[INFO] cloning repository https://github.com/Xiejinhua123/rust-demo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Xiejinhua123/rust-demo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiejinhua123%2Frust-demo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiejinhua123%2Frust-demo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7b3c3db293ce62a8c9024b310b8f49a81a827d1e
[INFO] testing Xiejinhua123/rust-demo against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FXiejinhua123%2Frust-demo" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Xiejinhua123/rust-demo on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Xiejinhua123/rust-demo
[INFO] finished tweaking git repo https://github.com/Xiejinhua123/rust-demo
[INFO] tweaked toml for git repo https://github.com/Xiejinhua123/rust-demo written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Xiejinhua123/rust-demo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.systemstat
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded bytesize v1.0.1
[INFO] [stderr]   Downloaded lexical v5.2.1
[INFO] [stderr]   Downloaded rust_decimal v1.10.3
[INFO] [stderr]   Downloaded systemstat v0.1.7
[INFO] running `Command { std: "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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d0d35931f4599adb12aea3914fe221067560585cbd7442065297b032b4082017
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d0d35931f4599adb12aea3914fe221067560585cbd7442065297b032b4082017", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d0d35931f4599adb12aea3914fe221067560585cbd7442065297b032b4082017", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0d35931f4599adb12aea3914fe221067560585cbd7442065297b032b4082017", kill_on_drop: false }`
[INFO] [stdout] d0d35931f4599adb12aea3914fe221067560585cbd7442065297b032b4082017
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 939831727f13a0e7392e0ee2e3310a0999aae597f9f626465e4fbbc8b09e018a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "939831727f13a0e7392e0ee2e3310a0999aae597f9f626465e4fbbc8b09e018a", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.systemstat
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling syn v1.0.65
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling once_cell v1.7.2
[INFO] [stderr]    Compiling futures-sink v0.3.13
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling smallvec v1.6.1
[INFO] [stderr]    Compiling futures-core v0.3.13
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling ahash v0.4.7
[INFO] [stderr]    Compiling static_assertions v1.1.0
[INFO] [stderr]    Compiling lexical-core v0.7.5
[INFO] [stderr]    Compiling futures-task v0.3.13
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling futures-io v0.3.13
[INFO] [stderr]    Compiling radium v0.5.3
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling regex-syntax v0.6.23
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]    Compiling mysql v20.1.0
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling time v0.2.25
[INFO] [stderr]    Compiling nom v6.1.2
[INFO] [stderr]    Compiling instant v0.1.9
[INFO] [stderr]    Compiling lock_api v0.4.2
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling futures-channel v0.3.13
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling http v0.2.3
[INFO] [stderr]    Compiling form_urlencoded v1.0.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling tokio v1.4.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling io-enum v0.2.6
[INFO] [stderr]    Compiling encoding_rs v0.8.28
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling generic-array v0.12.4
[INFO] [stderr]    Compiling openssl-sys v0.9.61
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling lru v0.6.5
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling tracing v0.1.25
[INFO] [stderr]    Compiling url v2.2.1
[INFO] [stderr]    Compiling bitvec v0.19.5
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling sha2 v0.8.2
[INFO] [stderr]    Compiling openssl v0.10.33
[INFO] [stderr]    Compiling native-tls v0.2.7
[INFO] [stderr]    Compiling parking_lot_core v0.8.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling mio v0.7.11
[INFO] [stderr]    Compiling signal-hook-registry v1.3.0
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling socket2 v0.4.0
[INFO] [stderr]    Compiling flate2 v1.0.20
[INFO] [stderr]    Compiling socket2 v0.3.19
[INFO] [stderr]    Compiling nix v0.19.1
[INFO] [stderr]    Compiling rust_decimal v1.10.3
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling parking_lot v0.11.1
[INFO] [stderr]    Compiling regex v1.4.5
[INFO] [stderr]    Compiling http-body v0.4.1
[INFO] [stderr]    Compiling lexical v5.2.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling bigdecimal v0.1.2
[INFO] [stderr]    Compiling twox-hash v1.6.0
[INFO] [stderr]    Compiling pem v0.8.3
[INFO] [stderr]    Compiling derive_utils v0.11.2
[INFO] [stderr]    Compiling systemstat v0.1.7
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]    Compiling futures-macro v0.3.13
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling pin-project-internal v1.0.6
[INFO] [stderr]    Compiling futures-util v0.3.13
[INFO] [stderr]    Compiling time-macros v0.1.1
[INFO] [stderr]    Compiling pin-project v1.0.6
[INFO] [stderr]    Compiling mysql_common v0.24.1
[INFO] [stderr]    Compiling futures-executor v0.3.13
[INFO] [stderr]    Compiling futures v0.3.13
[INFO] [stderr]    Compiling tokio-util v0.6.5
[INFO] [stderr]    Compiling tokio-native-tls v0.3.0
[INFO] [stderr]    Compiling h2 v0.3.2
