[INFO] cloning repository https://github.com/JosephBARBIERDARNAL/playing-with-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JosephBARBIERDARNAL/playing-with-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJosephBARBIERDARNAL%2Fplaying-with-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJosephBARBIERDARNAL%2Fplaying-with-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6b85bbd045589ce0a8b90fdc0f05e9630cf39dde
[INFO] testing JosephBARBIERDARNAL/playing-with-rust against 1.94.0 for beta-1.95-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJosephBARBIERDARNAL%2Fplaying-with-rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust
[INFO] finished tweaking git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust
[INFO] tweaked toml for git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust on toolchain 1.94.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.94.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust 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" "+1.94.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.94.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ffeb0ddbab0afb861364812a6cfee45121bca3f0fb15ff0f67874e2a1138ed22
[INFO] running `Command { std: "docker" "start" "-a" "ffeb0ddbab0afb861364812a6cfee45121bca3f0fb15ff0f67874e2a1138ed22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffeb0ddbab0afb861364812a6cfee45121bca3f0fb15ff0f67874e2a1138ed22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffeb0ddbab0afb861364812a6cfee45121bca3f0fb15ff0f67874e2a1138ed22", kill_on_drop: false }`
[INFO] [stdout] ffeb0ddbab0afb861364812a6cfee45121bca3f0fb15ff0f67874e2a1138ed22
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.94.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f5495fb511bd8b900f57032c91561918897a65021241790200bdef78dea5b87a
[INFO] running `Command { std: "docker" "start" "-a" "f5495fb511bd8b900f57032c91561918897a65021241790200bdef78dea5b87a", kill_on_drop: false }`
[INFO] [stderr]    Compiling playing-with-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `first_big`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let first_big = numbers.iter().find(|&&x| x > 7);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_big`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_odd`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let has_odd = numbers.iter().any(|&x| x % 2 == 0);
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_odd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `all_positive`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let all_positive = numbers.iter().all(|&x| x > 0);
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_all_positive`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let numbers = vec![1, 2, 3];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let words = vec!["hello", "world"];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn first<T>(slice: &[T]) -> Option<&T> {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:54:16
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn find_max<T>(slice: &[T]) -> Option<&T>
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let numbers = vec![3, 7, 2, 9, 1];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let text = "the quick brown fox jumps over the lazy dog the fox";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let data = vec![("A", 10), ("B", 20), ("A", 30), ("B", 40)];
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let numbers = vec![1, 2, 2, 3, 4, 3, 5, 1, 6];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:66:21
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn group_statistics(data: Vec<(&str, f64)>) -> HashMap<&str, (f64, f64)> {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stats`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let stats = group_statistics(data);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_stats`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `set1`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let set1: HashSet<i32> = vec![1, 2, 3, 4, 5].into_iter().collect();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `set2`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let set2: HashSet<i32> = vec![4, 5, 6, 7, 8].into_iter().collect();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `records`
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:103:16
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stdout]     |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `records`
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let records = vec![
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let score = 85;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `point1`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let point1 = (0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `point2`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let point2 = (3, 4);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let person = Person {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_person`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let data = DataPoint::Series(vec![1.0, 2.0, 3.0]);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let result: Result<i32, String> = Ok(42);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let numbers = vec![1, 2, 3];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stack`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     let age = 25;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:132:19
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stdout]     |                   ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let text = String::from("Context data");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex02_borrowing_references/mod.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn challenge_4() {
[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 `calculate_average` is never used
[INFO] [stdout]   --> exercises/ex02_borrowing_references/mod.rs:65:4
[INFO] [stdout]    |
[INFO] [stdout] 65 | fn calculate_average(v: &Vec<i32>) -> f64 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex03_error_handling/mod.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calculate_mean` is never used
[INFO] [stdout]   --> exercises/ex03_error_handling/mod.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn calculate_mean(numbers: &Vec<i32>) -> Option<f64> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_data` is never used
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn process_data(data: &Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `apply_to_vec` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn apply_to_vec<F>(data: &Vec<i32>, operation: F) -> Vec<i32>
