[INFO] cloning repository https://github.com/Saurus9290/rust-lifetimes-tutorial
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[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSaurus9290%2Frust-lifetimes-tutorial'...
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[INFO] testing Saurus9290/rust-lifetimes-tutorial against beta-2025-09-21 for beta-1.91-2
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[INFO] validating manifest of git repo https://github.com/Saurus9290/rust-lifetimes-tutorial on toolchain beta-2025-09-21
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[INFO] crate git repo https://github.com/Saurus9290/rust-lifetimes-tutorial 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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5aef46dc90518f1d97924fcaf11749a607c50561eabc2643d3f3a4b9207c9c4d
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[INFO] running `Command { std: "docker" "inspect" "5aef46dc90518f1d97924fcaf11749a607c50561eabc2643d3f3a4b9207c9c4d", kill_on_drop: false }`
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[INFO] [stdout] 5aef46dc90518f1d97924fcaf11749a607c50561eabc2643d3f3a4b9207c9c4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b1f182d77f13b8d6143d68d0047223e575bb4edb9aa471f4262fb7b7eadc8ce4
[INFO] running `Command { std: "docker" "start" "-a" "b1f182d77f13b8d6143d68d0047223e575bb4edb9aa471f4262fb7b7eadc8ce4", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-lifetimes-tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: methods `get_text`, `first_line`, and `starts_with_word` are never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:90:8
[INFO] [stdout]     |
[INFO] [stdout]  85 | impl<'a> TextAnalyzer<'a> {
[INFO] [stdout]     | ------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  90 |     fn get_text(&self) -> &str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  94 |     fn first_line(&self) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 106 |     fn starts_with_word(&self, word: &str) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Container` is never constructed
[INFO] [stdout]    --> src/08_lifetime_elision.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 | struct Container<'a> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_data` and `compare` are never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:144:8
[INFO] [stdout]     |
[INFO] [stdout] 143 | impl<'a> Container<'a> {
[INFO] [stdout]     | ---------------------- methods in this implementation
[INFO] [stdout] 144 |     fn get_data(&self) -> &str {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 148 |     fn compare(&self, other: &str) -> bool {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demonstrate_elision_rules_detailed` is never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:154:4
[INFO] [stdout]     |
[INFO] [stdout] 154 | fn demonstrate_elision_rules_detailed() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Extractable` is never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:162:7
[INFO] [stdout]     |
[INFO] [stdout] 162 | trait Extractable {
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 235 | impl<'a> Container<'a> {
[INFO] [stdout]     | ---------------------- associated function in this implementation
[INFO] [stdout] 236 |     fn new(data: &'a str) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TextProcessor` is never constructed
[INFO] [stdout]    --> src/04_function_lifetimes.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 | struct TextProcessor<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_words`, and `get_first_word` are never used
[INFO] [stdout]    --> src/04_function_lifetimes.rs:120:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'a> TextProcessor<'a> {
[INFO] [stdout]     | -------------------------- associated items in this implementation
[INFO] [stdout] 120 |     fn new(text: &'a str) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 124 |     fn get_words(&self) -> Vec<&'a str> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 128 |     fn get_first_word(&self) -> Option<&'a str> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/07_advanced_examples.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_or_default` is never used
[INFO] [stdout]   --> src/02_basic_syntax.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn first_word_or_default<'a, 'b>(text: &'a str, _default: &'b str) -> &'a str {
[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 `first_word_or_default_fixed` is never used
[INFO] [stdout]   --> src/02_basic_syntax.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn first_word_or_default_fixed<'a>(text: &'a str, default: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `find_pattern` is never used
[INFO] [stdout]   --> src/06_common_patterns.rs:98:8
[INFO] [stdout]    |
[INFO] [stdout] 86 | impl<'a> SimpleParser<'a> {
[INFO] [stdout]    | ------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 98 |     fn find_pattern(&self, pattern: &str) -> Vec<&'a str> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `keys` is never used
