[INFO] cloning repository https://github.com/maxdotdotg/rust_exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/maxdotdotg/rust_exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 415483b495fda562ccf51029830316b231861bfb
[INFO] testing maxdotdotg/rust_exercises against beta-2022-02-22 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmaxdotdotg%2Frust_exercises" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/maxdotdotg/rust_exercises on toolchain beta-2022-02-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/maxdotdotg/rust_exercises
[INFO] finished tweaking git repo https://github.com/maxdotdotg/rust_exercises
[INFO] tweaked toml for git repo https://github.com/maxdotdotg/rust_exercises written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/maxdotdotg/rust_exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-02-22" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f2e6de11770be5fd30da4d81abe218fd19b52202785a711f28cb86426287ebe0
[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" "f2e6de11770be5fd30da4d81abe218fd19b52202785a711f28cb86426287ebe0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f2e6de11770be5fd30da4d81abe218fd19b52202785a711f28cb86426287ebe0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f2e6de11770be5fd30da4d81abe218fd19b52202785a711f28cb86426287ebe0", kill_on_drop: false }`
[INFO] [stdout] f2e6de11770be5fd30da4d81abe218fd19b52202785a711f28cb86426287ebe0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b9a90b8bb209d2b6082805ce06c8ee81c064f1bfc7b8c46cf770af72d394e5b7
[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" "b9a90b8bb209d2b6082805ce06c8ee81c064f1bfc7b8c46cf770af72d394e5b7", kill_on_drop: false }`
[INFO] [stderr]    Compiling exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/bin/match.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count_2` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut count_2 = 0;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count_2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count_2` is never read
[INFO] [stdout]   --> src/bin/match.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         count_2 += 1;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/bin/match.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]  --> src/bin/match.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Dime,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/bin/option.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let six = plus_one(five);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/bin/option.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/bin/functions.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `user5`
[INFO] [stdout]   --> src/bin/struct.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let user5 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user5`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color_var`
[INFO] [stdout]   --> src/bin/struct.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let color_var = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_color_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `IpAddrKind_with_types` should have an upper camel case name
[INFO] [stdout]  --> src/bin/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddrKind_with_types {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `IpAddrKindWithTypes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_four`
[INFO] [stdout]   --> src/bin/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let v_four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_v_four`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_six`
[INFO] [stdout]   --> src/bin/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let v_six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/bin/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/bin/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loop_again`
[INFO] [stdout]   --> src/bin/enums.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let loop_again = IpAddrKind_with_types::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loop_again`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_kind`
[INFO] [stdout]   --> src/bin/enums.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/bin/enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/bin/enums.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     address: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `route`
[INFO] [stdout]   --> src/bin/enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.50s
[INFO] running `Command { std: "docker" "inspect" "b9a90b8bb209d2b6082805ce06c8ee81c064f1bfc7b8c46cf770af72d394e5b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9a90b8bb209d2b6082805ce06c8ee81c064f1bfc7b8c46cf770af72d394e5b7", kill_on_drop: false }`
[INFO] [stdout] b9a90b8bb209d2b6082805ce06c8ee81c064f1bfc7b8c46cf770af72d394e5b7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 10c77f234db20ef2b2b46c8f6db35826dad99c0dddd0ca7bd89d5357519c3c7b
[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" "10c77f234db20ef2b2b46c8f6db35826dad99c0dddd0ca7bd89d5357519c3c7b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `user5`
[INFO] [stdout]   --> src/bin/struct.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     let user5 = User {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user5`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `color_var`
[INFO] [stdout]   --> src/bin/struct.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let color_var = Color(0, 0, 0);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_color_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:56:13
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let mut count = 0;
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]    = note: consider using `_count` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count` is never read
[INFO] [stdout]   --> src/bin/match.rs:60:14
[INFO] [stdout]    |
[INFO] [stdout] 60 |         _ => count += 1,
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `count_2` is assigned to, but never used
[INFO] [stdout]   --> src/bin/match.rs:69:13
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let mut count_2 = 0;
[INFO] [stdout]    |             ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_count_2` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `count_2` is never read
[INFO] [stdout]   --> src/bin/match.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         count_2 += 1;
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Nickel`
[INFO] [stdout]  --> src/bin/match.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Nickel,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `IpAddrKind_with_types` should have an upper camel case name
[INFO] [stdout]  --> src/bin/enums.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum IpAddrKind_with_types {
[INFO] [stdout]   |      ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `IpAddrKindWithTypes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Dime`
[INFO] [stdout]  --> src/bin/match.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Dime,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `six`
[INFO] [stdout]   --> src/bin/option.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let six = plus_one(five);
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/bin/functions.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let x = 5;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]   --> src/bin/option.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let none = plus_one(None);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_four`
[INFO] [stdout]   --> src/bin/enums.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let v_four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_v_four`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v_six`
[INFO] [stdout]   --> src/bin/enums.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let v_six = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v_six`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/bin/enums.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |     let home = IpAddr {
