[INFO] updating cached repository https://github.com/PhilipDaniels/async-std-demo
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c595a3e938b6d6a1831927bd376980a83d07d52e
[INFO] testing PhilipDaniels/async-std-demo against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPhilipDaniels%2Fasync-std-demo" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PhilipDaniels/async-std-demo on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/PhilipDaniels/async-std-demo
[INFO] finished tweaking git repo https://github.com/PhilipDaniels/async-std-demo
[INFO] tweaked toml for git repo https://github.com/PhilipDaniels/async-std-demo written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/PhilipDaniels/async-std-demo already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bab655747342557dcb11dcbe3847de907b9f98c3027dee4ac4d2028bc7435bda
[INFO] running `"docker" "start" "-a" "bab655747342557dcb11dcbe3847de907b9f98c3027dee4ac4d2028bc7435bda"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-io-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-sink v0.3.1
[INFO] [stderr]    Compiling isahc v0.7.6
[INFO] [stderr]    Compiling futures-timer v2.0.2
[INFO] [stderr]    Compiling libnghttp2-sys v0.1.2
[INFO] [stderr]    Compiling openssl-sys v0.9.53
[INFO] [stderr]    Compiling curl-sys v0.4.24
[INFO] [stderr]    Compiling async-macros v2.0.0
[INFO] [stderr]    Compiling async-task v1.0.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling serde_json v1.0.42
[INFO] [stderr]    Compiling http v0.1.20
[INFO] [stderr]    Compiling serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling futures-channel v0.3.1
[INFO] [stderr]    Compiling futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling sluice v0.4.2
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling mio v0.6.21
[INFO] [stderr]    Compiling kv-log-macro v1.0.4
[INFO] [stderr]    Compiling futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling futures-executor-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling futures-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling async-std v1.2.0
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]    Compiling curl v0.4.25
[INFO] [stderr]    Compiling futures-util v0.3.1
[INFO] [stderr]    Compiling surf v1.0.3
[INFO] [stderr]    Compiling futures-executor v0.3.1
[INFO] [stderr]    Compiling futures v0.3.1
[INFO] [stderr]    Compiling asss v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:194:20
[INFO] [stderr]     |
[INFO] [stderr] 194 |                 Ok(body) => {
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:210:20
[INFO] [stderr]     |
[INFO] [stderr] 210 |                 Ok(body) => { // Possibly do something useful with the body of the request here.
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_two_async_fns`
[INFO] [stderr]   --> src/main.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn demo_waiting_for_two_async_fns() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call_both_sleepers`
[INFO] [stderr]   --> src/main.rs:28:10
[INFO] [stderr]    |
[INFO] [stderr] 28 | async fn call_both_sleepers() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_sleeper`
[INFO] [stderr]   --> src/main.rs:32:10
[INFO] [stderr]    |
[INFO] [stderr] 32 | async fn first_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `second_sleeper`
[INFO] [stderr]   --> src/main.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 | async fn second_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print`
[INFO] [stderr]   --> src/main.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | async fn sleep_and_print(future_number: u32, sleep_millis: u64) {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps`
[INFO] [stderr]   --> src/main.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn demo_waiting_for_multiple_random_sleeps() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_value`
[INFO] [stderr]   --> src/main.rs:80:10
[INFO] [stderr]    |
[INFO] [stderr] 80 | async fn sleep_and_print_and_return_value(future_number: u32, sleep_millis: u64) -> u32 {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_return_values`
[INFO] [stderr]   --> src/main.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn demo_waiting_for_multiple_random_sleeps_with_return_values() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_error`
[INFO] [stderr]    --> src/main.rs:111:10
[INFO] [stderr]     |
[INFO] [stderr] 111 | async fn sleep_and_print_and_return_error(future_number: u32, sleep_millis: u64) -> Result<u32, String> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_errors`
[INFO] [stderr]    --> src/main.rs:123:4
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn demo_waiting_for_multiple_random_sleeps_with_errors() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_downloading_urls_on_one_thread`
[INFO] [stderr]    --> src/main.rs:184:4
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn demo_downloading_urls_on_one_thread() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 11s
[INFO] running `"docker" "inspect" "bab655747342557dcb11dcbe3847de907b9f98c3027dee4ac4d2028bc7435bda"`
[INFO] running `"docker" "rm" "-f" "bab655747342557dcb11dcbe3847de907b9f98c3027dee4ac4d2028bc7435bda"`
[INFO] [stdout] bab655747342557dcb11dcbe3847de907b9f98c3027dee4ac4d2028bc7435bda
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 782963c469c94856d63c0b6a61b6d78d0c87d3c71ca61eeeb27fe556225bf980
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "782963c469c94856d63c0b6a61b6d78d0c87d3c71ca61eeeb27fe556225bf980"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling asss v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:194:20
[INFO] [stderr]     |
[INFO] [stderr] 194 |                 Ok(body) => {
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:210:20
[INFO] [stderr]     |
[INFO] [stderr] 210 |                 Ok(body) => { // Possibly do something useful with the body of the request here.
