[INFO] cloning repository https://github.com/default-g/rust-exercism
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/default-g/rust-exercism" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdefault-g%2Frust-exercism", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdefault-g%2Frust-exercism'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fb126b458f53d9cb51ed8b26537a454e1eeee3ea
[INFO] testing default-g/rust-exercism against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdefault-g%2Frust-exercism" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/default-g/rust-exercism
[INFO] finished tweaking git repo https://github.com/default-g/rust-exercism
[INFO] tweaked toml for git repo https://github.com/default-g/rust-exercism written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/default-g/rust-exercism on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/default-g/rust-exercism already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a963a1ec8fd1405e17ebecdca8107db597e2bd6550b6089cc239a2a08edd78cb
[INFO] running `Command { std: "docker" "start" "-a" "a963a1ec8fd1405e17ebecdca8107db597e2bd6550b6089cc239a2a08edd78cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a963a1ec8fd1405e17ebecdca8107db597e2bd6550b6089cc239a2a08edd78cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a963a1ec8fd1405e17ebecdca8107db597e2bd6550b6089cc239a2a08edd78cb", kill_on_drop: false }`
[INFO] [stdout] a963a1ec8fd1405e17ebecdca8107db597e2bd6550b6089cc239a2a08edd78cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7e7bf07ab4fb2b0b4217c5826eff423532919a25f9ea1d34e4ccc369e144515b
[INFO] running `Command { std: "docker" "start" "-a" "7e7bf07ab4fb2b0b4217c5826eff423532919a25f9ea1d34e4ccc369e144515b", kill_on_drop: false }`
[INFO] [stderr]    Compiling time v0.3.31
[INFO] [stderr]    Compiling fmt v0.1.0
[INFO] [stderr]    Compiling rust-exercism v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `cmp::Ordering` and `ptr::null`
[INFO] [stdout]  --> src/tasks/poker.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, str::FromStr, ptr::null, cmp::Ordering};
[INFO] [stdout]   |                                               ^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::stdout;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::Write;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tasks::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tasks::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::fmt;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:138:14
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     a += 1;
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/main.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn add_1(mut a: i32) {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_1` is never used
[INFO] [stdout]   --> src/main.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn add_1(mut a: i32) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abbreviate` is never used
[INFO] [stdout]  --> src/tasks/abbreviate.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abbreviate` is never used
[INFO] [stdout]  --> src/tasks/acronym.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Error` is never used
[INFO] [stdout]  --> src/tasks/all_your_base.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum Error {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `convert` is never used
[INFO] [stdout]   --> src/tasks/all_your_base.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn convert(number: &[u32], from_base: u32, to_base: u32) -> Result<Vec<u32>, Error> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Allergies` is never constructed
[INFO] [stdout]  --> src/tasks/allergies.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Allergies {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Allergen` is never used
[INFO] [stdout]  --> src/tasks/allergies.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum Allergen {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `is_allergic_to`, and `allergies` are never used
[INFO] [stdout]   --> src/tasks/allergies.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Allergies {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 36 |     pub fn new(score: u32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub fn is_allergic_to(&self, allergen: &Allergen) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub fn allergies(&self) -> Vec<Allergen> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_armstrong_number` is never used
[INFO] [stdout]  --> src/tasks/armstrong_number.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn is_armstrong_number(num: u32) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `verse` is never used
[INFO] [stdout]  --> src/tasks/beer_song.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn verse(n: u32) -> String {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sing` is never used
[INFO] [stdout]   --> src/tasks/beer_song.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn sing(start: u32, end: u32) -> String {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reply` is never used
[INFO] [stdout]  --> src/tasks/bob.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn reply(message: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square_of_sum` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn square_of_sum(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_of_squares` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn sum_of_squares(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difference` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn difference(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `HighScores` is never constructed
[INFO] [stdout]  --> src/tasks/high_scores.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct HighScores {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `scores`, `latest`, `personal_best`, and `personal_top_three` are never used
[INFO] [stdout]   --> src/tasks/high_scores.rs:7:12
[INFO] [stdout]    |
[INFO] [stdout]  6 | impl HighScores {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout]  7 |     pub fn new(scores: &[u32]) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 11 |     pub fn scores(&self) -> &[u32] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn latest(&self) -> Option<u32> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn personal_best(&self) -> Option<u32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn personal_top_three(&self) -> Vec<u32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_leap_year` is never used