[INFO] [stderr]    Compiling hyper v0.14.5
[INFO] [stderr]    Compiling hyper-tls v0.5.0
[INFO] [stderr]    Compiling reqwest v0.11.2
[INFO] [stderr]    Compiling rust-demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `ptr::null`
[INFO] [stdout]  --> src/main.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{fs::{self, OpenOptions}, io::Write, ptr::null, thread};
[INFO] [stdout]   |                                               ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `need_num`
[INFO] [stdout]   --> src/main.rs:27:10
[INFO] [stdout]    |
[INFO] [stdout] 27 |      let need_num = ["0","1","2","3","4","5","6","7","8","9"];
[INFO] [stdout]    |          ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_need_num`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ball`
[INFO] [stdout]   --> src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 | async fn ball(){
[INFO] [stdout]    |          ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `substr`
[INFO] [stdout]   --> src/main.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn substr(s: &str, start: usize, length: usize) -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `system_monitor`
[INFO] [stdout]   --> src/main.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn system_monitor() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 20s
[INFO] running `Command { std: "docker" "inspect" "939831727f13a0e7392e0ee2e3310a0999aae597f9f626465e4fbbc8b09e018a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "939831727f13a0e7392e0ee2e3310a0999aae597f9f626465e4fbbc8b09e018a", kill_on_drop: false }`
[INFO] [stdout] 939831727f13a0e7392e0ee2e3310a0999aae597f9f626465e4fbbc8b09e018a
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0a6ba3b2a5b3a83d3cdb8a1dfba5be47ebf4d21545ee29564ff956f6409b607f
[INFO] running `Command { std: "docker" "start" "-a" "0a6ba3b2a5b3a83d3cdb8a1dfba5be47ebf4d21545ee29564ff956f6409b607f", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.systemstat
[INFO] [stderr]    Compiling rust-demo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `ptr::null`
[INFO] [stdout]  --> src/main.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{fs::{self, OpenOptions}, io::Write, ptr::null, thread};
[INFO] [stdout]   |                                               ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `need_num`
[INFO] [stdout]   --> src/main.rs:27:10
[INFO] [stdout]    |
[INFO] [stdout] 27 |      let need_num = ["0","1","2","3","4","5","6","7","8","9"];
[INFO] [stdout]    |          ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_need_num`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ball`
[INFO] [stdout]   --> src/main.rs:23:10
[INFO] [stdout]    |
[INFO] [stdout] 23 | async fn ball(){
[INFO] [stdout]    |          ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `substr`
[INFO] [stdout]   --> src/main.rs:59:4
[INFO] [stdout]    |
[INFO] [stdout] 59 | fn substr(s: &str, start: usize, length: usize) -> String {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `system_monitor`
[INFO] [stdout]   --> src/main.rs:64:4
[INFO] [stdout]    |
[INFO] [stdout] 64 | fn system_monitor() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.00s
[INFO] running `Command { std: "docker" "inspect" "0a6ba3b2a5b3a83d3cdb8a1dfba5be47ebf4d21545ee29564ff956f6409b607f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a6ba3b2a5b3a83d3cdb8a1dfba5be47ebf4d21545ee29564ff956f6409b607f", kill_on_drop: false }`
[INFO] [stdout] 0a6ba3b2a5b3a83d3cdb8a1dfba5be47ebf4d21545ee29564ff956f6409b607f
[INFO] running `Command { std: "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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 977b2311f4ef834627df28e6118417b60f7f1933802898c0998cd05a41c4a70a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "977b2311f4ef834627df28e6118417b60f7f1933802898c0998cd05a41c4a70a", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.systemstat
[INFO] [stderr] warning: unused import: `ptr::null`
[INFO] [stderr]  --> src/main.rs:7:47
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::{fs::{self, OpenOptions}, io::Write, ptr::null, thread};
[INFO] [stderr]   |                                               ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `need_num`
[INFO] [stderr]   --> src/main.rs:27:10
[INFO] [stderr]    |
[INFO] [stderr] 27 |      let need_num = ["0","1","2","3","4","5","6","7","8","9"];
[INFO] [stderr]    |          ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_need_num`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ball`
[INFO] [stderr]   --> src/main.rs:23:10
[INFO] [stderr]    |
[INFO] [stderr] 23 | async fn ball(){
[INFO] [stderr]    |          ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `substr`
[INFO] [stderr]   --> src/main.rs:59:4
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn substr(s: &str, start: usize, length: usize) -> String {
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `system_monitor`
[INFO] [stderr]   --> src/main.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 | fn system_monitor() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.29s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_demo-cbeba69e12b3fb5b)
[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" "977b2311f4ef834627df28e6118417b60f7f1933802898c0998cd05a41c4a70a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "977b2311f4ef834627df28e6118417b60f7f1933802898c0998cd05a41c4a70a", kill_on_drop: false }`
[INFO] [stdout] 977b2311f4ef834627df28e6118417b60f7f1933802898c0998cd05a41c4a70a