[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 beta-2026-03-05 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-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/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-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/JosephBARBIERDARNAL/playing-with-rust on toolchain beta-2026-03-05
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-03-05" "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" "+beta-2026-03-05" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-03-05" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3cfe446f7b4da6015a5c59c33bfab438daf939f90f8519467675a90c4137883f
[INFO] running `Command { std: "docker" "start" "-a" "3cfe446f7b4da6015a5c59c33bfab438daf939f90f8519467675a90c4137883f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3cfe446f7b4da6015a5c59c33bfab438daf939f90f8519467675a90c4137883f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cfe446f7b4da6015a5c59c33bfab438daf939f90f8519467675a90c4137883f", kill_on_drop: false }`
[INFO] [stdout] 3cfe446f7b4da6015a5c59c33bfab438daf939f90f8519467675a90c4137883f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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" "+beta-2026-03-05" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4bb4ee4d9a2ad70bf18cdeb248a1a3a671310974ae5c3f56dbc9df84106b01a
[INFO] running `Command { std: "docker" "start" "-a" "e4bb4ee4d9a2ad70bf18cdeb248a1a3a671310974ae5c3f56dbc9df84106b01a", 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 0.63s
[INFO] running `Command { std: "docker" "inspect" "e4bb4ee4d9a2ad70bf18cdeb248a1a3a671310974ae5c3f56dbc9df84106b01a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4bb4ee4d9a2ad70bf18cdeb248a1a3a671310974ae5c3f56dbc9df84106b01a", kill_on_drop: false }`
[INFO] [stdout] e4bb4ee4d9a2ad70bf18cdeb248a1a3a671310974ae5c3f56dbc9df84106b01a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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" "+beta-2026-03-05" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 564881b1b978e52143f1f39ec570174022064d559770e533fe741a780d3acadb
[INFO] running `Command { std: "docker" "start" "-a" "564881b1b978e52143f1f39ec570174022064d559770e533fe741a780d3acadb", 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 0.97s
[INFO] running `Command { std: "docker" "inspect" "564881b1b978e52143f1f39ec570174022064d559770e533fe741a780d3acadb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "564881b1b978e52143f1f39ec570174022064d559770e533fe741a780d3acadb", kill_on_drop: false }`
[INFO] [stdout] 564881b1b978e52143f1f39ec570174022064d559770e533fe741a780d3acadb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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" "+beta-2026-03-05" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1f3aaee94a25cadeb4eb82b9aa6b2d277c23ffb741de2b51c14d5b9c745a4d1a
[INFO] running `Command { std: "docker" "start" "-a" "1f3aaee94a25cadeb4eb82b9aa6b2d277c23ffb741de2b51c14d5b9c745a4d1a", 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] [stderr]    |         ^^^^^^^^
[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 0.09s
[INFO] [stderr]      Running unittests main.rs (/opt/rustwide/target/debug/deps/playing_with_rust-545f514eb83bbf4b)
[INFO] [stdout] 
[INFO] [stdout] running 17 tests
[INFO] [stdout] test exercises::ex01_ownership::tests::test_ownership ... ok
[INFO] [stdout] test exercises::ex02_borrowing_references::tests::test_average ... ok
[INFO] [stdout] test exercises::ex03_error_handling::tests::test_mean ... 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::ex03_error_handling::tests::test_find_greater ... 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::ex09_pattern_matching::tests::test_patterns ... ok
[INFO] [stdout] test exercises::ex10_lifetimes::tests::test_lifetimes ... ok
[INFO] [stdout] test exercises::ex07_generics::tests::test_find_max ... FAILED
[INFO] [stdout] test exercises::ex07_generics::tests::test_first ... FAILED
[INFO] [stdout] test exercises::ex08_collections::tests::test_group_statistics ... 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' (28) 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:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::trace_unsynchronized::<std[b80a194dd3c418bb]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5b936149293a - std[b80a194dd3c418bb]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5b936149293a - <<std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[10b6fa85044e1869]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5b93614a6b0a - <core[10b6fa85044e1869]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5b93614a6b0a - core[10b6fa85044e1869]::fmt::write
[INFO] [stdout]    6:     0x5b93614971c2 - std[b80a194dd3c418bb]::io::default_write_fmt::<alloc[dd269455e567d8e9]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5b93614971c2 - <alloc[dd269455e567d8e9]::vec::Vec<u8> as std[b80a194dd3c418bb]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x5b9361471b4f - <std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5b9361471b4f - std[b80a194dd3c418bb]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5b936148aea9 - std[b80a194dd3c418bb]::panicking::default_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5b9361427f0c - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   12:     0x5b9361427f0c - test[826cbc6ef54ab466]::test_main_with_exit_callback::<test[826cbc6ef54ab466]::test_main::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5b936148b062 - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   14:     0x5b936148b062 - std[b80a194dd3c418bb]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5b9361471c08 - std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x5b93614695a9 - std[b80a194dd3c418bb]::sys::backtrace::__rust_end_short_backtrace::<std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5b936147291d - __rustc[9698a3e60dd14283]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5b93614a73bc - core[10b6fa85044e1869]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5b93614a7273 - core[10b6fa85044e1869]::panicking::assert_failed_inner
