[INFO] cloning repository https://github.com/nickx720/systems_programming
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nickx720/systems_programming" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fsystems_programming", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fsystems_programming'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dee26357724b7f55cad4802a919fc23e9eb9dc10
[INFO] testing nickx720/systems_programming against beta-2025-10-28 for beta-1.92-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnickx720%2Fsystems_programming" "/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/nickx720/systems_programming
[INFO] finished tweaking git repo https://github.com/nickx720/systems_programming
[INFO] tweaked toml for git repo https://github.com/nickx720/systems_programming written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nickx720/systems_programming on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nickx720/systems_programming 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-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a32ce425caa7a051a08a793d9471fb1e324c82b818c2b1572700fc509e3607c8
[INFO] running `Command { std: "docker" "start" "-a" "a32ce425caa7a051a08a793d9471fb1e324c82b818c2b1572700fc509e3607c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a32ce425caa7a051a08a793d9471fb1e324c82b818c2b1572700fc509e3607c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a32ce425caa7a051a08a793d9471fb1e324c82b818c2b1572700fc509e3607c8", kill_on_drop: false }`
[INFO] [stdout] a32ce425caa7a051a08a793d9471fb1e324c82b818c2b1572700fc509e3607c8
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f83e29dd29f17f24713f2fc96d4671f6db1dd4c05c5a0f3434273d26375d704
[INFO] running `Command { std: "docker" "start" "-a" "2f83e29dd29f17f24713f2fc96d4671f6db1dd4c05c5a0f3434273d26375d704", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.135
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling num_cpus v1.13.1
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling systems_program v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `sample_shell::run_shell`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sample_shell::run_shell;
[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: `std::collections::VecDeque`
[INFO] [stdout]  --> src/excercies/lecture4/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `i32`
[INFO] [stdout]  --> src/excercies/lecture5/mod.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{i32, thread, time};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cow::cow_main`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cow::cow_main;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/excercies/lecture5/mod.rs:4:26
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn parallel_map<T, U, F>(mut input_vec: Vec<T>, num_threads: usize, f: F) -> Vec<U>
[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: `id`
[INFO] [stdout]   --> src/excercies/lecture5/mod.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     for id in 0..num_threads {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write_to_stdout` is never used
[INFO] [stdout]  --> src/sample_shell.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn write_to_stdout(text: &str) -> io::Result<()> {
[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 `get_user_command` is never used
[INFO] [stdout]   --> src/sample_shell.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn get_user_command() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_shell` is never used
[INFO] [stdout]   --> src/sample_shell.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn run_shell() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `linkedmain` is never used
[INFO] [stdout]  --> src/excercies/lecture3/linked_list/mod.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn linkedmain() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_input_numbers` is never used
[INFO] [stdout]   --> src/excercies/lecture4/mod.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn get_input_numbers() -> Vec<u32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factor_prime_main` is never used
[INFO] [stdout]   --> src/excercies/lecture4/mod.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn factor_prime_main() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/cow/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new_owned`, `new_borrowed`, `first_name`, and `last_name` are never used
[INFO] [stdout]   --> src/cow/mod.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl<'a> User<'a> {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new_owned(first_name: String, last_name: String) -> User<'static> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn new_borrowed(first_name: &'a str, last_name: &'a str) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn first_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn last_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove_whitespaces` is never used
[INFO] [stdout]   --> src/cow/mod.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cow_main` is never used
[INFO] [stdout]   --> src/cow/mod.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn cow_main() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/cow/mod.rs:31:26
