[INFO] cloning repository https://github.com/itbaiyang/rust-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/itbaiyang/rust-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d30d219e0e460fdcabbf62517b3aba374ef2dfd0
[INFO] checking itbaiyang/rust-book against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitbaiyang%2Frust-book" "/workspace/builds/worker-87/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-87/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/itbaiyang/rust-book on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/itbaiyang/rust-book
[INFO] finished tweaking git repo https://github.com/itbaiyang/rust-book
[INFO] tweaked toml for git repo https://github.com/itbaiyang/rust-book written to /workspace/builds/worker-87/source/Cargo.toml
[INFO] crate git repo https://github.com/itbaiyang/rust-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6f000445588649d0cc00b0a03f026a6d733159232f443bd36bff89c76e580e85
[INFO] running `Command { std: "docker" "start" "-a" "6f000445588649d0cc00b0a03f026a6d733159232f443bd36bff89c76e580e85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6f000445588649d0cc00b0a03f026a6d733159232f443bd36bff89c76e580e85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6f000445588649d0cc00b0a03f026a6d733159232f443bd36bff89c76e580e85", kill_on_drop: false }`
[INFO] [stdout] 6f000445588649d0cc00b0a03f026a6d733159232f443bd36bff89c76e580e85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-87/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" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e7a2b5e86ba50dd2bb9d20ac7609f65fe593da5a8da7fd9ae94c29ea893628b
[INFO] running `Command { std: "docker" "start" "-a" "8e7a2b5e86ba50dd2bb9d20ac7609f65fe593da5a8da7fd9ae94c29ea893628b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]  --> src/struct_m/struct_test.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     id: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `is_good`
[INFO] [stdout]  --> src/struct_m/struct_test.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     is_good: bool
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/t_m/t_test.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/ref_m/tree_list.rs:8:3
[INFO] [stdout]   |
[INFO] [stdout] 8 |   value: i32,
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]   --> src/ref_m/tree_list.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 10 |   children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:39:3
[INFO] [stdout]    |
[INFO] [stdout] 39 |   width: u32,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:40:3
[INFO] [stdout]    |
[INFO] [stdout] 40 |   height: u32,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `label`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:41:3
[INFO] [stdout]    |
[INFO] [stdout] 41 |   label: String,
[INFO] [stdout]    |   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:51:3
[INFO] [stdout]    |
[INFO] [stdout] 51 |   width: u32,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:52:3
[INFO] [stdout]    |
[INFO] [stdout] 52 |   height: u32,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:53:3
[INFO] [stdout]    |
[INFO] [stdout] 53 |   options: Vec<String>,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/advanced_m/unsafe_init.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]  --> src/struct_m/struct_test.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     id: i32,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `is_good`
[INFO] [stdout]  --> src/struct_m/struct_test.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     is_good: bool
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> src/t_m/t_test.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     y: U,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/ref_m/tree_list.rs:8:3
[INFO] [stdout]   |
[INFO] [stdout] 8 |   value: i32,
[INFO] [stdout]   |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]   --> src/ref_m/tree_list.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 10 |   children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:39:3
[INFO] [stdout]    |
[INFO] [stdout] 39 |   width: u32,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:40:3
[INFO] [stdout]    |
[INFO] [stdout] 40 |   height: u32,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `label`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:41:3
[INFO] [stdout]    |
[INFO] [stdout] 41 |   label: String,
[INFO] [stdout]    |   ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:51:3
[INFO] [stdout]    |
[INFO] [stdout] 51 |   width: u32,
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:52:3
[INFO] [stdout]    |
[INFO] [stdout] 52 |   height: u32,
[INFO] [stdout]    |   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]   --> src/oop_m/oop_trait.rs:53:3
[INFO] [stdout]    |
[INFO] [stdout] 53 |   options: Vec<String>,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `split_at_mut`
[INFO] [stdout]   --> src/advanced_m/unsafe_init.rs:58:4
[INFO] [stdout]    |
[INFO] [stdout] 58 | fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.62s
[INFO] running `Command { std: "docker" "inspect" "8e7a2b5e86ba50dd2bb9d20ac7609f65fe593da5a8da7fd9ae94c29ea893628b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e7a2b5e86ba50dd2bb9d20ac7609f65fe593da5a8da7fd9ae94c29ea893628b", kill_on_drop: false }`
[INFO] [stdout] 8e7a2b5e86ba50dd2bb9d20ac7609f65fe593da5a8da7fd9ae94c29ea893628b