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x5b9361413ee7 - core::panicking::assert_failed::h5c22c672e49ff794
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x5b9361418af8 - playing_with_rust::exercises::ex07_generics::tests::test_find_max::hfb3047a6c455ae78
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:114:9
[INFO] [stdout]   22:     0x5b9361418b77 - playing_with_rust::exercises::ex07_generics::tests::test_find_max::{{closure}}::hc81515f935244fac
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:113:23
[INFO] [stdout]   23:     0x5b9361412d96 - core::ops::function::FnOnce::call_once::h66b6113f654148f2
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x5b936141bfeb - <fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x5b936141bfeb - test[826cbc6ef54ab466]::__rust_begin_short_backtrace::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x5b93614289db - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x5b93614289db - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x5b93614289db - test[826cbc6ef54ab466]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x5b93614240f4 - test[826cbc6ef54ab466]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x5b93614240f4 - std[b80a194dd3c418bb]::sys::backtrace::__rust_begin_short_backtrace::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x5b936142b5e2 - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::<(), core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x5b936142b5e2 - <std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1} as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5b936149224f - <alloc[dd269455e567d8e9]::boxed::Box<dyn core[10b6fa85044e1869]::ops::function::FnOnce<(), Output = ()> + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2240:9
[INFO] [stdout]   43:     0x5b936149224f - <std[b80a194dd3c418bb]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   44:     0x7176d2b92aa4 - <unknown>
[INFO] [stdout]   45:     0x7176d2c1fa64 - 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' (29) 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:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::trace_unsynchronized::<std[b80a194dd3c418bb]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5b936149293a - std[b80a194dd3c418bb]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5b936149293a - <<std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[10b6fa85044e1869]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5b93614a6b0a - <core[10b6fa85044e1869]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5b93614a6b0a - core[10b6fa85044e1869]::fmt::write
[INFO] [stdout]    6:     0x5b93614971c2 - std[b80a194dd3c418bb]::io::default_write_fmt::<alloc[dd269455e567d8e9]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5b93614971c2 - <alloc[dd269455e567d8e9]::vec::Vec<u8> as std[b80a194dd3c418bb]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x5b9361471b4f - <std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5b9361471b4f - std[b80a194dd3c418bb]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5b936148aea9 - std[b80a194dd3c418bb]::panicking::default_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5b9361427f0c - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   12:     0x5b9361427f0c - test[826cbc6ef54ab466]::test_main_with_exit_callback::<test[826cbc6ef54ab466]::test_main::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5b936148b062 - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   14:     0x5b936148b062 - std[b80a194dd3c418bb]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5b9361471c08 - std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x5b93614695a9 - std[b80a194dd3c418bb]::sys::backtrace::__rust_end_short_backtrace::<std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5b936147291d - __rustc[9698a3e60dd14283]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5b93614a73bc - core[10b6fa85044e1869]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5b93614a7273 - core[10b6fa85044e1869]::panicking::assert_failed_inner
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x5b9361413ee7 - core::panicking::assert_failed::h5c22c672e49ff794
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x5b93614189f8 - playing_with_rust::exercises::ex07_generics::tests::test_first::he264822ef0893aea
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:108:9
[INFO] [stdout]   22:     0x5b9361418a77 - playing_with_rust::exercises::ex07_generics::tests::test_first::{{closure}}::h4ca8f07923de99cc
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex07_generics/mod.rs:107:20
[INFO] [stdout]   23:     0x5b9361412ca6 - core::ops::function::FnOnce::call_once::h3affc82885aaaa24
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x5b936141bfeb - <fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x5b936141bfeb - test[826cbc6ef54ab466]::__rust_begin_short_backtrace::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x5b93614289db - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x5b93614289db - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x5b93614289db - test[826cbc6ef54ab466]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x5b93614240f4 - test[826cbc6ef54ab466]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x5b93614240f4 - std[b80a194dd3c418bb]::sys::backtrace::__rust_begin_short_backtrace::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x5b936142b5e2 - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::<(), core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x5b936142b5e2 - <std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1} as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5b936149224f - <alloc[dd269455e567d8e9]::boxed::Box<dyn core[10b6fa85044e1869]::ops::function::FnOnce<(), Output = ()> + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2240:9
[INFO] [stdout]   43:     0x5b936149224f - <std[b80a194dd3c418bb]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   44:     0x7176d2b92aa4 - <unknown>
