[INFO] cloning repository https://github.com/mmanum/tokio-async-await-samples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mmanum/tokio-async-await-samples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmanum%2Ftokio-async-await-samples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmanum%2Ftokio-async-await-samples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 037f553b46d9e7d3d48832fbfa2d88be5c2069fd
[INFO] testing mmanum/tokio-async-await-samples against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmmanum%2Ftokio-async-await-samples" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/mmanum/tokio-async-await-samples
[INFO] finished tweaking git repo https://github.com/mmanum/tokio-async-await-samples
[INFO] tweaked toml for git repo https://github.com/mmanum/tokio-async-await-samples written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/mmanum/tokio-async-await-samples on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/mmanum/tokio-async-await-samples 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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0ae82d6f5b5e2f0f690ddb5d40ab43268c8dcb3a7dae1a16315a78ca03119641
[INFO] running `Command { std: "docker" "start" "-a" "0ae82d6f5b5e2f0f690ddb5d40ab43268c8dcb3a7dae1a16315a78ca03119641", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0ae82d6f5b5e2f0f690ddb5d40ab43268c8dcb3a7dae1a16315a78ca03119641", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ae82d6f5b5e2f0f690ddb5d40ab43268c8dcb3a7dae1a16315a78ca03119641", kill_on_drop: false }`
[INFO] [stdout] 0ae82d6f5b5e2f0f690ddb5d40ab43268c8dcb3a7dae1a16315a78ca03119641
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb064d1ad6a1f212ea36295bd093d9ad7899b8ffb07075ce9475ef25c22e7432
[INFO] running `Command { std: "docker" "start" "-a" "fb064d1ad6a1f212ea36295bd093d9ad7899b8ffb07075ce9475ef25c22e7432", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.44
[INFO] [stderr]    Compiling libc v0.2.180
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling futures-sink v0.3.31
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling futures-io v0.3.31
[INFO] [stderr]    Compiling slab v0.4.12
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling lock_api v0.4.14
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling syn v2.0.114
[INFO] [stderr]    Compiling signal-hook-registry v1.4.7
[INFO] [stderr]    Compiling socket2 v0.6.1
[INFO] [stderr]    Compiling mio v1.1.1
[INFO] [stderr]    Compiling parking_lot v0.12.5
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling tokio-macros v2.6.0
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling tokio v1.49.0
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling tokio-async-await-samples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `FutureExt` and `TryStreamExt`
[INFO] [stdout]  --> src/exercise_07b.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use futures::{FutureExt, TryStreamExt};
[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: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_07b.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 | use futures::stream::{FuturesUnordered, StreamExt};
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future`
[INFO] [stdout]   --> src/exercise_09a.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use futures::future;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_09a.rs:11:29
[INFO] [stdout]    |
[INFO] [stdout] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future`
[INFO] [stdout]   --> src/exercise_09b.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use futures::future;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_09b.rs:11:29
[INFO] [stdout]    |
[INFO] [stdout] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AsyncReadExt` and `AsyncWriteExt`
[INFO] [stdout]   --> src/main.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]    |                 ^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tokio::net::TcpListener;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `default`
[INFO] [stdout]   --> src/main.rs:97:15
[INFO] [stdout]    |
[INFO] [stdout] 97 |         #[cfg(feature = "default")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `ex00`, `ex01`, `ex02`, `ex03`, `ex04`, `ex05`, `ex06`, `ex07a`, `ex07b`, `ex08`, `ex09a`, and `ex09b`
[INFO] [stdout]    = help: consider adding `default` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09a.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut deadline = sleep(Duration::from_millis(4_000));
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09a.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut finished = stream::iter(delays)
[INFO] [stdout]    |         ----^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09b.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut deadline = sleep(Duration::from_millis(4_000));
[INFO] [stdout]    |         ----^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/exercise_00.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     for index in 1..50 {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_00.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[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 `calculate` is never used
[INFO] [stdout]   --> src/exercise_00.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn calculate() {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_01.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `saludar` is never used
