[INFO] cloning repository https://github.com/Nemit0/learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nemit0/learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNemit0%2Flearn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNemit0%2Flearn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c01312d5a03c96823b9410dab1f6a96786ff03c5
[INFO] testing Nemit0/learn-rust against master#0d162b25edd5bf0dba9a22e83b614f1113e90474 for pr-150681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNemit0%2Flearn-rust" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Nemit0/learn-rust
[INFO] finished tweaking git repo https://github.com/Nemit0/learn-rust
[INFO] tweaked toml for git repo https://github.com/Nemit0/learn-rust written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Nemit0/learn-rust on toolchain 0d162b25edd5bf0dba9a22e83b614f1113e90474
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Nemit0/learn-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6839586cc7e1fe23d5b8e956745f2ece46712063a6caadc4ebec776f5d407b43
[INFO] running `Command { std: "docker" "start" "-a" "6839586cc7e1fe23d5b8e956745f2ece46712063a6caadc4ebec776f5d407b43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6839586cc7e1fe23d5b8e956745f2ece46712063a6caadc4ebec776f5d407b43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6839586cc7e1fe23d5b8e956745f2ece46712063a6caadc4ebec776f5d407b43", kill_on_drop: false }`
[INFO] [stdout] 6839586cc7e1fe23d5b8e956745f2ece46712063a6caadc4ebec776f5d407b43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6be5d5d9da67690378700495006292ab69669bb2a26d13f728370ca07f783e64
[INFO] running `Command { std: "docker" "start" "-a" "6be5d5d9da67690378700495006292ab69669bb2a26d13f728370ca07f783e64", kill_on_drop: false }`
[INFO] [stderr]    Compiling lesson01_section06_methods_traits_generics v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-06-methods-traits-generics)
[INFO] [stderr]    Compiling lesson01_section05_data_types_pattern_matching v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-05-data-types-pattern-matching)
[INFO] [stderr]    Compiling lesson02_section02_concurrency v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-02-concurrency)
[INFO] [stderr]    Compiling lesson02_section03_iterators_advanced v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-03-iterators-advanced)
[INFO] [stderr]    Compiling lesson03_section01_unsafe_basics v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-01-unsafe-basics)
[INFO] [stderr]    Compiling lesson02_section01_smart_pointers v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-01-smart-pointers)
[INFO] [stderr]    Compiling lesson03_section02_advanced_macros v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-02-advanced-macros)
[INFO] [stderr]    Compiling lesson01_section04_ownership_borrowing v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-04-ownership-borrowing)
[INFO] [stderr]    Compiling lesson01_section07_collections_iterators v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-07-collections-iterators)
[INFO] [stderr]    Compiling lesson01_section02_functions v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-02-functions)
[INFO] [stderr]    Compiling lesson01_section08_error_handling v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-08-error-handling)
[INFO] [stderr]    Compiling lesson01_section09_modules_workspaces v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-09-modules-workspaces)
[INFO] [stderr]    Compiling lesson01_section03_control_flow v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-03-control-flow)
[INFO] [stderr]    Compiling lesson01_section01_variables v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables)
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:18:28
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[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]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:30
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:36
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stdout]    |                                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `curr`, `next`, and `remaining` are never read
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-03-iterators-advanced/src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Fibonacci {
[INFO] [stdout]   |            --------- fields in this struct
[INFO] [stdout] 7 |     curr: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     next: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 9 |     remaining: usize,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Fibonacci` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-02-concurrency/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | 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 import: `std::slice`
[INFO] [stdout]  --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::slice;
[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: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn sum_slice_unsafe(xs: &[i32]) -> i32 {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:29
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                             ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mid`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:45
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:24
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:16
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:19:18
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn shout(s: &str) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-01-variables/src/lib.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn double(x: i32) -> i32 {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[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]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:11:21
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn weekday_from(n: u8) -> Option<Weekday> {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn quadrant(p: Point) -> &'static str {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:25
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:22
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[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]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:31
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]   |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:14:20
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn to_positive(n: i32) -> Result<u32, String> {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn first_or_err(xs: &[i32]) -> Result<i32, String> {
[INFO] [stdout]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:24
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `suffix`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:40
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &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: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:12:19
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn first_char(s: &str) -> Option<char> {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:19
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:31
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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]  --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn square_all(nums: &[i32]) -> Vec<i32> {
[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: `nums`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn sum_of_evens(nums: &[i32]) -> i32 {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn word_counts(text: &str) -> HashMap<String, usize> {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn is_even(n: i32) -> bool {
[INFO] [stdout]   |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[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]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn fizz_buzz(n: i32) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:22:18
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn sum_up_to(n: u32) -> u32 {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn greet(name: &str) -> String {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "6be5d5d9da67690378700495006292ab69669bb2a26d13f728370ca07f783e64", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6be5d5d9da67690378700495006292ab69669bb2a26d13f728370ca07f783e64", kill_on_drop: false }`
[INFO] [stdout] 6be5d5d9da67690378700495006292ab69669bb2a26d13f728370ca07f783e64
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c7f8f0ede674b18dfd2f0389a9f4a2369c8b75380b7b5976d52b73ffe63c4bea
[INFO] running `Command { std: "docker" "start" "-a" "c7f8f0ede674b18dfd2f0389a9f4a2369c8b75380b7b5976d52b73ffe63c4bea", kill_on_drop: false }`
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-02-concurrency/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | 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: `x`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-01-variables/src/lib.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn double(x: i32) -> i32 {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `curr`, `next`, and `remaining` are never read
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-03-iterators-advanced/src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Fibonacci {
[INFO] [stdout]   |            --------- fields in this struct
[INFO] [stdout] 7 |     curr: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     next: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 9 |     remaining: usize,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Fibonacci` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice`
[INFO] [stdout]  --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::slice;
[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: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn sum_slice_unsafe(xs: &[i32]) -> i32 {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:29
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                             ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mid`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:45
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:24
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `suffix`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:40
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &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: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:12:19
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn first_char(s: &str) -> Option<char> {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:19
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:31
