[INFO] updating cached repository https://github.com/evgeni-nabokov/codewars-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/evgeni-nabokov/codewars-rust
[INFO] [stderr]    3d3196e..39732a5  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 39732a50a7ad5f30dac91070cc319d2a76d5764e
[INFO] testing evgeni-nabokov/codewars-rust against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fevgeni-nabokov%2Fcodewars-rust" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/evgeni-nabokov/codewars-rust on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/evgeni-nabokov/codewars-rust
[INFO] finished tweaking git repo https://github.com/evgeni-nabokov/codewars-rust
[INFO] tweaked toml for git repo https://github.com/evgeni-nabokov/codewars-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/evgeni-nabokov/codewars-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 30c0f44efda7d0726ac1681290720b47453d726fbb23e1c325b62a5dccbdab75
[INFO] running `"docker" "start" "-a" "30c0f44efda7d0726ac1681290720b47453d726fbb23e1c325b62a5dccbdab75"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling regex v1.3.1
[INFO] [stderr]    Compiling codewars v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::Parenthesis::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use self::Parenthesis::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::Operator::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::Operator::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_4/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_6/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_6/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/kyu_6/mod.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                                 ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Match`
[INFO] [stderr]  --> src/kyu_6/mod.rs:5:20
[INFO] [stderr]   |
[INFO] [stderr] 5 | use regex::{Regex, Match};
[INFO] [stderr]   |                    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_7/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp::Ordering::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_7/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stderr]  --> src/kyu_7/mod.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/kyu_8/mod.rs:17:25
[INFO] [stderr]    |
[INFO] [stderr] 17 |     arr.iter().fold(0, |mut acc, &n| acc + if n > 0 { n } else { 0 })
[INFO] [stderr]    |                         ----^^^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_prime`
[INFO] [stderr]  --> src/common/mod.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn is_prime(n: &u64) -> bool {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mod_pow`
[INFO] [stderr]   --> src/common/mod.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub fn mod_pow(base: u64, exp: u64, modulus: u64) -> u64 {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PRIME_NUMBERS`
[INFO] [stderr]    --> src/common/mod.rs:38:1
[INFO] [stderr]     |
[INFO] [stderr] 38  | / pub const PRIME_NUMBERS: [u64; 3330] = [
[INFO] [stderr] 39  | |     2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,
[INFO] [stderr] 40  | |     103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,
[INFO] [stderr] 41  | |     199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,
[INFO] [stderr] ...   |
[INFO] [stderr] 286 | |     26839,26849,26861,26863,26879,26881,26891,26893,26903,26921,26927,26947
[INFO] [stderr] 287 | | ];
[INFO] [stderr]     | |__^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LAST_DIGITS`
[INFO] [stderr]    --> src/common/mod.rs:289:1
[INFO] [stderr]     |
[INFO] [stderr] 289 | / pub const LAST_DIGITS: [[u8; 4]; 10] = [
[INFO] [stderr] 290 | |     [0, 0, 0, 0],
[INFO] [stderr] 291 | |     [1, 1, 1, 1],
[INFO] [stderr] 292 | |     [6, 2, 4, 8],
[INFO] [stderr] ...   |
[INFO] [stderr] 299 | |     [1, 9, 1, 9],
[INFO] [stderr] 300 | | ];
[INFO] [stderr]     | |__^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calc`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:13:8
[INFO] [stderr]    |
[INFO] [stderr] 13 | pub fn calc(expression: &str) -> f64 {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Scalar`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     Scalar(Number),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Operator`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 |     Operator(Operator),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Parenthesis`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     Parenthesis(Parenthesis),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `UnaryMinus`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     UnaryMinus
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_number`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn is_number(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_operator`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn is_operator(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_parenthesis`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:44:5
[INFO] [stderr]    |
[INFO] [stderr] 44 |     pub fn is_parenthesis(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_unary_minus`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn is_unary_minus(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_opening_parenthesis`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:58:5
