[INFO] cloning repository https://github.com/ttexan1/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ttexan1/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fttexan1%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fttexan1%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0c8affa4144bb8a76c16fcd2421e9d0a369d25a9
[INFO] testing ttexan1/rust-practice against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fttexan1%2Frust-practice" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ttexan1/rust-practice on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ttexan1/rust-practice
[INFO] finished tweaking git repo https://github.com/ttexan1/rust-practice
[INFO] tweaked toml for git repo https://github.com/ttexan1/rust-practice written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/ttexan1/rust-practice already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", 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] 00a9e6f2d6758cce2c0b91a123bb71291e4a36d9d99908b389eb8564315c7ab6
[INFO] running `Command { std: "docker" "start" "-a" "00a9e6f2d6758cce2c0b91a123bb71291e4a36d9d99908b389eb8564315c7ab6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "00a9e6f2d6758cce2c0b91a123bb71291e4a36d9d99908b389eb8564315c7ab6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "00a9e6f2d6758cce2c0b91a123bb71291e4a36d9d99908b389eb8564315c7ab6", kill_on_drop: false }`
[INFO] [stdout] 00a9e6f2d6758cce2c0b91a123bb71291e4a36d9d99908b389eb8564315c7ab6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--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] 1d3a19e748fc1c962888975b6d1c71b7462418170be2e12a6ce7609fce700e25
[INFO] running `Command { std: "docker" "start" "-a" "1d3a19e748fc1c962888975b6d1c71b7462418170be2e12a6ce7609fce700e25", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling smawk v0.3.1
[INFO] [stderr]    Compiling smallvec v0.4.5
[INFO] [stderr]    Compiling textwrap v0.13.4
[INFO] [stderr]    Compiling ferris-says v0.2.1
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `some_number`
[INFO] [stdout]   --> src/chapter6.rs:61:7
[INFO] [stdout]    |
[INFO] [stdout] 61 |   let some_number = Some(5);
[INFO] [stdout]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_string`
[INFO] [stdout]   --> src/chapter6.rs:62:7
[INFO] [stdout]    |
[INFO] [stdout] 62 |   let some_string = Some("a string");
[INFO] [stdout]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `absent_number`
[INFO] [stdout]   --> src/chapter6.rs:64:7
[INFO] [stdout]    |
[INFO] [stdout] 64 |   let absent_number: Option<i32> = None;
[INFO] [stdout]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/chapter6.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 10 |   V4(String),
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/chapter6.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   V6(String),
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/chapter6.rs:16:3
[INFO] [stdout]    |
[INFO] [stdout] 16 |   kind: IpAddrKind,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/chapter6.rs:17:3
[INFO] [stdout]    |
[INFO] [stdout] 17 |   address: String,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/chapter6.rs:21:3
[INFO] [stdout]    |
[INFO] [stdout] 21 |   Quit,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/chapter6.rs:22:3
[INFO] [stdout]    |
[INFO] [stdout] 22 |   Move { x: i32, y: i32 },
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/chapter6.rs:24:3
[INFO] [stdout]    |
[INFO] [stdout] 24 |   ChangeColor(i32, i32, i32),
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.30s
[INFO] running `Command { std: "docker" "inspect" "1d3a19e748fc1c962888975b6d1c71b7462418170be2e12a6ce7609fce700e25", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d3a19e748fc1c962888975b6d1c71b7462418170be2e12a6ce7609fce700e25", kill_on_drop: false }`
[INFO] [stdout] 1d3a19e748fc1c962888975b6d1c71b7462418170be2e12a6ce7609fce700e25
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff2f695f7c09c55b8ec90bd04b82486059abb79047fb14d31782000796df4abb
[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" "ff2f695f7c09c55b8ec90bd04b82486059abb79047fb14d31782000796df4abb", kill_on_drop: false }`
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `some_number`
[INFO] [stdout]   --> src/chapter6.rs:61:7
[INFO] [stdout]    |
[INFO] [stdout] 61 |   let some_number = Some(5);
[INFO] [stdout]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `some_string`
[INFO] [stdout]   --> src/chapter6.rs:62:7
[INFO] [stdout]    |
[INFO] [stdout] 62 |   let some_string = Some("a string");
[INFO] [stdout]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `absent_number`
[INFO] [stdout]   --> src/chapter6.rs:64:7
[INFO] [stdout]    |
[INFO] [stdout] 64 |   let absent_number: Option<i32> = None;