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `make_multiplier` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn make_multiplier(factor: i32) -> impl Fn(i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn challenge_6() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dataset` is never constructed
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Dataset {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Comparable` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:62:7
[INFO] [stdout]    |
[INFO] [stdout] 62 | trait Comparable {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Reportable` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 | trait Reportable {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Experiment` is never constructed
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | struct Experiment {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first` is never used
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn first<T>(slice: &[T]) -> Option<&T> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_max` is never used
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn find_max<T>(slice: &[T]) -> Option<&T>
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Container` is never constructed
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Container<T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `group_statistics` is never used
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn group_statistics(data: Vec<(&str, f64)>) -> HashMap<&str, (f64, f64)> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn challenge_6() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Record` is never constructed
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 | struct Record {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_index` is never used
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_7` is never used
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn challenge_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `age`, and `city` are never read
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct Person {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 46 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 47 |     age: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 48 |     city: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 73 |     Series(Vec<f64>),
[INFO] [stdout]    |     ------ ^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 73 -     Series(Vec<f64>),
[INFO] [stdout] 73 +     Series(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Empty`, `Single`, and `Pair` are never constructed
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 69 | enum DataPoint {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 70 |     Empty,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 71 |     Single(f64),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 72 |     Pair(f64, f64),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:106:4
[INFO] [stdout]     |
[INFO] [stdout] 106 | fn challenge_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_7` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn challenge_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_result` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:132:4
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_8` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:141:4
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn challenge_8() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | struct Context<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:94:4
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]    --> exercises/ex10_lifetimes/mod.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn challenge_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `Command { std: "docker" "inspect" "f5495fb511bd8b900f57032c91561918897a65021241790200bdef78dea5b87a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5495fb511bd8b900f57032c91561918897a65021241790200bdef78dea5b87a", kill_on_drop: false }`
[INFO] [stdout] f5495fb511bd8b900f57032c91561918897a65021241790200bdef78dea5b87a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.94.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0c810f63d45ce4e38fd227c8ecceefe82450d8ec3659ee3a02eba72f186ae9aa
[INFO] running `Command { std: "docker" "start" "-a" "0c810f63d45ce4e38fd227c8ecceefe82450d8ec3659ee3a02eba72f186ae9aa", kill_on_drop: false }`
[INFO] [stderr]    Compiling playing-with-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:97:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |     use super::*;
[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: `super::*`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:151:9
[INFO] [stdout]     |
[INFO] [stdout] 151 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]    --> exercises/ex10_lifetimes/mod.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     use super::*;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first_big`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:63:9
[INFO] [stdout]    |
[INFO] [stdout] 63 |     let first_big = numbers.iter().find(|&&x| x > 7);
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_big`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `has_odd`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let has_odd = numbers.iter().any(|&x| x % 2 == 0);
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_odd`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `all_positive`
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:69:9
[INFO] [stdout]    |
[INFO] [stdout] 69 |     let all_positive = numbers.iter().all(|&x| x > 0);
[INFO] [stdout]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_all_positive`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let numbers = vec![1, 2, 3];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `words`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let words = vec!["hello", "world"];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:25:13
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn first<T>(slice: &[T]) -> Option<&T> {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:54:16
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn find_max<T>(slice: &[T]) -> Option<&T>
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:65:9
[INFO] [stdout]    |
[INFO] [stdout] 65 |     let numbers = vec![3, 7, 2, 9, 1];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let text = "the quick brown fox jumps over the lazy dog the fox";
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:46:9
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let data = vec![("A", 10), ("B", 20), ("A", 30), ("B", 40)];
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |     let numbers = vec![1, 2, 2, 3, 4, 3, 5, 1, 6];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:66:21
