[INFO] cloning repository https://github.com/Mik-Grzeg/rooster
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Mik-Grzeg/rooster" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMik-Grzeg%2Frooster", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMik-Grzeg%2Frooster'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 41084e035531a7fe7ba2e9dcc38fca10eb308ace
[INFO] checking Mik-Grzeg/rooster against eca445e5ae4a6679cc27d3a09106ce245e13a5a6 for pr-162478
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMik-Grzeg%2Frooster" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Mik-Grzeg/rooster
[INFO] finished tweaking git repo https://github.com/Mik-Grzeg/rooster
[INFO] tweaked toml for git repo https://github.com/Mik-Grzeg/rooster written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Mik-Grzeg/rooster on toolchain eca445e5ae4a6679cc27d3a09106ce245e13a5a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Mik-Grzeg/rooster 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" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc v0.2.107
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b
[INFO] running `Command { std: "docker" "start" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b", 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" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b" "/opt/rustwide/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b", 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" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b" "/opt/rustwide/cargo-home/bin/cargo" "+eca445e5ae4a6679cc27d3a09106ce245e13a5a6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.107
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking nix v0.23.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking rooster v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Arg`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{App, Arg, SubCommand};
[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: `CloneFlags`, `clone`, and `setns`
[INFO] [stdout]  --> src/main.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::sched::{clone, CloneFlags, setns};
[INFO] [stdout]   |                  ^^^^^  ^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::sys::signal::Signal`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use nix::sys::signal::Signal;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `WaitStatus` and `waitpid`
[INFO] [stdout]  --> src/main.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use nix::sys::wait::{waitpid, WaitStatus};
[INFO] [stdout]   |                      ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::unistd::sethostname`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::unistd::sethostname;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Command` and `ExitStatus`
[INFO] [stdout]  --> src/main.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, ExitStatus};
[INFO] [stdout]   |                    ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `App`, `Arg`, and `SubCommand`
[INFO] [stdout]  --> src/core/runner.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{App, Arg, SubCommand};
[INFO] [stdout]   |            ^^^  ^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `setns`
[INFO] [stdout]  --> src/core/runner.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::sched::{setns, clone, CloneFlags};
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::unistd::sethostname`
[INFO] [stdout]  --> src/core/runner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::unistd::sethostname;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Command` and `ExitStatus`
[INFO] [stdout]  --> src/core/runner.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, ExitStatus};
[INFO] [stdout]   |                    ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chroot`
[INFO] [stdout]  --> src/core/child.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::unistd::{chroot, sethostname, getpid};
[INFO] [stdout]   |                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::mount`
[INFO] [stdout]  --> src/core/child.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use nix::mount;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/core/child.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::Error`
[INFO] [stdout]  --> src/core/filesystem.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::Error;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Arg`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{App, Arg, SubCommand};
[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: `CloneFlags`, `clone`, and `setns`
[INFO] [stdout]  --> src/main.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::sched::{clone, CloneFlags, setns};
[INFO] [stdout]   |                  ^^^^^  ^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::sys::signal::Signal`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use nix::sys::signal::Signal;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `WaitStatus` and `waitpid`
[INFO] [stdout]  --> src/main.rs:4:22
[INFO] [stdout]   |
[INFO] [stdout] 4 | use nix::sys::wait::{waitpid, WaitStatus};
[INFO] [stdout]   |                      ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::unistd::sethostname`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::unistd::sethostname;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Command` and `ExitStatus`
[INFO] [stdout]  --> src/main.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, ExitStatus};
[INFO] [stdout]   |                    ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `App`, `Arg`, and `SubCommand`
[INFO] [stdout]  --> src/core/runner.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use clap::{App, Arg, SubCommand};
[INFO] [stdout]   |            ^^^  ^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `setns`
[INFO] [stdout]  --> src/core/runner.rs:2:18
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::sched::{setns, clone, CloneFlags};
[INFO] [stdout]   |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::unistd::sethostname`
[INFO] [stdout]  --> src/core/runner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::unistd::sethostname;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Command` and `ExitStatus`
[INFO] [stdout]  --> src/core/runner.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::process::{Command, ExitStatus};
[INFO] [stdout]   |                    ^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `chroot`
[INFO] [stdout]  --> src/core/child.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use nix::unistd::{chroot, sethostname, getpid};
[INFO] [stdout]   |                   ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::mount`
[INFO] [stdout]  --> src/core/child.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use nix::mount;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/core/child.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `nix::Error`
[INFO] [stdout]  --> src/core/filesystem.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use nix::Error;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/main.rs:18:22
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {core::runner::run();},
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/main.rs:19:24
[INFO] [stdout]    |
[INFO] [stdout] 19 |         ("child", Some(m)) => println!("Client"),
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]  --> src/core/ipc.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | type Result<T> = std::result::Result<T, 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: struct `IpcParent` is never constructed
[INFO] [stdout]  --> src/core/ipc.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct IpcParent {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `wait`, and `close` are never used
[INFO] [stdout]   --> src/core/ipc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl IpcParent {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(path: &String) -> Result<IpcParent> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn wait(&self) -> Result<String> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub fn close(&self) -> Result<()> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpcChild` is never constructed