[INFO] [stderr]    |
[INFO] [stderr] 58 |     pub fn is_opening_parenthesis(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_closing_parenthesis`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:65:5
[INFO] [stderr]    |
[INFO] [stderr] 65 |     pub fn is_closing_parenthesis(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `apply_unary_minus`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     pub fn apply_unary_minus(&self) -> Number {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_sub`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:100:5
[INFO] [stderr]     |
[INFO] [stderr] 100 |     pub fn is_sub(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `precedence`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:107:5
[INFO] [stderr]     |
[INFO] [stderr] 107 |     pub fn precedence(&self) -> u8 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `apply`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:114:5
[INFO] [stderr]     |
[INFO] [stderr] 114 |     pub fn apply(&self, num_1: Number, num_2: Number) -> Number {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_opening`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     pub fn is_opening(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `evaluate_postfix_expression`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:163:4
[INFO] [stderr]     |
[INFO] [stderr] 163 | fn evaluate_postfix_expression(tokens: Vec<Token>) -> f64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `convert_to_postfix_notation`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:192:4
[INFO] [stderr]     |
[INFO] [stderr] 192 | fn convert_to_postfix_notation(tokens: Vec<Token>) -> Vec<Token> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `split_into_tokens`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:229:4
[INFO] [stderr]     |
[INFO] [stderr] 229 | fn split_into_tokens(expression: &str) -> Vec<Token> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_number`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:271:4
[INFO] [stderr]     |
[INFO] [stderr] 271 | fn parse_number(digits: &[char]) -> Token {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calc`
[INFO] [stderr]  --> src/kyu_2/mod.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn calc(expression: &str) -> f64 {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `last_digit2`
[INFO] [stderr]  --> src/kyu_3/mod.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn last_digit2(list: &[u64]) -> u64 {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `try_to_reduce_list`
[INFO] [stderr]   --> src/kyu_3/mod.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn try_to_reduce_list(list: &[u64]) -> Vec<u64> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `spiralize`
[INFO] [stderr]   --> src/kyu_3/mod.rs:85:4
[INFO] [stderr]    |
[INFO] [stderr] 85 | fn spiralize(size: usize) -> Vec<Vec<i8>> {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `range_extraction`
[INFO] [stderr]   --> src/kyu_4/mod.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn range_extraction(a: &[i32]) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `acc_to_string`
[INFO] [stderr]   --> src/kyu_4/mod.rs:33:4
[INFO] [stderr]    |
[INFO] [stderr] 33 | fn acc_to_string(acc: &[i32]) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dbl_linear`
[INFO] [stderr]   --> src/kyu_4/mod.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn dbl_linear(n: u32) -> u32 {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `n_linear`
[INFO] [stderr]   --> src/kyu_4/mod.rs:75:4
[INFO] [stderr]    |
[INFO] [stderr] 75 | fn n_linear(m: &[u32], n: usize) -> u32 {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `strings_mix`
[INFO] [stderr]   --> src/kyu_4/mod.rs:96:4
[INFO] [stderr]    |
[INFO] [stderr] 96 | fn strings_mix(s1: &str, s2: &str) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `count_and_filter_chars`
[INFO] [stderr]    --> src/kyu_4/mod.rs:138:4
[INFO] [stderr]     |
[INFO] [stderr] 138 | fn count_and_filter_chars(s: &str) -> HashMap<char, usize> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `int_part`
[INFO] [stderr]    --> src/kyu_4/mod.rs:150:4
[INFO] [stderr]     |
[INFO] [stderr] 150 | fn int_part(n: u32) -> String {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/kyu_4/mod.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |     pub fn new(n: u32) -> PartitionIter {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Cons`
[INFO] [stderr]    --> src/kyu_4/mod.rs:230:5
[INFO] [stderr]     |
[INFO] [stderr] 230 |     Cons(T, Box<Cons<T>>),
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Null`
[INFO] [stderr]    --> src/kyu_4/mod.rs:231:5
[INFO] [stderr]     |
[INFO] [stderr] 231 |     Null
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/kyu_4/mod.rs:235:5
[INFO] [stderr]     |
[INFO] [stderr] 235 |     pub fn new(head: T, tail: Self) -> Self {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_vec`
[INFO] [stderr]    --> src/kyu_4/mod.rs:241:5
[INFO] [stderr]     |
[INFO] [stderr] 241 |     pub fn to_vec(&self) -> Vec<T> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `from_iter`