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn group_statistics(data: Vec<(&str, f64)>) -> HashMap<&str, (f64, f64)> {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stats`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 75 |     let stats = group_statistics(data);
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_stats`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `set1`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let set1: HashSet<i32> = vec![1, 2, 3, 4, 5].into_iter().collect();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `set2`
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:87:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let set2: HashSet<i32> = vec![4, 5, 6, 7, 8].into_iter().collect();
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `records`
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:103:16
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stdout]     |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `records`
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:109:9
[INFO] [stdout]     |
[INFO] [stdout] 109 |     let records = vec![
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `score`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let score = 85;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `point1`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     let point1 = (0, 0);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `point2`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let point2 = (3, 4);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `person`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:53:9
[INFO] [stdout]    |
[INFO] [stdout] 53 |     let person = Person {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_person`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let data = DataPoint::Series(vec![1.0, 2.0, 3.0]);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:93:9
[INFO] [stdout]    |
[INFO] [stdout] 93 |     let result: Result<i32, String> = Ok(42);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `numbers`
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:99:9
[INFO] [stdout]    |
[INFO] [stdout] 99 |     let numbers = vec![1, 2, 3];
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stdout]     |         ----^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stack`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `age`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |     let age = 25;
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:132:19
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stdout]     |                   ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |     let text = String::from("Context data");
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex02_borrowing_references/mod.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn challenge_4() {
[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 `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex03_error_handling/mod.rs:74:4
[INFO] [stdout]    |
[INFO] [stdout] 74 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex04_iterators/mod.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]   --> exercises/ex05_closures/mod.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn challenge_6() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dataset` is never constructed
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | struct Dataset {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Comparable` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:62:7
[INFO] [stdout]    |
[INFO] [stdout] 62 | trait Comparable {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Reportable` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:72:7
[INFO] [stdout]    |
[INFO] [stdout] 72 | trait Reportable {
[INFO] [stdout]    |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Experiment` is never constructed
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | struct Experiment {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex06_traits/mod.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Container` is never constructed
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | struct Container<T> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex07_generics/mod.rs:90:4
[INFO] [stdout]    |
[INFO] [stdout] 90 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn challenge_6() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Record` is never constructed
[INFO] [stdout]   --> exercises/ex08_collections/mod.rs:97:8
[INFO] [stdout]    |
[INFO] [stdout] 97 | struct Record {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_index` is never used
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:103:4
[INFO] [stdout]     |
[INFO] [stdout] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_7` is never used
[INFO] [stdout]    --> exercises/ex08_collections/mod.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn challenge_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name`, `age`, and `city` are never read
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | struct Person {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 46 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 47 |     age: u32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 48 |     city: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:73:12
[INFO] [stdout]    |
[INFO] [stdout] 73 |     Series(Vec<f64>),
[INFO] [stdout]    |     ------ ^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 73 -     Series(Vec<f64>),
[INFO] [stdout] 73 +     Series(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Empty`, `Single`, and `Pair` are never constructed
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:70:5
[INFO] [stdout]    |
[INFO] [stdout] 69 | enum DataPoint {
[INFO] [stdout]    |      --------- variants in this enum
[INFO] [stdout] 70 |     Empty,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 71 |     Single(f64),
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 72 |     Pair(f64, f64),
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex09_pattern_matching/mod.rs:91:4
[INFO] [stdout]    |
[INFO] [stdout] 91 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:106:4
[INFO] [stdout]     |
[INFO] [stdout] 106 | fn challenge_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_7` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn challenge_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_result` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:132:4
[INFO] [stdout]     |
[INFO] [stdout] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_8` is never used
[INFO] [stdout]    --> exercises/ex09_pattern_matching/mod.rs:141:4
[INFO] [stdout]     |
[INFO] [stdout] 141 | fn challenge_8() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_4` is never used
