[INFO] cloning repository https://github.com/MBlev/recommender-system
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MBlev/recommender-system" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMBlev%2Frecommender-system", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMBlev%2Frecommender-system'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c809256445275209400e024d92bf4a3ec72d08e7
[INFO] testing MBlev/recommender-system against try#722e1797249a965b6335aebd65d777f917e498f1 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMBlev%2Frecommender-system" "/workspace/builds/worker-54/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-54/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MBlev/recommender-system on toolchain 722e1797249a965b6335aebd65d777f917e498f1
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MBlev/recommender-system
[INFO] finished tweaking git repo https://github.com/MBlev/recommender-system
[INFO] tweaked toml for git repo https://github.com/MBlev/recommender-system written to /workspace/builds/worker-54/source/Cargo.toml
[INFO] crate git repo https://github.com/MBlev/recommender-system already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded syn v1.0.24
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9a70b07b7271644e20d2f04117ce0482bf68d0e2207a5881cfcd2b99a76aaa4
[INFO] running `Command { std: "docker" "start" "-a" "a9a70b07b7271644e20d2f04117ce0482bf68d0e2207a5881cfcd2b99a76aaa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9a70b07b7271644e20d2f04117ce0482bf68d0e2207a5881cfcd2b99a76aaa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9a70b07b7271644e20d2f04117ce0482bf68d0e2207a5881cfcd2b99a76aaa4", kill_on_drop: false }`
[INFO] [stdout] a9a70b07b7271644e20d2f04117ce0482bf68d0e2207a5881cfcd2b99a76aaa4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d3fd39385b353eae7068f3a67d72e3431b6abd0d9066f3f02420a9ac8f957d59
[INFO] running `Command { std: "docker" "start" "-a" "d3fd39385b353eae7068f3a67d72e3431b6abd0d9066f3f02420a9ac8f957d59", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.17
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling syn v1.0.24
[INFO] [stderr]    Compiling pq-sys v0.4.6
[INFO] [stderr]    Compiling ryu v1.0.4
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling generic_controller v0.1.0 (/opt/rustwide/workdir/generic_controller)
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling quote v1.0.6
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling csv v1.1.3
[INFO] [stderr]    Compiling diesel_derives v1.4.1
[INFO] [stderr]    Compiling diesel v1.4.4
[INFO] [stderr]    Compiling small_movielens_controller v0.1.0 (/opt/rustwide/workdir/specific_controllers/small_movielens_controller)
[INFO] [stderr]    Compiling book_controller v0.1.0 (/opt/rustwide/workdir/specific_controllers/book_controller)
[INFO] [stderr]    Compiling movie_controller v0.1.0 (/opt/rustwide/workdir/specific_controllers/movie_controller)
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> specific_controllers/book_controller/src/b_controller.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<BUser>{
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> specific_controllers/small_movielens_controller/src/sml_controller.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<SMUser>{
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling recommendation-system v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/distances_item.rs:15:14
[INFO] [stdout]    |
[INFO] [stdout] 15 |         for (item, score) in scores {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_user` is never read
[INFO] [stdout]    --> src/movie_api.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut result_user = Vec::new();
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]    --> src/movie_api.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |     let mut result_item = Vec::new();
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user`
[INFO] [stdout]    --> src/movie_api.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 |     for (user, scores) in &all_scores {
[INFO] [stdout]     |          ^^^^ help: if this is intentional, prefix it with an underscore: `_user`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> src/movie_api.rs:227:20
[INFO] [stdout]     |
[INFO] [stdout] 227 |         for (item, score) in scores {
[INFO] [stdout]     |                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `it`
[INFO] [stdout]    --> src/movie_api.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     for it in &items {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_it`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]   --> src/book_api.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let mut result_item = Vec::new();
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]   --> src/small_movielens_api.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut result_item = Vec::new();
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 40.27s
[INFO] running `Command { std: "docker" "inspect" "d3fd39385b353eae7068f3a67d72e3431b6abd0d9066f3f02420a9ac8f957d59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3fd39385b353eae7068f3a67d72e3431b6abd0d9066f3f02420a9ac8f957d59", kill_on_drop: false }`
[INFO] [stdout] d3fd39385b353eae7068f3a67d72e3431b6abd0d9066f3f02420a9ac8f957d59
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 631dd2013d57a3e92c59992abf4d04ca17dd7e8b435b2e56c49db6bd5e6f95fe
[INFO] running `Command { std: "docker" "start" "-a" "631dd2013d57a3e92c59992abf4d04ca17dd7e8b435b2e56c49db6bd5e6f95fe", kill_on_drop: false }`
[INFO] [stderr]    Compiling recommendation-system v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> specific_controllers/small_movielens_controller/src/sml_controller.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<SMUser>{