[INFO] [stdout]    --> src/06_common_patterns.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 133 | impl<'a> Config<'a> {
[INFO] [stdout]     | ------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 150 |     fn keys(&self) -> Vec<&'a str> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear` is never used
[INFO] [stdout]    --> src/06_common_patterns.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 180 | impl SimpleCache {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn clear(&mut self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `QueryBuilder` is never constructed
[INFO] [stdout]    --> src/06_common_patterns.rs:203:8
[INFO] [stdout]     |
[INFO] [stdout] 203 | struct QueryBuilder<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `table`, `where_clause`, `limit`, and `build` are never used
[INFO] [stdout]    --> src/06_common_patterns.rs:210:8
[INFO] [stdout]     |
[INFO] [stdout] 209 | impl<'a> QueryBuilder<'a> {
[INFO] [stdout]     | ------------------------- associated items in this implementation
[INFO] [stdout] 210 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 218 |     fn table(mut self, table: &'a str) -> Self {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 223 |     fn where_clause(mut self, condition: &'a str) -> Self {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 228 |     fn limit(mut self, limit: usize) -> Self {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 233 |     fn build(&self) -> String {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `explain_the_error` is never used
[INFO] [stdout]   --> src/03_classic_problem.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn explain_the_error() {
[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 `dangerous_function` is never used
[INFO] [stdout]   --> src/03_classic_problem.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn dangerous_function() -> &'static str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/03_classic_problem.rs:89:4
[INFO] [stdout]    |
[INFO] [stdout] 89 | fn first_word<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `title` and `content` are never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Book<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 37 |     title: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 38 |     content: &'a str,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start_pos` is never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Chapter<'a> {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 46 |     start_pos: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `position` are never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | struct Bookmark<'a> {
[INFO] [stdout]    |        -------- fields in this struct
[INFO] [stdout] 51 |     name: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 52 |     position: usize,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Bookmark` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_first` is never used
[INFO] [stdout]    --> src/07_advanced_examples.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 137 | / impl<'a, T> DataProcessor<'a, T> 
[INFO] [stdout] 138 | | where 
[INFO] [stdout] 139 | |     T: std::fmt::Display + 'a,
[INFO] [stdout]     | |______________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 160 |       fn get_first(&self) -> Option<&'a T> {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `data` are never read
[INFO] [stdout]    --> src/07_advanced_examples.rs:195:5
[INFO] [stdout]     |
[INFO] [stdout] 194 | struct Node<'a> {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 195 |     id: usize,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 196 |     data: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Processor` is never used
[INFO] [stdout]    --> src/07_advanced_examples.rs:255:7
[INFO] [stdout]     |
[INFO] [stdout] 255 | trait Processor<'a> {
[INFO] [stdout]     |       ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UppercaseProcessor` is never constructed
[INFO] [stdout]    --> src/07_advanced_examples.rs:259:8
[INFO] [stdout]     |
[INFO] [stdout] 259 | struct UppercaseProcessor;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TrimProcessor` is never constructed
[INFO] [stdout]    --> src/07_advanced_examples.rs:260:8
[INFO] [stdout]     |
[INFO] [stdout] 260 | struct TrimProcessor;
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `process_with_trait` is never used
[INFO] [stdout]    --> src/07_advanced_examples.rs:274:4
[INFO] [stdout]     |
[INFO] [stdout] 274 | fn process_with_trait<'a>(input: &'a str, processor: &dyn Processor<'a>) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `find_substring` is never used
[INFO] [stdout]    --> src/05_struct_lifetimes.rs:133:8
[INFO] [stdout]     |
[INFO] [stdout] 124 | impl<'a> TextParser<'a> {
[INFO] [stdout]     | ----------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 133 |     fn find_substring(&self, pattern: &str) -> Option<&'a str> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MixedData` is never constructed
[INFO] [stdout]    --> src/05_struct_lifetimes.rs:154:8
[INFO] [stdout]     |
