[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] 044cb69013acceea9c544db899cbfda8958dbbf9
[INFO] checking Medsko/study-crate against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMedsko%2Fstudy-crate" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Medsko/study-crate on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "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-6/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" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.licence
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad6002279858dd00f2bb65df030634d532c99899fd29674265aa9ecfc7838ed7
[INFO] running `Command { std: "docker" "start" "-a" "ad6002279858dd00f2bb65df030634d532c99899fd29674265aa9ecfc7838ed7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad6002279858dd00f2bb65df030634d532c99899fd29674265aa9ecfc7838ed7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad6002279858dd00f2bb65df030634d532c99899fd29674265aa9ecfc7838ed7", kill_on_drop: false }`
[INFO] [stdout] ad6002279858dd00f2bb65df030634d532c99899fd29674265aa9ecfc7838ed7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8086fd315a7b6a4d7e54cd6dd5d310f99ea3941c1cd7d087967b972be5a98896
[INFO] running `Command { std: "docker" "start" "-a" "8086fd315a7b6a4d7e54cd6dd5d310f99ea3941c1cd7d087967b972be5a98896", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.licence
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking getrandom v0.1.14
[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: `key`
[INFO] [stdout]   --> src/lib.rs:45:39
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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]    = note: `#[warn(unused_variables)]` on by default
[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: 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: `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] 
[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: `key`
[INFO] [stdout]   --> src/lib.rs:45:39
[INFO] [stdout]    |
[INFO] [stdout] 45 |     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]    = note: `#[warn(unused_variables)]` on by default
[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: 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: `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] 
[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: function is never used: `exercise`
[INFO] [stdout]  --> src/collections/exercises.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn exercise() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `employee_registration`
[INFO] [stdout]   --> src/collections/exercises.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub fn employee_registration() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_employee`
[INFO] [stdout]   --> src/collections/exercises.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn remove_employee(register: &mut HashMap<String, Vec<String>>, other_words: &mut SplitWhitespace) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `extract_full_name`
[INFO] [stdout]   --> src/collections/exercises.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn extract_full_name(words: &mut SplitWhitespace, stop: &str) -> Result<String, String> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `register_employee`
[INFO] [stdout]    --> src/collections/exercises.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn register_employee(register: &mut HashMap<String, Vec<String>>, other_words: &mut SplitWhitespace) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_register`
[INFO] [stdout]    --> src/collections/exercises.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn print_register(register: &HashMap<String, Vec<String>>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hash_it_up`
[INFO] [stdout]  --> src/collections/hashmaps.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hash_it_up() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_stuff`
[INFO] [stdout]  --> src/collections/strings.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn string_stuff() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `got_game`
[INFO] [stdout]   --> src/collections/strings.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn got_game() -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `to_pig_latin`
[INFO] [stdout]   --> src/collections/strings.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn to_pig_latin(kosher: &String) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `is_vowel`
[INFO] [stdout]   --> src/collections/strings.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn is_vowel(maybe_vowel: &char) -> bool {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]  --> src/prepackages/gg.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Guess {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/prepackages/gg.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub fn new(value: i32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/prepackages/gg.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn value(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play_the_guessing_game`
[INFO] [stdout]   --> src/prepackages/gg.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn play_the_guessing_game() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `own`
[INFO] [stdout]  --> src/prepackages/ownership.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn own() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/prepackages/ownership.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn takes_ownership(val: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/prepackages/ownership.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn makes_copy(number: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `references_and_borrowing`
[INFO] [stdout]   --> src/prepackages/ownership.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn references_and_borrowing() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_to_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn string_to_length(s: String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn print_length(s: &String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `legalized_modification`
[INFO] [stdout]    --> src/prepackages/ownership.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn legalized_modification(s: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `slice_stuff`
[INFO] [stdout]    --> src/prepackages/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn slice_stuff() {
[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: 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] 
[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: `structure`
[INFO] [stdout]   --> src/prepackages/structs.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn structure() {
[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:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn build_user(email: String, username1: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> src/prepackages/structs.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `longest_side`
[INFO] [stdout]   --> src/prepackages/structs.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn longest_side(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_square`
[INFO] [stdout]   --> src/prepackages/structs.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     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:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 |     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:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     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:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn stretch(&mut self, add_height: u32, add_width: u32) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/prepackages/structs.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `shrink`
[INFO] [stdout]    --> src/prepackages/structs.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn shrink(&mut self, take_height: u32, take_width: u32) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rectangles`
