[INFO] cloning repository https://github.com/modulitos/async_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/modulitos/async_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fasync_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fasync_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9f98e52ed4f718fe4814f7a36bcb8741da5328e
[INFO] checking modulitos/async_book against 0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0 for pr-158915-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodulitos%2Fasync_book" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/modulitos/async_book
[INFO] finished tweaking git repo https://github.com/modulitos/async_book
[INFO] tweaked toml for git repo https://github.com/modulitos/async_book written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/modulitos/async_book on toolchain 0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/modulitos/async_book 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" "+0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: binary `ch_2_build_executor` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-5-tc2/source/target/.../ch_2_build_executor
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `ch-2-build-executor`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_2_build_executor.rs
[INFO] [stderr] 1 + src/bin/ch-2-build-executor.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_3_async_blocks` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-5-tc2/source/target/.../ch_3_async_blocks
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-3-async-blocks`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_3_async_blocks.rs
[INFO] [stderr] 1 + src/bin/ch-3-async-blocks.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_4_pinning` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-5-tc2/source/target/.../ch_4_pinning
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-4-pinning`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_4_pinning.rs
[INFO] [stderr] 1 + src/bin/ch-4-pinning.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_6_select` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-5-tc2/source/target/.../ch_6_select
[INFO] [stderr]   |                                                  ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-6-select`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_6_select.rs
[INFO] [stderr] 1 + src/bin/ch-6-select.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `race_futures` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-5-tc2/source/target/.../race_futures
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `race-futures`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/race_futures.rs
[INFO] [stderr] 1 + src/bin/race-futures.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `async_book` (manifest) generated 5 warnings
[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 proc-macro2 v1.0.19
[INFO] [stderr]   Downloaded pin-project v0.4.23
[INFO] [stderr]   Downloaded hermit-abi v0.1.15
[INFO] [stderr]   Downloaded pin-project-internal v0.4.23
[INFO] [stderr]   Downloaded syn v1.0.39
[INFO] [stderr]   Downloaded libc v0.2.76
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da
[INFO] running `Command { std: "docker" "start" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da", 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" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da" "/opt/rustwide/cargo-home/bin/cargo" "+0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da", 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" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da" "/opt/rustwide/cargo-home/bin/cargo" "+0335fc7ee9e33d92e03d99f3e2fb0fe6119f3cc0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: binary `ch_2_build_executor` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../ch_2_build_executor
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `ch-2-build-executor`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_2_build_executor.rs
[INFO] [stderr] 1 + src/bin/ch-2-build-executor.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_3_async_blocks` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../ch_3_async_blocks
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-3-async-blocks`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_3_async_blocks.rs
[INFO] [stderr] 1 + src/bin/ch-3-async-blocks.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_4_pinning` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../ch_4_pinning
[INFO] [stderr]   |                          ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-4-pinning`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_4_pinning.rs
[INFO] [stderr] 1 + src/bin/ch-4-pinning.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `ch_6_select` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../ch_6_select
[INFO] [stderr]   |                          ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `ch-6-select`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/ch_6_select.rs
[INFO] [stderr] 1 + src/bin/ch-6-select.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `race_futures` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../race_futures
[INFO] [stderr]   |                          ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `race-futures`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/race_futures.rs
[INFO] [stderr] 1 + src/bin/race-futures.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `async_book` (manifest) generated 5 warnings
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking async_book v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]   --> src/executor.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | / pub struct Executor {
[INFO] [stdout] 18 | |     ready_queue: Receiver<Arc<Task>>,
[INFO] [stdout] 19 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout]  3 |     missing_debug_implementations,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]   --> src/executor.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 | / pub struct Spawner {
[INFO] [stdout] 23 | |     task_sender: SyncSender<Arc<Task>>,
[INFO] [stdout] 24 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]   --> src/executor.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | / pub struct Executor {
[INFO] [stdout] 18 | |     ready_queue: Receiver<Arc<Task>>,
[INFO] [stdout] 19 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout]  3 |     missing_debug_implementations,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type does not implement `Debug`; consider adding `#[derive(Debug)]` or a manual implementation
[INFO] [stdout]   --> src/executor.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 | / pub struct Spawner {
[INFO] [stdout] 23 | |     task_sender: SyncSender<Arc<Task>>,
[INFO] [stdout] 24 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TestNoPin` is never constructed
[INFO] [stdout]  --> src/bin/ch_4_pinning.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct TestNoPin {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/bin/ch_4_pinning.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl TestNoPin {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 11 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 18 |     fn init(&mut self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     fn a(&self) -> &str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 27 |     fn b(&self) -> &String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TestStackPin` is never constructed
[INFO] [stdout]   --> src/bin/ch_4_pinning.rs:56:8
[INFO] [stdout]    |
[INFO] [stdout] 56 | struct TestStackPin {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `init`, `a`, and `b` are never used
[INFO] [stdout]   --> src/bin/ch_4_pinning.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl TestStackPin {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout] 63 |     fn new(txt: &str) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     fn init(self: Pin<&mut Self>) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 76 |     fn a(self: Pin<&'_ Self>) -> &'_ str {
[INFO] [stdout]    |        ^
[INFO] [stdout] ...