[INFO] [stdout] 154 | struct MixedData<'a> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `get_title`, `get_content`, and `get_summary` are never used
[INFO] [stdout]    --> src/05_struct_lifetimes.rs:161:8
[INFO] [stdout]     |
[INFO] [stdout] 160 | impl<'a> MixedData<'a> {
[INFO] [stdout]     | ---------------------- associated items in this implementation
[INFO] [stdout] 161 |     fn new(title: String, content: &'a str, id: u32) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 169 |     fn get_title(&self) -> &str {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 173 |     fn get_content(&self) -> &'a str {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 177 |     fn get_summary(&self) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `create_invalid_book` is never used
[INFO] [stdout]    --> src/05_struct_lifetimes.rs:183:4
[INFO] [stdout]     |
[INFO] [stdout] 183 | fn create_invalid_book() -> Book<'static> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_document` and `get_config` are never used
[INFO] [stdout]   --> src/09_best_practices.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl<'document, 'config> DocumentParser<'document, 'config> {
[INFO] [stdout]    | ----------------------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_document(&self) -> &'document str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 76 |     fn get_config(&self) -> &'config str {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/09_best_practices.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | struct TreeNode {
[INFO] [stdout]     |        -------- field in this struct
[INFO] [stdout] 158 |     data: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `raw_config` is never read
[INFO] [stdout]    --> src/09_best_practices.rs:210:5
[INFO] [stdout]     |
[INFO] [stdout] 209 | struct AppConfig<'a> {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 210 |     raw_config: &'a str,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `count_characters` is never used
[INFO] [stdout]    --> src/09_best_practices.rs:253:8
[INFO] [stdout]     |
[INFO] [stdout] 241 | impl TextProcessor {
[INFO] [stdout]     | ------------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 253 |     fn count_characters(&self, text: &str) -> std::collections::HashMap<char, usize> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear` is never used
[INFO] [stdout]    --> src/09_best_practices.rs:285:8
[INFO] [stdout]     |
[INFO] [stdout] 266 | impl StringCache {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 285 |     fn clear(&mut self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_best_practices` is never used
[INFO] [stdout]    --> src/09_best_practices.rs:290:4
[INFO] [stdout]     |
[INFO] [stdout] 290 | fn print_best_practices() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.09s
[INFO] running `Command { std: "docker" "inspect" "b1f182d77f13b8d6143d68d0047223e575bb4edb9aa471f4262fb7b7eadc8ce4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1f182d77f13b8d6143d68d0047223e575bb4edb9aa471f4262fb7b7eadc8ce4", kill_on_drop: false }`
[INFO] [stdout] b1f182d77f13b8d6143d68d0047223e575bb4edb9aa471f4262fb7b7eadc8ce4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a8f03e06d47797f7b4d8b6935b55edbe5a3c90134315aba826f969eda6e2e17
[INFO] running `Command { std: "docker" "start" "-a" "0a8f03e06d47797f7b4d8b6935b55edbe5a3c90134315aba826f969eda6e2e17", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-lifetimes-tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/07_advanced_examples.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `title` and `content` are never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 36 | struct Book<'a> {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 37 |     title: &'a str,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 38 |     content: &'a str,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `start_pos` is never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:46:5
[INFO] [stdout]    |
[INFO] [stdout] 43 | struct Chapter<'a> {
[INFO] [stdout]    |        ------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 46 |     start_pos: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `position` are never read
[INFO] [stdout]   --> src/07_advanced_examples.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 50 | struct Bookmark<'a> {
[INFO] [stdout]    |        -------- fields in this struct
[INFO] [stdout] 51 |     name: &'a str,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 52 |     position: usize,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Bookmark` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_first` is never used
[INFO] [stdout]    --> src/07_advanced_examples.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 137 | / impl<'a, T> DataProcessor<'a, T> 
[INFO] [stdout] 138 | | where 
[INFO] [stdout] 139 | |     T: std::fmt::Display + 'a,
[INFO] [stdout]     | |______________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 160 |       fn get_first(&self) -> Option<&'a T> {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `data` are never read
[INFO] [stdout]    --> src/07_advanced_examples.rs:195:5
[INFO] [stdout]     |
