[INFO] cloning repository https://github.com/nakayan5/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nakayan5/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnakayan5%2Frust-learning", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d5fd40c3282784911dc0b263421fe7cd107bef69
[INFO] testing nakayan5/rust-learning against beta-2025-10-28 for beta-1.92-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnakayan5%2Frust-learning" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nakayan5/rust-learning
[INFO] finished tweaking git repo https://github.com/nakayan5/rust-learning
[INFO] tweaked toml for git repo https://github.com/nakayan5/rust-learning written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nakayan5/rust-learning on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nakayan5/rust-learning 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-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "636ebc8ddc01c69c006fb5c7ea6502e227ff52096130c9b45122e1c7e63f9895", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "636ebc8ddc01c69c006fb5c7ea6502e227ff52096130c9b45122e1c7e63f9895", kill_on_drop: false }`
[INFO] [stdout] 636ebc8ddc01c69c006fb5c7ea6502e227ff52096130c9b45122e1c7e63f9895
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd5a41ee6bae129a8d6180aa517c0fffff4d35bcb4490dfc1465e17d489f570e
[INFO] running `Command { std: "docker" "start" "-a" "fd5a41ee6bae129a8d6180aa517c0fffff4d35bcb4490dfc1465e17d489f570e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.52
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling once_cell v1.17.1
[INFO] [stderr]    Compiling pin-project-lite v0.2.9
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling serde v1.0.155
[INFO] [stderr]    Compiling parking_lot_core v0.9.7
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[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling futures-core v0.3.27
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling tokio v1.26.0
[INFO] [stderr]    Compiling unicode-segmentation v1.10.1
[INFO] [stderr]    Compiling unicode-width v0.1.10
[INFO] [stderr]    Compiling serde_json v1.0.94
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling tracing-core v0.1.30
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling iana-time-zone v0.1.53
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[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling sharded-slab v0.1.4
[INFO] [stderr]    Compiling proconio v0.4.3
[INFO] [stderr]    Compiling tracing-log v0.1.3
[INFO] [stderr]    Compiling quote v1.0.26
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[INFO] [stderr]    Compiling mio v0.8.6
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[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling socket2 v0.4.9
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling atoi v0.3.3
[INFO] [stderr]    Compiling chrono v0.4.24
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling regex v1.7.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling matchers v0.0.1
[INFO] [stderr]    Compiling tracing-serde v0.1.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.23
[INFO] [stderr]    Compiling pin-project-internal v1.0.12
[INFO] [stderr]    Compiling tokio-macros v1.8.2
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling async-stream-impl v0.3.4
[INFO] [stderr]    Compiling async-stream v0.3.4
[INFO] [stderr]    Compiling pin-project v1.0.12
[INFO] [stderr]    Compiling tracing v0.1.37
[INFO] [stderr]    Compiling structopt v0.3.26
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling tracing-subscriber v0.2.25
[INFO] [stderr]    Compiling tokio-stream v0.1.12
[INFO] [stderr]    Compiling mini-redis v0.4.1
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/section/async_await_example.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn main() -> Result<()> {
[INFO] [stdout]   |              ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `async_fn` is never used
[INFO] [stdout]   --> src/section/async_await_example.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | async fn async_fn() -> std::io::Result<()> {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red` and `Green` are never constructed
[INFO] [stdout]  --> src/section/enum_example.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Color {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_fn` is never used
[INFO] [stdout]  --> src/section/ownership_example.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub(crate) fn ownership_fn() {
[INFO] [stdout]   |               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Greet` is never constructed
[INFO] [stdout]   --> src/section/ownership_example.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct Greet<'a> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `say` is never used
[INFO] [stdout]   --> src/section/ownership_example.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl<'a> Greet<'a> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 36 |     fn say(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_fn` is never used
[INFO] [stdout]   --> src/section/ownership_example.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn greet_fn() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Greeter` is never used
[INFO] [stdout]  --> src/section/trait_example.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait Greeter {
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]  --> src/section/trait_example.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Person(String);
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hours` is never constructed
[INFO] [stdout]   --> src/section/trait_example.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Hours(u32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/section/trait_example.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.13s
[INFO] running `Command { std: "docker" "inspect" "fd5a41ee6bae129a8d6180aa517c0fffff4d35bcb4490dfc1465e17d489f570e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd5a41ee6bae129a8d6180aa517c0fffff4d35bcb4490dfc1465e17d489f570e", kill_on_drop: false }`
[INFO] [stdout] fd5a41ee6bae129a8d6180aa517c0fffff4d35bcb4490dfc1465e17d489f570e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b413330ccd18f56e9366fcc8f0b6413990bdcc15139bf0d864ab55717030b566