[INFO] [stdout]   --> src/core/ipc.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub struct IpcChild {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `notify`, and `close` are never used
[INFO] [stdout]   --> src/core/ipc.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 53 | impl IpcChild {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 54 |     pub fn new(path: &String) -> Result<IpcChild> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn notify(&self, msg: &String) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 75 |     pub fn close(&self) -> Result<()> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/main.rs:18:22
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {core::runner::run();},
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `m`
[INFO] [stdout]   --> src/main.rs:19:24
[INFO] [stdout]    |
[INFO] [stdout] 19 |         ("child", Some(m)) => println!("Client"),
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_m`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `Result` is never used
[INFO] [stdout]  --> src/core/ipc.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | type Result<T> = std::result::Result<T, 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: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {core::runner::run();},
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {let _ = core::runner::run();},
[INFO] [stdout]    |                              +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpcParent` is never constructed
[INFO] [stdout]  --> src/core/ipc.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub struct IpcParent {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     sethostname("CONTAINER");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = sethostname("CONTAINER");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `wait`, and `close` are never used
[INFO] [stdout]   --> src/core/ipc.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl IpcParent {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 14 |     pub fn new(path: &String) -> Result<IpcParent> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 |     pub fn wait(&self) -> Result<String> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 41 |     pub fn close(&self) -> Result<()> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     filesystem::mount_rootfs(DIR);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = filesystem::mount_rootfs(DIR);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IpcChild` is never constructed
[INFO] [stdout]   --> src/core/ipc.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub struct IpcChild {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     filesystem::set_root_fs(DIR);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let _ = filesystem::set_root_fs(DIR);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | /     mount::mount(
[INFO] [stdout] 20 | |         None::<&str>,
[INFO] [stdout] 21 | |         "/",
[INFO] [stdout] 22 | |         None::<&str>,
[INFO] [stdout] 23 | |         mount::MsFlags::MS_PRIVATE | mount::MsFlags::MS_REC,
[INFO] [stdout] 24 | |         None::<&str>,
[INFO] [stdout] 25 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let _ = mount::mount(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `notify`, and `close` are never used
[INFO] [stdout]   --> src/core/ipc.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 53 | impl IpcChild {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 54 |     pub fn new(path: &String) -> Result<IpcChild> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 70 |     pub fn notify(&self, msg: &String) -> Result<()> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 75 |     pub fn close(&self) -> Result<()> {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | /     mount::mount(
[INFO] [stdout] 28 | |         Some(rootfs),
[INFO] [stdout] 29 | |         rootfs,
[INFO] [stdout] 30 | |         None::<&str>,
[INFO] [stdout] 31 | |         mount::MsFlags::MS_BIND | mount::MsFlags::MS_REC,
[INFO] [stdout] 32 | |         None::<&str>,
[INFO] [stdout] 33 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = mount::mount(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | /     unistd::mkdir(
[INFO] [stdout] 51 | |        &p_old_root_fs,
[INFO] [stdout] 52 | |        stat::Mode::S_IRWXU | stat::Mode::S_IRWXG | stat::Mode::S_IRWXO
[INFO] [stdout] 53 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let _ = unistd::mkdir(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     mount::umount2(OLD_ROOT_PATH, mount::MntFlags::MNT_DETACH);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = mount::umount2(OLD_ROOT_PATH, mount::MntFlags::MNT_DETACH);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fs::remove_dir_all(&p_old_root_fs);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let _ = fs::remove_dir_all(&p_old_root_fs);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 57 |     unistd::chdir(ROOT_PATH);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let _ = unistd::chdir(ROOT_PATH);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/main.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {core::runner::run();},
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |         ("run", Some(m)) => {let _ = core::runner::run();},
[INFO] [stdout]    |                              +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     sethostname("CONTAINER");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let _ = sethostname("CONTAINER");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     filesystem::mount_rootfs(DIR);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = filesystem::mount_rootfs(DIR);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/child.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     filesystem::set_root_fs(DIR);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let _ = filesystem::set_root_fs(DIR);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 | /     mount::mount(
[INFO] [stdout] 20 | |         None::<&str>,
[INFO] [stdout] 21 | |         "/",
[INFO] [stdout] 22 | |         None::<&str>,
[INFO] [stdout] 23 | |         mount::MsFlags::MS_PRIVATE | mount::MsFlags::MS_REC,
[INFO] [stdout] 24 | |         None::<&str>,
[INFO] [stdout] 25 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let _ = mount::mount(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | /     mount::mount(
[INFO] [stdout] 28 | |         Some(rootfs),
[INFO] [stdout] 29 | |         rootfs,
[INFO] [stdout] 30 | |         None::<&str>,
[INFO] [stdout] 31 | |         mount::MsFlags::MS_BIND | mount::MsFlags::MS_REC,
[INFO] [stdout] 32 | |         None::<&str>,
[INFO] [stdout] 33 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = mount::mount(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:50:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | /     unistd::mkdir(
[INFO] [stdout] 51 | |        &p_old_root_fs,
[INFO] [stdout] 52 | |        stat::Mode::S_IRWXU | stat::Mode::S_IRWXG | stat::Mode::S_IRWXO
[INFO] [stdout] 53 | |     );
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 50 |     let _ = unistd::mkdir(
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 55 |     mount::umount2(OLD_ROOT_PATH, mount::MntFlags::MNT_DETACH);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 55 |     let _ = mount::umount2(OLD_ROOT_PATH, mount::MntFlags::MNT_DETACH);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 56 |     fs::remove_dir_all(&p_old_root_fs);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let _ = fs::remove_dir_all(&p_old_root_fs);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/core/filesystem.rs:57:5
[INFO] [stdout]    |
[INFO] [stdout] 57 |     unistd::chdir(ROOT_PATH);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let _ = unistd::chdir(ROOT_PATH);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.62s
[INFO] running `Command { std: "docker" "inspect" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b", kill_on_drop: false }`
[INFO] [stdout] 642689410dc9f2b3958da99d3503aa6b419154fbc13214da956d6e956e2b0c3b