[INFO] [stdout] 194 | struct Node<'a> {
[INFO] [stdout]     |        ---- fields in this struct
[INFO] [stdout] 195 |     id: usize,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 196 |     data: &'a str,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `UppercaseProcessor` is never constructed
[INFO] [stdout]    --> src/07_advanced_examples.rs:259:8
[INFO] [stdout]     |
[INFO] [stdout] 259 | struct UppercaseProcessor;
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word_or_default` is never used
[INFO] [stdout]   --> src/02_basic_syntax.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn first_word_or_default<'a, 'b>(text: &'a str, _default: &'b str) -> &'a str {
[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 `create_invalid_book` is never used
[INFO] [stdout]    --> src/05_struct_lifetimes.rs:183:4
[INFO] [stdout]     |
[INFO] [stdout] 183 | fn create_invalid_book() -> Book<'static> {
[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 `explain_the_error` is never used
[INFO] [stdout]   --> src/03_classic_problem.rs:69:4
[INFO] [stdout]    |
[INFO] [stdout] 69 | fn explain_the_error() {
[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 `dangerous_function` is never used
[INFO] [stdout]   --> src/03_classic_problem.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn dangerous_function() -> &'static str {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demonstrate_elision_rules_detailed` is never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:154:4
[INFO] [stdout]     |
[INFO] [stdout] 154 | fn demonstrate_elision_rules_detailed() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Extractable` is never used
[INFO] [stdout]    --> src/08_lifetime_elision.rs:162:7
[INFO] [stdout]     |
[INFO] [stdout] 162 | trait Extractable {
[INFO] [stdout]     |       ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `get_document` and `get_config` are never used
[INFO] [stdout]   --> src/09_best_practices.rs:72:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | impl<'document, 'config> DocumentParser<'document, 'config> {
[INFO] [stdout]    | ----------------------------------------------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 72 |     fn get_document(&self) -> &'document str {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 76 |     fn get_config(&self) -> &'config str {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `data` is never read
[INFO] [stdout]    --> src/09_best_practices.rs:158:5
[INFO] [stdout]     |
[INFO] [stdout] 157 | struct TreeNode {
[INFO] [stdout]     |        -------- field in this struct
[INFO] [stdout] 158 |     data: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `raw_config` is never read
[INFO] [stdout]    --> src/09_best_practices.rs:210:5
[INFO] [stdout]     |
[INFO] [stdout] 209 | struct AppConfig<'a> {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 210 |     raw_config: &'a str,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear` is never used
[INFO] [stdout]    --> src/09_best_practices.rs:285:8
[INFO] [stdout]     |
[INFO] [stdout] 266 | impl StringCache {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 285 |     fn clear(&mut self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_best_practices` is never used
[INFO] [stdout]    --> src/09_best_practices.rs:290:4
[INFO] [stdout]     |
[INFO] [stdout] 290 | fn print_best_practices() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `keys` is never used
[INFO] [stdout]    --> src/06_common_patterns.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 133 | impl<'a> Config<'a> {
[INFO] [stdout]     | ------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 150 |     fn keys(&self) -> Vec<&'a str> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `clear` is never used
[INFO] [stdout]    --> src/06_common_patterns.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 180 | impl SimpleCache {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 198 |     fn clear(&mut self) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.89s
[INFO] running `Command { std: "docker" "inspect" "0a8f03e06d47797f7b4d8b6935b55edbe5a3c90134315aba826f969eda6e2e17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a8f03e06d47797f7b4d8b6935b55edbe5a3c90134315aba826f969eda6e2e17", kill_on_drop: false }`
[INFO] [stdout] 0a8f03e06d47797f7b4d8b6935b55edbe5a3c90134315aba826f969eda6e2e17
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ce149351976f0e486b5da48a0da0d2244ad6032c38f5565dae351344e002249e
[INFO] running `Command { std: "docker" "start" "-a" "ce149351976f0e486b5da48a0da0d2244ad6032c38f5565dae351344e002249e", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/07_advanced_examples.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `title` and `content` are never read
[INFO] [stderr]   --> src/07_advanced_examples.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | struct Book<'a> {
[INFO] [stderr]    |        ---- fields in this struct
[INFO] [stderr] 37 |     title: &'a str,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 38 |     content: &'a str,
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `start_pos` is never read
