[INFO] cloning repository https://github.com/Medsko/study-crate
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Medsko/study-crate" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMedsko%2Fstudy-crate", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMedsko%2Fstudy-crate'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d6a8f4909cfe47cbe56498954672b2bd7157acd
[INFO] testing Medsko/study-crate against try#ce59db7a1b1b012fb2793c4641c1bdecad7a128b for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMedsko%2Fstudy-crate" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Medsko/study-crate on toolchain ce59db7a1b1b012fb2793c4641c1bdecad7a128b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Medsko/study-crate
[INFO] finished tweaking git repo https://github.com/Medsko/study-crate
[INFO] tweaked toml for git repo https://github.com/Medsko/study-crate written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Medsko/study-crate already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e25f06622516c00abbacc9f6ff6043dab68d6f7ca237d5b15f04bb679d236097
[INFO] running `Command { std: "docker" "start" "-a" "e25f06622516c00abbacc9f6ff6043dab68d6f7ca237d5b15f04bb679d236097", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e25f06622516c00abbacc9f6ff6043dab68d6f7ca237d5b15f04bb679d236097", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e25f06622516c00abbacc9f6ff6043dab68d6f7ca237d5b15f04bb679d236097", kill_on_drop: false }`
[INFO] [stdout] e25f06622516c00abbacc9f6ff6043dab68d6f7ca237d5b15f04bb679d236097
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50188e2b35b2937af8869c58765b13bfb2ee910eac224b37786d5ff744adf62b
[INFO] running `Command { std: "docker" "start" "-a" "50188e2b35b2937af8869c58765b13bfb2ee910eac224b37786d5ff744adf62b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling study-crate v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `second_user`
[INFO] [stdout]   --> src/prepackages/structs.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let second_user = User {
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_second_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/prepackages/structs.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let black = Color(0,0,0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]   --> src/prepackages/structs.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let origin = Point(0,0,0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hip`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let hip = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hip`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     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: `concise_loopback`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let concise_loopback = ConciseIpAddr::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_concise_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let home = ConciseIpAddr::V4(127, 0, 0, 1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `yet_another_string`
[INFO] [stdout]   --> src/prepackages/ownership.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let yet_another_string = "Hi".to_string();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_yet_another_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `immutable_pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let immutable_pointer = &yet_another_string;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_immutable_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `another_immutable_pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let another_immutable_pointer = &yet_another_string;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_immutable_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let pointer = &mut yet_another_string;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_first_four_chars`
[INFO] [stdout]    --> src/prepackages/ownership.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let splice_first_four_chars = &s[0..4];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_first_four_chars_also`
[INFO] [stdout]    --> src/prepackages/ownership.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |     let splice_first_four_chars_also = &s[..4];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars_also`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_chars_from_fourth`
[INFO] [stdout]    --> src/prepackages/ownership.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |     let splice_chars_from_fourth = &s[4..];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_chars_from_fourth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello_file`
[INFO] [stdout]  --> src/exceptions.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let hello_file = match File::open("hello.txt") {
[INFO] [stdout]   |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hello_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/exceptions.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Err(error) => panic!("Could not read the current directory!")
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/collections/vectors.rs:35:39
[INFO] [stdout]    |
[INFO] [stdout] 35 |     match counts.iter().max_by_key(|&(key, value)| value) {
[INFO] [stdout]    |                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collections/strings.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut suffix: String;
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/collections/exercises.rs:75:28
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => panic!(msg)
[INFO] [stdout]    |                            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => panic!("{}", msg)
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/collections/exercises.rs:111:28
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => panic!(msg)
[INFO] [stdout]     |                            ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => panic!("{}", msg)
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.20s
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "50188e2b35b2937af8869c58765b13bfb2ee910eac224b37786d5ff744adf62b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50188e2b35b2937af8869c58765b13bfb2ee910eac224b37786d5ff744adf62b", kill_on_drop: false }`
[INFO] [stdout] 50188e2b35b2937af8869c58765b13bfb2ee910eac224b37786d5ff744adf62b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0edbb3d658d8068eb800b402efc12b578cb710e447a6c6a23a230619b68e604
[INFO] running `Command { std: "docker" "start" "-a" "b0edbb3d658d8068eb800b402efc12b578cb710e447a6c6a23a230619b68e604", kill_on_drop: false }`