[INFO] [stdout]    --> src/prepackages/structs.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn rectangles() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/prepackages/structs.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variate`
[INFO] [stdout]  --> src/prepackages/variables.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn variate() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function_stuff`
[INFO] [stdout]   --> src/prepackages/variables.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn function_stuff() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_one`
[INFO] [stdout]   --> src/prepackages/variables.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn returns_one() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fizz_buzz`
[INFO] [stdout]   --> src/prepackages/variables.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn fizz_buzz(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_return`
[INFO] [stdout]   --> src/prepackages/variables.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn loop_return(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `countdown`
[INFO] [stdout]   --> src/prepackages/variables.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn countdown(loops: i32) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `for_loop`
[INFO] [stdout]   --> src/prepackages/variables.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn for_loop(placement: i32) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `range_for_loop`
[INFO] [stdout]   --> src/prepackages/variables.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn range_for_loop(until: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reverse_range_for_loop`
[INFO] [stdout]    --> src/prepackages/variables.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn reverse_range_for_loop(from: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]  --> src/prepackages/enums/enums.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     V4,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `exercise`
[INFO] [stdout]  --> src/collections/exercises.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn exercise() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/prepackages/enums/enums.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     V6
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConciseIpAddr`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ConciseIpAddr {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `employee_registration`
[INFO] [stdout]   --> src/collections/exercises.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | pub fn employee_registration() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `remove_employee`
[INFO] [stdout]   --> src/collections/exercises.rs:70:4
[INFO] [stdout]    |
[INFO] [stdout] 70 | fn remove_employee(register: &mut HashMap<String, Vec<String>>, other_words: &mut SplitWhitespace) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `enumerate`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn enumerate() {
[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: function is never used: `extract_full_name`
[INFO] [stdout]   --> src/collections/exercises.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn extract_full_name(words: &mut SplitWhitespace, stop: &str) -> Result<String, String> {
[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: function is never used: `register_employee`
[INFO] [stdout]    --> src/collections/exercises.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn register_employee(register: &mut HashMap<String, Vec<String>>, other_words: &mut SplitWhitespace) {
[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: function is never used: `print_register`
[INFO] [stdout]    --> src/collections/exercises.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn print_register(register: &HashMap<String, Vec<String>>) {
[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: `hash_it_up`
[INFO] [stdout]  --> src/collections/hashmaps.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hash_it_up() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `match_stuff`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn match_stuff() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_stuff`
[INFO] [stdout]  --> src/collections/strings.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn string_stuff() {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_someone`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn find_someone(optionals: &[Option<i32>]) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `got_game`
[INFO] [stdout]   --> src/collections/strings.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn got_game() -> String {
[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: `options`
[INFO] [stdout]  --> src/prepackages/enums/options.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn options() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]  --> src/prepackages/gg.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     value: i32
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `value`
[INFO] [stdout]   --> src/prepackages/gg.rs:19:12
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn value(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `play_the_guessing_game`
[INFO] [stdout]   --> src/prepackages/gg.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn play_the_guessing_game() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `own`
[INFO] [stdout]  --> src/prepackages/ownership.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn own() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/prepackages/ownership.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn takes_ownership(val: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `makes_copy`
[INFO] [stdout]   --> src/prepackages/ownership.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn makes_copy(number: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `references_and_borrowing`
[INFO] [stdout]   --> src/prepackages/ownership.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn references_and_borrowing() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `calculate_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn calculate_length(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_to_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn string_to_length(s: String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_length`
[INFO] [stdout]   --> src/prepackages/ownership.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn print_length(s: &String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `legalized_modification`
[INFO] [stdout]    --> src/prepackages/ownership.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn legalized_modification(s: &mut String) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `slice_stuff`
[INFO] [stdout]    --> src/prepackages/ownership.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn slice_stuff() {
[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: 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] 
[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: `structure`
[INFO] [stdout]   --> src/prepackages/structs.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn structure() {
[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:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn build_user(email: String, username1: String) -> User {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `area`
[INFO] [stdout]   --> src/prepackages/structs.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn area(&self) -> u32 {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `longest_side`
[INFO] [stdout]   --> src/prepackages/structs.rs:65:8
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn longest_side(&self) -> u32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_square`
