[INFO] cloning repository https://github.com/rust-lang-uz/comprehensive-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rust-lang-uz/comprehensive-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang-uz%2Fcomprehensive-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang-uz%2Fcomprehensive-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1995260c9b4a48d8d4da77fbc31f23f69a9ace34
[INFO] testing rust-lang-uz/comprehensive-rust against beta-2025-04-13 for beta-1.87-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang-uz%2Fcomprehensive-rust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rust-lang-uz/comprehensive-rust on toolchain beta-2025-04-13
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-04-13" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rust-lang-uz/comprehensive-rust
[INFO] finished tweaking git repo https://github.com/rust-lang-uz/comprehensive-rust
[INFO] tweaked toml for git repo https://github.com/rust-lang-uz/comprehensive-rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/rust-lang-uz/comprehensive-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-04-13" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-04-13" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6763e16bf1f34968b60a3e4bcf702fdb209cc8cf30c8d58231c725878871ab9b
[INFO] running `Command { std: "docker" "start" "-a" "6763e16bf1f34968b60a3e4bcf702fdb209cc8cf30c8d58231c725878871ab9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6763e16bf1f34968b60a3e4bcf702fdb209cc8cf30c8d58231c725878871ab9b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6763e16bf1f34968b60a3e4bcf702fdb209cc8cf30c8d58231c725878871ab9b", kill_on_drop: false }`
[INFO] [stdout] 6763e16bf1f34968b60a3e4bcf702fdb209cc8cf30c8d58231c725878871ab9b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-04-13" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8af8a54aa1eb09bf06d0aa570f2f38d2cf1a2f62ab9b5068c32f93cf9e7346f8
[INFO] running `Command { std: "docker" "start" "-a" "8af8a54aa1eb09bf06d0aa570f2f38d2cf1a2f62ab9b5068c32f93cf9e7346f8", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
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[INFO] [stderr]    Compiling anstream v0.2.6
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[INFO] [stderr]    Compiling clap_builder v4.2.1
[INFO] [stderr]    Compiling tokio-macros v2.1.0
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[INFO] [stderr]    Compiling openssl-macros v0.1.1
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[INFO] [stderr]    Compiling pin-project-internal v1.0.12
[INFO] [stderr]    Compiling pretty_env_logger v0.4.0
[INFO] [stderr]    Compiling zerocopy-derive v0.3.2
[INFO] [stderr]    Compiling phf v0.10.1
[INFO] [stderr]    Compiling pin-project v1.0.12
[INFO] [stderr]    Compiling pest v2.5.7
[INFO] [stderr]    Compiling tungstenite v0.18.0
[INFO] [stderr]    Compiling zerocopy v0.6.1
[INFO] [stderr]    Compiling clap v4.2.1
[INFO] [stderr]    Compiling clap_complete v4.2.0
[INFO] [stderr]    Compiling zerocopy-example v0.1.0 (/opt/rustwide/workdir/src/bare-metal/useful-crates/zerocopy-example)
[INFO] [stdout] warning: variant `Out` is never constructed
[INFO] [stdout]   --> src/bare-metal/useful-crates/zerocopy-example/src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum RequestType {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 23 |     Out = 1,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling pest_meta v2.5.7
[INFO] [stderr]    Compiling pest_generator v2.5.7
[INFO] [stderr]    Compiling pest_derive v2.5.7
[INFO] [stderr]    Compiling tokio-util v0.7.7
[INFO] [stderr]    Compiling tokio-native-tls v0.3.1
[INFO] [stderr]    Compiling tokio-stream v0.1.12
[INFO] [stderr]    Compiling tokio-tungstenite v0.18.0
[INFO] [stderr]    Compiling h2 v0.3.17
[INFO] [stderr]    Compiling tokio-websockets v0.3.2
[INFO] [stderr]    Compiling chat-async v0.1.0 (/opt/rustwide/workdir/src/exercises/concurrency/chat-async)
[INFO] [stderr]    Compiling string_cache v0.8.7
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling toml v0.5.11
[INFO] [stderr]    Compiling handlebars v4.3.6
[INFO] [stderr]    Compiling elasticlunr-rs v3.0.2
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[INFO] [stderr]    Compiling hyper v0.14.25
[INFO] [stderr]    Compiling hyper-tls v0.5.0
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[INFO] [stderr]    Compiling reqwest v0.11.16
[INFO] [stderr]    Compiling mdbook v0.4.28
[INFO] [stderr]    Compiling comprehensive-rust v0.1.0 (/opt/rustwide/workdir/src/exercises)
[INFO] [stdout] warning: unused variable: `library`
[INFO] [stdout]    --> src/exercises/day-1/book-library.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let library = Library::new();
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_library`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `callback` is never read
[INFO] [stdout]   --> src/exercises/day-3/simple-gui.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Button {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 44 |     label: Label,
[INFO] [stdout] 45 |     callback: Box<dyn FnMut()>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/exercises/concurrency/dining-philosophers.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let left = self.left_fork.lock().unwrap();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `books` is never read
[INFO] [stdout]   --> src/exercises/day-1/book-library.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Library {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] 17 |     books: Vec<Book>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `title` and `year` are never read
[INFO] [stdout]   --> src/exercises/day-1/book-library.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | struct Book {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 21 |     title: String,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 22 |     year: u16,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/exercises/day-1/book-library.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | impl Book {
[INFO] [stdout]    | --------- associated function in this implementation
[INFO] [stdout] 26 |     // This is a constructor, used below.
