[INFO] cloning repository https://github.com/LukeDowell/thebook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LukeDowell/thebook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeDowell%2Fthebook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeDowell%2Fthebook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f731e0266d0729f93c968dcfcd98b5fd3fbe1af9
[INFO] testing LukeDowell/thebook against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLukeDowell%2Fthebook" "/workspace/builds/worker-49/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-49/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/LukeDowell/thebook on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/LukeDowell/thebook
[INFO] finished tweaking git repo https://github.com/LukeDowell/thebook
[INFO] tweaked toml for git repo https://github.com/LukeDowell/thebook written to /workspace/builds/worker-49/source/Cargo.toml
[INFO] crate git repo https://github.com/LukeDowell/thebook already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a40d6ad88109269cdd3dd6dfab30dab78ac3c4d0596307d3a6a92febb6f48ab8
[INFO] running `Command { std: "docker" "start" "-a" "a40d6ad88109269cdd3dd6dfab30dab78ac3c4d0596307d3a6a92febb6f48ab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a40d6ad88109269cdd3dd6dfab30dab78ac3c4d0596307d3a6a92febb6f48ab8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a40d6ad88109269cdd3dd6dfab30dab78ac3c4d0596307d3a6a92febb6f48ab8", kill_on_drop: false }`
[INFO] [stdout] a40d6ad88109269cdd3dd6dfab30dab78ac3c4d0596307d3a6a92febb6f48ab8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b195490c88f9cb685fc94139ef60e4592e42925f380c12b39604d44f80ad87f
[INFO] running `Command { std: "docker" "start" "-a" "3b195490c88f9cb685fc94139ef60e4592e42925f380c12b39604d44f80ad87f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling getrandom v0.2.1
[INFO] [stderr]    Compiling rand_core v0.6.1
[INFO] [stderr]    Compiling rand_chacha v0.3.0
[INFO] [stderr]    Compiling rand v0.8.2
[INFO] [stderr]    Compiling thebook v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let s = "hello"; // s is valid from this point forward
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/ownership.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let len = calculate_length(&s1);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len2`
[INFO] [stdout]   --> src/ownership.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let len2 = legal_calculate_length(&mut s2);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_len2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let r1 = &mut s2;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]  --> src/slice.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let word = first_word(&s);
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/slice.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let hello = &string_slice[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/slice.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let world = &string_slice[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user2`
[INFO] [stdout]   --> src/structs.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let user2 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/ownership.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/ownership.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `legal_calculate_length`
[INFO] [stdout]   --> src/ownership.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn legal_calculate_length(s: &mut String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/guessing_game.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/slice.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]   --> src/slice.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word_slice`
[INFO] [stdout]   --> src/slice.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn first_word_slice(s: &String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]  --> src/structs.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         name: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn build_user(name: String) -> User {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Validated`
[INFO] [stdout]   --> src/structs.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     struct Validated;
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]   --> src/structs.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn area(r: Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 19s
[INFO] running `Command { std: "docker" "inspect" "3b195490c88f9cb685fc94139ef60e4592e42925f380c12b39604d44f80ad87f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b195490c88f9cb685fc94139ef60e4592e42925f380c12b39604d44f80ad87f", kill_on_drop: false }`
[INFO] [stdout] 3b195490c88f9cb685fc94139ef60e4592e42925f380c12b39604d44f80ad87f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 604a600fd87241ae3d622f626f3b5e127af4b0785c493c155565c06762c25d88
[INFO] running `Command { std: "docker" "start" "-a" "604a600fd87241ae3d622f626f3b5e127af4b0785c493c155565c06762c25d88", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling thebook v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:11:13
[INFO] [stdout]    |
[INFO] [stdout] 11 |         let s = "hello"; // s is valid from this point forward
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/ownership.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let len = calculate_length(&s1);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len2`
[INFO] [stdout]   --> src/ownership.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let len2 = legal_calculate_length(&mut s2);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_len2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/ownership.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let r1 = &mut s2;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]  --> src/slice.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let word = first_word(&s);
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/slice.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let hello = &string_slice[0..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/slice.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let world = &string_slice[6..11];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user2`