[INFO] [stderr]    --> src/kyu_4/mod.rs:254:5
[INFO] [stderr]     |
[INFO] [stderr] 254 | /     pub fn from_iter<I>(it: I) -> Self
[INFO] [stderr] 255 | |         where I: IntoIterator<Item=T> {
[INFO] [stderr] 256 | |
[INFO] [stderr] 257 | |         let mut it = it.into_iter();
[INFO] [stderr] ...   |
[INFO] [stderr] 261 | |         }
[INFO] [stderr] 262 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `filter`
[INFO] [stderr]    --> src/kyu_4/mod.rs:264:5
[INFO] [stderr]     |
[INFO] [stderr] 264 | /     pub fn filter<F>(&self, fun: F) -> Self
[INFO] [stderr] 265 | |         where F: Fn(&T) -> bool {
[INFO] [stderr] 266 | |         match self {
[INFO] [stderr] 267 | |             &Cons::Null => Cons::Null,
[INFO] [stderr] ...   |
[INFO] [stderr] 273 | |         }
[INFO] [stderr] 274 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `map`
[INFO] [stderr]    --> src/kyu_4/mod.rs:276:5
[INFO] [stderr]     |
[INFO] [stderr] 276 | /     pub fn map<F,S>(&self, fun: F) -> Cons<S>
[INFO] [stderr] 277 | |         where F: Fn(T) -> S, S: Clone {
[INFO] [stderr] 278 | |         match self {
[INFO] [stderr] 279 | |             &Cons::Null => Cons::Null,
[INFO] [stderr] ...   |
[INFO] [stderr] 282 | |         }
[INFO] [stderr] 283 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `recover_secret`
[INFO] [stderr]    --> src/kyu_4/mod.rs:288:4
[INFO] [stderr]     |
[INFO] [stderr] 288 | fn recover_secret(mut triplets: Vec<[char; 3]>) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `char_does_follow_another`
[INFO] [stderr]    --> src/kyu_4/mod.rs:308:4
[INFO] [stderr]     |
[INFO] [stderr] 308 | fn char_does_follow_another(ch: &char, triplets: &[[char; 3]]) -> bool {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `remove_char_from_beginning`
[INFO] [stderr]    --> src/kyu_4/mod.rs:318:4
[INFO] [stderr]     |
[INFO] [stderr] 318 | fn remove_char_from_beginning(ch: &char, triplets: &mut [[char; 3]]) {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `MorseDecoder`
[INFO] [stderr]    --> src/kyu_4/mod.rs:330:12
[INFO] [stderr]     |
[INFO] [stderr] 330 | pub struct MorseDecoder {
[INFO] [stderr]     |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/kyu_4/mod.rs:335:5
[INFO] [stderr]     |
[INFO] [stderr] 335 |     pub fn new() -> MorseDecoder {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `decode_morse`
[INFO] [stderr]    --> src/kyu_4/mod.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     pub fn decode_morse(&self, encoded: &str) -> String {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `decode_bits`
[INFO] [stderr]    --> src/kyu_4/mod.rs:361:5
[INFO] [stderr]     |
[INFO] [stderr] 361 |     pub fn decode_bits(&self, encoded: &str) -> String {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `calc_sampling_rate`
[INFO] [stderr]    --> src/kyu_4/mod.rs:401:5
[INFO] [stderr]     |
[INFO] [stderr] 401 |     fn calc_sampling_rate(encoded: &str) -> usize {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `next_bigger_number`
[INFO] [stderr]    --> src/kyu_4/mod.rs:433:4
[INFO] [stderr]     |
[INFO] [stderr] 433 | fn next_bigger_number(n: i64) -> i64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs`
[INFO] [stderr]   --> src/kyu_5/mod.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn sum_pairs(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_naive`
[INFO] [stderr]   --> src/kyu_5/mod.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn sum_pairs_naive(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_slow`
[INFO] [stderr]   --> src/kyu_5/mod.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn sum_pairs_slow(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `prime_gap`
[INFO] [stderr]   --> src/kyu_5/mod.rs:60:4
[INFO] [stderr]    |
[INFO] [stderr] 60 | fn prime_gap(g: i32, m: u64, n: u64) -> Option<(u64, u64)> {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `product_fib`
[INFO] [stderr]   --> src/kyu_5/mod.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn product_fib(prod: u64) -> (u64, u64, bool) {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_prime_factors`
[INFO] [stderr]   --> src/kyu_5/mod.rs:94:4
[INFO] [stderr]    |
[INFO] [stderr] 94 | fn get_prime_factors(n: &u64) -> Vec<u64> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_primes`
[INFO] [stderr]    --> src/kyu_5/mod.rs:132:4
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn get_primes(start: u64, end: u64) -> Vec<u64> {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_kprimes`
[INFO] [stderr]    --> src/kyu_5/mod.rs:142:4
[INFO] [stderr]     |
[INFO] [stderr] 142 | fn get_kprimes(k: usize, start: u64, end: u64) -> Vec<u64> {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `puzzle`
[INFO] [stderr]    --> src/kyu_5/mod.rs:153:4
[INFO] [stderr]     |
[INFO] [stderr] 153 | fn puzzle(s: u64) -> u8 {
[INFO] [stderr]     |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `last_digit`
[INFO] [stderr]    --> src/kyu_5/mod.rs:168:4
[INFO] [stderr]     |
[INFO] [stderr] 168 | fn last_digit(str1: &str, str2: &str) -> u8 {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `buddy_numbers`
[INFO] [stderr]    --> src/kyu_5/mod.rs:189:4
[INFO] [stderr]     |