[INFO] [stdout]   --> src/prepackages/structs.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 72 |     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:77:8
[INFO] [stdout]    |
[INFO] [stdout] 77 |     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:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     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:85:8
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn stretch(&mut self, add_height: u32, add_width: u32) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `square`
[INFO] [stdout]   --> src/prepackages/structs.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 |     fn square(size: u32) -> Rectangle {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `shrink`
[INFO] [stdout]    --> src/prepackages/structs.rs:101:8
[INFO] [stdout]     |
[INFO] [stdout] 101 |     fn shrink(&mut self, take_height: u32, take_width: u32) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `rectangles`
[INFO] [stdout]    --> src/prepackages/structs.rs:107:4
[INFO] [stdout]     |
[INFO] [stdout] 107 | fn rectangles() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `area`
[INFO] [stdout]    --> src/prepackages/structs.rs:131:4
[INFO] [stdout]     |
[INFO] [stdout] 131 | fn area(rectangle: &Rectangle) -> u32 {
[INFO] [stdout]     |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `variate`
[INFO] [stdout]  --> src/prepackages/variables.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn variate() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `function_stuff`
[INFO] [stdout]   --> src/prepackages/variables.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn function_stuff() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `returns_one`
[INFO] [stdout]   --> src/prepackages/variables.rs:56:4
[INFO] [stdout]    |
[INFO] [stdout] 56 | fn returns_one() -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fizz_buzz`
[INFO] [stdout]   --> src/prepackages/variables.rs:60:4
[INFO] [stdout]    |
[INFO] [stdout] 60 | fn fizz_buzz(x: i32) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `loop_return`
[INFO] [stdout]   --> src/prepackages/variables.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn loop_return(x: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `countdown`
[INFO] [stdout]   --> src/prepackages/variables.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 81 | fn countdown(loops: i32) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `for_loop`
[INFO] [stdout]   --> src/prepackages/variables.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn for_loop(placement: i32) {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `range_for_loop`
[INFO] [stdout]   --> src/prepackages/variables.rs:98:4
[INFO] [stdout]    |
[INFO] [stdout] 98 | fn range_for_loop(until: i32) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reverse_range_for_loop`
[INFO] [stdout]    --> src/prepackages/variables.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn reverse_range_for_loop(from: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V4`
[INFO] [stdout]  --> src/prepackages/enums/enums.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     V4,
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `V6`
[INFO] [stdout]  --> src/prepackages/enums/enums.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     V6
[INFO] [stdout]   |     ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `ConciseIpAddr`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:10:6
[INFO] [stdout]    |
[INFO] [stdout] 10 | enum ConciseIpAddr {
[INFO] [stdout]    |      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `call`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn call(&self) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `enumerate`
[INFO] [stdout]   --> src/prepackages/enums/enums.rs:42:8
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub fn enumerate() {
[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: `match_stuff`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn match_stuff() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `find_someone`
[INFO] [stdout]   --> src/prepackages/enums/matching.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn find_someone(optionals: &[Option<i32>]) {
[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: `options`
[INFO] [stdout]  --> src/prepackages/enums/options.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn options() {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 80 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 76 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `SystemTimeError`
[INFO] [stdout]   --> src/fp/closures.rs:79:33
[INFO] [stdout]    |
[INFO] [stdout] 79 |     use std::time::{SystemTime, SystemTimeError};
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[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]    = note: `#[warn(unused_variables)]` on by default
[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: `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] 
[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: `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: unused variable: `nums`
[INFO] [stdout]   --> src/fp/closures.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |         |nums| {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/fp/closures.rs:49:6
[INFO] [stdout]    |
[INFO] [stdout] 49 |     |num| {
[INFO] [stdout]    |      ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/fp/closures.rs:59:45
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut expensive_result = Cacher::new(|num| {
[INFO] [stdout]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[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]    = note: `#[warn(unused_variables)]` on by default
[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: `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] 
[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: `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: unused variable: `nums`
[INFO] [stdout]   --> src/fp/closures.rs:52:10
[INFO] [stdout]    |
[INFO] [stdout] 52 |         |nums| {
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/fp/closures.rs:49:6
[INFO] [stdout]    |
[INFO] [stdout] 49 |     |num| {
[INFO] [stdout]    |      ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]   --> src/fp/closures.rs:59:45
[INFO] [stdout]    |
[INFO] [stdout] 59 |     let mut expensive_result = Cacher::new(|num| {
[INFO] [stdout]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]    --> src/fp/closures.rs:118:13
[INFO] [stdout]     |
[INFO] [stdout] 118 |         let v1 = c.value(1);
[INFO] [stdout]     |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_a`
[INFO] [stdout]   --> src/pointers/smart.rs:54:13
[INFO] [stdout]    |
[INFO] [stdout] 54 |         let reference_a = RcList::Cons(3, Rc::clone(&oc_list));
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reference_b`
[INFO] [stdout]   --> src/pointers/smart.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 57 |             let reference_b = RcList::Cons(4, Rc::clone(&oc_list));
[INFO] [stdout]    |                 ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reference_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `boxy`
[INFO] [stdout]   --> src/pointers/smart.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let boxy = CustomSmartPointer{
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_boxy`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/pointers/smart.rs:91:13
[INFO] [stdout]    |
[INFO] [stdout] 91 |         let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 23 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 21.47s
[INFO] running `Command { std: "docker" "inspect" "8086fd315a7b6a4d7e54cd6dd5d310f99ea3941c1cd7d087967b972be5a98896", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8086fd315a7b6a4d7e54cd6dd5d310f99ea3941c1cd7d087967b972be5a98896", kill_on_drop: false }`
[INFO] [stdout] 8086fd315a7b6a4d7e54cd6dd5d310f99ea3941c1cd7d087967b972be5a98896