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn challenge_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Context` is never constructed
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:82:8
[INFO] [stdout]    |
[INFO] [stdout] 82 | struct Context<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_5` is never used
[INFO] [stdout]   --> exercises/ex10_lifetimes/mod.rs:94:4
[INFO] [stdout]    |
[INFO] [stdout] 94 | fn challenge_5() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `challenge_6` is never used
[INFO] [stdout]    --> exercises/ex10_lifetimes/mod.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn challenge_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `Command { std: "docker" "inspect" "0c810f63d45ce4e38fd227c8ecceefe82450d8ec3659ee3a02eba72f186ae9aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0c810f63d45ce4e38fd227c8ecceefe82450d8ec3659ee3a02eba72f186ae9aa", kill_on_drop: false }`
[INFO] [stdout] 0c810f63d45ce4e38fd227c8ecceefe82450d8ec3659ee3a02eba72f186ae9aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.94.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b06a27fce4b26b1499c8f26debc7c8d38b643f3bc9a42a8e01f49ae1bf8979d5
[INFO] running `Command { std: "docker" "start" "-a" "b06a27fce4b26b1499c8f26debc7c8d38b643f3bc9a42a8e01f49ae1bf8979d5", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:97:9
[INFO] [stderr]    |
[INFO] [stderr] 97 |     use super::*;
[INFO] [stdout] 
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stdout] running 17 tests
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:151:9
[INFO] [stderr]     |
[INFO] [stderr] 151 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> exercises/ex10_lifetimes/mod.rs:123:9
[INFO] [stderr]     |
[INFO] [stderr] 123 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `first_big`
[INFO] [stderr]   --> exercises/ex04_iterators/mod.rs:63:9
[INFO] [stderr]    |
[INFO] [stderr] 63 |     let first_big = numbers.iter().find(|&&x| x > 7);
[INFO] [stderr]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_big`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `has_odd`
[INFO] [stderr]   --> exercises/ex04_iterators/mod.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |     let has_odd = numbers.iter().any(|&x| x % 2 == 0);
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_has_odd`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `all_positive`
[INFO] [stderr]   --> exercises/ex04_iterators/mod.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |     let all_positive = numbers.iter().all(|&x| x > 0);
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_all_positive`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `numbers`
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let numbers = vec![1, 2, 3];
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `words`
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |     let words = vec!["hello", "world"];
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_words`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn first<T>(slice: &[T]) -> Option<&T> {
[INFO] [stderr]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `slice`
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:54:16
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn find_max<T>(slice: &[T]) -> Option<&T>
[INFO] [stderr]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `numbers`
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |     let numbers = vec![3, 7, 2, 9, 1];
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `text`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |     let text = "the quick brown fox jumps over the lazy dog the fox";
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `data`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let data = vec![("A", 10), ("B", 20), ("A", 30), ("B", 40)];
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `numbers`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let numbers = vec![1, 2, 2, 3, 4, 3, 5, 1, 6];
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `data`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn group_statistics(data: Vec<(&str, f64)>) -> HashMap<&str, (f64, f64)> {
[INFO] [stderr]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stats`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let stats = group_statistics(data);
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_stats`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `set1`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:86:9
[INFO] [stderr]    |
[INFO] [stderr] 86 |     let set1: HashSet<i32> = vec![1, 2, 3, 4, 5].into_iter().collect();
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `set2`
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:87:9
[INFO] [stderr]    |
[INFO] [stderr] 87 |     let set2: HashSet<i32> = vec![4, 5, 6, 7, 8].into_iter().collect();
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_set2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `records`
[INFO] [stderr]    --> exercises/ex08_collections/mod.rs:103:16
[INFO] [stderr]     |
[INFO] [stderr] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stderr]     |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `records`
[INFO] [stderr]    --> exercises/ex08_collections/mod.rs:109:9
[INFO] [stderr]     |
[INFO] [stderr] 109 |     let records = vec![
[INFO] [stderr]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_records`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `score`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let score = 85;
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_score`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `point1`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:32:9
[INFO] [stderr]    |
[INFO] [stderr] 32 |     let point1 = (0, 0);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `point2`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |     let point2 = (3, 4);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_point2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `person`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |     let person = Person {
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_person`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `data`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let data = DataPoint::Series(vec![1.0, 2.0, 3.0]);
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_data`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:93:9
[INFO] [stderr]    |
[INFO] [stderr] 93 |     let result: Result<i32, String> = Ok(42);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `numbers`
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |     let numbers = vec![1, 2, 3];
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_numbers`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `stack`