[INFO] [stderr] 189 | fn buddy_numbers(start: u64, limit: u64) -> Option<(u64, u64)> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sum_of_factors`
[INFO] [stderr]    --> src/kyu_5/mod.rs:208:4
[INFO] [stderr]     |
[INFO] [stderr] 208 | fn get_sum_of_factors(n: &u64) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sum_of_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:232:4
[INFO] [stderr]     |
[INFO] [stderr] 232 | fn get_sum_of_factors_slow(n: &u64) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:242:4
[INFO] [stderr]     |
[INFO] [stderr] 242 | fn get_factors_slow(n: &u64) -> Vec<u64> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `find_x_of_pseries`
[INFO] [stderr]    --> src/kyu_5/mod.rs:254:4
[INFO] [stderr]     |
[INFO] [stderr] 254 | fn find_x_of_pseries(m: f64) -> f64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_of_series`
[INFO] [stderr]    --> src/kyu_5/mod.rs:259:4
[INFO] [stderr]     |
[INFO] [stderr] 259 | fn sum_of_series(n: i32) -> f64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `phone_directory`
[INFO] [stderr]    --> src/kyu_5/mod.rs:272:4
[INFO] [stderr]     |
[INFO] [stderr] 272 | fn phone_directory(dir: &str, num: &str) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `consec_kprimes`
[INFO] [stderr]    --> src/kyu_5/mod.rs:325:4
[INFO] [stderr]     |
[INFO] [stderr] 325 | fn consec_kprimes(k: usize, arr: Vec<u64>) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `factorial_decomp`
[INFO] [stderr]    --> src/kyu_5/mod.rs:344:4
[INFO] [stderr]     |
[INFO] [stderr] 344 | fn factorial_decomp(n: u64) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `prime_factors`
[INFO] [stderr]    --> src/kyu_5/mod.rs:375:4
[INFO] [stderr]     |
[INFO] [stderr] 375 | fn prime_factors(n: u64) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `rgb`
[INFO] [stderr]    --> src/kyu_5/mod.rs:406:4
[INFO] [stderr]     |
[INFO] [stderr] 406 | fn rgb(r: i32, g: i32, b: i32) -> String {
[INFO] [stderr]     |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `convert_to_byte`
[INFO] [stderr]    --> src/kyu_5/mod.rs:413:4
[INFO] [stderr]     |
[INFO] [stderr] 413 | fn convert_to_byte(c: i32) -> u8 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `perimeter`
[INFO] [stderr]    --> src/kyu_5/mod.rs:418:4
[INFO] [stderr]     |
[INFO] [stderr] 418 | fn perimeter(n: u64) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `john`
[INFO] [stderr]    --> src/kyu_5/mod.rs:432:4
[INFO] [stderr]     |
[INFO] [stderr] 432 | fn john(n: u32) -> Vec<u32> {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ann`
[INFO] [stderr]    --> src/kyu_5/mod.rs:436:4
[INFO] [stderr]     |
[INFO] [stderr] 436 | fn ann(n: u32) -> Vec<u32> {
[INFO] [stderr]     |    ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_john`
[INFO] [stderr]    --> src/kyu_5/mod.rs:440:4
[INFO] [stderr]     |
[INFO] [stderr] 440 | fn sum_john(n: u32) -> u32 {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_ann`
[INFO] [stderr]    --> src/kyu_5/mod.rs:444:4
[INFO] [stderr]     |
[INFO] [stderr] 444 | fn sum_ann(n: u32) -> u32 {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `john_ann`
[INFO] [stderr]    --> src/kyu_5/mod.rs:448:4
[INFO] [stderr]     |
[INFO] [stderr] 448 | fn john_ann(n: &u32) -> (Vec<u32>, Vec<u32>) {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `convert_fracts`
[INFO] [stderr]    --> src/kyu_5/mod.rs:459:4
[INFO] [stderr]     |
[INFO] [stderr] 459 | fn convert_fracts(mut list: Vec<(u64, u64)>) -> Vec<(u64, u64)> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_prime_factors_with_power`
[INFO] [stderr]    --> src/kyu_5/mod.rs:489:4
[INFO] [stderr]     |
[INFO] [stderr] 489 | fn get_prime_factors_with_power(n: &u64) -> HashMap<u64, u32> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `order_weight`
[INFO] [stderr]    --> src/kyu_5/mod.rs:512:4
[INFO] [stderr]     |
[INFO] [stderr] 512 | fn order_weight(s: &str) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated const is never used: `EPS`
[INFO] [stderr]    --> src/kyu_5/mod.rs:532:5
[INFO] [stderr]     |
[INFO] [stderr] 532 |     const EPS: f64 = 0.001;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_i`
[INFO] [stderr]    --> src/kyu_5/mod.rs:534:5
[INFO] [stderr]     |
[INFO] [stderr] 534 |     pub fn get_i() -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_j`
[INFO] [stderr]    --> src/kyu_5/mod.rs:538:5
[INFO] [stderr]     |
[INFO] [stderr] 538 |     pub fn get_j() -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_k`
[INFO] [stderr]    --> src/kyu_5/mod.rs:542:5
[INFO] [stderr]     |
[INFO] [stderr] 542 |     pub fn get_k() -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/kyu_5/mod.rs:546:5
[INFO] [stderr]     |
[INFO] [stderr] 546 |     pub fn new(i: f64, j: f64, k: f64) -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_magnitude`
[INFO] [stderr]    --> src/kyu_5/mod.rs:550:5
[INFO] [stderr]     |
[INFO] [stderr] 550 |     pub fn get_magnitude(&self) -> f64 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `add`
[INFO] [stderr]    --> src/kyu_5/mod.rs:554:5
[INFO] [stderr]     |
[INFO] [stderr] 554 |     pub fn add(&self, another: Vector) -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `multiply_by_scalar`
[INFO] [stderr]    --> src/kyu_5/mod.rs:558:5