[INFO] [stderr]    Compiling study-crate v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `second_user`
[INFO] [stdout]   --> src/prepackages/structs.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let second_user = User {
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_second_user`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `black`
[INFO] [stdout]   --> src/prepackages/structs.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let black = Color(0,0,0);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `origin`
[INFO] [stdout]   --> src/prepackages/structs.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let origin = Point(0,0,0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `four`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let four = IpAddrKind::V4;
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hip`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 |     let hip = IpAddrKind::V6;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hip`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `loopback`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:47:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     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: `concise_loopback`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let concise_loopback = ConciseIpAddr::V6(String::from("::1"));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_concise_loopback`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `home`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |     let home = ConciseIpAddr::V4(127, 0, 0, 1);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `yet_another_string`
[INFO] [stdout]   --> src/prepackages/ownership.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let yet_another_string = "Hi".to_string();
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_yet_another_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `immutable_pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let immutable_pointer = &yet_another_string;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_immutable_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `another_immutable_pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let another_immutable_pointer = &yet_another_string;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_immutable_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pointer`
[INFO] [stdout]   --> src/prepackages/ownership.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let pointer = &mut yet_another_string;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pointer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_first_four_chars`
[INFO] [stdout]    --> src/prepackages/ownership.rs:111:9
[INFO] [stdout]     |
[INFO] [stdout] 111 |     let splice_first_four_chars = &s[0..4];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_first_four_chars_also`
[INFO] [stdout]    --> src/prepackages/ownership.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |     let splice_first_four_chars_also = &s[..4];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars_also`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `splice_chars_from_fourth`
[INFO] [stdout]    --> src/prepackages/ownership.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |     let splice_chars_from_fourth = &s[4..];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_chars_from_fourth`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello_file`
[INFO] [stdout]  --> src/exceptions.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let hello_file = match File::open("hello.txt") {
[INFO] [stdout]   |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hello_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/exceptions.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 |         Err(error) => panic!("Could not read the current directory!")
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]   --> src/collections/vectors.rs:35:39
[INFO] [stdout]    |
[INFO] [stdout] 35 |     match counts.iter().max_by_key(|&(key, value)| value) {
[INFO] [stdout]    |                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/collections/strings.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut suffix: String;
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/collections/exercises.rs:75:28
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => panic!(msg)
[INFO] [stdout]    |                            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => panic!("{}", msg)
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 75 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> src/collections/exercises.rs:111:28
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => panic!(msg)
[INFO] [stdout]     |                            ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => panic!("{}", msg)
[INFO] [stdout]     |                            ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]     |
[INFO] [stdout] 111 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `Command { std: "docker" "inspect" "b0edbb3d658d8068eb800b402efc12b578cb710e447a6c6a23a230619b68e604", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0edbb3d658d8068eb800b402efc12b578cb710e447a6c6a23a230619b68e604", kill_on_drop: false }`
[INFO] [stdout] b0edbb3d658d8068eb800b402efc12b578cb710e447a6c6a23a230619b68e604
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ce59db7a1b1b012fb2793c4641c1bdecad7a128b" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d3d65a26bf122507b330b991aa938e51b3174f2d5cddfa7ca1bb0878460a30e2
[INFO] running `Command { std: "docker" "start" "-a" "d3d65a26bf122507b330b991aa938e51b3174f2d5cddfa7ca1bb0878460a30e2", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `second_user`
[INFO] [stdout] running 7 tests
[INFO] [stderr]   --> src/prepackages/structs.rs:31:9
[INFO] [stdout] test collections::strings::tests::to_pig_latin_identifies_vowel ... ok
[INFO] [stderr]    |
[INFO] [stdout] test collections::strings::tests::to_pig_latin_identifies_pseudo_vowel ... ok
[INFO] [stderr] 31 |     let second_user = User {
[INFO] [stdout] test collections::strings::tests::to_pig_latin_identifies_consonant ... ok
[INFO] [stderr]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_second_user`
[INFO] [stdout] test prepackages::ownership::tests::slice_first_word_returns_entire_word ... ok
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `black`
[INFO] [stderr]   --> src/prepackages/structs.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let black = Color(0,0,0);
