[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] 2f21157493b3574c7d1d682316c7df5ba4a16c80
[INFO] checking Medsko/study-crate against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMedsko%2Fstudy-crate" "/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/Medsko/study-crate on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "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-8/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" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e20268684ec266af36d074bb1483b5ca2b04fe432b13a307da0d8ae19160dbb6
[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" "e20268684ec266af36d074bb1483b5ca2b04fe432b13a307da0d8ae19160dbb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e20268684ec266af36d074bb1483b5ca2b04fe432b13a307da0d8ae19160dbb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e20268684ec266af36d074bb1483b5ca2b04fe432b13a307da0d8ae19160dbb6", kill_on_drop: false }`
[INFO] [stdout] e20268684ec266af36d074bb1483b5ca2b04fe432b13a307da0d8ae19160dbb6
[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=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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8854d2071c2351c7f2d6cc74a23c86aec5f60dc2fdd678897b1d7fe61dd69a88
[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" "8854d2071c2351c7f2d6cc74a23c86aec5f60dc2fdd678897b1d7fe61dd69a88", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking 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: struct is never constructed: `User`
[INFO] [stdout]  --> src/prepackages/structs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Color`
[INFO] [stdout]  --> src/prepackages/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Color(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/prepackages/structs.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_structs`
[INFO] [stdout]   --> src/prepackages/structs.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn first_structs() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/prepackages/structs.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn build_user(email: String, username1: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_square`
[INFO] [stdout]   --> src/prepackages/structs.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 |     fn is_square(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `transform_to_circle`
[INFO] [stdout]   --> src/prepackages/structs.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn transform_to_circle(self) -> Circle {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/prepackages/structs.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `stretch`
[INFO] [stdout]   --> src/prepackages/structs.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn stretch(&mut self, add_height: u32, add_width: u32) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | Quit,                       // - geen velden (Unit struct)
[INFO] [stdout]    | ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | ChangeColor(i32, i32, i32), // - (idem)
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Alabama,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Alaska,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Oregon`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Oregon,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Coin {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value_in_cents`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn value_in_cents(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `slice_first_word`
[INFO] [stdout]    --> src/prepackages/ownership.rs:121:4
[INFO] [stdout]     |
[INFO] [stdout] 121 | fn slice_first_word(s: &String) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/prepackages/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[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: struct is never constructed: `User`
[INFO] [stdout]  --> src/prepackages/structs.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct User {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Color`
[INFO] [stdout]  --> src/prepackages/structs.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | struct Color(i32, i32, i32);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/prepackages/structs.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct Point(i32, i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_structs`
[INFO] [stdout]   --> src/prepackages/structs.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn first_structs() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `build_user`
[INFO] [stdout]   --> src/prepackages/structs.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn build_user(email: String, username1: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_square`
[INFO] [stdout]   --> src/prepackages/structs.rs:74:8
[INFO] [stdout]    |
[INFO] [stdout] 74 |     fn is_square(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `transform_to_circle`
[INFO] [stdout]   --> src/prepackages/structs.rs:79:8
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn transform_to_circle(self) -> Circle {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `can_hold`
[INFO] [stdout]   --> src/prepackages/structs.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 |     fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `stretch`
[INFO] [stdout]   --> src/prepackages/structs.rs:87:8
[INFO] [stdout]    |
[INFO] [stdout] 87 |     fn stretch(&mut self, add_height: u32, add_width: u32) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | Quit,                       // - geen velden (Unit struct)
[INFO] [stdout]    | ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ChangeColor`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | ChangeColor(i32, i32, i32), // - (idem)
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alabama`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Alabama,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Alaska`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Alaska,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Oregon`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Oregon,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Coin`
[INFO] [stdout]  --> src/prepackages/enums/matching.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Coin {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value_in_cents`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 |     fn value_in_cents(&self) -> u8 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `plus_one`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn plus_one(x: Option<i32>) -> Option<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `slice_first_word`
[INFO] [stdout]    --> src/prepackages/ownership.rs:121:4
[INFO] [stdout]     |
[INFO] [stdout] 121 | fn slice_first_word(s: &String) -> &str {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `first_word`
[INFO] [stdout]    --> src/prepackages/ownership.rs:137:4
[INFO] [stdout]     |
[INFO] [stdout] 137 | fn first_word(s: &String) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 37 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.38s
[INFO] running `Command { std: "docker" "inspect" "8854d2071c2351c7f2d6cc74a23c86aec5f60dc2fdd678897b1d7fe61dd69a88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8854d2071c2351c7f2d6cc74a23c86aec5f60dc2fdd678897b1d7fe61dd69a88", kill_on_drop: false }`
[INFO] [stdout] 8854d2071c2351c7f2d6cc74a23c86aec5f60dc2fdd678897b1d7fe61dd69a88