[INFO] [stdout] 80 |     fn b(self: Pin<&'_ Self>) -> &'_ String {
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TestHeapPin` is never constructed
[INFO] [stdout]    --> src/bin/ch_4_pinning.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 | struct TestHeapPin {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `a`, and `b` are never used
[INFO] [stdout]    --> src/bin/ch_4_pinning.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 124 | impl TestHeapPin {
[INFO] [stdout]     | ---------------- associated items in this implementation
[INFO] [stdout] 125 |     fn new(txt: &str) -> Pin<Box<Self>> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 143 |     fn a(&self) -> &str {
[INFO] [stdout]     |        ^
[INFO] [stdout] ...
[INFO] [stdout] 147 |     fn b(&self) -> &String {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `future` is never read
[INFO] [stdout]   --> src/bin/ch_3_async_blocks.rs:60:26
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut future = None;
[INFO] [stdout]    |                          ^^^^ this value is reassigned later and never used
[INFO] [stdout] 61 |         future = Some(foo(&x));
[INFO] [stdout]    |         ------ `future` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo_expanded` is never used
[INFO] [stdout]   --> src/bin/ch_3_async_blocks.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn foo_expanded<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `c` is never read
[INFO] [stdout]    --> src/bin/ch_4_pinning.rs:121:5
[INFO] [stdout]     |
[INFO] [stdout] 118 | struct TestHeapPin {
[INFO] [stdout]     |        ----------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 121 |     c: PhantomPinned
[INFO] [stdout]     |     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `TestHeapPin` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `a` is never used
[INFO] [stdout]    --> src/bin/ch_4_pinning.rs:143:8
[INFO] [stdout]     |
[INFO] [stdout] 124 | impl TestHeapPin {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 143 |     fn a(&self) -> &str {
[INFO] [stdout]     |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `future` is never read
[INFO] [stdout]   --> src/bin/ch_3_async_blocks.rs:60:26
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut future = None;
[INFO] [stdout]    |                          ^^^^ this value is reassigned later and never used
[INFO] [stdout] 61 |         future = Some(foo(&x));
[INFO] [stdout]    |         ------ `future` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `foo_expanded` is never used
[INFO] [stdout]   --> src/bin/ch_3_async_blocks.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn foo_expanded<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ThreadPool`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 |     executor::{block_on, ThreadPool, ThreadPoolBuilder},
[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: `tokio::task`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tokio::task;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::time::delay_for`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use tokio::time::delay_for;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_book::delay_future::Delay`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use async_book::delay_future::Delay;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `LocalSpawnExt`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 | use futures::task::{LocalSpawnExt, SpawnExt};
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::Thread`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::thread::Thread;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ThreadPool`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 |     executor::{block_on, ThreadPool, ThreadPoolBuilder},
[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: `tokio::task`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tokio::task;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::time::delay_for`
[INFO] [stdout]  --> src/bin/ch_6_select.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use tokio::time::delay_for;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `async_book::delay_future::Delay`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use async_book::delay_future::Delay;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `LocalSpawnExt`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:14:21
[INFO] [stdout]    |
[INFO] [stdout] 14 | use futures::task::{LocalSpawnExt, SpawnExt};
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread::Thread`
[INFO] [stdout]   --> src/bin/ch_6_select.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::thread::Thread;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch_6_select.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |     let mut pool = ThreadPoolBuilder::new().pool_size(4).create().unwrap();
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count` is never used
[INFO] [stdout]   --> src/bin/ch_6_select.rs:70:10
[INFO] [stdout]    |
[INFO] [stdout] 70 | async fn count() {
[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 `add_two_streams` is never used
[INFO] [stdout]   --> src/bin/ch_6_select.rs:94:10
[INFO] [stdout]    |
[INFO] [stdout] 94 | async fn add_two_streams(
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_pool_executor` is never used
[INFO] [stdout]    --> src/bin/ch_6_select.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn thread_pool_executor() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tokio_runtime` is never used
[INFO] [stdout]    --> src/bin/ch_6_select.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn tokio_runtime() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/bin/ch_6_select.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |     let mut pool = ThreadPoolBuilder::new().pool_size(4).create().unwrap();
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `count` is never used
[INFO] [stdout]   --> src/bin/ch_6_select.rs:70:10
[INFO] [stdout]    |
[INFO] [stdout] 70 | async fn count() {
[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 `add_two_streams` is never used
[INFO] [stdout]   --> src/bin/ch_6_select.rs:94:10
[INFO] [stdout]    |
[INFO] [stdout] 94 | async fn add_two_streams(
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `thread_pool_executor` is never used
[INFO] [stdout]    --> src/bin/ch_6_select.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn thread_pool_executor() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tokio_runtime` is never used
[INFO] [stdout]    --> src/bin/ch_6_select.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 | fn tokio_runtime() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.42s
[INFO] running `Command { std: "docker" "inspect" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da", kill_on_drop: false }`
[INFO] [stdout] d5d0a36fcabeb56a4d4aadd51d37cf82669c3106009b8845678c33cdc57653da