[INFO] [stderr]   --> src/07_advanced_examples.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | struct Chapter<'a> {
[INFO] [stderr]    |        ------- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 46 |     start_pos: usize,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `name` and `position` are never read
[INFO] [stderr]   --> src/07_advanced_examples.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 50 | struct Bookmark<'a> {
[INFO] [stderr]    |        -------- fields in this struct
[INFO] [stderr] 51 |     name: &'a str,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 52 |     position: usize,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Bookmark` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: method `get_first` is never used
[INFO] [stderr]    --> src/07_advanced_examples.rs:160:8
[INFO] [stderr]     |
[INFO] [stderr] 137 | / impl<'a, T> DataProcessor<'a, T> 
[INFO] [stderr] 138 | | where 
[INFO] [stderr] 139 | |     T: std::fmt::Display + 'a,
[INFO] [stderr]     | |______________________________- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 160 |       fn get_first(&self) -> Option<&'a T> {
[INFO] [stderr]     |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: fields `id` and `data` are never read
[INFO] [stderr]    --> src/07_advanced_examples.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 194 | struct Node<'a> {
[INFO] [stderr]     |        ---- fields in this struct
[INFO] [stderr] 195 |     id: usize,
[INFO] [stderr]     |     ^^
[INFO] [stderr] 196 |     data: &'a str,
[INFO] [stderr]     |     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `Node` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] 
[INFO] [stderr] warning: struct `UppercaseProcessor` is never constructed
[INFO] [stderr]    --> src/07_advanced_examples.rs:259:8
[INFO] [stderr]     |
[INFO] [stderr] 259 | struct UppercaseProcessor;
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "advanced_examples" test) generated 7 warnings (run `cargo fix --bin "advanced_examples" --tests` to apply 1 suggestion)
[INFO] [stderr] warning: function `demonstrate_elision_rules_detailed` is never used
[INFO] [stderr]    --> src/08_lifetime_elision.rs:154:4
[INFO] [stderr]     |
[INFO] [stderr] 154 | fn demonstrate_elision_rules_detailed() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Extractable` is never used
[INFO] [stderr]    --> src/08_lifetime_elision.rs:162:7
[INFO] [stderr]     |
[INFO] [stderr] 162 | trait Extractable {
[INFO] [stderr]     |       ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "lifetime_elision" test) generated 2 warnings
[INFO] [stderr] warning: methods `get_document` and `get_config` are never used
[INFO] [stderr]   --> src/09_best_practices.rs:72:8
[INFO] [stderr]    |
[INFO] [stderr] 61 | impl<'document, 'config> DocumentParser<'document, 'config> {
[INFO] [stderr]    | ----------------------------------------------------------- methods in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 72 |     fn get_document(&self) -> &'document str {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 76 |     fn get_config(&self) -> &'config str {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `data` is never read
[INFO] [stderr]    --> src/09_best_practices.rs:158:5
[INFO] [stderr]     |
[INFO] [stderr] 157 | struct TreeNode {
[INFO] [stderr]     |        -------- field in this struct
[INFO] [stderr] 158 |     data: String,
[INFO] [stderr]     |     ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `raw_config` is never read
[INFO] [stderr]    --> src/09_best_practices.rs:210:5
[INFO] [stderr]     |
[INFO] [stderr] 209 | struct AppConfig<'a> {
[INFO] [stderr]     |        --------- field in this struct
[INFO] [stderr] 210 |     raw_config: &'a str,
[INFO] [stderr]     |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `clear` is never used
[INFO] [stderr]    --> src/09_best_practices.rs:285:8
[INFO] [stderr]     |
[INFO] [stderr] 266 | impl StringCache {
[INFO] [stderr]     | ---------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 285 |     fn clear(&mut self) {
[INFO] [stderr]     |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `print_best_practices` is never used
[INFO] [stderr]    --> src/09_best_practices.rs:290:4
[INFO] [stderr]     |
[INFO] [stderr] 290 | fn print_best_practices() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "best_practices" test) generated 5 warnings
[INFO] [stderr] warning: function `create_invalid_book` is never used
[INFO] [stderr]    --> src/05_struct_lifetimes.rs:183:4
[INFO] [stderr]     |
[INFO] [stderr] 183 | fn create_invalid_book() -> Book<'static> {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "struct_lifetimes" test) generated 1 warning
[INFO] [stderr] warning: function `first_word_or_default` is never used
[INFO] [stderr]   --> src/02_basic_syntax.rs:46:4
[INFO] [stderr]    |
[INFO] [stderr] 46 | fn first_word_or_default<'a, 'b>(text: &'a str, _default: &'b str) -> &'a str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "basic_syntax" test) generated 1 warning
[INFO] [stderr] warning: function `explain_the_error` is never used