[INFO] [stderr]     |
[INFO] [stderr] 558 |     pub fn multiply_by_scalar(&self, multiplier: f64) -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `dot`
[INFO] [stderr]    --> src/kyu_5/mod.rs:562:5
[INFO] [stderr]     |
[INFO] [stderr] 562 |     pub fn dot(&self, another: Vector) -> f64 {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `cross`
[INFO] [stderr]    --> src/kyu_5/mod.rs:566:5
[INFO] [stderr]     |
[INFO] [stderr] 566 |     pub fn cross(&self, another: Vector) -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_parallel_to`
[INFO] [stderr]    --> src/kyu_5/mod.rs:574:5
[INFO] [stderr]     |
[INFO] [stderr] 574 |     pub fn is_parallel_to(&self, another: Vector) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_perpendicular_to`
[INFO] [stderr]    --> src/kyu_5/mod.rs:597:5
[INFO] [stderr]     |
[INFO] [stderr] 597 |     pub fn is_perpendicular_to(&self, another: Vector) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `normalize`
[INFO] [stderr]    --> src/kyu_5/mod.rs:604:5
[INFO] [stderr]     |
[INFO] [stderr] 604 |     pub fn normalize(&self) -> Vector {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_normalized`
[INFO] [stderr]    --> src/kyu_5/mod.rs:609:5
[INFO] [stderr]     |
[INFO] [stderr] 609 |     pub fn is_normalized(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_equal`
[INFO] [stderr]    --> src/kyu_5/mod.rs:613:5
[INFO] [stderr]     |
[INFO] [stderr] 613 |     fn is_equal(&self, another: Vector) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_zero`
[INFO] [stderr]    --> src/kyu_5/mod.rs:617:5
[INFO] [stderr]     |
[INFO] [stderr] 617 |     fn is_zero(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dec2_fact_string`
[INFO] [stderr]    --> src/kyu_5/mod.rs:623:8
[INFO] [stderr]     |
[INFO] [stderr] 623 | pub fn dec2_fact_string(mut n: u64) -> String {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fact_string_2dec`
[INFO] [stderr]    --> src/kyu_5/mod.rs:638:4
[INFO] [stderr]     |
[INFO] [stderr] 638 | fn fact_string_2dec(s: String) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_and_substitute`
[INFO] [stderr]    --> src/kyu_5/mod.rs:675:4
[INFO] [stderr]     |
[INFO] [stderr] 675 | fn match_and_substitute(s: &str, prog: &str, ver: &str) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `NORTH`
[INFO] [stderr]    --> src/kyu_5/mod.rs:702:5
[INFO] [stderr]     |
[INFO] [stderr] 702 |     NORTH, SOUTH, EAST, WEST
[INFO] [stderr]     |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `SOUTH`
[INFO] [stderr]    --> src/kyu_5/mod.rs:702:12
[INFO] [stderr]     |
[INFO] [stderr] 702 |     NORTH, SOUTH, EAST, WEST
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `EAST`
[INFO] [stderr]    --> src/kyu_5/mod.rs:702:19
[INFO] [stderr]     |
[INFO] [stderr] 702 |     NORTH, SOUTH, EAST, WEST
[INFO] [stderr]     |                   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `WEST`
[INFO] [stderr]    --> src/kyu_5/mod.rs:702:25
[INFO] [stderr]     |
[INFO] [stderr] 702 |     NORTH, SOUTH, EAST, WEST
[INFO] [stderr]     |                         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `dir_reduction`
[INFO] [stderr]    --> src/kyu_5/mod.rs:705:4
[INFO] [stderr]     |
[INFO] [stderr] 705 | fn dir_reduction(arr: &[Direction]) -> Vec<Direction> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `duplicate_encode`
[INFO] [stderr]   --> src/kyu_6/mod.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | fn duplicate_encode(word: &str)->String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `meeting`
[INFO] [stderr]   --> src/kyu_6/mod.rs:32:4
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn meeting(s: &str) -> String {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `longest_consec`
[INFO] [stderr]   --> src/kyu_6/mod.rs:43:4
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn longest_consec(strarr: Vec<&str>, k: usize) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `comp`
[INFO] [stderr]   --> src/kyu_6/mod.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn comp(a: Vec<i64>, b: Vec<i64>) -> bool {
[INFO] [stderr]    |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `backwards_prime`
[INFO] [stderr]   --> src/kyu_6/mod.rs:85:4
[INFO] [stderr]    |
[INFO] [stderr] 85 | fn backwards_prime(start: u64, stop: u64) -> Vec<u64> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reverse`
[INFO] [stderr]   --> src/kyu_6/mod.rs:98:4
[INFO] [stderr]    |
[INFO] [stderr] 98 | fn reverse(n: &u64) -> u64 {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `travel`
[INFO] [stderr]    --> src/kyu_6/mod.rs:109:4
[INFO] [stderr]     |
[INFO] [stderr] 109 | fn travel(text: &str, zip_code: &str) -> String {
[INFO] [stderr]     |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Address`
[INFO] [stderr]    --> src/kyu_6/mod.rs:130:8
[INFO] [stderr]     |
[INFO] [stderr] 130 | struct Address<'a> {
[INFO] [stderr]     |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `good_vs_evil`
[INFO] [stderr]    --> src/kyu_6/mod.rs:137:4
[INFO] [stderr]     |
[INFO] [stderr] 137 | fn good_vs_evil(good: &str, evil: &str) -> String {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `calc_worth_sum`
[INFO] [stderr]    --> src/kyu_6/mod.rs:150:4
[INFO] [stderr]     |
