[INFO] cloning repository https://github.com/Kerrryu/LearnRustTUI
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Kerrryu/LearnRustTUI" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKerrryu%2FLearnRustTUI", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKerrryu%2FLearnRustTUI'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7cd89ac0862a6c710c1e86f083ac80584a03be2a
[INFO] checking Kerrryu/LearnRustTUI against try#f77b5bc6c7c84df104f86b0dd01d9490e3923fa8 for pr-147834
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKerrryu%2FLearnRustTUI" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-6-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/Kerrryu/LearnRustTUI
[INFO] finished tweaking git repo https://github.com/Kerrryu/LearnRustTUI
[INFO] tweaked toml for git repo https://github.com/Kerrryu/LearnRustTUI written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kerrryu/LearnRustTUI on toolchain f77b5bc6c7c84df104f86b0dd01d9490e3923fa8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kerrryu/LearnRustTUI 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" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking Kerrryu/LearnRustTUI against try#f77b5bc6c7c84df104f86b0dd01d9490e3923fa8 for pr-147834
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKerrryu%2FLearnRustTUI" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-6-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/Kerrryu/LearnRustTUI
[INFO] finished tweaking git repo https://github.com/Kerrryu/LearnRustTUI
[INFO] tweaked toml for git repo https://github.com/Kerrryu/LearnRustTUI written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Kerrryu/LearnRustTUI on toolchain f77b5bc6c7c84df104f86b0dd01d9490e3923fa8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Kerrryu/LearnRustTUI 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" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded insta v1.43.2
[INFO] [stderr]   Downloaded ratatui v0.26.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d56987f41e21b9eb81bba5202e3196e5ec1e4593fcf4df9136333088b19b11f4
[INFO] running `Command { std: "docker" "start" "-a" "d56987f41e21b9eb81bba5202e3196e5ec1e4593fcf4df9136333088b19b11f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d56987f41e21b9eb81bba5202e3196e5ec1e4593fcf4df9136333088b19b11f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d56987f41e21b9eb81bba5202e3196e5ec1e4593fcf4df9136333088b19b11f4", kill_on_drop: false }`
[INFO] [stdout] d56987f41e21b9eb81bba5202e3196e5ec1e4593fcf4df9136333088b19b11f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+f77b5bc6c7c84df104f86b0dd01d9490e3923fa8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bd52c853e77886fed4e25652f75980bc674692c62ad8431f997e939fb83a032
[INFO] running `Command { std: "docker" "start" "-a" "4bd52c853e77886fed4e25652f75980bc674692c62ad8431f997e939fb83a032", kill_on_drop: false }`
[INFO] [stderr]     Checking regex-syntax v0.8.6
[INFO] [stderr]    Compiling rustix v1.1.2
[INFO] [stderr]     Checking linux-raw-sys v0.11.0
[INFO] [stderr]     Checking bitflags v2.9.4
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking unarray v0.1.4
[INFO] [stderr]     Checking anstyle-query v1.1.4
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking wait-timeout v0.2.1
[INFO] [stderr]     Checking hashbrown v0.15.5
[INFO] [stderr]     Checking rand v0.9.2
[INFO] [stderr]     Checking rand_xorshift v0.4.0
[INFO] [stderr]     Checking winnow v0.7.13
[INFO] [stderr]     Checking toml_write v0.1.2
[INFO] [stderr]     Checking dirs-sys v0.4.1
[INFO] [stderr]     Checking anstream v0.6.20
[INFO] [stderr]     Checking console v0.15.11
[INFO] [stderr]     Checking similar v2.7.0
[INFO] [stderr]     Checking directories v5.0.1
[INFO] [stderr]     Checking ex12_db_sqlx v0.1.0 (/opt/rustwide/workdir/exercises/12-db-sqlx)
[INFO] [stderr]     Checking ex04_traits_generics v0.1.0 (/opt/rustwide/workdir/exercises/04-traits-generics)
[INFO] [stderr]     Checking ex10_cli_app v0.1.0 (/opt/rustwide/workdir/exercises/10-cli-app)
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]  --> exercises/04-traits-generics/src/lib.rs:5:35
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn describe_all<T: Summarize>(items: &[T]) -> String {
[INFO] [stdout]   |                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex02_ownership_borrowing v0.1.0 (/opt/rustwide/workdir/exercises/02-ownership-borrowing)
[INFO] [stdout] warning: unused variable: `notes`
[INFO] [stdout]  --> exercises/12-db-sqlx/src/lib.rs:4:25
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn in_memory_insert(notes: &mut Vec<Note>, title: &str) -> i64 {
[INFO] [stdout]   |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_notes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `title`
[INFO] [stdout]  --> exercises/12-db-sqlx/src/lib.rs:4:48
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn in_memory_insert(notes: &mut Vec<Note>, title: &str) -> i64 {
[INFO] [stdout]   |                                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_title`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex06_collections_iterators v0.1.0 (/opt/rustwide/workdir/exercises/06-collections-iterators)
[INFO] [stdout] warning: unused variable: `query`
[INFO] [stdout]  --> exercises/10-cli-app/src/lib.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn grep_in_memory(query: &str, haystack: &str) -> Vec<(usize, String)> {
[INFO] [stdout]   |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_query`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `haystack`
[INFO] [stdout]  --> exercises/10-cli-app/src/lib.rs:1:36
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn grep_in_memory(query: &str, haystack: &str) -> Vec<(usize, String)> {
[INFO] [stdout]   |                                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_haystack`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex09_async v0.1.0 (/opt/rustwide/workdir/exercises/09-async)
[INFO] [stderr]     Checking ex11_web_axum v0.1.0 (/opt/rustwide/workdir/exercises/11-web-axum)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/02-ownership-borrowing/src/lib.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn retain_even(v: &mut Vec<i32>) {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:11:23
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn first_word<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:17:19