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let mut stack = vec![1, 2, 3, 4, 5];
[INFO] [stderr]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_stack`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `age`
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:121:9
[INFO] [stderr]     |
[INFO] [stderr] 121 |     let age = 25;
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_age`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:132:19
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stderr]     |                   ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `text`
[INFO] [stderr]   --> exercises/ex10_lifetimes/mod.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |     let text = String::from("Context data");
[INFO] [stderr]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_4` is never used
[INFO] [stderr]   --> exercises/ex02_borrowing_references/mod.rs:55:4
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn challenge_4() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_4` is never used
[INFO] [stderr]   --> exercises/ex03_error_handling/mod.rs:74:4
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn challenge_4() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex04_iterators/mod.rs:73:4
[INFO] [stderr]    |
[INFO] [stderr] 73 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex05_closures/mod.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_6` is never used
[INFO] [stderr]   --> exercises/ex05_closures/mod.rs:95:4
[INFO] [stderr]    |
[INFO] [stderr] 95 | fn challenge_6() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Dataset` is never constructed
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | struct Dataset {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Comparable` is never used
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:62:7
[INFO] [stderr]    |
[INFO] [stderr] 62 | trait Comparable {
[INFO] [stderr]    |       ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Reportable` is never used
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:72:7
[INFO] [stderr]    |
[INFO] [stderr] 72 | trait Reportable {
[INFO] [stderr]    |       ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Experiment` is never constructed
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 | struct Experiment {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_4` is never used
[INFO] [stderr]   --> exercises/ex06_traits/mod.rs:90:4
[INFO] [stderr]    |
[INFO] [stderr] 90 | fn challenge_4() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Container` is never constructed
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:73:8
[INFO] [stderr]    |
[INFO] [stderr] 73 | struct Container<T> {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex07_generics/mod.rs:90:4
[INFO] [stderr]    |
[INFO] [stderr] 90 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:73:4
[INFO] [stderr]    |
[INFO] [stderr] 73 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_6` is never used
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:84:4
[INFO] [stderr]    |
[INFO] [stderr] 84 | fn challenge_6() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Record` is never constructed
[INFO] [stderr]   --> exercises/ex08_collections/mod.rs:97:8
[INFO] [stderr]    |
[INFO] [stderr] 97 | struct Record {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `build_index` is never used
[INFO] [stderr]    --> exercises/ex08_collections/mod.rs:103:4
[INFO] [stderr]     |
[INFO] [stderr] 103 | fn build_index(records: Vec<Record>) -> HashMap<i32, Record> {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_7` is never used
[INFO] [stderr]    --> exercises/ex08_collections/mod.rs:108:4
[INFO] [stderr]     |
[INFO] [stderr] 108 | fn challenge_7() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `name`, `age`, and `city` are never read
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 45 | struct Person {
[INFO] [stderr]    |        ------ fields in this struct
[INFO] [stderr] 46 |     name: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 47 |     age: u32,
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 48 |     city: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Person` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:73:12
[INFO] [stderr]    |
[INFO] [stderr] 73 |     Series(Vec<f64>),
[INFO] [stderr]    |     ------ ^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 73 -     Series(Vec<f64>),
[INFO] [stderr] 73 +     Series(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: variants `Empty`, `Single`, and `Pair` are never constructed
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:70:5
[INFO] [stderr]    |
[INFO] [stderr] 69 | enum DataPoint {
[INFO] [stderr]    |      --------- variants in this enum
[INFO] [stderr] 70 |     Empty,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 71 |     Single(f64),
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 72 |     Pair(f64, f64),
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex09_pattern_matching/mod.rs:91:4
[INFO] [stderr]    |
[INFO] [stderr] 91 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_6` is never used
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:106:4
[INFO] [stderr]     |
[INFO] [stderr] 106 | fn challenge_6() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_7` is never used
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:119:4
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn challenge_7() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `process_result` is never used
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:132:4
[INFO] [stderr]     |
[INFO] [stderr] 132 | fn process_result(result: &Result<Vec<i32>, String>) {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_8` is never used
[INFO] [stderr]    --> exercises/ex09_pattern_matching/mod.rs:141:4
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn challenge_8() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_4` is never used
[INFO] [stderr]   --> exercises/ex10_lifetimes/mod.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn challenge_4() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Context` is never constructed
[INFO] [stderr]   --> exercises/ex10_lifetimes/mod.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 | struct Context<'a> {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_5` is never used
[INFO] [stderr]   --> exercises/ex10_lifetimes/mod.rs:94:4
[INFO] [stderr]    |
[INFO] [stderr] 94 | fn challenge_5() {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `challenge_6` is never used
[INFO] [stderr]    --> exercises/ex10_lifetimes/mod.rs:101:4