[INFO] [stderr] 150 | fn calc_worth_sum(races_worth: &[u32], army: &str) -> u32 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fp_approx`
[INFO] [stderr]    --> src/kyu_6/mod.rs:160:4
[INFO] [stderr]     |
[INFO] [stderr] 160 | fn fp_approx(x: f64) -> f64 {
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `deadfish_parse`
[INFO] [stderr]    --> src/kyu_6/mod.rs:166:4
[INFO] [stderr]     |
[INFO] [stderr] 166 | fn deadfish_parse(code: &str) -> Vec<i32> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `array_diff`
[INFO] [stderr]    --> src/kyu_6/mod.rs:182:4
[INFO] [stderr]     |
[INFO] [stderr] 182 | fn array_diff<T: PartialEq>(a: Vec<T>, b: Vec<T>) -> Vec<T> {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `max_multiple`
[INFO] [stderr]   --> src/kyu_7/mod.rs:11:4
[INFO] [stderr]    |
[INFO] [stderr] 11 | fn max_multiple(divisor: u32, bound: u32) -> u32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `row_weights`
[INFO] [stderr]   --> src/kyu_7/mod.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn row_weights(array: Vec<u32>) -> (u32, u32) {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `min_value`
[INFO] [stderr]   --> src/kyu_7/mod.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn min_value(mut digits: Vec<i32>) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `passengers_in_bus`
[INFO] [stderr]   --> src/kyu_7/mod.rs:37:4
[INFO] [stderr]    |
[INFO] [stderr] 37 | fn passengers_in_bus(bus_stops:&[(i32, i32)]) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_middle`
[INFO] [stderr]   --> src/kyu_7/mod.rs:42:4
[INFO] [stderr]    |
[INFO] [stderr] 42 | fn get_middle(s: &str) -> &str {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `multiply`
[INFO] [stderr]  --> src/kyu_8/mod.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn multiply(a:i32, b:i32) -> i32 {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `expressions_matter`
[INFO] [stderr]   --> src/kyu_8/mod.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn expressions_matter(a: u64, b: u64, c: u64) -> u64 {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `positive_sum`
[INFO] [stderr]   --> src/kyu_8/mod.rs:16:4
[INFO] [stderr]    |
[INFO] [stderr] 16 | fn positive_sum(arr: &[i32]) -> i32 {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 142 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.69s
[INFO] running `"docker" "inspect" "30c0f44efda7d0726ac1681290720b47453d726fbb23e1c325b62a5dccbdab75"`
[INFO] running `"docker" "rm" "-f" "30c0f44efda7d0726ac1681290720b47453d726fbb23e1c325b62a5dccbdab75"`
[INFO] [stdout] 30c0f44efda7d0726ac1681290720b47453d726fbb23e1c325b62a5dccbdab75
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 33ca2b4c5f8e3541f758744a764fb32c48944241f08ec8c4a8f75e4d5ca1861b
[INFO] running `"docker" "start" "-a" "33ca2b4c5f8e3541f758744a764fb32c48944241f08ec8c4a8f75e4d5ca1861b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling codewars v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `self::Parenthesis::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use self::Parenthesis::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::Operator::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::Operator::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_4/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_5/tests.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |             (actual.abs() <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/kyu_5/tests.rs:100:13
[INFO] [stderr]     |
[INFO] [stderr] 100 |             ((actual - expected).abs() / expected <= merr)
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_6/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_6/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/kyu_6/mod.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                                 ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Match`
[INFO] [stderr]  --> src/kyu_6/mod.rs:5:20
[INFO] [stderr]   |
[INFO] [stderr] 5 | use regex::{Regex, Match};
[INFO] [stderr]   |                    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_6/tests.rs:87:13
[INFO] [stderr]    |
[INFO] [stderr] 87 |             (actual.abs() <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_6/tests.rs:89:13
[INFO] [stderr]    |
[INFO] [stderr] 89 |             ((actual - expected).abs() / expected <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_7/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp::Ordering::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_7/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stderr]  --> src/kyu_7/mod.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/kyu_4/tests.rs:244:13
[INFO] [stderr]     |
[INFO] [stderr] 244 |         let mut decoded_bits = decoder.decode_bits(case[0]);
[INFO] [stderr]     |             ----^^^^^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/kyu_8/mod.rs:17:25
[INFO] [stderr]    |
[INFO] [stderr] 17 |     arr.iter().fold(0, |mut acc, &n| acc + if n > 0 { n } else { 0 })
[INFO] [stderr]    |                         ----^^^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_opening`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     pub fn is_opening(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_naive`