[INFO] [stdout]  --> src/tasks/leap_year.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn is_leap_year(year: u64) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `brackets_are_balanced` is never used
[INFO] [stdout]  --> src/tasks/matching_brackets.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn brackets_are_balanced(string: &str) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nth` is never used
[INFO] [stdout]  --> src/tasks/nth_prime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn nth(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `frequency` is never used
[INFO] [stdout]  --> src/tasks/parallel_letter_frequency.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn frequency(input: &[&str], worker_count: usize) -> HashMap<char, usize> {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Rank` is never used
[INFO] [stdout]  --> src/tasks/poker.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Rank {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Suit` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Suit {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Card` is never constructed
[INFO] [stdout]   --> src/tasks/poker.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct Card {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CardParseError` is never constructed
[INFO] [stdout]   --> src/tasks/poker.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct CardParseError;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `n_of_a_kind` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn n_of_a_kind(mut hand: Vec<Card>, n: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five_of_a_kind` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn five_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `four_of_a_kind` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn four_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `three_of_a_kind` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn three_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `full_house` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn full_house(mut hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flush` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:123:4
[INFO] [stdout]     |
[INFO] [stdout] 123 | fn flush(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_pair` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `one_pair` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:133:4
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `high_card` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:138:4
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `highest_rank` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn highest_rank(mut hand: Vec<Card>) -> Card {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `straigh` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:148:4
[INFO] [stdout]     |
[INFO] [stdout] 148 | fn straigh(mut hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `straigh_of_flush` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn straigh_of_flush(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `winning_hands` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub fn winning_hands<'a>(hands: &[&'a str]) -> Vec<&'a str> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factors` is never used
[INFO] [stdout]  --> src/tasks/prime_factors.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn factors(mut n: u64) -> Vec<u64> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_proverb` is never used
[INFO] [stdout]  --> src/tasks/proverb.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn build_proverb(list: &[&str]) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Duration` is never constructed
[INFO] [stdout]  --> src/tasks/space_age.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Duration {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Planet` is never used
[INFO] [stdout]   --> src/tasks/space_age.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub trait Planet {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mercury` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Mercury;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Venus` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Venus;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Earth` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct Earth;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mars` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct Mars;
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Jupiter` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Jupiter;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Saturn` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct Saturn;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Uranus` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Uranus;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Neptune` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Neptune;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_of_multiples` is never used
[INFO] [stdout]  --> src/tasks/sum_of_multiplies.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sum_of_multiples(limit: u32, factors: &[u32]) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.31s
[INFO] running `Command { std: "docker" "inspect" "7e7bf07ab4fb2b0b4217c5826eff423532919a25f9ea1d34e4ccc369e144515b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7e7bf07ab4fb2b0b4217c5826eff423532919a25f9ea1d34e4ccc369e144515b", kill_on_drop: false }`
[INFO] [stdout] 7e7bf07ab4fb2b0b4217c5826eff423532919a25f9ea1d34e4ccc369e144515b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c4b507e95138f5615d01b841ba29f76bd25f3eebb2ca9a1b71f2fa4ec840959
[INFO] running `Command { std: "docker" "start" "-a" "5c4b507e95138f5615d01b841ba29f76bd25f3eebb2ca9a1b71f2fa4ec840959", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-exercism v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `cmp::Ordering` and `ptr::null`
[INFO] [stdout]  --> src/tasks/poker.rs:1:47
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{collections::HashMap, str::FromStr, ptr::null, cmp::Ordering};