[INFO] [stdout]   45:     0x7176d2c1fa64 - 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' (30) 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:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5b936149293a - std[b80a194dd3c418bb]::backtrace_rs::backtrace::trace_unsynchronized::<std[b80a194dd3c418bb]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5b936149293a - std[b80a194dd3c418bb]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5b936149293a - <<std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[10b6fa85044e1869]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5b93614a6b0a - <core[10b6fa85044e1869]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5b93614a6b0a - core[10b6fa85044e1869]::fmt::write
[INFO] [stdout]    6:     0x5b93614971c2 - std[b80a194dd3c418bb]::io::default_write_fmt::<alloc[dd269455e567d8e9]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5b93614971c2 - <alloc[dd269455e567d8e9]::vec::Vec<u8> as std[b80a194dd3c418bb]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x5b9361471b4f - <std[b80a194dd3c418bb]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5b9361471b4f - std[b80a194dd3c418bb]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5b936148aea9 - std[b80a194dd3c418bb]::panicking::default_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5b9361427f0c - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   12:     0x5b9361427f0c - test[826cbc6ef54ab466]::test_main_with_exit_callback::<test[826cbc6ef54ab466]::test_main::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5b936148b062 - <alloc[dd269455e567d8e9]::boxed::Box<dyn for<'a, 'b> core[10b6fa85044e1869]::ops::function::Fn<(&'a std[b80a194dd3c418bb]::panic::PanicHookInfo<'b>,), Output = ()> + core[10b6fa85044e1869]::marker::Sync + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::Fn<(&std[b80a194dd3c418bb]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2254:9
[INFO] [stdout]   14:     0x5b936148b062 - std[b80a194dd3c418bb]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5b9361471c08 - std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x5b93614695a9 - std[b80a194dd3c418bb]::sys::backtrace::__rust_end_short_backtrace::<std[b80a194dd3c418bb]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5b936147291d - __rustc[9698a3e60dd14283]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5b93614a73bc - core[10b6fa85044e1869]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5b93614a7273 - core[10b6fa85044e1869]::panicking::assert_failed_inner
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x5b936141402b - core::panicking::assert_failed::hd853f659dddf875d
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x5b93614154ac - playing_with_rust::exercises::ex08_collections::tests::test_group_statistics::h6ac436cde4c1cf5f
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex08_collections/mod.rs:127:9
[INFO] [stdout]   22:     0x5b93614154f7 - playing_with_rust::exercises::ex08_collections::tests::test_group_statistics::{{closure}}::hf70ac3543bdbe1e9
[INFO] [stdout]                                at /opt/rustwide/workdir/exercises/ex08_collections/mod.rs:124:31
[INFO] [stdout]   23:     0x5b9361412bb6 - core::ops::function::FnOnce::call_once::h21730c4168ea8ddb
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x5b936141bfeb - <fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x5b936141bfeb - test[826cbc6ef54ab466]::__rust_begin_short_backtrace::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, fn() -> core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x5b93614289db - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x5b93614289db - std[b80a194dd3c418bb]::panicking::catch_unwind::<core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>, core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x5b93614289db - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<test[826cbc6ef54ab466]::run_test_in_process::{closure#0}>, core[10b6fa85044e1869]::result::Result<(), alloc[dd269455e567d8e9]::string::String>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5b93614289db - test[826cbc6ef54ab466]::run_test_in_process
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x5b93614289db - test[826cbc6ef54ab466]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x5b93614240f4 - test[826cbc6ef54ab466]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x5b93614240f4 - std[b80a194dd3c418bb]::sys::backtrace::__rust_begin_short_backtrace::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x5b936142b5e2 - <core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::do_call::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panicking::catch_unwind::<(), core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x5b936142b5e2 - std[b80a194dd3c418bb]::panic::catch_unwind::<core[10b6fa85044e1869]::panic::unwind_safe::AssertUnwindSafe<std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5b936142b5e2 - std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked::<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x5b936142b5e2 - <std[b80a194dd3c418bb]::thread::lifecycle::spawn_unchecked<test[826cbc6ef54ab466]::run_test::{closure#1}, ()>::{closure#1} as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5b936149224f - <alloc[dd269455e567d8e9]::boxed::Box<dyn core[10b6fa85044e1869]::ops::function::FnOnce<(), Output = ()> + core[10b6fa85044e1869]::marker::Send> as core[10b6fa85044e1869]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/alloc/src/boxed.rs:2240:9
[INFO] [stdout]   43:     0x5b936149224f - <std[b80a194dd3c418bb]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/ad726b5063362ec9897ef3d67452fc5606ee70fa/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   44:     0x7176d2b92aa4 - <unknown>
[INFO] [stdout]   45:     0x7176d2c1fa64 - 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 0.03s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin playing-with-rust`
[INFO] running `Command { std: "docker" "inspect" "1f3aaee94a25cadeb4eb82b9aa6b2d277c23ffb741de2b51c14d5b9c745a4d1a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f3aaee94a25cadeb4eb82b9aa6b2d277c23ffb741de2b51c14d5b9c745a4d1a", kill_on_drop: false }`
[INFO] [stdout] 1f3aaee94a25cadeb4eb82b9aa6b2d277c23ffb741de2b51c14d5b9c745a4d1a