[INFO] running `Command { std: "docker" "start" "-a" "b413330ccd18f56e9366fcc8f0b6413990bdcc15139bf0d864ab55717030b566", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/section/async_await_example.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub async fn main() -> Result<()> {
[INFO] [stdout]   |              ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `async_fn` is never used
[INFO] [stdout]   --> src/section/async_await_example.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 | async fn async_fn() -> std::io::Result<()> {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Red` and `Green` are never constructed
[INFO] [stdout]  --> src/section/enum_example.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | enum Color {
[INFO] [stdout]   |      ----- variants in this enum
[INFO] [stdout] 3 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout] 4 |     Green,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ownership_fn` is never used
[INFO] [stdout]  --> src/section/ownership_example.rs:3:15
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub(crate) fn ownership_fn() {
[INFO] [stdout]   |               ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Greet` is never constructed
[INFO] [stdout]   --> src/section/ownership_example.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | struct Greet<'a> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `say` is never used
[INFO] [stdout]   --> src/section/ownership_example.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl<'a> Greet<'a> {
[INFO] [stdout]    | ------------------ method in this implementation
[INFO] [stdout] 36 |     fn say(&self) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_fn` is never used
[INFO] [stdout]   --> src/section/ownership_example.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn greet_fn() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Greeter` is never used
[INFO] [stdout]  --> src/section/trait_example.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 | trait Greeter {
[INFO] [stdout]   |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Person` is never constructed
[INFO] [stdout]  --> src/section/trait_example.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct Person(String);
[INFO] [stdout]   |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Hours` is never constructed
[INFO] [stdout]   --> src/section/trait_example.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | struct Hours(u32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/section/trait_example.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "b413330ccd18f56e9366fcc8f0b6413990bdcc15139bf0d864ab55717030b566", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b413330ccd18f56e9366fcc8f0b6413990bdcc15139bf0d864ab55717030b566", kill_on_drop: false }`
[INFO] [stdout] b413330ccd18f56e9366fcc8f0b6413990bdcc15139bf0d864ab55717030b566
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8faf30dfc7e9a337789fcbc21647110df03624aa9a4082ff656161b51ca627fe
[INFO] running `Command { std: "docker" "start" "-a" "8faf30dfc7e9a337789fcbc21647110df03624aa9a4082ff656161b51ca627fe", kill_on_drop: false }`
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/section/async_await_example.rs:4:14
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub async fn main() -> Result<()> {
[INFO] [stderr]   |              ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `async_fn` is never used
[INFO] [stderr]   --> src/section/async_await_example.rs:21:10
[INFO] [stderr]    |
[INFO] [stderr] 21 | async fn async_fn() -> std::io::Result<()> {
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Red` and `Green` are never constructed
[INFO] [stderr]  --> src/section/enum_example.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | enum Color {
[INFO] [stderr]   |      ----- variants in this enum
[INFO] [stderr] 3 |     Red,
[INFO] [stderr]   |     ^^^
[INFO] [stderr] 4 |     Green,
[INFO] [stderr]   |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `ownership_fn` is never used
[INFO] [stderr]  --> src/section/ownership_example.rs:3:15
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub(crate) fn ownership_fn() {
[INFO] [stderr]   |               ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Greet` is never constructed
[INFO] [stderr]   --> src/section/ownership_example.rs:31:8
[INFO] [stderr]    |
[INFO] [stderr] 31 | struct Greet<'a> {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `say` is never used
[INFO] [stderr]   --> src/section/ownership_example.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 35 | impl<'a> Greet<'a> {
[INFO] [stderr]    | ------------------ method in this implementation
[INFO] [stderr] 36 |     fn say(&self) {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `greet_fn` is never used
[INFO] [stderr]   --> src/section/ownership_example.rs:41:4
[INFO] [stderr]    |
[INFO] [stderr] 41 | fn greet_fn() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Greeter` is never used
[INFO] [stderr]  --> src/section/trait_example.rs:4:7
[INFO] [stderr]   |
[INFO] [stderr] 4 | trait Greeter {
[INFO] [stderr]   |       ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Person` is never constructed
[INFO] [stderr]  --> src/section/trait_example.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Person(String);
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Hours` is never constructed
[INFO] [stderr]   --> src/section/trait_example.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | struct Hours(u32);
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/section/trait_example.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn main() {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-learning` (bin "rust-learning" test) generated 11 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_learning-43a4fb900b330f8a)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test section::test_example::tests::div_test ... ok
[INFO] [stdout] test section::test_example::div_test ... ok
[INFO] [stdout] test section::test_example::div_panic_test - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8faf30dfc7e9a337789fcbc21647110df03624aa9a4082ff656161b51ca627fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8faf30dfc7e9a337789fcbc21647110df03624aa9a4082ff656161b51ca627fe", kill_on_drop: false }`
[INFO] [stdout] 8faf30dfc7e9a337789fcbc21647110df03624aa9a4082ff656161b51ca627fe