[INFO] [stderr]   --> src/03_classic_problem.rs:69:4
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn explain_the_error() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `dangerous_function` is never used
[INFO] [stderr]   --> src/03_classic_problem.rs:84:4
[INFO] [stderr]    |
[INFO] [stderr] 84 | fn dangerous_function() -> &'static str {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "classic_problem" test) generated 2 warnings
[INFO] [stderr] warning: method `keys` is never used
[INFO] [stderr]    --> src/06_common_patterns.rs:150:8
[INFO] [stderr]     |
[INFO] [stderr] 133 | impl<'a> Config<'a> {
[INFO] [stderr]     | ------------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 150 |     fn keys(&self) -> Vec<&'a str> {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `clear` is never used
[INFO] [stderr]    --> src/06_common_patterns.rs:198:8
[INFO] [stderr]     |
[INFO] [stderr] 180 | impl SimpleCache {
[INFO] [stderr]     | ---------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 198 |     fn clear(&mut self) {
[INFO] [stderr]     |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-lifetimes-tutorial` (bin "common_patterns" test) generated 2 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_lifetimes_tutorial-4a9708981fbfd313)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::test_example_longest ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/07_advanced_examples.rs (/opt/rustwide/target/debug/deps/advanced_examples-98723a15b44aedd6)
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test tests::test_book_chapters ... ok
[INFO] [stdout] test tests::test_trait_objects ... ok
[INFO] [stdout] test tests::test_data_processor ... ok
[INFO] [stdout] test tests::test_graph ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/02_basic_syntax.rs (/opt/rustwide/target/debug/deps/basic_syntax-1ea301ec35ff0bf9)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_longest_function ... ok
[INFO] [stdout] test tests::test_lifetime_relationships ... ok
[INFO] [stdout] test tests::test_first_word_function ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/09_best_practices.rs (/opt/rustwide/target/debug/deps/best_practices-e7473d53dd4118fd)
[INFO] [stdout] 
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::test_owned_types ... ok
[INFO] [stdout] test tests::test_string_cache ... ok
[INFO] [stdout] test tests::test_query_builder ... ok
[INFO] [stdout] test tests::test_app_config ... ok
[INFO] [stdout] test tests::test_simple_tree ... ok
[INFO] [stderr] error: test failed, to rerun pass `--bin best_practices`
[INFO] [stdout] test tests::test_text_processor ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::test_text_processor stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'tests::test_text_processor' (41) panicked at src/09_best_practices.rs:360:9:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: []
[INFO] [stdout]  right: ["hello", "world", "test"]
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x58999c8fd672 - std::backtrace_rs::backtrace::libunwind::trace::hcab59e1e990fdc24
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x58999c8fd672 - std::backtrace_rs::backtrace::trace_unsynchronized::he24cc57f3d2f47b7
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x58999c8fd672 - std::sys::backtrace::_print_fmt::hf8d65ede198eeb54
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:66:9
[INFO] [stdout]    3:     0x58999c8fd672 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h67edf0e4d33c343c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:39:26
[INFO] [stdout]    4:     0x58999c90e55f - core::fmt::rt::Argument::fmt::hef94184842aeafdd
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/fmt/rt.rs:173:76
[INFO] [stdout]    5:     0x58999c90e55f - core::fmt::write::hcf0c66b48a8fa606
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/fmt/mod.rs:1468:25
[INFO] [stdout]    6:     0x58999c8cabe1 - std::io::default_write_fmt::h69967ac0ba93195f
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x58999c8cabe1 - std::io::Write::write_fmt::h8db9396209deaa1c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/io/mod.rs:1954:13
[INFO] [stdout]    8:     0x58999c8d6c42 - std::sys::backtrace::BacktraceLock::print::h07e5435aa717b414
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:42:9
[INFO] [stdout]    9:     0x58999c8db78f - std::panicking::default_hook::{{closure}}::h91001850288db5f7
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:301:27
[INFO] [stdout]   10:     0x58999c8db621 - std::panicking::default_hook::h2346dbb704ef5512
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:325:9
[INFO] [stdout]   11:     0x58999c89c1ee - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h18383b2e29377420
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1999:9
[INFO] [stdout]   12:     0x58999c89c1ee - test::test_main_with_exit_callback::{{closure}}::h272d7ef99aef06dc
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x58999c8dbe4f - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h6dba6e441651a0d1
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1999:9
[INFO] [stdout]   14:     0x58999c8dbe4f - std::panicking::panic_with_hook::hd2b063a6090d23a4
