[INFO] fetching crate medina 0.0.2-alpha.11...
[INFO] testing medina-0.0.2-alpha.11 against 1.60.0 for beta-1.61-1
[INFO] extracting crate medina 0.0.2-alpha.11 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate medina 0.0.2-alpha.11 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate medina 0.0.2-alpha.11
[INFO] finished tweaking crates.io crate medina 0.0.2-alpha.11
[INFO] tweaked toml for crates.io crate medina 0.0.2-alpha.11 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate medina 0.0.2-alpha.11 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded blocking v0.4.7
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.17
[INFO] [stderr]   Downloaded async-trait v0.1.36
[INFO] [stderr]   Downloaded parking v1.0.6
[INFO] [stderr]   Downloaded futures-lite v0.1.10
[INFO] [stderr]   Downloaded async-mutex v1.1.5
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.67
[INFO] [stderr]   Downloaded fastrand v1.3.4
[INFO] [stderr]   Downloaded async-channel v1.4.1
[INFO] [stderr]   Downloaded event-listener v2.4.0
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.67
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.67
[INFO] [stderr]   Downloaded plum v0.1.5
[INFO] [stderr]   Downloaded web-sys v0.3.44
[INFO] [stderr]   Downloaded tinyvec v0.3.3
[INFO] [stderr]   Downloaded js-sys v0.3.44
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.67
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.67
[INFO] [stderr]   Downloaded pin-project v0.4.23
[INFO] [stderr]   Downloaded pin-project-internal v0.4.23
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc932c4ada5b2a26db3a7df4a950aba735353b9dc39e146d42e81ec27617b4ca
[INFO] running `Command { std: "docker" "start" "-a" "dc932c4ada5b2a26db3a7df4a950aba735353b9dc39e146d42e81ec27617b4ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc932c4ada5b2a26db3a7df4a950aba735353b9dc39e146d42e81ec27617b4ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc932c4ada5b2a26db3a7df4a950aba735353b9dc39e146d42e81ec27617b4ca", kill_on_drop: false }`
[INFO] [stdout] dc932c4ada5b2a26db3a7df4a950aba735353b9dc39e146d42e81ec27617b4ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1df21c76027910649de9485ca1a4f832fd56273dad7fd6697a67f0b8bfc93b47
[INFO] running `Command { std: "docker" "start" "-a" "1df21c76027910649de9485ca1a4f832fd56273dad7fd6697a67f0b8bfc93b47", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling event-listener v2.4.0
[INFO] [stderr]    Compiling bit-vec v0.6.2
[INFO] [stderr]    Compiling futures-timer v3.0.2
[INFO] [stderr]    Compiling async-mutex v1.1.5
[INFO] [stderr]    Compiling async-channel v1.4.1
[INFO] [stderr]    Compiling plum v0.1.5
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling async-trait v0.1.36
[INFO] [stderr]    Compiling pin-project v0.4.23
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling medina v0.0.2-alpha.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `async_mutex::Mutex`
[INFO] [stdout]  --> src/crawler.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use async_mutex::Mutex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `event_listener::Event`
[INFO] [stdout]  --> src/crawler.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use event_listener::Event;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future::FutureExt`
[INFO] [stdout]  --> src/crawler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::future::FutureExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::select`
[INFO] [stdout]  --> src/crawler.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use futures::select;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/crawler.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::task_runner::TaskRunner`
[INFO] [stdout]   --> src/crawler.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use super::task_runner::TaskRunner;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_item`
[INFO] [stdout]    --> src/crawler.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 |     fn pop_item(&mut self) -> Option<Box<dyn Page>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `process_request_with_retry`
[INFO] [stdout]    --> src/crawler.rs:183:14
[INFO] [stdout]     |
[INFO] [stdout] 183 |     async fn process_request_with_retry(
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `crawl`
[INFO] [stdout]    --> src/crawler.rs:268:14
[INFO] [stdout]     |
[INFO] [stdout] 268 |     async fn crawl(
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TaskRunner`
[INFO] [stdout]  --> src/task_runner.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct TaskRunner {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/task_runner.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/task_runner.rs:20:18
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub async fn run(tasks_mutex: &(Mutex<TaskRunner>, Event)) {
[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 30.45s
[INFO] running `Command { std: "docker" "inspect" "1df21c76027910649de9485ca1a4f832fd56273dad7fd6697a67f0b8bfc93b47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1df21c76027910649de9485ca1a4f832fd56273dad7fd6697a67f0b8bfc93b47", kill_on_drop: false }`
[INFO] [stdout] 1df21c76027910649de9485ca1a4f832fd56273dad7fd6697a67f0b8bfc93b47
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9eed54bdd1e04c5ececf1f9c7ba2dc9e845e6958e87b588816ea1a381926ed1b
[INFO] running `Command { std: "docker" "start" "-a" "9eed54bdd1e04c5ececf1f9c7ba2dc9e845e6958e87b588816ea1a381926ed1b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling medina v0.0.2-alpha.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `async_mutex::Mutex`
[INFO] [stdout]  --> src/crawler.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use async_mutex::Mutex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `event_listener::Event`