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn challenge_6() {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `playing-with-rust` (bin "playing-with-rust" test) generated 61 warnings (run `cargo fix --bin "playing-with-rust" -p playing-with-rust --tests` to apply 32 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests main.rs (/opt/rustwide/target/debug/deps/playing_with_rust-44e0da1d07f96d68)
[INFO] [stdout] test exercises::ex03_error_handling::tests::test_mean ... ok
[INFO] [stdout] test exercises::ex03_error_handling::tests::test_find_greater ... ok
[INFO] [stdout] test exercises::ex02_borrowing_references::tests::test_borrowing ... ok
[INFO] [stdout] test exercises::ex03_error_handling::tests::test_parse ... ok
[INFO] [stdout] test exercises::ex03_error_handling::tests::test_safe_divide ... ok
[INFO] [stdout] test exercises::ex04_iterators::tests::test_iterators ... ok
[INFO] [stdout] test exercises::ex04_iterators::tests::test_process_data ... ok
[INFO] [stdout] test exercises::ex05_closures::tests::test_apply_to_vec ... ok
[INFO] [stdout] test exercises::ex05_closures::tests::test_make_multiplier ... ok
[INFO] [stdout] test exercises::ex06_traits::tests::test_traits ... ok
[INFO] [stdout] test exercises::ex01_ownership::tests::test_ownership ... ok
[INFO] [stdout] test exercises::ex09_pattern_matching::tests::test_patterns ... ok
[INFO] [stdout] test exercises::ex10_lifetimes::tests::test_lifetimes ... ok
[INFO] [stdout] test exercises::ex02_borrowing_references::tests::test_average ... ok
[INFO] [stdout] test exercises::ex07_generics::tests::test_find_max ... FAILED
[INFO] [stdout] test exercises::ex08_collections::tests::test_group_statistics ... FAILED
[INFO] [stderr] error: test failed, to rerun pass `--bin playing-with-rust`
[INFO] [stdout] test exercises::ex07_generics::tests::test_first ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- exercises::ex07_generics::tests::test_find_max stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercises::ex07_generics::tests::test_find_max' (29) panicked at exercises/ex07_generics/mod.rs:114:9:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: None
[INFO] [stdout]  right: Some(5)
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x577ca0875882 - std::backtrace_rs::backtrace::libunwind::trace::hff358a60abf734fc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x577ca0875882 - std::backtrace_rs::backtrace::trace_unsynchronized::h3b121f916dd95ec6
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x577ca0875882 - std::sys::backtrace::_print_fmt::hde0a62ded68798e9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x577ca0875882 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h93773fc827e3113d
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x577ca0885eda - core::fmt::rt::Argument::fmt::h01eff69902dad97f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x577ca0885eda - core::fmt::write::hed7b5c73d82ecb7c
[INFO] [stdout]    6:     0x577ca08445c6 - std::io::default_write_fmt::h2f696ff5b8bbaa4b
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x577ca08445c6 - std::io::Write::write_fmt::h5e66814db8a9cfce
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x577ca0854d69 - std::sys::backtrace::BacktraceLock::print::h8b1d6fcc5a56d1a3
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x577ca0854d69 - std::panicking::default_hook::{{closure}}::h2be84df4f189ae36
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x577ca0854c01 - std::panicking::default_hook::hf0ea8939246f43a9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x577ca08192ae - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h02d35e3888986252
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x577ca08192ae - test::test_main_with_exit_callback::{{closure}}::h939640a27d647173
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x577ca0854fe2 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc9df09ff391af3e7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x577ca0854fe2 - std::panicking::panic_with_hook::hb4bd9ac1123582a0
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x577ca0854e28 - std::panicking::panic_handler::{{closure}}::hde00dd15f5637fe2
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x577ca08503b9 - std::sys::backtrace::__rust_end_short_backtrace::hb72197fa777c1785
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x577ca08393fd - __rustc[4425a7e20b4c8619]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x577ca088d33c - core::panicking::panic_fmt::ha59b517dd231f4da
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x577ca088d1f3 - core::panicking::assert_failed_inner::h3c3301979dc81b81
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x577ca07fa02d - core::panicking::assert_failed::h690fa2dadf772a75
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x577ca07f72b8 - playing_with_rust::exercises::ex07_generics::tests::test_find_max::h1dfc5201dcbf0a6f
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:114:9
[INFO] [stdout]   22:     0x577ca07f7337 - playing_with_rust::exercises::ex07_generics::tests::test_find_max::{{closure}}::h301cd6470a5eeb11
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:113:23
[INFO] [stdout]   23:     0x577ca07f42e6 - core::ops::function::FnOnce::call_once::hf4982f63187a6f4a
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x577ca081906b - core::ops::function::FnOnce::call_once::hddb3cd395c36bfbb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x577ca081906b - test::__rust_begin_short_backtrace::h0b6a7601d9750bfa
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x577ca082ca7a - test::run_test_in_process::{{closure}}::h444209903f00b347
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x577ca082ca7a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hfb3ba8f46e537649
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x577ca082ca7a - std::panicking::catch_unwind::do_call::h1672a45911fcf9dc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x577ca082ca7a - std::panicking::catch_unwind::h0fadaee22787a6dd
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x577ca082ca7a - std::panic::catch_unwind::hc47ad190f2c8e188
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x577ca082ca7a - test::run_test_in_process::hcd7faaf934f29999
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x577ca082ca7a - test::run_test::{{closure}}::hddc4550da4871867
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x577ca0806ed4 - test::run_test::{{closure}}::h98ae26689f13ed94
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x577ca0806ed4 - std::sys::backtrace::__rust_begin_short_backtrace::h3ec4d1f21ad44588
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd8bf2c73d479939f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x577ca080a872 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h3b4248f358af2491
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x577ca080a872 - std::panicking::catch_unwind::do_call::hda10a64f4b8daebe
