[INFO] cloning repository https://github.com/codingpog/Simple_Blockchain_With_Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/codingpog/Simple_Blockchain_With_Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodingpog%2FSimple_Blockchain_With_Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodingpog%2FSimple_Blockchain_With_Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 77b88bf64acd2199f5a47cef5b5139e76560ed71
[INFO] checking codingpog/Simple_Blockchain_With_Rust against e977a0b5ab976a591981e7263bd67a71a4f79308 for pr-158914
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodingpog%2FSimple_Blockchain_With_Rust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/codingpog/Simple_Blockchain_With_Rust
[INFO] finished tweaking git repo https://github.com/codingpog/Simple_Blockchain_With_Rust
[INFO] tweaked toml for git repo https://github.com/codingpog/Simple_Blockchain_With_Rust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/codingpog/Simple_Blockchain_With_Rust on toolchain e977a0b5ab976a591981e7263bd67a71a4f79308
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/codingpog/Simple_Blockchain_With_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" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking codingpog/Simple_Blockchain_With_Rust against e977a0b5ab976a591981e7263bd67a71a4f79308 for pr-158914
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcodingpog%2FSimple_Blockchain_With_Rust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/codingpog/Simple_Blockchain_With_Rust
[INFO] finished tweaking git repo https://github.com/codingpog/Simple_Blockchain_With_Rust
[INFO] tweaked toml for git repo https://github.com/codingpog/Simple_Blockchain_With_Rust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/codingpog/Simple_Blockchain_With_Rust on toolchain e977a0b5ab976a591981e7263bd67a71a4f79308
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/codingpog/Simple_Blockchain_With_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" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded spmc v0.3.0
[INFO] [stderr]   Downloaded sha2 v0.10.7
[INFO] [stderr]   Downloaded cpufeatures v0.2.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c
[INFO] running `Command { std: "docker" "start" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c" "/opt/rustwide/cargo-home/bin/cargo" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c" "/opt/rustwide/cargo-home/bin/cargo" "+e977a0b5ab976a591981e7263bd67a71a4f79308" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]     Checking cpufeatures v0.2.9
[INFO] [stderr]     Checking spmc v0.3.0
[INFO] [stderr]     Checking typenum v1.16.0
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking crypto-common v0.1.6
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.7
[INFO] [stderr]     Checking a3 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> src/queue.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> src/queue.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `send_output_shared`
[INFO] [stdout]   --> src/queue.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let send_output_shared = Arc::new(Box::new(send_output.clone()));           
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_send_output_shared`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/queue.rs:65:21
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 Err(e) => {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/block.rs:135:13
[INFO] [stdout]     |
[INFO] [stdout] 135 |             q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 135 |             let _ = q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/block.rs:147:13
[INFO] [stdout]     |
[INFO] [stdout] 147 |             q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |             let _ = q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]    |                 ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<'_, TaskType::Output> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `send_output_shared`
[INFO] [stdout]   --> src/queue.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let send_output_shared = Arc::new(Box::new(send_output.clone()));           
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_send_output_shared`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/queue.rs:65:21
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 Err(e) => {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VALID_HASH_STRING` is never used
[INFO] [stdout]   --> src/block_tests.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 | ...   const VALID_HASH_STRING: & str = "4a1c722d8021346fa2f440d7f0bbaa585e632f68fd20fed812fc944613b92500:2:7:this is not interesting...
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VALID_HASH` is never used
[INFO] [stdout]   --> src/block_tests.rs:36:15
[INFO] [stdout]    |
[INFO] [stdout] 36 |         const VALID_HASH : &str = "ba2f9bf0f9ec629db726f1a5fe7312eb76270459e3f5bfdc4e213df9e47cd380";
[INFO] [stdout]    |               ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VALID_HASH_STRING` is never used
[INFO] [stdout]   --> src/block_tests.rs:50:15
[INFO] [stdout]    |
[INFO] [stdout] 50 | ...   const VALID_HASH_STRING: & str = "a42b7e319ee2dee845f1eb842c31dac60a94c04432319638ec1b9f989d000000:2:20:this is not interestin...