[INFO] [stdout]   |                                               ^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashSet`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::HashSet;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::stdout`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::stdout;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::io::Write;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tasks::*`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use tasks::*;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use std::fmt;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:128:13
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:133:13
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hand`
[INFO] [stdout]    --> src/tasks/poker.rs:138:14
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `a` is never read
[INFO] [stdout]   --> src/main.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     a += 1;
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/main.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn add_1(mut a: i32) {
[INFO] [stdout]    |              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_1` is never used
[INFO] [stdout]   --> src/main.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn add_1(mut a: i32) {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abbreviate` is never used
[INFO] [stdout]  --> src/tasks/abbreviate.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `abbreviate` is never used
[INFO] [stdout]  --> src/tasks/acronym.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Error` is never used
[INFO] [stdout]  --> src/tasks/all_your_base.rs:4:10
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub enum Error {
[INFO] [stdout]   |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `convert` is never used
[INFO] [stdout]   --> src/tasks/all_your_base.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn convert(number: &[u32], from_base: u32, to_base: u32) -> Result<Vec<u32>, Error> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Allergies` is never constructed
[INFO] [stdout]  --> src/tasks/allergies.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Allergies {
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Allergen` is never used
[INFO] [stdout]  --> src/tasks/allergies.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub enum Allergen {
[INFO] [stdout]   |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `is_allergic_to`, and `allergies` are never used
[INFO] [stdout]   --> src/tasks/allergies.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Allergies {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 36 |     pub fn new(score: u32) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 50 |     pub fn is_allergic_to(&self, allergen: &Allergen) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     pub fn allergies(&self) -> Vec<Allergen> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_armstrong_number` is never used
[INFO] [stdout]  --> src/tasks/armstrong_number.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn is_armstrong_number(num: u32) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `verse` is never used
[INFO] [stdout]  --> src/tasks/beer_song.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn verse(n: u32) -> String {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sing` is never used
[INFO] [stdout]   --> src/tasks/beer_song.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn sing(start: u32, end: u32) -> String {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reply` is never used
[INFO] [stdout]  --> src/tasks/bob.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn reply(message: &str) -> &str {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `square_of_sum` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn square_of_sum(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_of_squares` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn sum_of_squares(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `difference` is never used
[INFO] [stdout]  --> src/tasks/difference_of_squares.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn difference(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `HighScores` is never constructed
[INFO] [stdout]  --> src/tasks/high_scores.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub struct HighScores {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `scores`, `latest`, `personal_best`, and `personal_top_three` are never used
[INFO] [stdout]   --> src/tasks/high_scores.rs:7:12
[INFO] [stdout]    |
[INFO] [stdout]  6 | impl HighScores {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout]  7 |     pub fn new(scores: &[u32]) -> Self {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 11 |     pub fn scores(&self) -> &[u32] {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn latest(&self) -> Option<u32> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn personal_best(&self) -> Option<u32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn personal_top_three(&self) -> Vec<u32> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `is_leap_year` is never used
[INFO] [stdout]  --> src/tasks/leap_year.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn is_leap_year(year: u64) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `brackets_are_balanced` is never used
[INFO] [stdout]  --> src/tasks/matching_brackets.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn brackets_are_balanced(string: &str) -> bool {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `nth` is never used
[INFO] [stdout]  --> src/tasks/nth_prime.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn nth(n: u32) -> u32 {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `frequency` is never used
[INFO] [stdout]  --> src/tasks/parallel_letter_frequency.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn frequency(input: &[&str], worker_count: usize) -> HashMap<char, usize> {
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Rank` is never used
[INFO] [stdout]  --> src/tasks/poker.rs:4:6
[INFO] [stdout]   |
[INFO] [stdout] 4 | enum Rank {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Suit` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | enum Suit {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Card` is never constructed
