.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let orientation = length;
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider using `_orientation` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/main.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |         for (x, y, pixel) in image_buffer.enumerate_pixels_mut() {
[INFO] [stderr]    |                 ^ help: consider using `_y` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `HORIZONTAL`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     HORIZONTAL
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `orientation`
[INFO] [stderr]   --> src/main.rs:31:9
[INFO] [stderr]    |
[INFO] [stderr] 31 |     let orientation = length;
[INFO] [stderr]    |         ^^^^^^^^^^^ help: consider using `_orientation` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]   --> src/main.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |         for (x, y, pixel) in image_buffer.enumerate_pixels_mut() {
[INFO] [stderr]    |                 ^ help: consider using `_y` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `HORIZONTAL`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     HORIZONTAL
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.77s
[INFO] running `"docker" "inspect" "f7aefa4691b78dc063bbcd3c0357c49e1e00c95ed872cfbead2df0b01f972750"`
[INFO] running `"docker" "rm" "-f" "f7aefa4691b78dc063bbcd3c0357c49e1e00c95ed872cfbead2df0b01f972750"`
[INFO] [stdout] f7aefa4691b78dc063bbcd3c0357c49e1e00c95ed872cfbead2df0b01f972750