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stdout]    |                          ^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<'_, str> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.20s
[INFO] running `Command { std: "docker" "inspect" "2f83e29dd29f17f24713f2fc96d4671f6db1dd4c05c5a0f3434273d26375d704", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f83e29dd29f17f24713f2fc96d4671f6db1dd4c05c5a0f3434273d26375d704", kill_on_drop: false }`
[INFO] [stdout] 2f83e29dd29f17f24713f2fc96d4671f6db1dd4c05c5a0f3434273d26375d704
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 515d67292c89aab459ad40a2e927a8eb10abae6a4f32699e084535fa67ef673f
[INFO] running `Command { std: "docker" "start" "-a" "515d67292c89aab459ad40a2e927a8eb10abae6a4f32699e084535fa67ef673f", kill_on_drop: false }`
[INFO] [stderr]    Compiling systems_program v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `sample_shell::run_shell`
[INFO] [stdout]  --> src/main.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sample_shell::run_shell;
[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: `std::collections::VecDeque`
[INFO] [stdout]  --> src/excercies/lecture4/mod.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::VecDeque;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `i32`
[INFO] [stdout]  --> src/excercies/lecture5/mod.rs:2:11
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{i32, thread, time};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cow::cow_main`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use cow::cow_main;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/excercies/lecture5/mod.rs:4:26
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn parallel_map<T, U, F>(mut input_vec: Vec<T>, num_threads: usize, f: F) -> Vec<U>
[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: `id`
[INFO] [stdout]   --> src/excercies/lecture5/mod.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     for id in 0..num_threads {
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `write_to_stdout` is never used
[INFO] [stdout]  --> src/sample_shell.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn write_to_stdout(text: &str) -> io::Result<()> {
[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 `get_user_command` is never used
[INFO] [stdout]   --> src/sample_shell.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn get_user_command() -> String {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_shell` is never used
[INFO] [stdout]   --> src/sample_shell.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | pub fn run_shell() {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `linkedmain` is never used
[INFO] [stdout]  --> src/excercies/lecture3/linked_list/mod.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn linkedmain() {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_input_numbers` is never used
[INFO] [stdout]   --> src/excercies/lecture4/mod.rs:49:4
[INFO] [stdout]    |
[INFO] [stdout] 49 | fn get_input_numbers() -> Vec<u32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `factor_prime_main` is never used
[INFO] [stdout]   --> src/excercies/lecture4/mod.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn factor_prime_main() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `User` is never constructed
[INFO] [stdout]  --> src/cow/mod.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct User<'a> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new_owned`, `new_borrowed`, `first_name`, and `last_name` are never used
[INFO] [stdout]   --> src/cow/mod.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout]  8 | impl<'a> User<'a> {
[INFO] [stdout]    | ----------------- associated items in this implementation
[INFO] [stdout]  9 |     pub fn new_owned(first_name: String, last_name: String) -> User<'static> {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     pub fn new_borrowed(first_name: &'a str, last_name: &'a str) -> Self {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 23 |     pub fn first_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 26 |     pub fn last_name(&self) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove_whitespaces` is never used
[INFO] [stdout]   --> src/cow/mod.rs:31:4
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `cow_main` is never used
[INFO] [stdout]   --> src/cow/mod.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn cow_main() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/cow/mod.rs:31:26
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stdout]    |                          ^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                          |
[INFO] [stdout]    |                          the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn remove_whitespaces(s: &str) -> Cow<'_, str> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "515d67292c89aab459ad40a2e927a8eb10abae6a4f32699e084535fa67ef673f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "515d67292c89aab459ad40a2e927a8eb10abae6a4f32699e084535fa67ef673f", kill_on_drop: false }`
[INFO] [stdout] 515d67292c89aab459ad40a2e927a8eb10abae6a4f32699e084535fa67ef673f