[INFO] [stdout]   --> src/exercise_01.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn saludar(name: &str) -> String {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_02.rs:43:14
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `esperar_y_devolver` is never used
[INFO] [stdout]   --> src/exercise_02.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_03.rs:26:14
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `esperar_y_devolver` is never used
[INFO] [stdout]   --> src/exercise_03.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_04.rs:43:14
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_tasks` is never used
[INFO] [stdout]   --> src/exercise_04.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn my_tasks(ms: u64, label: &str) -> Result<String, &'static str> {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show` is never used
[INFO] [stdout]   --> src/exercise_04.rs:64:10
[INFO] [stdout]    |
[INFO] [stdout] 64 | async fn show(label: String, handle: JoinHandle<Result<String, &'static str>>) {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_05.rs:26:14
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `with_timeout` is never used
[INFO] [stdout]   --> src/exercise_05.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | async fn with_timeout(ms: u64, ms_timeout: u64) -> Result<String, String> {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_06.rs:22:14
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `wait_return` is never used
[INFO] [stdout]   --> src/exercise_06.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 | async fn wait_return(delay: u64, label: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `carrera_futures` is never used
[INFO] [stdout]   --> src/exercise_06.rs:44:10
[INFO] [stdout]    |
[INFO] [stdout] 44 | async fn carrera_futures() -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `carrera_tasks` is never used
[INFO] [stdout]   --> src/exercise_06.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn carrera_tasks() -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_07a.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sleeping` is never used
[INFO] [stdout]   --> src/exercise_07a.rs:31:10
[INFO] [stdout]    |
[INFO] [stdout] 31 | async fn sleeping(delay: u64) -> String {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_07b.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sleeping` is never used
[INFO] [stdout]   --> src/exercise_07b.rs:61:10
[INFO] [stdout]    |
[INFO] [stdout] 61 | async fn sleeping(delay: u64) -> String {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_08.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `runa` is never used
[INFO] [stdout]   --> src/exercise_08.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub async fn runa() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_08.rs:71:14
[INFO] [stdout]    |
[INFO] [stdout] 71 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_08.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:48:10
[INFO] [stdout]    |
[INFO] [stdout] 48 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         wait_return(300, "A".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         wait_return(300, "AA".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         wait_return(299, "B".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |         wait_return(299, "BBB".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.20s
[INFO] running `Command { std: "docker" "inspect" "fb064d1ad6a1f212ea36295bd093d9ad7899b8ffb07075ce9475ef25c22e7432", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb064d1ad6a1f212ea36295bd093d9ad7899b8ffb07075ce9475ef25c22e7432", kill_on_drop: false }`
[INFO] [stdout] fb064d1ad6a1f212ea36295bd093d9ad7899b8ffb07075ce9475ef25c22e7432
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0462149dba20fde333f30f0539e750e5f3fa2eaef098f3a284be1927d9126e0
[INFO] running `Command { std: "docker" "start" "-a" "b0462149dba20fde333f30f0539e750e5f3fa2eaef098f3a284be1927d9126e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio-async-await-samples v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `FutureExt` and `TryStreamExt`
[INFO] [stdout]  --> src/exercise_07b.rs:1:15
[INFO] [stdout]   |
[INFO] [stdout] 1 | use futures::{FutureExt, TryStreamExt};
[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: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_07b.rs:14:23
[INFO] [stdout]    |
[INFO] [stdout] 14 | use futures::stream::{FuturesUnordered, StreamExt};
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future`
[INFO] [stdout]   --> src/exercise_09a.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use futures::future;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_09a.rs:11:29
[INFO] [stdout]    |
[INFO] [stdout] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `futures::future`
[INFO] [stdout]   --> src/exercise_09b.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use futures::future;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FuturesUnordered`
[INFO] [stdout]   --> src/exercise_09b.rs:11:29
[INFO] [stdout]    |
[INFO] [stdout] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AsyncReadExt` and `AsyncWriteExt`
[INFO] [stdout]   --> src/main.rs:16:17
[INFO] [stdout]    |
[INFO] [stdout] 16 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stdout]    |                 ^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tokio::net::TcpListener`