[INFO] [stderr]   --> src/kyu_5/mod.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn sum_pairs_naive(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_slow`
[INFO] [stderr]   --> src/kyu_5/mod.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn sum_pairs_slow(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sum_of_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:232:4
[INFO] [stderr]     |
[INFO] [stderr] 232 | fn get_sum_of_factors_slow(n: &u64) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:242:4
[INFO] [stderr]     |
[INFO] [stderr] 242 | fn get_factors_slow(n: &u64) -> Vec<u64> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_equal`
[INFO] [stderr]    --> src/kyu_5/mod.rs:613:5
[INFO] [stderr]     |
[INFO] [stderr] 613 |     fn is_equal(&self, another: Vector) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 24 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 6.74s
[INFO] running `"docker" "inspect" "33ca2b4c5f8e3541f758744a764fb32c48944241f08ec8c4a8f75e4d5ca1861b"`
[INFO] running `"docker" "rm" "-f" "33ca2b4c5f8e3541f758744a764fb32c48944241f08ec8c4a8f75e4d5ca1861b"`
[INFO] [stdout] 33ca2b4c5f8e3541f758744a764fb32c48944241f08ec8c4a8f75e4d5ca1861b
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2a4d948b9da480be113962330aacb64ed14b6395d7f148a2f4da8abcf749a790
[INFO] running `"docker" "start" "-a" "2a4d948b9da480be113962330aacb64ed14b6395d7f148a2f4da8abcf749a790"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unused import: `self::Parenthesis::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use self::Parenthesis::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::Operator::*`
[INFO] [stderr]   --> src/kyu_2/calculator.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use self::Operator::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_4/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_5/tests.rs:98:13
[INFO] [stderr]    |
[INFO] [stderr] 98 |             (actual.abs() <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/kyu_5/tests.rs:100:13
[INFO] [stderr]     |
[INFO] [stderr] 100 |             ((actual - expected).abs() / expected <= merr)
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_6/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_6/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `HashSet`
[INFO] [stderr]  --> src/kyu_6/mod.rs:4:33
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                                 ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Match`
[INFO] [stderr]  --> src/kyu_6/mod.rs:5:20
[INFO] [stderr]   |
[INFO] [stderr] 5 | use regex::{Regex, Match};
[INFO] [stderr]   |                    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_6/tests.rs:87:13
[INFO] [stderr]    |
[INFO] [stderr] 87 |             (actual.abs() <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/kyu_6/tests.rs:89:13
[INFO] [stderr]    |
[INFO] [stderr] 89 |             ((actual - expected).abs() / expected <= merr)
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp`
[INFO] [stderr]  --> src/kyu_7/mod.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::Ordering::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::cmp::Ordering::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter`
[INFO] [stderr]  --> src/kyu_7/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::iter;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stderr]  --> src/kyu_7/mod.rs:4:24
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::collections::{HashMap, HashSet};
[INFO] [stderr]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::common::*`
[INFO] [stderr]  --> src/kyu_7/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use super::common::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/kyu_4/tests.rs:244:13
[INFO] [stderr]     |
[INFO] [stderr] 244 |         let mut decoded_bits = decoder.decode_bits(case[0]);
[INFO] [stderr]     |             ----^^^^^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/kyu_8/mod.rs:17:25
[INFO] [stderr]    |
[INFO] [stderr] 17 |     arr.iter().fold(0, |mut acc, &n| acc + if n > 0 { n } else { 0 })
[INFO] [stderr]    |                         ----^^^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_opening`
[INFO] [stderr]    --> src/kyu_2/calculator.rs:145:5
[INFO] [stderr]     |
[INFO] [stderr] 145 |     pub fn is_opening(&self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_naive`
[INFO] [stderr]   --> src/kyu_5/mod.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn sum_pairs_naive(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `sum_pairs_slow`
[INFO] [stderr]   --> src/kyu_5/mod.rs:48:4
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn sum_pairs_slow(numbers: &[i8], s: i8) -> Option<(i8, i8)> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_sum_of_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:232:4
[INFO] [stderr]     |
[INFO] [stderr] 232 | fn get_sum_of_factors_slow(n: &u64) -> u64 {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_factors_slow`
[INFO] [stderr]    --> src/kyu_5/mod.rs:242:4
[INFO] [stderr]     |
[INFO] [stderr] 242 | fn get_factors_slow(n: &u64) -> Vec<u64> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_equal`