[INFO] [stdout]   --> src/tasks/poker.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct Card {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `CardParseError` is never constructed
[INFO] [stdout]   --> src/tasks/poker.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct CardParseError;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `n_of_a_kind` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn n_of_a_kind(mut hand: Vec<Card>, n: usize) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `five_of_a_kind` is never used
[INFO] [stdout]   --> src/tasks/poker.rs:99:4
[INFO] [stdout]    |
[INFO] [stdout] 99 | fn five_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `four_of_a_kind` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:104:4
[INFO] [stdout]     |
[INFO] [stdout] 104 | fn four_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `three_of_a_kind` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:109:4
[INFO] [stdout]     |
[INFO] [stdout] 109 | fn three_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `full_house` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn full_house(mut hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `flush` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:123:4
[INFO] [stdout]     |
[INFO] [stdout] 123 | fn flush(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_pair` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `one_pair` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:133:4
[INFO] [stdout]     |
[INFO] [stdout] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `high_card` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:138:4
[INFO] [stdout]     |
[INFO] [stdout] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `highest_rank` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:142:4
[INFO] [stdout]     |
[INFO] [stdout] 142 | fn highest_rank(mut hand: Vec<Card>) -> Card {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `straigh` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:148:4
[INFO] [stdout]     |
[INFO] [stdout] 148 | fn straigh(mut hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `straigh_of_flush` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:170:4
[INFO] [stdout]     |
[INFO] [stdout] 170 | fn straigh_of_flush(hand: Vec<Card>) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `winning_hands` is never used
[INFO] [stdout]    --> src/tasks/poker.rs:183:8
[INFO] [stdout]     |
[INFO] [stdout] 183 | pub fn winning_hands<'a>(hands: &[&'a str]) -> Vec<&'a str> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factors` is never used
[INFO] [stdout]  --> src/tasks/prime_factors.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn factors(mut n: u64) -> Vec<u64> {
[INFO] [stdout]   |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_proverb` is never used
[INFO] [stdout]  --> src/tasks/proverb.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn build_proverb(list: &[&str]) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Duration` is never constructed
[INFO] [stdout]  --> src/tasks/space_age.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Duration {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Planet` is never used
[INFO] [stdout]   --> src/tasks/space_age.rs:15:11
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub trait Planet {
[INFO] [stdout]    |           ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mercury` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:23:12
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub struct Mercury;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Venus` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub struct Venus;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Earth` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:25:12
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct Earth;
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Mars` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct Mars;
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Jupiter` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Jupiter;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Saturn` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:28:12
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub struct Saturn;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Uranus` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct Uranus;
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Neptune` is never constructed
[INFO] [stdout]   --> src/tasks/space_age.rs:30:12
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub struct Neptune;
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_of_multiples` is never used
[INFO] [stdout]  --> src/tasks/sum_of_multiplies.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sum_of_multiples(limit: u32, factors: &[u32]) -> u32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "5c4b507e95138f5615d01b841ba29f76bd25f3eebb2ca9a1b71f2fa4ec840959", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c4b507e95138f5615d01b841ba29f76bd25f3eebb2ca9a1b71f2fa4ec840959", kill_on_drop: false }`
[INFO] [stdout] 5c4b507e95138f5615d01b841ba29f76bd25f3eebb2ca9a1b71f2fa4ec840959
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 5335c7e9a6b9ccb83c494a39e57678458b8d4442680f1a9c8de1d6ce3777eca6
[INFO] running `Command { std: "docker" "start" "-a" "5335c7e9a6b9ccb83c494a39e57678458b8d4442680f1a9c8de1d6ce3777eca6", kill_on_drop: false }`
[INFO] [stderr] warning: unused imports: `cmp::Ordering` and `ptr::null`
[INFO] [stderr]  --> src/tasks/poker.rs:1:47
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{collections::HashMap, str::FromStr, ptr::null, cmp::Ordering};
[INFO] [stderr]   |                                               ^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/main.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashSet`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::HashSet;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::stdout`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::io::stdout;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Write`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tasks::*`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use tasks::*;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::fmt;