[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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f9bfdafc848eb8c57dc2d991c3c68536b23829d4c764756ad374699b54e9d848
[INFO] running `Command { std: "docker" "start" "-a" "f9bfdafc848eb8c57dc2d991c3c68536b23829d4c764756ad374699b54e9d848", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `sample_shell::run_shell`
[INFO] [stdout] 
[INFO] [stderr]  --> src/main.rs:2:5
[INFO] [stdout] running 0 tests
[INFO] [stderr]   |
[INFO] [stdout] 
[INFO] [stderr] 2 | use sample_shell::run_shell;
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::VecDeque`
[INFO] [stderr]  --> src/excercies/lecture4/mod.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::collections::VecDeque;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `i32`
[INFO] [stderr]  --> src/excercies/lecture5/mod.rs:2:11
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{i32, thread, time};
[INFO] [stderr]   |           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `cow::cow_main`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use cow::cow_main;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/excercies/lecture5/mod.rs:4:26
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn parallel_map<T, U, F>(mut input_vec: Vec<T>, num_threads: usize, f: F) -> Vec<U>
[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: `id`
[INFO] [stderr]   --> src/excercies/lecture5/mod.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     for id in 0..num_threads {
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_id`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `write_to_stdout` is never used
[INFO] [stderr]  --> src/sample_shell.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn write_to_stdout(text: &str) -> io::Result<()> {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `get_user_command` is never used
[INFO] [stderr]   --> src/sample_shell.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn get_user_command() -> String {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `run_shell` is never used
[INFO] [stderr]   --> src/sample_shell.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 | pub fn run_shell() {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `linkedmain` is never used
[INFO] [stderr]  --> src/excercies/lecture3/linked_list/mod.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn linkedmain() {
[INFO] [stderr]   |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `get_input_numbers` is never used
[INFO] [stderr]   --> src/excercies/lecture4/mod.rs:49:4
[INFO] [stderr]    |
[INFO] [stderr] 49 | fn get_input_numbers() -> Vec<u32> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `factor_prime_main` is never used
[INFO] [stderr]   --> src/excercies/lecture4/mod.rs:57:8
[INFO] [stderr]    |
[INFO] [stderr] 57 | pub fn factor_prime_main() {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `User` is never constructed
[INFO] [stderr]  --> src/cow/mod.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct User<'a> {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new_owned`, `new_borrowed`, `first_name`, and `last_name` are never used
[INFO] [stderr]   --> src/cow/mod.rs:9:12
[INFO] [stderr]    |
[INFO] [stderr]  8 | impl<'a> User<'a> {
[INFO] [stderr]    | ----------------- associated items in this implementation
[INFO] [stderr]  9 |     pub fn new_owned(first_name: String, last_name: String) -> User<'static> {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 16 |     pub fn new_borrowed(first_name: &'a str, last_name: &'a str) -> Self {
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 23 |     pub fn first_name(&self) -> &str {
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 26 |     pub fn last_name(&self) -> &str {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `remove_whitespaces` is never used
[INFO] [stderr]   --> src/cow/mod.rs:31:4
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `cow_main` is never used
[INFO] [stderr]   --> src/cow/mod.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn cow_main() {
[INFO] [stderr]    |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]   --> src/cow/mod.rs:31:26
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn remove_whitespaces(s: &str) -> Cow<str> {
[INFO] [stderr]    |                          ^^^^     ^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]    |                          |
[INFO] [stderr]    |                          the lifetime is elided here
[INFO] [stderr]    |
[INFO] [stderr]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]    |
[INFO] [stderr] 31 | fn remove_whitespaces(s: &str) -> Cow<'_, str> {
[INFO] [stderr]    |                                       +++
[INFO] [stderr] 
[INFO] [stderr] warning: `systems_program` (bin "systems_program" test) generated 17 warnings (run `cargo fix --bin "systems_program" -p systems_program --tests` to apply 7 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/systems_program-97b9c6323ed1dc71)
[INFO] running `Command { std: "docker" "inspect" "f9bfdafc848eb8c57dc2d991c3c68536b23829d4c764756ad374699b54e9d848", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9bfdafc848eb8c57dc2d991c3c68536b23829d4c764756ad374699b54e9d848", kill_on_drop: false }`
[INFO] [stdout] f9bfdafc848eb8c57dc2d991c3c68536b23829d4c764756ad374699b54e9d848