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x577ca080a872 - std::panicking::catch_unwind::h659e5ee8336ec8c7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x577ca080a872 - std::panic::catch_unwind::h9d4d66a538912c18
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h7557906bb51d79f1
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x577ca080a872 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h9e460d1d7fc83d35
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x577ca084b64f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61282da819d64ea9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x577ca084b64f - std::sys::thread::unix::Thread::new::thread_start::h982f9ea829d1b5fb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/thread/unix.rs:127:17
[INFO] [stdout]   44:     0x7e4c81c96aa4 - <unknown>
[INFO] [stdout]   45:     0x7e4c81d23a64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] ---- exercises::ex08_collections::tests::test_group_statistics stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercises::ex08_collections::tests::test_group_statistics' (31) panicked at exercises/ex08_collections/mod.rs:127:9:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: None
[INFO] [stdout]  right: Some((30.0, 2.0))
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x577ca0875882 - std::backtrace_rs::backtrace::libunwind::trace::hff358a60abf734fc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x577ca0875882 - std::backtrace_rs::backtrace::trace_unsynchronized::h3b121f916dd95ec6
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x577ca0875882 - std::sys::backtrace::_print_fmt::hde0a62ded68798e9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x577ca0875882 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h93773fc827e3113d
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x577ca0885eda - core::fmt::rt::Argument::fmt::h01eff69902dad97f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x577ca0885eda - core::fmt::write::hed7b5c73d82ecb7c
[INFO] [stdout]    6:     0x577ca08445c6 - std::io::default_write_fmt::h2f696ff5b8bbaa4b
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x577ca08445c6 - std::io::Write::write_fmt::h5e66814db8a9cfce
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x577ca0854d69 - std::sys::backtrace::BacktraceLock::print::h8b1d6fcc5a56d1a3
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x577ca0854d69 - std::panicking::default_hook::{{closure}}::h2be84df4f189ae36
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x577ca0854c01 - std::panicking::default_hook::hf0ea8939246f43a9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x577ca08192ae - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h02d35e3888986252
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x577ca08192ae - test::test_main_with_exit_callback::{{closure}}::h939640a27d647173
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x577ca0854fe2 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc9df09ff391af3e7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x577ca0854fe2 - std::panicking::panic_with_hook::hb4bd9ac1123582a0
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x577ca0854e28 - std::panicking::panic_handler::{{closure}}::hde00dd15f5637fe2
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x577ca08503b9 - std::sys::backtrace::__rust_end_short_backtrace::hb72197fa777c1785
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x577ca08393fd - __rustc[4425a7e20b4c8619]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x577ca088d33c - core::panicking::panic_fmt::ha59b517dd231f4da
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x577ca088d1f3 - core::panicking::assert_failed_inner::h3c3301979dc81b81
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x577ca07f9fdc - core::panicking::assert_failed::h4b22cedf0f5158d1
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x577ca07f33da - playing_with_rust::exercises::ex08_collections::tests::test_group_statistics::h22b6b593b6d386ee
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex08_collections/mod.rs:127:9
[INFO] [stdout]   22:     0x577ca07f3427 - playing_with_rust::exercises::ex08_collections::tests::test_group_statistics::{{closure}}::h25ea4c71f7f2f048
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex08_collections/mod.rs:124:31
[INFO] [stdout]   23:     0x577ca07f4296 - core::ops::function::FnOnce::call_once::hc2f29ec20f20fc06
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x577ca081906b - core::ops::function::FnOnce::call_once::hddb3cd395c36bfbb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x577ca081906b - test::__rust_begin_short_backtrace::h0b6a7601d9750bfa
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x577ca082ca7a - test::run_test_in_process::{{closure}}::h444209903f00b347
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x577ca082ca7a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hfb3ba8f46e537649
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x577ca082ca7a - std::panicking::catch_unwind::do_call::h1672a45911fcf9dc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x577ca082ca7a - std::panicking::catch_unwind::h0fadaee22787a6dd
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x577ca082ca7a - std::panic::catch_unwind::hc47ad190f2c8e188
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x577ca082ca7a - test::run_test_in_process::hcd7faaf934f29999
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x577ca082ca7a - test::run_test::{{closure}}::hddc4550da4871867
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x577ca0806ed4 - test::run_test::{{closure}}::h98ae26689f13ed94
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x577ca0806ed4 - std::sys::backtrace::__rust_begin_short_backtrace::h3ec4d1f21ad44588
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd8bf2c73d479939f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x577ca080a872 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h3b4248f358af2491
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x577ca080a872 - std::panicking::catch_unwind::do_call::hda10a64f4b8daebe
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x577ca080a872 - std::panicking::catch_unwind::h659e5ee8336ec8c7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x577ca080a872 - std::panic::catch_unwind::h9d4d66a538912c18
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h7557906bb51d79f1
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x577ca080a872 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h9e460d1d7fc83d35
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x577ca084b64f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61282da819d64ea9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x577ca084b64f - std::sys::thread::unix::Thread::new::thread_start::h982f9ea829d1b5fb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/thread/unix.rs:127:17
[INFO] [stdout]   44:     0x7e4c81c96aa4 - <unknown>