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hand`
[INFO] [stderr]    --> src/tasks/poker.rs:128:13
[INFO] [stderr]     |
[INFO] [stderr] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hand`
[INFO] [stderr]    --> src/tasks/poker.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |             ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `hand`
[INFO] [stderr]    --> src/tasks/poker.rs:138:14
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_hand`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `a` is never read
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     a += 1;
[INFO] [stderr]    |     ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> src/main.rs:12:14
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn add_1(mut a: i32) {
[INFO] [stderr]    |              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: function `add_1` is never used
[INFO] [stderr]   --> src/main.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn add_1(mut a: i32) {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `abbreviate` is never used
[INFO] [stderr]  --> src/tasks/abbreviate.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `abbreviate` is never used
[INFO] [stderr]  --> src/tasks/acronym.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn abbreviate(phrase: &str) -> String {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Error` is never used
[INFO] [stderr]  --> src/tasks/all_your_base.rs:4:10
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub enum Error {
[INFO] [stderr]   |          ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `convert` is never used
[INFO] [stderr]   --> src/tasks/all_your_base.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn convert(number: &[u32], from_base: u32, to_base: u32) -> Result<Vec<u32>, Error> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Allergies` is never constructed
[INFO] [stderr]  --> src/tasks/allergies.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub struct Allergies {
[INFO] [stderr]   |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Allergen` is never used
[INFO] [stderr]  --> src/tasks/allergies.rs:6:10
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub enum Allergen {
[INFO] [stderr]   |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `is_allergic_to`, and `allergies` are never used
[INFO] [stderr]   --> src/tasks/allergies.rs:36:12
[INFO] [stderr]    |
[INFO] [stderr] 35 | impl Allergies {
[INFO] [stderr]    | -------------- associated items in this implementation
[INFO] [stderr] 36 |     pub fn new(score: u32) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 50 |     pub fn is_allergic_to(&self, allergen: &Allergen) -> bool {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 54 |     pub fn allergies(&self) -> Vec<Allergen> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `is_armstrong_number` is never used
[INFO] [stderr]  --> src/tasks/armstrong_number.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_armstrong_number(num: u32) -> bool {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `verse` is never used
[INFO] [stderr]  --> src/tasks/beer_song.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub fn verse(n: u32) -> String {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sing` is never used
[INFO] [stderr]   --> src/tasks/beer_song.rs:11:8
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn sing(start: u32, end: u32) -> String {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `reply` is never used
[INFO] [stderr]  --> src/tasks/bob.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn reply(message: &str) -> &str {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `square_of_sum` is never used
[INFO] [stderr]  --> src/tasks/difference_of_squares.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn square_of_sum(n: u32) -> u32 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sum_of_squares` is never used
[INFO] [stderr]  --> src/tasks/difference_of_squares.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn sum_of_squares(n: u32) -> u32 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `difference` is never used
[INFO] [stderr]  --> src/tasks/difference_of_squares.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 | pub fn difference(n: u32) -> u32 {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `HighScores` is never constructed
[INFO] [stderr]  --> src/tasks/high_scores.rs:2:12
[INFO] [stderr]   |
[INFO] [stderr] 2 | pub struct HighScores {
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `scores`, `latest`, `personal_best`, and `personal_top_three` are never used
[INFO] [stderr]   --> src/tasks/high_scores.rs:7:12
[INFO] [stderr]    |
[INFO] [stderr]  6 | impl HighScores {
[INFO] [stderr]    | --------------- associated items in this implementation
[INFO] [stderr]  7 |     pub fn new(scores: &[u32]) -> Self {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] ...
[INFO] [stderr] 11 |     pub fn scores(&self) -> &[u32] {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 15 |     pub fn latest(&self) -> Option<u32> {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 19 |     pub fn personal_best(&self) -> Option<u32> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 23 |     pub fn personal_top_three(&self) -> Vec<u32> {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `is_leap_year` is never used
[INFO] [stderr]  --> src/tasks/leap_year.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn is_leap_year(year: u64) -> bool {
[INFO] [stderr]   |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `brackets_are_balanced` is never used
[INFO] [stderr]  --> src/tasks/matching_brackets.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn brackets_are_balanced(string: &str) -> bool {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `nth` is never used
[INFO] [stderr]  --> src/tasks/nth_prime.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn nth(n: u32) -> u32 {
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `frequency` is never used
[INFO] [stderr]  --> src/tasks/parallel_letter_frequency.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn frequency(input: &[&str], worker_count: usize) -> HashMap<char, usize> {
[INFO] [stderr]   |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Rank` is never used
[INFO] [stderr]  --> src/tasks/poker.rs:4:6