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/bin/enums.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let loopback = IpAddr {
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loop_again`
[INFO] [stdout]   --> src/bin/enums.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let loop_again = IpAddrKind_with_types::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loop_again`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_kind`
[INFO] [stdout]   --> src/bin/enums.rs:42:10
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `kind`
[INFO] [stdout]   --> src/bin/enums.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 16 |     kind: IpAddrKind,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `address`
[INFO] [stdout]   --> src/bin/enums.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     address: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `route`
[INFO] [stdout]   --> src/bin/enums.rs:42:4
[INFO] [stdout]    |
[INFO] [stdout] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 3.93s
[INFO] running `Command { std: "docker" "inspect" "10c77f234db20ef2b2b46c8f6db35826dad99c0dddd0ca7bd89d5357519c3c7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10c77f234db20ef2b2b46c8f6db35826dad99c0dddd0ca7bd89d5357519c3c7b", kill_on_drop: false }`
[INFO] [stdout] 10c77f234db20ef2b2b46c8f6db35826dad99c0dddd0ca7bd89d5357519c3c7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-02-22" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4f52f3984fa6b2d7a6206e0f8bf3121c579cccbc5539f7998f6f0bfca11a8154
[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" "4f52f3984fa6b2d7a6206e0f8bf3121c579cccbc5539f7998f6f0bfca11a8154", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `user5`
[INFO] [stderr]   --> src/bin/struct.rs:48:9
[INFO] [stderr]    |
[INFO] [stderr] 48 |     let user5 = User {
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_user5`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `color_var`
[INFO] [stderr]   --> src/bin/struct.rs:63:9
[INFO] [stderr]    |
[INFO] [stderr] 63 |     let color_var = Color(0, 0, 0);
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_color_var`
[INFO] [stderr] 
[INFO] [stderr] warning: `exercises` (bin "struct" test) generated 2 warnings
[INFO] [stderr] warning: unused variable: `six`
[INFO] [stderr]   --> src/bin/option.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let six = plus_one(five);
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_six`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/bin/option.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let none = plus_one(None);
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stderr] 
[INFO] [stderr] warning: type `IpAddrKind_with_types` should have an upper camel case name
[INFO] [stderr]  --> src/bin/enums.rs:9:6
[INFO] [stderr]   |
[INFO] [stderr] 9 | enum IpAddrKind_with_types {
[INFO] [stderr]   |      ^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to upper camel case: `IpAddrKindWithTypes`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v_four`
[INFO] [stderr]   --> src/bin/enums.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let v_four = IpAddrKind::V4;
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_v_four`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v_six`
[INFO] [stderr]   --> src/bin/enums.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let v_six = IpAddrKind::V6;
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_v_six`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/bin/enums.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let home = IpAddr {
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/bin/enums.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let loopback = IpAddr {
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loop_again`
[INFO] [stderr]   --> src/bin/enums.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let loop_again = IpAddrKind_with_types::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loop_again`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ip_kind`
[INFO] [stderr]   --> src/bin/enums.rs:42:10
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stderr]    |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `kind`
[INFO] [stderr]   --> src/bin/enums.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     kind: IpAddrKind,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `address`
[INFO] [stderr]   --> src/bin/enums.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     address: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `route`
[INFO] [stderr]   --> src/bin/enums.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn route(ip_kind: IpAddrKind) { }
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/bin/functions.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 25 |     let x = 5;
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count` is assigned to, but never used
[INFO] [stderr]   --> src/bin/match.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut count = 0;
[INFO] [stderr]    |             ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr]    = note: consider using `_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count` is never read
[INFO] [stderr]   --> src/bin/match.rs:60:14
[INFO] [stderr]    |
[INFO] [stderr] 60 |         _ => count += 1,
[INFO] [stderr]    |              ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable `count_2` is assigned to, but never used
[INFO] [stderr]   --> src/bin/match.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let mut count_2 = 0;
[INFO] [stderr]    |             ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_count_2` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `count_2` is never read
[INFO] [stderr]   --> src/bin/match.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |         count_2 += 1;
[INFO] [stderr]    |         ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]  --> src/bin/match.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 |     Nickel,
[INFO] [stderr]   |     ^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]  --> src/bin/match.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     Dime,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `exercises` (bin "option" test) generated 2 warnings
[INFO] [stderr] warning: `exercises` (bin "enums" test) generated 10 warnings
[INFO] [stderr] warning: `exercises` (bin "functions" test) generated 1 warning
[INFO] [stderr] warning: `exercises` (bin "match" test) generated 6 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/control_flow-b4fd88cd0cbd8f0c)
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/enums-2652ceb1cb262c97)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/functions-8fe58741d448fe09)
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/match-32253cf63bc1deac)
[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] [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] [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] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/option-450cfe5d6e76f677)
[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] [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] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/references-2c9edad7c2dc21aa)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/slice-590e45df886f899f)
[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] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/struct-621e808c803a10a3)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/variables-495f1fe2e2fa2209)
[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] [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] [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" "4f52f3984fa6b2d7a6206e0f8bf3121c579cccbc5539f7998f6f0bfca11a8154", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f52f3984fa6b2d7a6206e0f8bf3121c579cccbc5539f7998f6f0bfca11a8154", kill_on_drop: false }`
[INFO] [stdout] 4f52f3984fa6b2d7a6206e0f8bf3121c579cccbc5539f7998f6f0bfca11a8154