[INFO] [stdout]   --> src/main.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 | use tokio::net::TcpListener;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unexpected `cfg` condition value: `default`
[INFO] [stdout]   --> src/main.rs:97:15
[INFO] [stdout]    |
[INFO] [stdout] 97 |         #[cfg(feature = "default")]
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected values for `feature` are: `ex00`, `ex01`, `ex02`, `ex03`, `ex04`, `ex05`, `ex06`, `ex07a`, `ex07b`, `ex08`, `ex09a`, and `ex09b`
[INFO] [stdout]    = help: consider adding `default` as a feature in `Cargo.toml`
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09a.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let mut deadline = sleep(Duration::from_millis(4_000));
[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: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09a.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut finished = stream::iter(delays)
[INFO] [stdout]    |         ----^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/exercise_09b.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let mut deadline = sleep(Duration::from_millis(4_000));
[INFO] [stdout]    |         ----^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/exercise_00.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     for index in 1..50 {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_00.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[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 `calculate` is never used
[INFO] [stdout]   --> src/exercise_00.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn calculate() {
[INFO] [stdout]    |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_01.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `saludar` is never used
[INFO] [stdout]   --> src/exercise_01.rs:26:10
[INFO] [stdout]    |
[INFO] [stdout] 26 | async fn saludar(name: &str) -> String {
[INFO] [stdout]    |          ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_02.rs:43:14
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `esperar_y_devolver` is never used
[INFO] [stdout]   --> src/exercise_02.rs:53:10
[INFO] [stdout]    |
[INFO] [stdout] 53 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_03.rs:26:14
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `esperar_y_devolver` is never used
[INFO] [stdout]   --> src/exercise_03.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_04.rs:43:14
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `my_tasks` is never used
[INFO] [stdout]   --> src/exercise_04.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn my_tasks(ms: u64, label: &str) -> Result<String, &'static str> {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `show` is never used
[INFO] [stdout]   --> src/exercise_04.rs:64:10
[INFO] [stdout]    |
[INFO] [stdout] 64 | async fn show(label: String, handle: JoinHandle<Result<String, &'static str>>) {
[INFO] [stdout]    |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_05.rs:26:14
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `with_timeout` is never used
[INFO] [stdout]   --> src/exercise_05.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | async fn with_timeout(ms: u64, ms_timeout: u64) -> Result<String, String> {
[INFO] [stdout]    |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_06.rs:22:14
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub async fn run() {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `wait_return` is never used
[INFO] [stdout]   --> src/exercise_06.rs:38:10
[INFO] [stdout]    |
[INFO] [stdout] 38 | async fn wait_return(delay: u64, label: String) -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `carrera_futures` is never used
[INFO] [stdout]   --> src/exercise_06.rs:44:10
[INFO] [stdout]    |
[INFO] [stdout] 44 | async fn carrera_futures() -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `carrera_tasks` is never used
[INFO] [stdout]   --> src/exercise_06.rs:54:10
[INFO] [stdout]    |
[INFO] [stdout] 54 | async fn carrera_tasks() -> String {
[INFO] [stdout]    |          ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_07a.rs:14:14
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sleeping` is never used
[INFO] [stdout]   --> src/exercise_07a.rs:31:10
[INFO] [stdout]    |
[INFO] [stdout] 31 | async fn sleeping(delay: u64) -> String {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_07b.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sleeping` is never used
[INFO] [stdout]   --> src/exercise_07b.rs:61:10
[INFO] [stdout]    |
[INFO] [stdout] 61 | async fn sleeping(delay: u64) -> String {
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_08.rs:43:8
[INFO] [stdout]    |
[INFO] [stdout] 43 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `runa` is never used
[INFO] [stdout]   --> src/exercise_08.rs:45:14
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub async fn runa() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_08.rs:71:14
[INFO] [stdout]    |
[INFO] [stdout] 71 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_08.rs:87:10
[INFO] [stdout]    |
[INFO] [stdout] 87 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_09a.rs:48:10
[INFO] [stdout]    |
[INFO] [stdout] 48 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:15:8
[INFO] [stdout]    |
[INFO] [stdout] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:17:14
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `job` is never used
[INFO] [stdout]   --> src/exercise_09b.rs:59:10
[INFO] [stdout]    |