[INFO] [stderr]   |
[INFO] [stderr] 4 | enum Rank {
[INFO] [stderr]   |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Suit` is never used
[INFO] [stderr]   --> src/tasks/poker.rs:21:6
[INFO] [stderr]    |
[INFO] [stderr] 21 | enum Suit {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Card` is never constructed
[INFO] [stderr]   --> src/tasks/poker.rs:29:8
[INFO] [stderr]    |
[INFO] [stderr] 29 | struct Card {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `CardParseError` is never constructed
[INFO] [stderr]   --> src/tasks/poker.rs:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 | struct CardParseError;
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `n_of_a_kind` is never used
[INFO] [stderr]   --> src/tasks/poker.rs:87:4
[INFO] [stderr]    |
[INFO] [stderr] 87 | fn n_of_a_kind(mut hand: Vec<Card>, n: usize) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `five_of_a_kind` is never used
[INFO] [stderr]   --> src/tasks/poker.rs:99:4
[INFO] [stderr]    |
[INFO] [stderr] 99 | fn five_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `four_of_a_kind` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:104:4
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn four_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `three_of_a_kind` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:109:4
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn three_of_a_kind(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `full_house` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:114:4
[INFO] [stderr]     |
[INFO] [stderr] 114 | fn full_house(mut hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `flush` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:123:4
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn flush(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `two_pair` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:128:4
[INFO] [stderr]     |
[INFO] [stderr] 128 | fn two_pair(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `one_pair` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:133:4
[INFO] [stderr]     |
[INFO] [stderr] 133 | fn one_pair(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `high_card` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:138:4
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn high_card(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `highest_rank` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:142:4
[INFO] [stderr]     |
[INFO] [stderr] 142 | fn highest_rank(mut hand: Vec<Card>) -> Card {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `straigh` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:148:4
[INFO] [stderr]     |
[INFO] [stderr] 148 | fn straigh(mut hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `straigh_of_flush` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:170:4
[INFO] [stderr]     |
[INFO] [stderr] 170 | fn straigh_of_flush(hand: Vec<Card>) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `winning_hands` is never used
[INFO] [stderr]    --> src/tasks/poker.rs:183:8
[INFO] [stderr]     |
[INFO] [stderr] 183 | pub fn winning_hands<'a>(hands: &[&'a str]) -> Vec<&'a str> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `factors` is never used
[INFO] [stderr]  --> src/tasks/prime_factors.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn factors(mut n: u64) -> Vec<u64> {
[INFO] [stderr]   |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `build_proverb` is never used
[INFO] [stderr]  --> src/tasks/proverb.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn build_proverb(list: &[&str]) -> String {
[INFO] [stderr]   |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Duration` is never constructed
[INFO] [stderr]  --> src/tasks/space_age.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct Duration {
[INFO] [stderr]   |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Planet` is never used
[INFO] [stderr]   --> src/tasks/space_age.rs:15:11
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub trait Planet {
[INFO] [stderr]    |           ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Mercury` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:23:12
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub struct Mercury;
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Venus` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:24:12
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub struct Venus;
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Earth` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 25 | pub struct Earth;
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Mars` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:26:12
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub struct Mars;
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Jupiter` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub struct Jupiter;
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Saturn` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:28:12
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub struct Saturn;
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Uranus` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:29:12
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub struct Uranus;
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Neptune` is never constructed
[INFO] [stderr]   --> src/tasks/space_age.rs:30:12
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub struct Neptune;
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `sum_of_multiples` is never used
[INFO] [stderr]  --> src/tasks/sum_of_multiplies.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn sum_of_multiples(limit: u32, factors: &[u32]) -> u32 {
[INFO] [stderr]   |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-exercism` (bin "rust-exercism" test) generated 63 warnings (run `cargo fix --bin "rust-exercism" --tests` to apply 7 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_exercism-48128c2e51044193)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "5335c7e9a6b9ccb83c494a39e57678458b8d4442680f1a9c8de1d6ce3777eca6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5335c7e9a6b9ccb83c494a39e57678458b8d4442680f1a9c8de1d6ce3777eca6", kill_on_drop: false }`
[INFO] [stdout] 5335c7e9a6b9ccb83c494a39e57678458b8d4442680f1a9c8de1d6ce3777eca6