[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] checking PhilipDaniels/async-std-demo against master#ba72b15666b2491415aec703a02c2364fe5e2790 for pr-71140
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPhilipDaniels%2Fasync-std-demo" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/PhilipDaniels/async-std-demo on toolchain ba72b15666b2491415aec703a02c2364fe5e2790
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ba72b15666b2491415aec703a02c2364fe5e2790" "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-7/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" "+ba72b15666b2491415aec703a02c2364fe5e2790" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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=forbid" "-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" "+ba72b15666b2491415aec703a02c2364fe5e2790" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] df606b6ce54cbaf812066768b9cdeda21895a42e72beeea0d7eb08ad96aca864
[INFO] running `"docker" "start" "-a" "df606b6ce54cbaf812066768b9cdeda21895a42e72beeea0d7eb08ad96aca864"`
[INFO] [stderr]    Compiling libz-sys v1.0.25
[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]     Checking async-macros v2.0.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]     Checking serde_json v1.0.42
[INFO] [stderr]     Checking http v0.1.20
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]     Checking async-std v1.2.0
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]    Compiling curl v0.4.25
[INFO] [stderr]    Compiling isahc v0.7.6
[INFO] [stderr]     Checking surf v1.0.3
[INFO] [stderr]     Checking 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] 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 39.34s
[INFO] running `"docker" "inspect" "df606b6ce54cbaf812066768b9cdeda21895a42e72beeea0d7eb08ad96aca864"`
[INFO] running `"docker" "rm" "-f" "df606b6ce54cbaf812066768b9cdeda21895a42e72beeea0d7eb08ad96aca864"`
[INFO] [stdout] df606b6ce54cbaf812066768b9cdeda21895a42e72beeea0d7eb08ad96aca864