[INFO] [stdout]  --> src/crawler.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use event_listener::Event;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future::FutureExt`
[INFO] [stdout]  --> src/crawler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::future::FutureExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::select`
[INFO] [stdout]  --> src/crawler.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use futures::select;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/crawler.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::task_runner::TaskRunner`
[INFO] [stdout]   --> src/crawler.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use super::task_runner::TaskRunner;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_item`
[INFO] [stdout]    --> src/crawler.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 |     fn pop_item(&mut self) -> Option<Box<dyn Page>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `process_request_with_retry`
[INFO] [stdout]    --> src/crawler.rs:183:14
[INFO] [stdout]     |
[INFO] [stdout] 183 |     async fn process_request_with_retry(
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `crawl`
[INFO] [stdout]    --> src/crawler.rs:268:14
[INFO] [stdout]     |
[INFO] [stdout] 268 |     async fn crawl(
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TaskRunner`
[INFO] [stdout]  --> src/task_runner.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct TaskRunner {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/task_runner.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/task_runner.rs:20:18
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub async fn run(tasks_mutex: &(Mutex<TaskRunner>, Event)) {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `tokio`
[INFO] [stdout]   --> examples/fake_page_tokio.rs:64:3
[INFO] [stdout]    |
[INFO] [stdout] 64 | #[tokio::main]
[INFO] [stdout]    |   ^^^^^ use of undeclared crate or module `tokio`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `run` found for struct `Crawler` in the current scope
[INFO] [stdout]   --> examples/fake_page_tokio.rs:71:10
[INFO] [stdout]    |
[INFO] [stdout] 71 |         .run(50, 30)
[INFO] [stdout]    |          ^^^ method not found in `Crawler`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0752]: `main` function is not allowed to be `async`
[INFO] [stdout]   --> examples/fake_page_tokio.rs:65:1
[INFO] [stdout]    |
[INFO] [stdout] 65 | async fn main() {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0599, E0752.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `medina` due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0432]: unresolved import `async_std`
[INFO] [stdout]  --> examples/fake_page_async_std.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use async_std::task;
[INFO] [stdout]   |     ^^^^^^^^^ use of undeclared crate or module `async_std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_mutex::Mutex`
[INFO] [stdout]  --> src/crawler.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use async_mutex::Mutex;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `event_listener::Event`
[INFO] [stdout]  --> src/crawler.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use event_listener::Event;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future::FutureExt`
[INFO] [stdout]  --> src/crawler.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use futures::future::FutureExt;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::select`
[INFO] [stdout]  --> src/crawler.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use futures::select;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::Arc`
[INFO] [stdout]  --> src/crawler.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::sync::Arc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::task_runner::TaskRunner`
[INFO] [stdout]   --> src/crawler.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | use super::task_runner::TaskRunner;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `run` found for struct `Crawler` in the current scope
[INFO] [stdout]   --> examples/fake_page_async_std.rs:55:14
[INFO] [stdout]    |
[INFO] [stdout] 55 |             .run(50, 30)
[INFO] [stdout]    |              ^^^ method not found in `Crawler`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `pop_item`
[INFO] [stdout]    --> src/crawler.rs:126:8
[INFO] [stdout]     |
[INFO] [stdout] 126 |     fn pop_item(&mut self) -> Option<Box<dyn Page>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `process_request_with_retry`
[INFO] [stdout]    --> src/crawler.rs:183:14
[INFO] [stdout]     |
[INFO] [stdout] 183 |     async fn process_request_with_retry(
[INFO] [stdout]     |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `crawl`
[INFO] [stdout]    --> src/crawler.rs:268:14
[INFO] [stdout]     |
[INFO] [stdout] 268 |     async fn crawl(
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TaskRunner`
[INFO] [stdout]  --> src/task_runner.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub struct TaskRunner {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/task_runner.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     pub fn new() -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `run`
[INFO] [stdout]   --> src/task_runner.rs:20:18
[INFO] [stdout]    |
[INFO] [stdout] 20 |     pub async fn run(tasks_mutex: &(Mutex<TaskRunner>, Event)) {
[INFO] [stdout]    |                  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9eed54bdd1e04c5ececf1f9c7ba2dc9e845e6958e87b588816ea1a381926ed1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9eed54bdd1e04c5ececf1f9c7ba2dc9e845e6958e87b588816ea1a381926ed1b", kill_on_drop: false }`
[INFO] [stdout] 9eed54bdd1e04c5ececf1f9c7ba2dc9e845e6958e87b588816ea1a381926ed1b