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_black`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `origin`
[INFO] [stderr]   --> src/prepackages/structs.rs:38:9
[INFO] [stderr]    |
[INFO] [stderr] 38 |     let origin = Point(0,0,0);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_origin`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `four`
[INFO] [stderr]   --> src/prepackages/enums/enums.rs:44:9
[INFO] [stderr]    |
[INFO] [stderr] 44 |     let four = IpAddrKind::V4;
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_four`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hip`
[INFO] [stderr]   --> src/prepackages/enums/enums.rs:45:9
[INFO] [stderr]    |
[INFO] [stderr] 45 |     let hip = IpAddrKind::V6;
[INFO] [stderr]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_hip`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `loopback`
[INFO] [stderr]   --> src/prepackages/enums/enums.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |     let loopback = IpAddr {
[INFO] [stderr]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `concise_loopback`
[INFO] [stderr]   --> src/prepackages/enums/enums.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let concise_loopback = ConciseIpAddr::V6(String::from("::1"));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_concise_loopback`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `home`
[INFO] [stderr]   --> src/prepackages/enums/enums.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let home = ConciseIpAddr::V4(127, 0, 0, 1);
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_home`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `yet_another_string`
[INFO] [stderr]   --> src/prepackages/ownership.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let yet_another_string = "Hi".to_string();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_yet_another_string`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `immutable_pointer`
[INFO] [stderr]   --> src/prepackages/ownership.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let immutable_pointer = &yet_another_string;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_immutable_pointer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `another_immutable_pointer`
[INFO] [stderr]   --> src/prepackages/ownership.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let another_immutable_pointer = &yet_another_string;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_another_immutable_pointer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pointer`
[INFO] [stderr]   --> src/prepackages/ownership.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let pointer = &mut yet_another_string;
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_pointer`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `splice_first_four_chars`
[INFO] [stderr]    --> src/prepackages/ownership.rs:111:9
[INFO] [stderr]     |
[INFO] [stderr] 111 |     let splice_first_four_chars = &s[0..4];
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `splice_first_four_chars_also`
[INFO] [stderr]    --> src/prepackages/ownership.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 |     let splice_first_four_chars_also = &s[..4];
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_first_four_chars_also`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `splice_chars_from_fourth`
[INFO] [stderr]    --> src/prepackages/ownership.rs:114:9
[INFO] [stderr]     |
[INFO] [stderr] 114 |     let splice_chars_from_fourth = &s[4..];
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_splice_chars_from_fourth`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hello_file`
[INFO] [stderr]  --> src/exceptions.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let hello_file = match File::open("hello.txt") {
[INFO] [stderr]   |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hello_file`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/exceptions.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         Err(error) => panic!("Could not read the current directory!")
[INFO] [stderr]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `key`
[INFO] [stderr]   --> src/collections/vectors.rs:35:39
[INFO] [stderr]    |
[INFO] [stderr] 35 |     match counts.iter().max_by_key(|&(key, value)| value) {
[INFO] [stderr]    |                                       ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/collections/strings.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let mut suffix: String;
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]   --> src/collections/exercises.rs:75:28
[INFO] [stderr]    |
[INFO] [stderr] 75 |         Err(msg) => panic!(msg)
[INFO] [stderr]    |                            ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stderr]    = note: this is no longer accepted in Rust 2021
[INFO] [stderr] help: add a "{}" format string to Display the message
[INFO] [stderr]    |
[INFO] [stderr] 75 |         Err(msg) => panic!("{}", msg)
[INFO] [stderr]    |                            ^^^^^
[INFO] [stderr] help: or use std::panic::panic_any instead
[INFO] [stderr]    |
[INFO] [stderr] 75 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: panic message is not a string literal
[INFO] [stderr]    --> src/collections/exercises.rs:111:28
[INFO] [stderr]     |
[INFO] [stderr] 111 |         Err(msg) => panic!(msg)
[INFO] [stderr]     |                            ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this is no longer accepted in Rust 2021
[INFO] [stderr] help: add a "{}" format string to Display the message
[INFO] [stderr]     |
[INFO] [stderr] 111 |         Err(msg) => panic!("{}", msg)
[INFO] [stderr]     |                            ^^^^^
[INFO] [stderr] help: or use std::panic::panic_any instead
[INFO] [stderr]     |
[INFO] [stderr] 111 |         Err(msg) => std::panic::panic_any(msg)
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 21 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/study_crate-305da09951d2d641)
[INFO] [stdout] test prepackages::ownership::tests::slice_first_word_returns_first ... ok
[INFO] [stdout] test prepackages::gg::tests::panics_on_greater_than_100 ... ok
[INFO] [stdout] test prepackages::gg::tests::panics_on_smaller_than_1 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d3d65a26bf122507b330b991aa938e51b3174f2d5cddfa7ca1bb0878460a30e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3d65a26bf122507b330b991aa938e51b3174f2d5cddfa7ca1bb0878460a30e2", kill_on_drop: false }`
[INFO] [stdout] d3d65a26bf122507b330b991aa938e51b3174f2d5cddfa7ca1bb0878460a30e2