[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/beta-1.38-1/sources/1.37.0/gh/bgmarx/recommender"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/bgmarx/recommender'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bgmarx/recommender" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/bgmarx/recommender"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bgmarx/recommender on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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/beta-1.38-1/sources/1.37.0/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/beta-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing bgmarx/recommender against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] f639884cc1d660f52577cb0dad8a8c51e2e2af2ebaa5d527dc9164b6ad2e4f7c
[INFO] running `"docker" "start" "-a" "f639884cc1d660f52577cb0dad8a8c51e2e2af2ebaa5d527dc9164b6ad2e4f7c"`
[INFO] [stderr]    Compiling serde v1.0.70
[INFO] [stderr]    Compiling ndarray v0.11.2
[INFO] [stderr]    Compiling atom v0.3.5
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling want v0.0.4
[INFO] [stderr]    Compiling quote v0.6.5
[INFO] [stderr]    Compiling tokio-io v0.1.7
[INFO] [stderr]    Compiling backtrace-sys v0.1.23
[INFO] [stderr]    Compiling crossbeam-epoch v0.4.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling syn v0.14.7
[INFO] [stderr]    Compiling csv-core v0.1.4
[INFO] [stderr]    Compiling backtrace v0.3.9
[INFO] [stderr]    Compiling mio v0.6.15
[INFO] [stderr]    Compiling crossbeam-deque v0.3.1
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling phf_generator v0.7.22
[INFO] [stderr]    Compiling uuid v0.6.5
[INFO] [stderr]    Compiling tokio-codec v0.1.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.5
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling phf_codegen v0.7.22
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]    Compiling tokio-reactor v0.1.2
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]    Compiling tokio-fs v0.1.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.0
[INFO] [stderr]    Compiling tokio-udp v0.1.1
[INFO] [stderr]    Compiling tokio v0.1.7
[INFO] [stderr]    Compiling synstructure v0.9.0
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]    Compiling failure_derive v0.1.2
[INFO] [stderr]    Compiling hibitset v0.5.1
[INFO] [stderr]    Compiling tokio-tls v0.1.4
[INFO] [stderr]    Compiling hyper v0.11.27
[INFO] [stderr]    Compiling failure v0.1.2
[INFO] [stderr]    Compiling serde_urlencoded v0.5.2
[INFO] [stderr]    Compiling smallvec v0.5.1
[INFO] [stderr]    Compiling serde_json v1.0.24
[INFO] [stderr]    Compiling csv v1.0.0
[INFO] [stderr]    Compiling bincode v0.9.2
[INFO] [stderr]    Compiling hyper-tls v0.1.4
[INFO] [stderr]    Compiling reqwest v0.8.7
[INFO] [stderr]    Compiling rand_core v0.2.1
[INFO] [stderr]    Compiling rand v0.5.4
[INFO] [stderr]    Compiling wyrm v0.9.1
[INFO] [stderr]    Compiling sbr v0.4.0
[INFO] [stderr]    Compiling 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]     Finished dev [unoptimized + debuginfo] target(s) in 2m 09s
[INFO] running `"docker" "inspect" "f639884cc1d660f52577cb0dad8a8c51e2e2af2ebaa5d527dc9164b6ad2e4f7c"`
[INFO] running `"docker" "rm" "-f" "f639884cc1d660f52577cb0dad8a8c51e2e2af2ebaa5d527dc9164b6ad2e4f7c"`
[INFO] [stdout] f639884cc1d660f52577cb0dad8a8c51e2e2af2ebaa5d527dc9164b6ad2e4f7c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 62ea1e3919268e44e04e8c658153cc29531c8ee898f1ad529f2c6efd40e041d9
[INFO] running `"docker" "start" "-a" "62ea1e3919268e44e04e8c658153cc29531c8ee898f1ad529f2c6efd40e041d9"`
[INFO] [stderr]    Compiling 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]     Finished dev [unoptimized + debuginfo] target(s) in 2.45s
[INFO] running `"docker" "inspect" "62ea1e3919268e44e04e8c658153cc29531c8ee898f1ad529f2c6efd40e041d9"`
[INFO] running `"docker" "rm" "-f" "62ea1e3919268e44e04e8c658153cc29531c8ee898f1ad529f2c6efd40e041d9"`
[INFO] [stdout] 62ea1e3919268e44e04e8c658153cc29531c8ee898f1ad529f2c6efd40e041d9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] bbb0db49a87ea79cef4b728d5f92f5a4b3221304c557c7b2999e4434a7fcf673
[INFO] running `"docker" "start" "-a" "bbb0db49a87ea79cef4b728d5f92f5a4b3221304c557c7b2999e4434a7fcf673"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.20s
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/goodbooks_recommender-c4df1d77e851aa01
[INFO] running `"docker" "inspect" "bbb0db49a87ea79cef4b728d5f92f5a4b3221304c557c7b2999e4434a7fcf673"`
[INFO] running `"docker" "rm" "-f" "bbb0db49a87ea79cef4b728d5f92f5a4b3221304c557c7b2999e4434a7fcf673"`
[INFO] [stdout] bbb0db49a87ea79cef4b728d5f92f5a4b3221304c557c7b2999e4434a7fcf673