[INFO] fetching crate bookshelf 1.1.4...
[INFO] testing bookshelf-1.1.4 against beta-2023-04-20 for beta-1.70-1
[INFO] extracting crate bookshelf 1.1.4 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate bookshelf 1.1.4 on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bookshelf 1.1.4
[INFO] finished tweaking crates.io crate bookshelf 1.1.4
[INFO] tweaked toml for crates.io crate bookshelf 1.1.4 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate bookshelf 1.1.4 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-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded shellexpand v2.1.0
[INFO] [stderr]   Downloaded getrandom v0.2.2
[INFO] [stderr]   Downloaded cassowary v0.3.0
[INFO] [stderr]   Downloaded libc v0.2.88
[INFO] [stderr]   Downloaded aho-corasick v0.7.15
[INFO] [stderr]   Downloaded termion v1.5.6
[INFO] [stderr]   Downloaded indexmap v1.6.2
[INFO] [stderr]   Downloaded serde_derive v1.0.124
[INFO] [stderr]   Downloaded bincode v1.3.2
[INFO] [stderr]   Downloaded regex-syntax v0.6.23
[INFO] [stderr]   Downloaded regex v1.4.5
[INFO] [stderr]   Downloaded serde v1.0.124
[INFO] [stderr]   Downloaded redox_syscall v0.2.5
[INFO] [stderr]   Downloaded tui v0.14.0
[INFO] [stderr]   Downloaded memchr v2.3.4
[INFO] [stderr]   Downloaded serde_yaml v0.8.17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ae1934e11263d615251300c8af0a38aee1400beae0b8817991db3b451db28465
[INFO] running `Command { std: "docker" "start" "-a" "ae1934e11263d615251300c8af0a38aee1400beae0b8817991db3b451db28465", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ae1934e11263d615251300c8af0a38aee1400beae0b8817991db3b451db28465", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae1934e11263d615251300c8af0a38aee1400beae0b8817991db3b451db28465", kill_on_drop: false }`
[INFO] [stdout] ae1934e11263d615251300c8af0a38aee1400beae0b8817991db3b451db28465
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0e3c9ea49e9c8a7005d3797fbb97a7a86d1c8c4431fbabc694d4ab7fe5e961ab
[INFO] running `Command { std: "docker" "start" "-a" "0e3c9ea49e9c8a7005d3797fbb97a7a86d1c8c4431fbabc694d4ab7fe5e961ab", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.64
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling serde_derive v1.0.124
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling serde v1.0.124
[INFO] [stderr]    Compiling linked-hash-map v0.5.4
[INFO] [stderr]    Compiling numtoa v0.1.0
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling cassowary v0.3.0
[INFO] [stderr]    Compiling regex-syntax v0.6.23
[INFO] [stderr]    Compiling dtoa v0.4.7
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling dirs-sys-next v0.1.2
[INFO] [stderr]    Compiling termion v1.5.6
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling dirs-next v2.0.0
[INFO] [stderr]    Compiling shellexpand v2.1.0
[INFO] [stderr]    Compiling tui v0.14.0
[INFO] [stderr]    Compiling regex v1.4.5
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling clap_derive v3.0.0-beta.2
[INFO] [stderr]    Compiling clap v3.0.0-beta.2
[INFO] [stderr]    Compiling bincode v1.3.2
[INFO] [stderr]    Compiling serde_yaml v0.8.17
[INFO] [stderr]    Compiling bookshelf v1.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `module`
[INFO] [stdout]    --> src/tui/ui.rs:236:25
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_module`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `code`
[INFO] [stdout]    --> src/tui/ui.rs:236:42
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |                                          ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `input_handle` and `tick_handle` are never read
[INFO] [stdout]   --> src/tui/event.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Events {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |     rx: mpsc::Receiver<Event<Key>>,
[INFO] [stdout] 22 |     input_handle: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 23 |     ignore_exit_key: Arc<AtomicBool>,
[INFO] [stdout] 24 |     tick_handle: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `module_handler` is never read
[INFO] [stdout]   --> src/tui/ui.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub struct TUI<'lt> {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 75 |     module_handler: &'lt ModuleHandler,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `open_item` is never used
[INFO] [stdout]    --> src/tui/ui.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | impl<'lt> TUI<'lt> {
[INFO] [stdout]     | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:111:21
[INFO] [stdout]     |
[INFO] [stdout] 111 | /                     match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stdout] 112 | |                         Ok(()) => Ok(()),
[INFO] [stdout] 113 | |                         Err(e) => Err(e),
[INFO] [stdout] 114 | |                     };
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 111 |                     let _ = match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.76s
[INFO] running `Command { std: "docker" "inspect" "0e3c9ea49e9c8a7005d3797fbb97a7a86d1c8c4431fbabc694d4ab7fe5e961ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e3c9ea49e9c8a7005d3797fbb97a7a86d1c8c4431fbabc694d4ab7fe5e961ab", kill_on_drop: false }`
[INFO] [stdout] 0e3c9ea49e9c8a7005d3797fbb97a7a86d1c8c4431fbabc694d4ab7fe5e961ab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a546e772a3aea8940a65019049bb06446acbe66aec68c039ede1a8f6e6073142