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:842:13
[INFO] [stdout]   15:     0x58999c8dbcaa - std::panicking::panic_handler::{{closure}}::he666d95f139a333e
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:707:13
[INFO] [stdout]   16:     0x58999c8d6d79 - std::sys::backtrace::__rust_end_short_backtrace::h631ad224854ebee5
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:174:18
[INFO] [stdout]   17:     0x58999c8bf0bd - __rustc[1d67440d6e82e4f]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:698:5
[INFO] [stdout]   18:     0x58999c916320 - core::panicking::panic_fmt::h420ddb7fd73daf53
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panicking.rs:75:14
[INFO] [stdout]   19:     0x58999c916123 - core::panicking::assert_failed_inner::h448e1d534f4c3d4b
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x58999c87a004 - core::panicking::assert_failed::h46e22ac666332d76
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x58999c872929 - best_practices::tests::test_text_processor::h7814c79ffe35f526
[INFO] [stdout]                                at /opt/rustwide/workdir/src/09_best_practices.rs:360:9
[INFO] [stdout]   22:     0x58999c872b07 - best_practices::tests::test_text_processor::{{closure}}::he66bcea71da660c0
[INFO] [stdout]                                at /opt/rustwide/workdir/src/09_best_practices.rs:355:29
[INFO] [stdout]   23:     0x58999c8783f6 - core::ops::function::FnOnce::call_once::haed32ff10506da9d
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x58999c89bfab - core::ops::function::FnOnce::call_once::h70887edf07a630ba
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x58999c89bfab - test::__rust_begin_short_backtrace::h27763c4cbbdb8601
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x58999c8b1c15 - test::run_test_in_process::{{closure}}::h4dc8bc6d5e3924d3
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x58999c8b1c15 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h75905e8ffe81974f
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x58999c8b1c15 - std::panicking::catch_unwind::do_call::h0bc60366ba66eba5
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:590:40
[INFO] [stdout]   29:     0x58999c8b1c15 - std::panicking::catch_unwind::hae1ec7bf94407afa
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:553:19
[INFO] [stdout]   30:     0x58999c8b1c15 - std::panic::catch_unwind::h0f4ff4773d84d3cd
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x58999c8b1c15 - test::run_test_in_process::h03fbc77ae48b3f10
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x58999c8b1c15 - test::run_test::{{closure}}::h83476a9c453dc4d3
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x58999c888404 - test::run_test::{{closure}}::h515482ad1e7fe7de
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x58999c888404 - std::sys::backtrace::__rust_begin_short_backtrace::hed09f6ac5fe9d647
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/backtrace.rs:158:18
[INFO] [stdout]   35:     0x58999c88bcca - std::thread::Builder::spawn_unchecked_::{{closure}}::{{closure}}::h988e2cd969319888
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/thread/mod.rs:559:17
[INFO] [stdout]   36:     0x58999c88bcca - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hd70e28dc46ec20be
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x58999c88bcca - std::panicking::catch_unwind::do_call::hdc29e11311eb7655
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:590:40
[INFO] [stdout]   38:     0x58999c88bcca - std::panicking::catch_unwind::h9e402d6a96fef41c
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panicking.rs:553:19
[INFO] [stdout]   39:     0x58999c88bcca - std::panic::catch_unwind::h9213c0c54aec70e0
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x58999c88bcca - std::thread::Builder::spawn_unchecked_::{{closure}}::h6262965869ed2b87
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/thread/mod.rs:557:30
[INFO] [stdout]   41:     0x58999c88bcca - core::ops::function::FnOnce::call_once{{vtable.shim}}::h05c05ed02619e462
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x58999c8d1edf - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h2044e71c41d3958a
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/alloc/src/boxed.rs:1985:9
[INFO] [stdout]   43:     0x58999c8d1edf - std::sys::thread::unix::Thread::new::thread_start::hf277835320aa8e5a
[INFO] [stdout]                                at /rustc/bb624dcb4c8ab987e10c0808d92d76f3b84dd117/library/std/src/sys/thread/unix.rs:126:17
[INFO] [stdout]   44:     0x74b415717aa4 - <unknown>
[INFO] [stdout]   45:     0x74b4157a4a34 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::test_text_processor
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 5 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.13s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ce149351976f0e486b5da48a0da0d2244ad6032c38f5565dae351344e002249e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce149351976f0e486b5da48a0da0d2244ad6032c38f5565dae351344e002249e", kill_on_drop: false }`
[INFO] [stdout] ce149351976f0e486b5da48a0da0d2244ad6032c38f5565dae351344e002249e