[INFO] [stdout] 27 |     fn new(title: &str, year: u16) -> Book {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `len`, `is_empty`, `add_book`, `print_books`, and `oldest_book` are never used
[INFO] [stdout]   --> src/exercises/day-1/book-library.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl Library {
[INFO] [stdout]    | ------------ methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 55 |     fn len(&self) -> usize {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 64 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 73 |     fn add_book(&mut self, book: Book) {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 82 |     fn print_books(&self) {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 93 |     fn oldest_book(&self) -> Option<&Book> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/exercises/concurrency/dining-philosophers.rs:44:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let right = self.right_fork.lock().unwrap();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling mdbook-exerciser v0.1.0 (/opt/rustwide/workdir/mdbook-exerciser)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 26s
[INFO] running `Command { std: "docker" "inspect" "8af8a54aa1eb09bf06d0aa570f2f38d2cf1a2f62ab9b5068c32f93cf9e7346f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8af8a54aa1eb09bf06d0aa570f2f38d2cf1a2f62ab9b5068c32f93cf9e7346f8", kill_on_drop: false }`
[INFO] [stdout] 8af8a54aa1eb09bf06d0aa570f2f38d2cf1a2f62ab9b5068c32f93cf9e7346f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-04-13" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2238febdfd9ce647a67470cad6d60843997d03bdf00571eadee1f8a63a7cc322
[INFO] running `Command { std: "docker" "start" "-a" "2238febdfd9ce647a67470cad6d60843997d03bdf00571eadee1f8a63a7cc322", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling comprehensive-rust v0.1.0 (/opt/rustwide/workdir/src/exercises)
[INFO] [stderr]    Compiling allocator-example v0.1.0 (/opt/rustwide/workdir/src/bare-metal/useful-crates/allocator-example)
[INFO] [stderr]    Compiling chat-async v0.1.0 (/opt/rustwide/workdir/src/exercises/concurrency/chat-async)
[INFO] [stderr]    Compiling zerocopy-example v0.1.0 (/opt/rustwide/workdir/src/bare-metal/useful-crates/zerocopy-example)
[INFO] [stderr]    Compiling mdbook-exerciser v0.1.0 (/opt/rustwide/workdir/mdbook-exerciser)
[INFO] [stdout] warning: unused variable: `library`
[INFO] [stdout]    --> src/exercises/day-1/book-library.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 115 |     let library = Library::new();
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_library`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/exercises/concurrency/dining-philosophers.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |         let left = self.left_fork.lock().unwrap();
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/exercises/concurrency/dining-philosophers.rs:44:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |         let right = self.right_fork.lock().unwrap();
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Out` is never constructed
[INFO] [stdout]   --> src/bare-metal/useful-crates/zerocopy-example/src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | enum RequestType {
[INFO] [stdout]    |      ----------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 23 |     Out = 1,
[INFO] [stdout]    |     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `RequestType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `callback` is never read
[INFO] [stdout]   --> src/exercises/day-3/simple-gui.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct Button {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] 44 |     label: Label,
[INFO] [stdout] 45 |     callback: Box<dyn FnMut()>,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.41s
[INFO] running `Command { std: "docker" "inspect" "2238febdfd9ce647a67470cad6d60843997d03bdf00571eadee1f8a63a7cc322", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2238febdfd9ce647a67470cad6d60843997d03bdf00571eadee1f8a63a7cc322", kill_on_drop: false }`
[INFO] [stdout] 2238febdfd9ce647a67470cad6d60843997d03bdf00571eadee1f8a63a7cc322
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-04-13" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 36206fab50f24e9f91ac9bb9f62f42c56eeab82e150c20ea47c25007c8a1d605
[INFO] running `Command { std: "docker" "start" "-a" "36206fab50f24e9f91ac9bb9f62f42c56eeab82e150c20ea47c25007c8a1d605", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: field `callback` is never read
[INFO] [stderr]   --> src/exercises/day-3/simple-gui.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub struct Button {
[INFO] [stderr]    |            ------ field in this struct
[INFO] [stderr] 44 |     label: Label,
[INFO] [stderr] 45 |     callback: Box<dyn FnMut()>,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `left`
[INFO] [stderr]   --> src/exercises/concurrency/dining-philosophers.rs:43:13
[INFO] [stderr]    |
[INFO] [stderr] 43 |         let left = self.left_fork.lock().unwrap();
[INFO] [stderr]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `right`
[INFO] [stderr]   --> src/exercises/concurrency/dining-philosophers.rs:44:13
[INFO] [stderr]    |
[INFO] [stderr] 44 |         let right = self.right_fork.lock().unwrap();
[INFO] [stderr]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stderr] 
[INFO] [stderr] warning: `comprehensive-rust` (bin "simple-gui" test) generated 1 warning
[INFO] [stderr] warning: `comprehensive-rust` (bin "dining-philosophers" test) generated 2 warnings
[INFO] [stderr] warning: unused variable: `library`
[INFO] [stderr]    --> src/exercises/day-1/book-library.rs:115:9
[INFO] [stderr]     |
[INFO] [stderr] 115 |     let library = Library::new();
[INFO] [stderr]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_library`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `comprehensive-rust` (bin "book-library" test) generated 1 warning
[INFO] [stderr] warning: variant `Out` is never constructed
[INFO] [stderr]   --> src/bare-metal/useful-crates/zerocopy-example/src/main.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | enum RequestType {
[INFO] [stderr]    |      ----------- variant in this enum
[INFO] [stderr] ...