[INFO] running `Command { std: "docker" "start" "-a" "a546e772a3aea8940a65019049bb06446acbe66aec68c039ede1a8f6e6073142", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling bookshelf v1.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `module`
[INFO] [stdout]    --> src/tui/ui.rs:236:25
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_module`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `code`
[INFO] [stdout]    --> src/tui/ui.rs:236:42
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |                                          ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `input_handle` and `tick_handle` are never read
[INFO] [stdout]   --> src/tui/event.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub struct Events {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 21 |     rx: mpsc::Receiver<Event<Key>>,
[INFO] [stdout] 22 |     input_handle: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 23 |     ignore_exit_key: Arc<AtomicBool>,
[INFO] [stdout] 24 |     tick_handle: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `module_handler` is never read
[INFO] [stdout]   --> src/tui/ui.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 72 | pub struct TUI<'lt> {
[INFO] [stdout]    |            --- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 75 |     module_handler: &'lt ModuleHandler,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `open_item` is never used
[INFO] [stdout]    --> src/tui/ui.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 108 | impl<'lt> TUI<'lt> {
[INFO] [stdout]     | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/main.rs:111:21
[INFO] [stdout]     |
[INFO] [stdout] 111 | /                     match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stdout] 112 | |                         Ok(()) => Ok(()),
[INFO] [stdout] 113 | |                         Err(e) => Err(e),
[INFO] [stdout] 114 | |                     };
[INFO] [stdout]     | |_____________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 111 |                     let _ = match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `Command { std: "docker" "inspect" "a546e772a3aea8940a65019049bb06446acbe66aec68c039ede1a8f6e6073142", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a546e772a3aea8940a65019049bb06446acbe66aec68c039ede1a8f6e6073142", kill_on_drop: false }`
[INFO] [stdout] a546e772a3aea8940a65019049bb06446acbe66aec68c039ede1a8f6e6073142
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ae373a12f6485545846771644411033638b47a34a5c20786cc7e99f45f73624b
[INFO] running `Command { std: "docker" "start" "-a" "ae373a12f6485545846771644411033638b47a34a5c20786cc7e99f45f73624b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `module`
[INFO] [stderr]    --> src/tui/ui.rs:236:25
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stderr]     |                         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_module`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `code`
[INFO] [stderr]    --> src/tui/ui.rs:236:42
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stderr]     |                                          ^^^^ help: if this is intentional, prefix it with an underscore: `_code`
[INFO] [stderr] 
[INFO] [stderr] warning: fields `input_handle` and `tick_handle` are never read
[INFO] [stderr]   --> src/tui/event.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub struct Events {
[INFO] [stderr]    |            ------ fields in this struct
[INFO] [stderr] 21 |     rx: mpsc::Receiver<Event<Key>>,
[INFO] [stderr] 22 |     input_handle: thread::JoinHandle<()>,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 23 |     ignore_exit_key: Arc<AtomicBool>,
[INFO] [stderr] 24 |     tick_handle: thread::JoinHandle<()>,
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `module_handler` is never read
[INFO] [stderr]   --> src/tui/ui.rs:75:5
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub struct TUI<'lt> {
[INFO] [stderr]    |            --- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 75 |     module_handler: &'lt ModuleHandler,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `open_item` is never used
[INFO] [stderr]    --> src/tui/ui.rs:236:8
[INFO] [stderr]     |
[INFO] [stderr] 108 | impl<'lt> TUI<'lt> {
[INFO] [stderr]     | ------------------ method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 236 |     fn open_item(&self, module: &String, code: &String) {}
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]    --> src/main.rs:111:21
[INFO] [stderr]     |
[INFO] [stderr] 111 | /                     match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stderr] 112 | |                         Ok(()) => Ok(()),
[INFO] [stderr] 113 | |                         Err(e) => Err(e),
[INFO] [stderr] 114 | |                     };
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 111 |                     let _ = match module_handler.download(&module, &code, &dest_dir) {
[INFO] [stderr]     |                     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `bookshelf` (bin "bookshelf" test) generated 6 warnings (run `cargo fix --bin "bookshelf" --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/bookshelf-883e1455ac57fa80)
[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" "ae373a12f6485545846771644411033638b47a34a5c20786cc7e99f45f73624b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae373a12f6485545846771644411033638b47a34a5c20786cc7e99f45f73624b", kill_on_drop: false }`
[INFO] [stdout] ae373a12f6485545846771644411033638b47a34a5c20786cc7e99f45f73624b