[INFO] [stdout]   --> src/structs.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let user2 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/structs.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let black = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/ownership.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/ownership.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `legal_calculate_length`
[INFO] [stdout]   --> src/ownership.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn legal_calculate_length(s: &mut String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/guessing_game.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `run`
[INFO] [stdout]  --> src/slice.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]   --> src/slice.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word_slice`
[INFO] [stdout]   --> src/slice.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn first_word_slice(s: &String) -> &str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]  --> src/structs.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |         name: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/structs.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 |     fn build_user(name: String) -> User {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Validated`
[INFO] [stdout]   --> src/structs.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 33 |     struct Validated;
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]   --> src/structs.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn area(r: Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 20 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.77s
[INFO] running `Command { std: "docker" "inspect" "604a600fd87241ae3d622f626f3b5e127af4b0785c493c155565c06762c25d88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "604a600fd87241ae3d622f626f3b5e127af4b0785c493c155565c06762c25d88", kill_on_drop: false }`
[INFO] [stdout] 604a600fd87241ae3d622f626f3b5e127af4b0785c493c155565c06762c25d88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-49/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2926d72c688907e5fc7bfbf2f45db38cf8f07ffb1d75c313957b65c9abdcf6b2
[INFO] running `Command { std: "docker" "start" "-a" "2926d72c688907e5fc7bfbf2f45db38cf8f07ffb1d75c313957b65c9abdcf6b2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/ownership.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let s = "hello"; // s is valid from this point forward
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `len`
[INFO] [stderr]   --> src/ownership.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let len = calculate_length(&s1);
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `len2`
[INFO] [stderr]   --> src/ownership.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let len2 = legal_calculate_length(&mut s2);
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_len2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> src/ownership.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let r1 = &mut s2;
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `word`
[INFO] [stderr]  --> src/slice.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let word = first_word(&s);
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello`
[INFO] [stderr]   --> src/slice.rs:12:9
[INFO] [stderr]    |
[INFO] [stderr] 12 |     let hello = &string_slice[0..5];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `world`
[INFO] [stderr]   --> src/slice.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let world = &string_slice[6..11];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `user2`
[INFO] [stderr]   --> src/structs.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let user2 = User {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/structs.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let black = Color(0, 0, 0);
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/ownership.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn run() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calculate_length`
[INFO] [stderr]   --> src/ownership.rs:40:4
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn calculate_length(s: &String) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `legal_calculate_length`
[INFO] [stderr]   --> src/ownership.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn legal_calculate_length(s: &mut String) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/guessing_game.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn run() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `run`
[INFO] [stderr]  --> src/slice.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn run() {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]   --> src/slice.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn first_word(s: &String) -> usize {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word_slice`
[INFO] [stderr]   --> src/slice.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn first_word_slice(s: &String) -> &str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]  --> src/structs.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |         name: String,
[INFO] [stderr]   |         ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `build_user`
[INFO] [stderr]   --> src/structs.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn build_user(name: String) -> User {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Validated`
[INFO] [stderr]   --> src/structs.rs:33:12
[INFO] [stderr]    |
[INFO] [stderr] 33 |     struct Validated;
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `area`
[INFO] [stderr]   --> src/structs.rs:53:4
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn area(r: Rectangle) -> u32 {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `thebook` (bin "thebook" test) generated 20 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.51s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/thebook-3c1ef72033bb23a5)
[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" "2926d72c688907e5fc7bfbf2f45db38cf8f07ffb1d75c313957b65c9abdcf6b2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2926d72c688907e5fc7bfbf2f45db38cf8f07ffb1d75c313957b65c9abdcf6b2", kill_on_drop: false }`
[INFO] [stdout] 2926d72c688907e5fc7bfbf2f45db38cf8f07ffb1d75c313957b65c9abdcf6b2