[INFO] updating cached repository bgmarx/recommender
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bgmarx/recommender
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bgmarx/recommender" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/bgmarx/recommender"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/bgmarx/recommender'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bgmarx/recommender" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/bgmarx/recommender"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/bgmarx/recommender'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db93a013d779f4cbfc6146ebca9045c0f19a84c4
[INFO] sha for GitHub repo bgmarx/recommender: db93a013d779f4cbfc6146ebca9045c0f19a84c4
[INFO] validating manifest of bgmarx/recommender on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bgmarx/recommender on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bgmarx/recommender
[INFO] finished frobbing bgmarx/recommender
[INFO] frobbed toml for bgmarx/recommender written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/bgmarx/recommender/Cargo.toml
[INFO] started frobbing bgmarx/recommender
[INFO] finished frobbing bgmarx/recommender
[INFO] frobbed toml for bgmarx/recommender written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/bgmarx/recommender/Cargo.toml
[INFO] crate bgmarx/recommender already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking bgmarx/recommender against master#452087b4bf18cece2d52d7cd8c9147195e5404bf for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-3/master#452087b4bf18cece2d52d7cd8c9147195e5404bf:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/bgmarx/recommender:/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" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e34ad0bbe826c46976fc58a827c5de671b4c2b75c8e8dbd78e7ae73127dbe755
[INFO] running `"docker" "start" "-a" "e34ad0bbe826c46976fc58a827c5de671b4c2b75c8e8dbd78e7ae73127dbe755"`
[INFO] [stderr]    Compiling ndarray v0.11.2
[INFO] [stderr]    Compiling openssl-sys v0.9.35
[INFO] [stderr]    Compiling syn v0.14.7
[INFO] [stderr]     Checking smallvec v0.5.1
[INFO] [stderr]     Checking bincode v0.9.2
[INFO] [stderr]     Checking csv v1.0.0
[INFO] [stderr]    Compiling phf_generator v0.7.22
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]    Compiling phf_codegen v0.7.22
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking rayon v1.0.2
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]    Compiling openssl v0.9.24
[INFO] [stderr]     Checking hyper v0.11.27
[INFO] [stderr]     Checking hibitset v0.5.1
[INFO] [stderr]     Checking native-tls v0.1.5
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]     Checking tokio-tls v0.1.4
[INFO] [stderr]     Checking hyper-tls v0.1.4
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]     Checking reqwest v0.8.7
[INFO] [stderr]     Checking failure v0.1.2
[INFO] [stderr]     Checking rand_core v0.2.1
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]     Checking wyrm v0.9.1
[INFO] [stderr]     Checking sbr v0.4.0
[INFO] [stderr]     Checking goodbooks-recommender v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `title_to_id`
[INFO] [stderr]    --> src/main.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 |          title_to_id) = deserialize_books(books_path).unwrap();
[INFO] [stderr]     |          ^^^^^^^^^^^ help: consider prefixing with an underscore: `_title_to_id`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `title_to_id`
[INFO] [stderr]    --> src/main.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 |          title_to_id) = deserialize_books(books_path).unwrap();
[INFO] [stderr]     |          ^^^^^^^^^^^ help: consider prefixing with an underscore: `_title_to_id`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 21s
[INFO] running `"docker" "inspect" "e34ad0bbe826c46976fc58a827c5de671b4c2b75c8e8dbd78e7ae73127dbe755"`
[INFO] running `"docker" "rm" "-f" "e34ad0bbe826c46976fc58a827c5de671b4c2b75c8e8dbd78e7ae73127dbe755"`
[INFO] [stdout] e34ad0bbe826c46976fc58a827c5de671b4c2b75c8e8dbd78e7ae73127dbe755