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> specific_controllers/book_controller/src/b_controller.rs:25:29
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<BUser>{
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `item`
[INFO] [stdout]   --> src/distances_item.rs:15:14
[INFO] [stdout]    |
[INFO] [stdout] 15 |         for (item, score) in scores {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_user` is never read
[INFO] [stdout]    --> src/movie_api.rs:106:13
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut result_user = Vec::new();
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]    --> src/movie_api.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |     let mut result_item = Vec::new();
[INFO] [stdout]     |             ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user`
[INFO] [stdout]    --> src/movie_api.rs:226:10
[INFO] [stdout]     |
[INFO] [stdout] 226 |     for (user, scores) in &all_scores {
[INFO] [stdout]     |          ^^^^ help: if this is intentional, prefix it with an underscore: `_user`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]    --> src/movie_api.rs:227:20
[INFO] [stdout]     |
[INFO] [stdout] 227 |         for (item, score) in scores {
[INFO] [stdout]     |                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `it`
[INFO] [stdout]    --> src/movie_api.rs:238:9
[INFO] [stdout]     |
[INFO] [stdout] 238 |     for it in &items {
[INFO] [stdout]     |         ^^ help: if this is intentional, prefix it with an underscore: `_it`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]   --> src/book_api.rs:65:13
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let mut result_item = Vec::new();
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `result_item` is never read
[INFO] [stdout]   --> src/small_movielens_api.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut result_item = Vec::new();
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `Command { std: "docker" "inspect" "631dd2013d57a3e92c59992abf4d04ca17dd7e8b435b2e56c49db6bd5e6f95fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "631dd2013d57a3e92c59992abf4d04ca17dd7e8b435b2e56c49db6bd5e6f95fe", kill_on_drop: false }`
[INFO] [stdout] 631dd2013d57a3e92c59992abf4d04ca17dd7e8b435b2e56c49db6bd5e6f95fe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+722e1797249a965b6335aebd65d777f917e498f1" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f1ae99bd79dc9615a2d3fdab0893b7113a2f28f77c8f6227068f73a4cf6d5c1f
[INFO] running `Command { std: "docker" "start" "-a" "f1ae99bd79dc9615a2d3fdab0893b7113a2f28f77c8f6227068f73a4cf6d5c1f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> specific_controllers/small_movielens_controller/src/sml_controller.rs:25:29
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<SMUser>{
[INFO] [stderr]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> specific_controllers/book_controller/src/b_controller.rs:25:29
[INFO] [stderr]    |
[INFO] [stderr] 25 |     fn get_user_by_name(&self, name: &str) -> Vec<BUser>{
[INFO] [stderr]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `small_movielens_controller` (lib) generated 1 warning
[INFO] [stderr] warning: `book_controller` (lib) generated 1 warning
[INFO] [stderr] warning: unused variable: `item`
[INFO] [stderr]   --> src/distances_item.rs:15:14
[INFO] [stderr]    |
[INFO] [stderr] 15 |         for (item, score) in scores {
[INFO] [stderr]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result_user` is never read
[INFO] [stderr]    --> src/movie_api.rs:106:13
[INFO] [stderr]     |
[INFO] [stderr] 106 |     let mut result_user = Vec::new();
[INFO] [stderr]     |             ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result_item` is never read
[INFO] [stderr]    --> src/movie_api.rs:124:13
[INFO] [stderr]     |
[INFO] [stderr] 124 |     let mut result_item = Vec::new();
[INFO] [stderr]     |             ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user`
[INFO] [stderr]    --> src/movie_api.rs:226:10
[INFO] [stderr]     |
[INFO] [stderr] 226 |     for (user, scores) in &all_scores {
[INFO] [stderr]     |          ^^^^ help: if this is intentional, prefix it with an underscore: `_user`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `score`
[INFO] [stderr]    --> src/movie_api.rs:227:20
[INFO] [stderr]     |
[INFO] [stderr] 227 |         for (item, score) in scores {
[INFO] [stderr]     |                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `it`
[INFO] [stderr]    --> src/movie_api.rs:238:9
[INFO] [stderr]     |
[INFO] [stderr] 238 |     for it in &items {
[INFO] [stderr]     |         ^^ help: if this is intentional, prefix it with an underscore: `_it`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result_item` is never read
[INFO] [stderr]   --> src/book_api.rs:65:13
[INFO] [stderr]    |
[INFO] [stderr] 65 |     let mut result_item = Vec::new();
[INFO] [stderr]    |             ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `result_item` is never read
[INFO] [stderr]   --> src/small_movielens_api.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let mut result_item = Vec::new();
[INFO] [stderr]    |             ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: `recommendation-system` (bin "recommendation-system" test) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.44s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/recommendation_system-9e0b2299530ebf16)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f1ae99bd79dc9615a2d3fdab0893b7113a2f28f77c8f6227068f73a4cf6d5c1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1ae99bd79dc9615a2d3fdab0893b7113a2f28f77c8f6227068f73a4cf6d5c1f", kill_on_drop: false }`
[INFO] [stdout] f1ae99bd79dc9615a2d3fdab0893b7113a2f28f77c8f6227068f73a4cf6d5c1f