[INFO] cloning repository https://github.com/wgr523/blockchain-simulator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wgr523/blockchain-simulator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwgr523%2Fblockchain-simulator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwgr523%2Fblockchain-simulator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4a29d440952e8252bd29793bf6c5e8461c0ed448
[INFO] checking wgr523/blockchain-simulator against master#4eb62535fc12dd1a63fd43a4173e224e79313c4d for pr-158816
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwgr523%2Fblockchain-simulator" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/wgr523/blockchain-simulator
[INFO] finished tweaking git repo https://github.com/wgr523/blockchain-simulator
[INFO] tweaked toml for git repo https://github.com/wgr523/blockchain-simulator written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/wgr523/blockchain-simulator on toolchain 4eb62535fc12dd1a63fd43a4173e224e79313c4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/wgr523/blockchain-simulator 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" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded horrorshow v0.8.3
[INFO] [stderr]   Downloaded tiny_http v0.8.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f
[INFO] running `Command { std: "docker" "start" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f" "/opt/rustwide/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f" "/opt/rustwide/cargo-home/bin/cargo" "+4eb62535fc12dd1a63fd43a4173e224e79313c4d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.94
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling cc v1.0.67
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking tinyvec v1.2.0
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking unicode-bidi v0.3.5
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking chunked_transfer v1.4.0
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking ascii v1.0.0
[INFO] [stderr]     Checking horrorshow v0.8.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking signal-hook-registry v1.3.0
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking signal-hook v0.1.17
[INFO] [stderr]     Checking crossterm v0.19.0
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]     Checking unicode-normalization v0.1.17
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking url v2.2.1
[INFO] [stderr]     Checking tiny_http v0.8.1
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking blockchain-simulator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[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 imports: `Result` and `cursor`
[INFO] [stdout]  --> src/miner.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossterm::{cursor, Result};
[INFO] [stdout]   |                 ^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ClearType`, `Clear`, `disable_raw_mode`, and `enable_raw_mode`
[INFO] [stdout]  --> src/miner.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crossterm::terminal::{enable_raw_mode, disable_raw_mode, Clear, ClearType};
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Color`, `Print`, `SetBackgroundColor`, and `SetForegroundColor`
[INFO] [stdout]  --> src/miner.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossterm::style::{Color, SetForegroundColor, SetBackgroundColor, Print};
[INFO] [stdout]   |                        ^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `channel`
[INFO] [stdout]  --> src/miner.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::sync::mpsc::{Sender, Receiver, channel};
[INFO] [stdout]   |                                         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]   --> src/miner.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::stdout;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cursor`
[INFO] [stdout]  --> src/network.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossterm::{cursor, Result};
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ClearType`, `Clear`, `disable_raw_mode`, and `enable_raw_mode`
[INFO] [stdout]  --> src/network.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crossterm::terminal::{enable_raw_mode, disable_raw_mode, Clear, ClearType};
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Color`, `Print`, `SetBackgroundColor`, and `SetForegroundColor`
[INFO] [stdout]  --> src/network.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossterm::style::{Color, SetForegroundColor, SetBackgroundColor, Print};
[INFO] [stdout]   |                        ^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `channel`
[INFO] [stdout]  --> src/network.rs:5:33
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::mpsc::{Receiver, channel, Sender};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_tree::BlockTree`
[INFO] [stdout]  --> src/network.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::block_tree::BlockTree;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]   --> src/network.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::stdout;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]   --> src/network.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::hash::Hash;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `horrorshow::prelude::*`
[INFO] [stdout]  --> src/server.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use horrorshow::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::network::Network`
[INFO] [stdout]   --> src/server.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::network::Network;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write` and `stdout`
[INFO] [stdout]   --> src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::io::{stdout, Write, BufReader};
[INFO] [stdout]    |               ^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]   --> src/main.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::time::{Duration, Instant};
[INFO] [stdout]    |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[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 imports: `Result` and `cursor`
[INFO] [stdout]  --> src/miner.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossterm::{cursor, Result};
[INFO] [stdout]   |                 ^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ClearType`, `Clear`, `disable_raw_mode`, and `enable_raw_mode`
[INFO] [stdout]  --> src/miner.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crossterm::terminal::{enable_raw_mode, disable_raw_mode, Clear, ClearType};
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Color`, `Print`, `SetBackgroundColor`, and `SetForegroundColor`
[INFO] [stdout]  --> src/miner.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossterm::style::{Color, SetForegroundColor, SetBackgroundColor, Print};
[INFO] [stdout]   |                        ^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `channel`
[INFO] [stdout]  --> src/miner.rs:7:41
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::sync::mpsc::{Sender, Receiver, channel};
[INFO] [stdout]   |                                         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]   --> src/miner.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::stdout;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cursor`
[INFO] [stdout]  --> src/network.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crossterm::{cursor, Result};
[INFO] [stdout]   |                 ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ClearType`, `Clear`, `disable_raw_mode`, and `enable_raw_mode`
[INFO] [stdout]  --> src/network.rs:2:27
[INFO] [stdout]   |
[INFO] [stdout] 2 | use crossterm::terminal::{enable_raw_mode, disable_raw_mode, Clear, ClearType};
[INFO] [stdout]   |                           ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Color`, `Print`, `SetBackgroundColor`, and `SetForegroundColor`
[INFO] [stdout]  --> src/network.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crossterm::style::{Color, SetForegroundColor, SetBackgroundColor, Print};
[INFO] [stdout]   |                        ^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `channel`
[INFO] [stdout]  --> src/network.rs:5:33
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::mpsc::{Receiver, channel, Sender};
[INFO] [stdout]   |                                 ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_tree::BlockTree`
[INFO] [stdout]  --> src/network.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use crate::block_tree::BlockTree;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]   --> src/network.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::io::stdout;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]   --> src/network.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::hash::Hash;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `horrorshow::prelude::*`
[INFO] [stdout]  --> src/server.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use horrorshow::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::network::Network`
[INFO] [stdout]   --> src/server.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use crate::network::Network;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write` and `stdout`
[INFO] [stdout]   --> src/main.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | use std::io::{stdout, Write, BufReader};
[INFO] [stdout]    |               ^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Duration` and `Instant`
[INFO] [stdout]   --> src/main.rs:21:17
[INFO] [stdout]    |
[INFO] [stdout] 21 | use std::time::{Duration, Instant};
[INFO] [stdout]    |                 ^^^^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let mut delay: HashMap<(u8,u8), u64> = {
[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: method `set_single_delay` is never used
[INFO] [stdout]   --> src/network.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Network {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 24 |
[INFO] [stdout] 25 |     pub fn set_single_delay(&mut self, from: u8, to: u8, delay: u64) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 62 |     let mut delay: HashMap<(u8,u8), u64> = {
[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: method `set_single_delay` is never used
[INFO] [stdout]   --> src/network.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | impl Network {
[INFO] [stdout]    | ------------ method in this implementation
[INFO] [stdout] 24 |
[INFO] [stdout] 25 |     pub fn set_single_delay(&mut self, from: u8, to: u8, delay: u64) {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 18.09s
[INFO] running `Command { std: "docker" "inspect" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f", kill_on_drop: false }`
[INFO] [stdout] 2a6c4e8726a851f61d0a253acf031c433aca493f84a9a96adb2be5cfed4c8a7f