[INFO] [stdout] 59 | async fn job(ms: u64) -> String {
[INFO] [stdout]    |          ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |         wait_return(300, "A".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         wait_return(300, "AA".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         wait_return(299, "B".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused implementer of `futures::Future` that must be used
[INFO] [stdout]   --> src/exercise_06.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |         wait_return(299, "BBB".to_string());
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.17s
[INFO] running `Command { std: "docker" "inspect" "b0462149dba20fde333f30f0539e750e5f3fa2eaef098f3a284be1927d9126e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0462149dba20fde333f30f0539e750e5f3fa2eaef098f3a284be1927d9126e0", kill_on_drop: false }`
[INFO] [stdout] b0462149dba20fde333f30f0539e750e5f3fa2eaef098f3a284be1927d9126e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a0e0f993ba203318bb9b310375f87250e5154193feead1674f1c31a279bef9da
[INFO] running `Command { std: "docker" "start" "-a" "a0e0f993ba203318bb9b310375f87250e5154193feead1674f1c31a279bef9da", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `FutureExt` and `TryStreamExt`
[INFO] [stderr]  --> src/exercise_07b.rs:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | use futures::{FutureExt, TryStreamExt};
[INFO] [stderr]   |               ^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `FuturesUnordered`
[INFO] [stderr]   --> src/exercise_07b.rs:14:23
[INFO] [stderr]    |
[INFO] [stderr] 14 | use futures::stream::{FuturesUnordered, StreamExt};
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::future`
[INFO] [stderr]   --> src/exercise_09a.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use futures::future;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `FuturesUnordered`
[INFO] [stderr]   --> src/exercise_09a.rs:11:29
[INFO] [stderr]    |
[INFO] [stderr] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `futures::future`
[INFO] [stderr]   --> src/exercise_09b.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use futures::future;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `FuturesUnordered`
[INFO] [stderr]   --> src/exercise_09b.rs:11:29
[INFO] [stderr]    |
[INFO] [stderr] 11 | use futures::stream::{self, FuturesUnordered, StreamExt};
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `AsyncReadExt` and `AsyncWriteExt`
[INFO] [stderr]   --> src/main.rs:16:17
[INFO] [stderr]    |
[INFO] [stderr] 16 | use tokio::io::{AsyncReadExt, AsyncWriteExt};
[INFO] [stderr]    |                 ^^^^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::net::TcpListener`
[INFO] [stderr]   --> src/main.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 | use tokio::net::TcpListener;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unexpected `cfg` condition value: `default`
[INFO] [stderr]   --> src/main.rs:97:15
[INFO] [stderr]    |
[INFO] [stderr] 97 |         #[cfg(feature = "default")]
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: expected values for `feature` are: `ex00`, `ex01`, `ex02`, `ex03`, `ex04`, `ex05`, `ex06`, `ex07a`, `ex07b`, `ex08`, `ex09a`, and `ex09b`
[INFO] [stderr]    = help: consider adding `default` as a feature in `Cargo.toml`
[INFO] [stderr]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stderr]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/exercise_09a.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let mut deadline = sleep(Duration::from_millis(4_000));
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/exercise_09a.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let mut finished = stream::iter(delays)
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/exercise_09b.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let mut deadline = sleep(Duration::from_millis(4_000));
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/exercise_00.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |     for index in 1..50 {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_00.rs:20:14
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `calculate` is never used
[INFO] [stderr]   --> src/exercise_00.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 | async fn calculate() {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_01.rs:20:14
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `saludar` is never used
[INFO] [stderr]   --> src/exercise_01.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 | async fn saludar(name: &str) -> String {
[INFO] [stderr]    |          ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_02.rs:43:14
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `esperar_y_devolver` is never used
[INFO] [stderr]   --> src/exercise_02.rs:53:10
[INFO] [stderr]    |
[INFO] [stderr] 53 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_03.rs:26:14
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `esperar_y_devolver` is never used
[INFO] [stderr]   --> src/exercise_03.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 | async fn esperar_y_devolver(delay: u64, etiqueta: String) -> String {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_04.rs:43:14
[INFO] [stderr]    |
[INFO] [stderr] 43 | pub async fn run() {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `my_tasks` is never used
[INFO] [stderr]   --> src/exercise_04.rs:54:10
[INFO] [stderr]    |