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_two_async_fns`
[INFO] [stderr]   --> src/main.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn demo_waiting_for_two_async_fns() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call_both_sleepers`
[INFO] [stderr]   --> src/main.rs:28:10
[INFO] [stderr]    |
[INFO] [stderr] 28 | async fn call_both_sleepers() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_sleeper`
[INFO] [stderr]   --> src/main.rs:32:10
[INFO] [stderr]    |
[INFO] [stderr] 32 | async fn first_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `second_sleeper`
[INFO] [stderr]   --> src/main.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 | async fn second_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print`
[INFO] [stderr]   --> src/main.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | async fn sleep_and_print(future_number: u32, sleep_millis: u64) {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps`
[INFO] [stderr]   --> src/main.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn demo_waiting_for_multiple_random_sleeps() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_value`
[INFO] [stderr]   --> src/main.rs:80:10
[INFO] [stderr]    |
[INFO] [stderr] 80 | async fn sleep_and_print_and_return_value(future_number: u32, sleep_millis: u64) -> u32 {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_return_values`
[INFO] [stderr]   --> src/main.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn demo_waiting_for_multiple_random_sleeps_with_return_values() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_error`
[INFO] [stderr]    --> src/main.rs:111:10
[INFO] [stderr]     |
[INFO] [stderr] 111 | async fn sleep_and_print_and_return_error(future_number: u32, sleep_millis: u64) -> Result<u32, String> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_errors`
[INFO] [stderr]    --> src/main.rs:123:4
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn demo_waiting_for_multiple_random_sleeps_with_errors() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_downloading_urls_on_one_thread`
[INFO] [stderr]    --> src/main.rs:184:4
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn demo_downloading_urls_on_one_thread() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `"docker" "inspect" "782963c469c94856d63c0b6a61b6d78d0c87d3c71ca61eeeb27fe556225bf980"`
[INFO] running `"docker" "rm" "-f" "782963c469c94856d63c0b6a61b6d78d0c87d3c71ca61eeeb27fe556225bf980"`
[INFO] [stdout] 782963c469c94856d63c0b6a61b6d78d0c87d3c71ca61eeeb27fe556225bf980
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stdout] 5dfc929f28e4bf6e2e062cd49ff4c3b957aa89be86f49d952e13acd2edaacc19
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "5dfc929f28e4bf6e2e062cd49ff4c3b957aa89be86f49d952e13acd2edaacc19"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:194:20
[INFO] [stderr]     |
[INFO] [stderr] 194 |                 Ok(body) => {
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/main.rs:210:20
[INFO] [stderr]     |
[INFO] [stderr] 210 |                 Ok(body) => { // Possibly do something useful with the body of the request here.
[INFO] [stderr]     |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_two_async_fns`
[INFO] [stderr]   --> src/main.rs:21:4
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn demo_waiting_for_two_async_fns() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `call_both_sleepers`
[INFO] [stderr]   --> src/main.rs:28:10
[INFO] [stderr]    |
[INFO] [stderr] 28 | async fn call_both_sleepers() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_sleeper`
[INFO] [stderr]   --> src/main.rs:32:10
[INFO] [stderr]    |
[INFO] [stderr] 32 | async fn first_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `second_sleeper`
[INFO] [stderr]   --> src/main.rs:36:10
[INFO] [stderr]    |
[INFO] [stderr] 36 | async fn second_sleeper() {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print`
[INFO] [stderr]   --> src/main.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | async fn sleep_and_print(future_number: u32, sleep_millis: u64) {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps`
[INFO] [stderr]   --> src/main.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn demo_waiting_for_multiple_random_sleeps() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_value`
[INFO] [stderr]   --> src/main.rs:80:10
[INFO] [stderr]    |
[INFO] [stderr] 80 | async fn sleep_and_print_and_return_value(future_number: u32, sleep_millis: u64) -> u32 {
[INFO] [stderr]    |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_return_values`
[INFO] [stderr]   --> src/main.rs:88:4
[INFO] [stderr]    |
[INFO] [stderr] 88 | fn demo_waiting_for_multiple_random_sleeps_with_return_values() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sleep_and_print_and_return_error`
[INFO] [stderr]    --> src/main.rs:111:10
[INFO] [stderr]     |
[INFO] [stderr] 111 | async fn sleep_and_print_and_return_error(future_number: u32, sleep_millis: u64) -> Result<u32, String> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_waiting_for_multiple_random_sleeps_with_errors`
[INFO] [stderr]    --> src/main.rs:123:4
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn demo_waiting_for_multiple_random_sleeps_with_errors() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `demo_downloading_urls_on_one_thread`
[INFO] [stderr]    --> src/main.rs:184:4
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn demo_downloading_urls_on_one_thread() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.34s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/asss-01684f999cd78c60
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "5dfc929f28e4bf6e2e062cd49ff4c3b957aa89be86f49d952e13acd2edaacc19"`
[INFO] running `"docker" "rm" "-f" "5dfc929f28e4bf6e2e062cd49ff4c3b957aa89be86f49d952e13acd2edaacc19"`
[INFO] [stdout] 5dfc929f28e4bf6e2e062cd49ff4c3b957aa89be86f49d952e13acd2edaacc19