[INFO] [stdout]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]   --> src/chapter6.rs:10:3
[INFO] [stdout]    |
[INFO] [stdout] 10 |   V4(String),
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]   --> src/chapter6.rs:11:3
[INFO] [stdout]    |
[INFO] [stdout] 11 |   V6(String),
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/chapter6.rs:16:3
[INFO] [stdout]    |
[INFO] [stdout] 16 |   kind: IpAddrKind,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/chapter6.rs:17:3
[INFO] [stdout]    |
[INFO] [stdout] 17 |   address: String,
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   --> src/chapter6.rs:14:10
[INFO] [stdout]    |
[INFO] [stdout] 14 | #[derive(Debug)]
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/chapter6.rs:21:3
[INFO] [stdout]    |
[INFO] [stdout] 21 |   Quit,
[INFO] [stdout]    |   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]   --> src/chapter6.rs:22:3
[INFO] [stdout]    |
[INFO] [stdout] 22 |   Move { x: i32, y: i32 },
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/chapter6.rs:24:3
[INFO] [stdout]    |
[INFO] [stdout] 24 |   ChangeColor(i32, i32, i32),
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "ff2f695f7c09c55b8ec90bd04b82486059abb79047fb14d31782000796df4abb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff2f695f7c09c55b8ec90bd04b82486059abb79047fb14d31782000796df4abb", kill_on_drop: false }`
[INFO] [stdout] ff2f695f7c09c55b8ec90bd04b82486059abb79047fb14d31782000796df4abb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 04a541ba6419d78f3705e0c856e01b4623c56d1e10ff0e4951a5d9430f76cd82
[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" "04a541ba6419d78f3705e0c856e01b4623c56d1e10ff0e4951a5d9430f76cd82", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `some_number`
[INFO] [stdout] 
[INFO] [stderr]   --> src/chapter6.rs:61:7
[INFO] [stdout] running 0 tests
[INFO] [stderr]    |
[INFO] [stdout] 
[INFO] [stderr] 61 |   let some_number = Some(5);
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_number`
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `some_string`
[INFO] [stderr]   --> src/chapter6.rs:62:7
[INFO] [stderr]    |
[INFO] [stderr] 62 |   let some_string = Some("a string");
[INFO] [stderr]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_some_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `absent_number`
[INFO] [stderr]   --> src/chapter6.rs:64:7
[INFO] [stderr]    |
[INFO] [stderr] 64 |   let absent_number: Option<i32> = None;
[INFO] [stderr]    |       ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_absent_number`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V4`
[INFO] [stderr]   --> src/chapter6.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   V4(String),
[INFO] [stderr]    |   ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/chapter6.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `V6`
[INFO] [stderr]   --> src/chapter6.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   V6(String),
[INFO] [stderr]    |   ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `IpAddrKindStr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/chapter6.rs:8:10
[INFO] [stderr]    |
[INFO] [stderr] 8  | #[derive(Debug)] // String型に限定して何かできる
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]   --> src/chapter6.rs:16:3
[INFO] [stderr]    |
[INFO] [stderr] 16 |   kind: IpAddrKind,
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/chapter6.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]   --> src/chapter6.rs:17:3
[INFO] [stderr]    |
[INFO] [stderr] 17 |   address: String,
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr] note: `IpAddr` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]   --> src/chapter6.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 | #[derive(Debug)]
[INFO] [stderr]    |          ^^^^^
[INFO] [stderr]    = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Quit`
[INFO] [stderr]   --> src/chapter6.rs:21:3
[INFO] [stderr]    |
[INFO] [stderr] 21 |   Quit,
[INFO] [stderr]    |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/chapter6.rs:22:3
[INFO] [stderr]    |
[INFO] [stderr] 22 |   Move { x: i32, y: i32 },
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/chapter6.rs:24:3
[INFO] [stderr]    |
[INFO] [stderr] 24 |   ChangeColor(i32, i32, i32),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `hello-rust` (bin "hello-rust" test) generated 10 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/hello_rust-55408c0fcc9c09b5)
[INFO] running `Command { std: "docker" "inspect" "04a541ba6419d78f3705e0c856e01b4623c56d1e10ff0e4951a5d9430f76cd82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04a541ba6419d78f3705e0c856e01b4623c56d1e10ff0e4951a5d9430f76cd82", kill_on_drop: false }`
[INFO] [stdout] 04a541ba6419d78f3705e0c856e01b4623c56d1e10ff0e4951a5d9430f76cd82