[INFO] [stderr]    --> src/kyu_5/mod.rs:613:5
[INFO] [stderr]     |
[INFO] [stderr] 613 |     fn is_equal(&self, another: Vector) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 24 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/codewars-57fbeef7209f5c45
[INFO] [stdout] 
[INFO] [stdout] running 75 tests
[INFO] [stdout] test common::tests::is_prime_tests ... ok
[INFO] [stdout] test kyu_4::tests::dbl_linear_tests ... ok
[INFO] [stdout] test kyu_4::tests::cons_map_test ... ok
[INFO] [stdout] test kyu_4::tests::strings_mix_tests ... ok
[INFO] [stdout] test common::tests::mod_pow_tests ... ok
[INFO] [stdout] test kyu_4::tests::n_linear_pair_tests ... ok
[INFO] [stdout] test kyu_4::tests::cons_create_from_vec_test ... ok
[INFO] [stdout] test kyu_4::tests::cons_filter_test ... ok
[INFO] [stdout] test kyu_4::tests::n_linear_triplet_tests ... ok
[INFO] [stdout] test kyu_4::tests::cans_filter_map_test ... ok
[INFO] [stdout] test kyu_4::tests::next_bigger_number_tests ... ok
[INFO] [stdout] test kyu_4::tests::int_part_tests ... ok
[INFO] [stdout] test kyu_4::tests::range_extraction_tests ... ok
[INFO] [stdout] test kyu_2::tests::calc_tests ... ok
[INFO] [stdout] test kyu_5::tests::ann_tests ... ok
[INFO] [stdout] test kyu_3::tests::last_digit2_tests ... ok
[INFO] [stdout] test kyu_3::tests::spiralize_tests ... ok
[INFO] [stdout] test kyu_5::tests::dir_reduction_tests ... ok
[INFO] [stdout] test kyu_5::tests::fact_string_2dec_tests ... ok
[INFO] [stdout] test kyu_5::tests::find_x_of_pseries_tests ... ok
[INFO] [stdout] test kyu_5::tests::perimeter_tests ... ok
[INFO] [stdout] test kyu_5::tests::order_weight_tests ... ok
[INFO] [stdout] test kyu_4::tests::decode_bits_test ... ok
[INFO] [stdout] test kyu_4::tests::recover_secret_tests ... ok
[INFO] [stdout] test kyu_5::tests::dec2_fact_string_tests ... ok
[INFO] [stdout] test kyu_5::tests::product_fib_tests ... ok
[INFO] [stdout] test kyu_5::tests::john_tests ... ok
[INFO] [stdout] test kyu_5::tests::rgb_tests ... ok
[INFO] [stdout] test kyu_5::tests::prime_gap_tests ... ok
[INFO] [stdout] test kyu_5::tests::last_digit_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::add_test ... ok
[INFO] [stdout] test kyu_5::tests::sum_john_tests ... ok
[INFO] [stdout] test kyu_5::tests::sum_pairs_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::cross_test ... ok
[INFO] [stdout] test kyu_5::tests::consec_kprimes_tests ... ok
[INFO] [stdout] test kyu_5::tests::sum_of_series_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::constructor_test ... ok
[INFO] [stdout] test kyu_5::tests::get_kprimes_tests ... ok
[INFO] [stdout] test kyu_5::tests::sum_ann_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::dot_test ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::parallel_test ... ok
[INFO] [stdout] test kyu_5::tests::get_prime_factors_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::multiply_test ... ok
[INFO] [stdout] test kyu_5::tests::get_prime_factors_with_power_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::is_normalized_test ... ok
[INFO] [stdout] test kyu_6::tests::comp_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::get_magnitude_test ... ok
[INFO] [stdout] test kyu_5::tests::prime_factors_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::perpendicular_test ... ok
[INFO] [stdout] test kyu_5::tests::factorial_decomp_tests ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::normalize_test ... ok
[INFO] [stdout] test kyu_5::tests::vector_tests::struct_methods_test ... ok
[INFO] [stdout] test kyu_6::tests::fp_approx_tests ... ok
[INFO] [stdout] test kyu_6::tests::good_vs_evil_tests ... ok
[INFO] [stdout] test kyu_6::tests::array_diff_test ... ok
[INFO] [stdout] test kyu_6::tests::deadfish_parse_test ... ok
[INFO] [stdout] test kyu_6::tests::duplicate_encode_tests ... ok
[INFO] [stdout] test kyu_6::tests::decode_morse_test ... ok
[INFO] [stdout] test kyu_7::tests::min_value_tests ... ok
[INFO] [stdout] test kyu_6::tests::meeting_tests ... ok
[INFO] [stdout] test kyu_7::tests::get_middle_tests ... ok
[INFO] [stdout] test kyu_5::tests::test_add ... ok
[INFO] [stdout] test kyu_5::tests::puzzle_tests ... ok
[INFO] [stdout] test kyu_8::tests::expressions_matter_tests ... ok
[INFO] [stdout] test kyu_7::tests::row_weights_tests ... ok
[INFO] [stdout] test kyu_8::tests::multiply_test ... ok
[INFO] [stdout] test kyu_8::tests::positive_sum_tests ... ok
[INFO] [stdout] test kyu_7::tests::max_multiple_tests ... ok
[INFO] [stdout] test kyu_6::tests::longest_consec_tests ... ok
[INFO] [stdout] test kyu_7::tests::passengers_in_bus_tests ... ok
[INFO] [stdout] test kyu_6::tests::backwards_prime_tests ... ok
[INFO] [stdout] test kyu_5::tests::match_and_substitute_tests ... ok
[INFO] [stdout] test kyu_6::tests::travel_tests ... ok
[INFO] [stdout] test kyu_5::tests::buddy_numbers_tests ... ok
[INFO] [stdout] test kyu_5::tests::phone_directory_tests ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 75 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2a4d948b9da480be113962330aacb64ed14b6395d7f148a2f4da8abcf749a790"`
[INFO] running `"docker" "rm" "-f" "2a4d948b9da480be113962330aacb64ed14b6395d7f148a2f4da8abcf749a790"`
[INFO] [stdout] 2a4d948b9da480be113962330aacb64ed14b6395d7f148a2f4da8abcf749a790