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `VALID_HASH` is never used
[INFO] [stdout]   --> src/block_tests.rs:51:15
[INFO] [stdout]    |
[INFO] [stdout] 51 |         const VALID_HASH : &str = "6c589f7a3d2df217fdb39cd969006bc8651a0a3251ffb50470cbc9a0e4d00000";
[INFO] [stdout]    |               ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/block.rs:135:13
[INFO] [stdout]     |
[INFO] [stdout] 135 |             q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 135 |             let _ = q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/block.rs:147:13
[INFO] [stdout]     |
[INFO] [stdout] 147 |             q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |             let _ = q.enqueue(MiningTask::new(block_clone, start_chunk, end_chunk));
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]    |                 ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<'_, TaskType::Output> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `a3::block::Block`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use a3::block::Block;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `a3::block::Block`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use a3::block::Block;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> src/queue.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Mutex`
[INFO] [stdout]  --> src/queue.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                      ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `send_output_shared`
[INFO] [stdout]   --> src/queue.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let send_output_shared = Arc::new(Box::new(send_output.clone()));           
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_send_output_shared`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/queue.rs:65:21
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 Err(e) => {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `send_output_shared`
[INFO] [stdout]   --> src/queue.rs:55:17
[INFO] [stdout]    |
[INFO] [stdout] 55 |             let send_output_shared = Arc::new(Box::new(send_output.clone()));           
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_send_output_shared`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/queue.rs:65:21
[INFO] [stdout]    |
[INFO] [stdout] 65 |                 Err(e) => {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Task` is never used
[INFO] [stdout]  --> src/queue.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait Task {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WorkQueue` is never constructed
[INFO] [stdout]   --> src/queue.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct WorkQueue<TaskType: 'static + Task + Send> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/queue.rs:19:12
[INFO] [stdout]     |
[INFO] [stdout]  18 | impl<TaskType: 'static + Task + Send> WorkQueue<TaskType> {
[INFO] [stdout]     | --------------------------------------------------------- associated items in this implementation
[INFO] [stdout]  19 |     pub fn new(n_workers: usize) -> WorkQueue<TaskType> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  51 |     fn run(recv_tasks: spmc::Receiver<TaskType>, send_output: mpsc::Sender<TaskType::Output>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  83 |     pub fn enqueue(&mut self, t: TaskType) -> Result<(), spmc::SendError<TaskType>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  96 |     pub fn recv(&mut self) -> TaskType::Output {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 101 |     pub fn try_recv(&mut self) -> Result<TaskType::Output, mpsc::TryRecvError> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 104 |     pub fn recv_timeout(
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 111 |     pub fn shutdown(&mut self) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Task` is never used
[INFO] [stdout]  --> src/queue.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub trait Task {
[INFO] [stdout]   |           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `WorkQueue` is never constructed
[INFO] [stdout]   --> src/queue.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct WorkQueue<TaskType: 'static + Task + Send> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/queue.rs:19:12
[INFO] [stdout]     |
[INFO] [stdout]  18 | impl<TaskType: 'static + Task + Send> WorkQueue<TaskType> {
[INFO] [stdout]     | --------------------------------------------------------- associated items in this implementation
[INFO] [stdout]  19 |     pub fn new(n_workers: usize) -> WorkQueue<TaskType> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  51 |     fn run(recv_tasks: spmc::Receiver<TaskType>, send_output: mpsc::Sender<TaskType::Output>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout]  83 |     pub fn enqueue(&mut self, t: TaskType) -> Result<(), spmc::SendError<TaskType>> {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  96 |     pub fn recv(&mut self) -> TaskType::Output {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 101 |     pub fn try_recv(&mut self) -> Result<TaskType::Output, mpsc::TryRecvError> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 104 |     pub fn recv_timeout(
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 111 |     pub fn shutdown(&mut self) {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]    |                 ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<'_, TaskType::Output> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/queue.rs:93:17
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<TaskType::Output> {
[INFO] [stdout]    |                 ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 93 |     pub fn iter(&mut self) -> mpsc::Iter<'_, TaskType::Output> {
[INFO] [stdout]    |                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `Command { std: "docker" "inspect" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c", kill_on_drop: false }`
[INFO] [stdout] 596d82285fbb23e2369fac0b9547636e3ab40e2a2894de37a8baac9bf5b9f22c