[INFO] [stdout]   45:     0x7e4c81d23a64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] ---- exercises::ex07_generics::tests::test_first stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'exercises::ex07_generics::tests::test_first' (30) panicked at exercises/ex07_generics/mod.rs:108:9:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: None
[INFO] [stdout]  right: Some(1)
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x577ca0875882 - std::backtrace_rs::backtrace::libunwind::trace::hff358a60abf734fc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x577ca0875882 - std::backtrace_rs::backtrace::trace_unsynchronized::h3b121f916dd95ec6
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x577ca0875882 - std::sys::backtrace::_print_fmt::hde0a62ded68798e9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x577ca0875882 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h93773fc827e3113d
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x577ca0885eda - core::fmt::rt::Argument::fmt::h01eff69902dad97f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x577ca0885eda - core::fmt::write::hed7b5c73d82ecb7c
[INFO] [stdout]    6:     0x577ca08445c6 - std::io::default_write_fmt::h2f696ff5b8bbaa4b
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x577ca08445c6 - std::io::Write::write_fmt::h5e66814db8a9cfce
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x577ca0854d69 - std::sys::backtrace::BacktraceLock::print::h8b1d6fcc5a56d1a3
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x577ca0854d69 - std::panicking::default_hook::{{closure}}::h2be84df4f189ae36
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x577ca0854c01 - std::panicking::default_hook::hf0ea8939246f43a9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x577ca08192ae - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h02d35e3888986252
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x577ca08192ae - test::test_main_with_exit_callback::{{closure}}::h939640a27d647173
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x577ca0854fe2 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hc9df09ff391af3e7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x577ca0854fe2 - std::panicking::panic_with_hook::hb4bd9ac1123582a0
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x577ca0854e28 - std::panicking::panic_handler::{{closure}}::hde00dd15f5637fe2
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x577ca08503b9 - std::sys::backtrace::__rust_end_short_backtrace::hb72197fa777c1785
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x577ca08393fd - __rustc[4425a7e20b4c8619]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x577ca088d33c - core::panicking::panic_fmt::ha59b517dd231f4da
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x577ca088d1f3 - core::panicking::assert_failed_inner::h3c3301979dc81b81
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x577ca07fa02d - core::panicking::assert_failed::h690fa2dadf772a75
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x577ca07f71b8 - playing_with_rust::exercises::ex07_generics::tests::test_first::hf097cc3b21d04548
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:108:9
[INFO] [stdout]   22:     0x577ca07f7237 - playing_with_rust::exercises::ex07_generics::tests::test_first::{{closure}}::h304fe81f7512824e
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:107:20
[INFO] [stdout]   23:     0x577ca07f4256 - core::ops::function::FnOnce::call_once::hb5384e4d84793a78
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x577ca081906b - core::ops::function::FnOnce::call_once::hddb3cd395c36bfbb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x577ca081906b - test::__rust_begin_short_backtrace::h0b6a7601d9750bfa
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x577ca082ca7a - test::run_test_in_process::{{closure}}::h444209903f00b347
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x577ca082ca7a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hfb3ba8f46e537649
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x577ca082ca7a - std::panicking::catch_unwind::do_call::h1672a45911fcf9dc
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x577ca082ca7a - std::panicking::catch_unwind::h0fadaee22787a6dd
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x577ca082ca7a - std::panic::catch_unwind::hc47ad190f2c8e188
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x577ca082ca7a - test::run_test_in_process::hcd7faaf934f29999
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x577ca082ca7a - test::run_test::{{closure}}::hddc4550da4871867
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x577ca0806ed4 - test::run_test::{{closure}}::h98ae26689f13ed94
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x577ca0806ed4 - std::sys::backtrace::__rust_begin_short_backtrace::h3ec4d1f21ad44588
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd8bf2c73d479939f
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x577ca080a872 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h3b4248f358af2491
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x577ca080a872 - std::panicking::catch_unwind::do_call::hda10a64f4b8daebe
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x577ca080a872 - std::panicking::catch_unwind::h659e5ee8336ec8c7
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x577ca080a872 - std::panic::catch_unwind::h9d4d66a538912c18
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x577ca080a872 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h7557906bb51d79f1
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x577ca080a872 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h9e460d1d7fc83d35
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x577ca084b64f - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h61282da819d64ea9
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x577ca084b64f - std::sys::thread::unix::Thread::new::thread_start::h982f9ea829d1b5fb
[INFO] [stdout]                                at /rustc/4a4ef493e3a1488c6e321570238084b38948f6db/library/std/src/sys/thread/unix.rs:127:17
[INFO] [stdout]   44:     0x7e4c81c96aa4 - <unknown>
[INFO] [stdout]   45:     0x7e4c81d23a64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     exercises::ex07_generics::tests::test_find_max
[INFO] [stdout]     exercises::ex07_generics::tests::test_first
[INFO] [stdout]     exercises::ex08_collections::tests::test_group_statistics
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 14 passed; 3 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "b06a27fce4b26b1499c8f26debc7c8d38b643f3bc9a42a8e01f49ae1bf8979d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b06a27fce4b26b1499c8f26debc7c8d38b643f3bc9a42a8e01f49ae1bf8979d5", kill_on_drop: false }`
[INFO] [stdout] b06a27fce4b26b1499c8f26debc7c8d38b643f3bc9a42a8e01f49ae1bf8979d5