[INFO] [stderr] 54 | async fn my_tasks(ms: u64, label: &str) -> Result<String, &'static str> {
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `show` is never used
[INFO] [stderr]   --> src/exercise_04.rs:64:10
[INFO] [stderr]    |
[INFO] [stderr] 64 | async fn show(label: String, handle: JoinHandle<Result<String, &'static str>>) {
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_05.rs:26:14
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub async fn run() {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `with_timeout` is never used
[INFO] [stderr]   --> src/exercise_05.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | async fn with_timeout(ms: u64, ms_timeout: u64) -> Result<String, String> {
[INFO] [stderr]    |          ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_06.rs:22:14
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub async fn run() {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `wait_return` is never used
[INFO] [stderr]   --> src/exercise_06.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 | async fn wait_return(delay: u64, label: String) -> String {
[INFO] [stderr]    |          ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `carrera_futures` is never used
[INFO] [stderr]   --> src/exercise_06.rs:44:10
[INFO] [stderr]    |
[INFO] [stderr] 44 | async fn carrera_futures() -> String {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `carrera_tasks` is never used
[INFO] [stderr]   --> src/exercise_06.rs:54:10
[INFO] [stderr]    |
[INFO] [stderr] 54 | async fn carrera_tasks() -> String {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_07a.rs:14:14
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sleeping` is never used
[INFO] [stderr]   --> src/exercise_07a.rs:31:10
[INFO] [stderr]    |
[INFO] [stderr] 31 | async fn sleeping(delay: u64) -> String {
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_07b.rs:16:14
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sleeping` is never used
[INFO] [stderr]   --> src/exercise_07b.rs:61:10
[INFO] [stderr]    |
[INFO] [stderr] 61 | async fn sleeping(delay: u64) -> String {
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stderr]   --> src/exercise_08.rs:43:8
[INFO] [stderr]    |
[INFO] [stderr] 43 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `runa` is never used
[INFO] [stderr]   --> src/exercise_08.rs:45:14
[INFO] [stderr]    |
[INFO] [stderr] 45 | pub async fn runa() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_08.rs:71:14
[INFO] [stderr]    |
[INFO] [stderr] 71 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `job` is never used
[INFO] [stderr]   --> src/exercise_08.rs:87:10
[INFO] [stderr]    |
[INFO] [stderr] 87 | async fn job(ms: u64) -> String {
[INFO] [stderr]    |          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stderr]   --> src/exercise_09a.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_09a.rs:17:14
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `job` is never used
[INFO] [stderr]   --> src/exercise_09a.rs:48:10
[INFO] [stderr]    |
[INFO] [stderr] 48 | async fn job(ms: u64) -> String {
[INFO] [stderr]    |          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: static `MAX_CONCURRENCY` is never used
[INFO] [stderr]   --> src/exercise_09b.rs:15:8
[INFO] [stderr]    |
[INFO] [stderr] 15 | static MAX_CONCURRENCY: usize = 3usize;
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run` is never used
[INFO] [stderr]   --> src/exercise_09b.rs:17:14
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `job` is never used
[INFO] [stderr]   --> src/exercise_09b.rs:59:10
[INFO] [stderr]    |
[INFO] [stderr] 59 | async fn job(ms: u64) -> String {
[INFO] [stderr]    |          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused implementer of `futures::Future` that must be used
[INFO] [stderr]   --> src/exercise_06.rs:56:9
[INFO] [stderr]    |
[INFO] [stderr] 56 |         wait_return(300, "A".to_string());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused implementer of `futures::Future` that must be used
[INFO] [stderr]   --> src/exercise_06.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         wait_return(300, "AA".to_string());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stderr] 
[INFO] [stderr] warning: unused implementer of `futures::Future` that must be used
[INFO] [stderr]   --> src/exercise_06.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |         wait_return(299, "B".to_string());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stderr] 
[INFO] [stderr] warning: unused implementer of `futures::Future` that must be used
[INFO] [stderr]   --> src/exercise_06.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 |         wait_return(299, "BBB".to_string());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: futures do nothing unless you `.await` or poll them
[INFO] [stderr] 
[INFO] [stderr] warning: `tokio-async-await-samples` (bin "tokio-async-await-samples" test) generated 48 warnings (run `cargo fix --bin "tokio-async-await-samples" -p tokio-async-await-samples --tests` to apply 12 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/tokio_async_await_samples-45f750ce8cf2859a)
[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" "a0e0f993ba203318bb9b310375f87250e5154193feead1674f1c31a279bef9da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0e0f993ba203318bb9b310375f87250e5154193feead1674f1c31a279bef9da", kill_on_drop: false }`
[INFO] [stdout] a0e0f993ba203318bb9b310375f87250e5154193feead1674f1c31a279bef9da