[INFO] [stderr] 23 |     Out = 1,
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `RequestType` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `zerocopy-example` (bin "zerocopy-example" test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/allocator_example-bba00ab9b8720ee1)
[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] [stderr]      Running unittests src/bin/client.rs (/opt/rustwide/target/debug/deps/client-1d8f0137f46829dd)
[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] [stderr]      Running unittests src/bin/server.rs (/opt/rustwide/target/debug/deps/server-e9dbc0965593290e)
[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] [stderr]      Running unittests day-1/book-library.rs (/opt/rustwide/target/debug/deps/book_library-c762a8036e4631f5)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test test_library_print_books ... ok
[INFO] [stdout] test test_library_len ... ok
[INFO] [stdout] test test_library_is_empty ... ok
[INFO] [stdout] test test_library_oldest_book ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stderr]      Running unittests concurrency/dining-philosophers.rs (/opt/rustwide/target/debug/deps/dining_philosophers-231f75250fc613ab)
[INFO] [stdout] 
[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] [stderr]      Running unittests day-1/for-loops.rs (/opt/rustwide/target/debug/deps/for_loops-947fd267c9309c20)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test test_transpose ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests concurrency/link-checker.rs (/opt/rustwide/target/debug/deps/link_checker-0325d536d15dbcec)
[INFO] [stderr]      Running unittests day-2/luhn.rs (/opt/rustwide/target/debug/deps/luhn-68c459dfb3a53380)
[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] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test test_empty_cc_number ... ok
[INFO] [stdout] test test_single_digit_cc_number ... ok
[INFO] [stdout] test test_invalid_cc_number ... ok
[INFO] [stdout] test test_non_digit_cc_number ... ok
[INFO] [stdout] test test_two_digit_cc_number ... ok
[INFO] [stdout] test test_valid_cc_number ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests day-2/points-polygons.rs (/opt/rustwide/target/debug/deps/points_polygons-0b6f35aae250c6c2)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::test_point_magnitude ... ok
[INFO] [stdout] test tests::test_shape_perimeters ... ok
[INFO] [stdout] test tests::test_polygon_left_most_point ... ok
[INFO] [stdout] test tests::test_polygon_iter ... ok
[INFO] [stdout] test tests::test_point_add ... ok
[INFO] [stdout] test tests::test_point_dist ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests day-3/safe-ffi-wrapper.rs (/opt/rustwide/target/debug/deps/safe_ffi_wrapper-6370ff5c7581d8f3)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_nonexisting_directory ... ok
[INFO] [stdout] test tests::test_empty_directory ... ok
[INFO] [stderr]      Running unittests day-3/simple-gui.rs (/opt/rustwide/target/debug/deps/simple_gui-4f5fc7fcf92d1206)
[INFO] [stdout] test tests::test_nonempty_directory ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests day-2/strings-iterators.rs (/opt/rustwide/target/debug/deps/strings_iterators-77f59fdb29875f3f)
[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] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test test_matches_without_wildcard ... ok
[INFO] [stdout] test test_matches_with_wildcard ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mdbook_exerciser-75bad36ec721f021)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/mdbook_exerciser-56e8cc5feb63a483)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/zerocopy_example-30634c147b24eddb)
[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] [stderr]    Doc-tests mdbook_exerciser
[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" "36206fab50f24e9f91ac9bb9f62f42c56eeab82e150c20ea47c25007c8a1d605", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36206fab50f24e9f91ac9bb9f62f42c56eeab82e150c20ea47c25007c8a1d605", kill_on_drop: false }`
[INFO] [stdout] 36206fab50f24e9f91ac9bb9f62f42c56eeab82e150c20ea47c25007c8a1d605