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_suffix(name: &mut String, suffix: &str) {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `suffix`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_suffix(name: &mut String, suffix: &str) {
[INFO] [stdout]    |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_suffix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:3:18
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn word_freq(input: &str) -> HashMap<String, usize> {
[INFO] [stdout]   |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn dedup_sorted(mut v: Vec<i32>) -> Vec<i32> {
[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: `v`
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn dedup_sorted(mut v: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]   |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking clap_builder v4.5.47
[INFO] [stderr]     Checking ex16_performance_profiling v0.1.0 (/opt/rustwide/workdir/exercises/16-performance-profiling)
[INFO] [stdout] warning: unused variable: `ms`
[INFO] [stdout]  --> exercises/09-async/src/lib.rs:1:27
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub async fn double_after(ms: u64, n: i32) -> i32 {
[INFO] [stdout]   |                           ^^ help: if this is intentional, prefix it with an underscore: `_ms`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex15_macros_proc v0.1.0 (/opt/rustwide/workdir/exercises/15-macros-proc)
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> exercises/09-async/src/lib.rs:1:36
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub async fn double_after(ms: u64, n: i32) -> i32 {
[INFO] [stdout]   |                                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex08_concurrency_threads v0.1.0 (/opt/rustwide/workdir/exercises/08-concurrency-threads)
[INFO] [stderr]     Checking ex07_lifetimes v0.1.0 (/opt/rustwide/workdir/exercises/07-lifetimes)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/16-performance-profiling/src/lib.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sum_squares(v: &[u64]) -> u64 {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex01_basics v0.1.0 (/opt/rustwide/workdir/exercises/01-basics)
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ex03_structs_enums v0.1.0 (/opt/rustwide/workdir/exercises/03-structs-enums-patterns)
[INFO] [stderr]     Checking ex14_ffi_unsafe v0.1.0 (/opt/rustwide/workdir/exercises/14-ffi-unsafe)
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn parallel_sum(v: &[i64], chunks: usize) -> i64 {
[INFO] [stdout]   |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunks`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn parallel_sum(v: &[i64], chunks: usize) -> i64 {
[INFO] [stdout]   |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_chunks`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stderr]     Checking ex13_testing_benchmarking v0.1.0 (/opt/rustwide/workdir/exercises/13-testing-benchmarking)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> exercises/07-lifetimes/src/lib.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> exercises/07-lifetimes/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]   |                                ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nums`
[INFO] [stdout]  --> exercises/01-basics/src/lib.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sum_odds(nums: &[i64]) -> i64 {
[INFO] [stdout]   |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> exercises/01-basics/src/lib.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn fizzbuzz(n: u32) -> String {
[INFO] [stdout]   |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> exercises/01-basics/src/lib.rs:13:18
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn parse_u32(s: &str) -> Result<u32, std::num::ParseIntError> {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> exercises/13-testing-benchmarking/src/lib.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn hot_path(input: &str) -> String {
[INFO] [stdout]   |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> exercises/14-ffi-unsafe/src/lib.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub unsafe fn add_ptr(a: *const i32, b: *const i32) -> i32 {
[INFO] [stdout]   |                       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> exercises/14-ffi-unsafe/src/lib.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub unsafe fn add_ptr(a: *const i32, b: *const i32) -> i32 {
[INFO] [stdout]   |                                      ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking indexmap v2.11.1
[INFO] [stderr]     Checking capstone_cli v0.1.0 (/opt/rustwide/workdir/exercises/20-capstone/cli)
[INFO] [stderr]     Checking capstone_service v0.1.0 (/opt/rustwide/workdir/exercises/20-capstone/service)
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::thread;
[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 variable: `v`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn parallel_sum(v: &[i64], chunks: usize) -> i64 {
[INFO] [stdout]   |                     ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chunks`
[INFO] [stdout]  --> exercises/08-concurrency-threads/src/lib.rs:3:32
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn parallel_sum(v: &[i64], chunks: usize) -> i64 {
[INFO] [stdout]   |                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_chunks`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/02-ownership-borrowing/src/lib.rs:4:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn retain_even(v: &mut Vec<i32>) {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:11:23
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn first_word<'a>(s: &'a str) -> &'a str {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:17:19
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_suffix(name: &mut String, suffix: &str) {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `suffix`
[INFO] [stdout]   --> exercises/02-ownership-borrowing/src/lib.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub fn add_suffix(name: &mut String, suffix: &str) {
[INFO] [stdout]    |                                      ^^^^^^ help: if this is intentional, prefix it with an underscore: `_suffix`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> exercises/07-lifetimes/src/lib.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> exercises/07-lifetimes/src/lib.rs:1:32
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]   |                                ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]  --> exercises/04-traits-generics/src/lib.rs:5:35
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn describe_all<T: Summarize>(items: &[T]) -> String {
[INFO] [stdout]   |                                   ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> exercises/14-ffi-unsafe/src/lib.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub unsafe fn add_ptr(a: *const i32, b: *const i32) -> i32 {
[INFO] [stdout]   |                       ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> exercises/14-ffi-unsafe/src/lib.rs:1:38
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub unsafe fn add_ptr(a: *const i32, b: *const i32) -> i32 {
[INFO] [stdout]   |                                      ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `query`
[INFO] [stdout]  --> exercises/10-cli-app/src/lib.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn grep_in_memory(query: &str, haystack: &str) -> Vec<(usize, String)> {
[INFO] [stdout]   |                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_query`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `haystack`
[INFO] [stdout]  --> exercises/10-cli-app/src/lib.rs:1:36
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn grep_in_memory(query: &str, haystack: &str) -> Vec<(usize, String)> {
[INFO] [stdout]   |                                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_haystack`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/16-performance-profiling/src/lib.rs:1:20
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn sum_squares(v: &[u64]) -> u64 {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `notes`
[INFO] [stdout]  --> exercises/12-db-sqlx/src/lib.rs:4:25
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn in_memory_insert(notes: &mut Vec<Note>, title: &str) -> i64 {
[INFO] [stdout]   |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_notes`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `title`
[INFO] [stdout]  --> exercises/12-db-sqlx/src/lib.rs:4:48
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn in_memory_insert(notes: &mut Vec<Note>, title: &str) -> i64 {
[INFO] [stdout]   |                                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_title`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking regex-automata v0.4.10
[INFO] [stderr]     Checking tempfile v3.22.0
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking proptest v1.7.0
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling clap_derive v4.5.47
[INFO] [stderr]     Checking globset v0.4.16
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking thiserror v1.0.69
[INFO] [stderr]     Checking ex05_error_handling v0.1.0 (/opt/rustwide/workdir/exercises/05-error-handling)
[INFO] [stderr]     Checking insta v1.43.2
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]   --> exercises/05-error-handling/src/lib.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn load_config(env: &std::collections::HashMap<String,String>) -> Result<Config, ConfigError> {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]   --> exercises/05-error-handling/src/lib.rs:12:20
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn load_config(env: &std::collections::HashMap<String,String>) -> Result<Config, ConfigError> {
[INFO] [stdout]    |                    ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking clap v4.5.47
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> exercises/13-testing-benchmarking/src/lib.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn hot_path(input: &str) -> String {
[INFO] [stdout]   |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nums`
[INFO] [stdout]  --> exercises/01-basics/src/lib.rs:3:17
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn sum_odds(nums: &[i64]) -> i64 {
[INFO] [stdout]   |                 ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:3:18
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn word_freq(input: &str) -> HashMap<String, usize> {
[INFO] [stdout]   |                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> exercises/01-basics/src/lib.rs:8:17
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn fizzbuzz(n: u32) -> String {
[INFO] [stdout]   |                 ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn dedup_sorted(mut v: Vec<i32>) -> Vec<i32> {
[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: `v`
[INFO] [stdout]  --> exercises/06-collections-iterators/src/lib.rs:8:21
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn dedup_sorted(mut v: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]   |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> exercises/01-basics/src/lib.rs:13:18
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn parse_u32(s: &str) -> Result<u32, std::num::ParseIntError> {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde v1.0.219
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stdout] warning: unused variable: `ms`
[INFO] [stdout]  --> exercises/09-async/src/lib.rs:1:27
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub async fn double_after(ms: u64, n: i32) -> i32 {
[INFO] [stdout]   |                           ^^ help: if this is intentional, prefix it with an underscore: `_ms`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> exercises/09-async/src/lib.rs:1:36
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub async fn double_after(ms: u64, n: i32) -> i32 {
[INFO] [stdout]   |                                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_spanned v0.6.9
[INFO] [stderr]     Checking toml_datetime v0.6.11
[INFO] [stderr]     Checking serde_json v1.0.143
[INFO] [stderr]     Checking toml_edit v0.22.27
[INFO] [stderr]     Checking toml v0.8.23
[INFO] [stderr]     Checking learn v0.1.0 (/opt/rustwide/workdir/learn)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.15s
[INFO] running `Command { std: "docker" "inspect" "4bd52c853e77886fed4e25652f75980bc674692c62ad8431f997e939fb83a032", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bd52c853e77886fed4e25652f75980bc674692c62ad8431f997e939fb83a032", kill_on_drop: false }`
[INFO] [stdout] 4bd52c853e77886fed4e25652f75980bc674692c62ad8431f997e939fb83a032