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:24
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:16
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:19:18
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn shout(s: &str) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn greet(name: &str) -> String {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:18:28
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[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]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:30
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:36
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[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]  --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn square_all(nums: &[i32]) -> Vec<i32> {
[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: `nums`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn sum_of_evens(nums: &[i32]) -> i32 {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn word_counts(text: &str) -> HashMap<String, usize> {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:11:21
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn weekday_from(n: u8) -> Option<Weekday> {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn quadrant(p: Point) -> &'static str {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:25
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn is_even(n: i32) -> bool {
[INFO] [stdout]   |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[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]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn fizz_buzz(n: i32) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lesson02_section02_concurrency v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-02-concurrency)
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:22:18
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn sum_up_to(n: u32) -> u32 {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lesson01_section09_modules_workspaces v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-09-modules-workspaces)
[INFO] [stderr]    Compiling lesson02_section03_iterators_advanced v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-03-iterators-advanced)
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:22
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[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]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:31
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]   |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:14:20
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn to_positive(n: i32) -> Result<u32, String> {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn first_or_err(xs: &[i32]) -> Result<i32, String> {
[INFO] [stdout]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lesson03_section01_unsafe_basics v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-01-unsafe-basics)
[INFO] [stderr]    Compiling lesson03_section02_advanced_macros v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-02-advanced-macros)
[INFO] [stderr]    Compiling lesson01_section04_ownership_borrowing v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-04-ownership-borrowing)
[INFO] [stderr]    Compiling lesson01_section05_data_types_pattern_matching v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-05-data-types-pattern-matching)
[INFO] [stderr]    Compiling lesson01_section01_variables v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables)
[INFO] [stderr]    Compiling lesson01_section02_functions v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-02-functions)
[INFO] [stderr]    Compiling lesson01_section06_methods_traits_generics v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-06-methods-traits-generics)
[INFO] [stderr]    Compiling lesson01_section08_error_handling v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-08-error-handling)
[INFO] [stderr]    Compiling lesson01_section03_control_flow v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-03-control-flow)
[INFO] [stderr]    Compiling lesson02_section01_smart_pointers v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-01-smart-pointers)
[INFO] [stderr]    Compiling lesson01_section07_collections_iterators v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-07-collections-iterators)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-07-collections-iterators/tests/basic.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | 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: unused variable: `s`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:24
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `suffix`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:40
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn append_in_place(s: &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: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:12:19
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn first_char(s: &str) -> Option<char> {
[INFO] [stdout]    |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:19
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:31
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn longer<'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: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:16
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:24
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:16
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:19:18
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn shout(s: &str) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::slice`
[INFO] [stdout]  --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::slice;
[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: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn sum_slice_unsafe(xs: &[i32]) -> i32 {
[INFO] [stdout]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:29
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                             ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mid`
[INFO] [stdout]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:45
[INFO] [stdout]    |
[INFO] [stdout] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stdout]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `other`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:18:28
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[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]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:30
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stdout]    |                              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:36
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stdout]    |                                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `curr`, `next`, and `remaining` are never read
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-03-iterators-advanced/src/lib.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct Fibonacci {
[INFO] [stdout]   |            --------- fields in this struct
[INFO] [stdout] 7 |     curr: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 8 |     next: u64,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout] 9 |     remaining: usize,
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Fibonacci` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: 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]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:20
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]   |                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:12:14
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn greet(name: &str) -> String {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::thread`
[INFO] [stdout]  --> lectures/lesson-02-intermediate/section-02-concurrency/src/lib.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | 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: `x`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-01-variables/src/lib.rs:15:15
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn double(x: i32) -> i32 {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[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]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:22
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[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]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:31
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]   |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:14:20
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn to_positive(n: i32) -> Result<u32, String> {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn first_or_err(xs: &[i32]) -> Result<i32, String> {
[INFO] [stdout]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn is_even(n: i32) -> bool {
[INFO] [stdout]   |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[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]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:16:18
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn fizz_buzz(n: i32) -> String {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:22:18
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn sum_up_to(n: u32) -> u32 {
[INFO] [stdout]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nums`
[INFO] [stdout]  --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn square_all(nums: &[i32]) -> Vec<i32> {
[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: `nums`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:12:21
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn sum_of_evens(nums: &[i32]) -> i32 {
[INFO] [stdout]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `text`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn word_counts(text: &str) -> HashMap<String, usize> {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:11:21
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn weekday_from(n: u8) -> Option<Weekday> {
[INFO] [stdout]    |                     ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:22:17
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub fn quadrant(p: Point) -> &'static str {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:17
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:25
[INFO] [stdout]    |
[INFO] [stdout] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.03s
[INFO] running `Command { std: "docker" "inspect" "c7f8f0ede674b18dfd2f0389a9f4a2369c8b75380b7b5976d52b73ffe63c4bea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7f8f0ede674b18dfd2f0389a9f4a2369c8b75380b7b5976d52b73ffe63c4bea", kill_on_drop: false }`
[INFO] [stdout] c7f8f0ede674b18dfd2f0389a9f4a2369c8b75380b7b5976d52b73ffe63c4bea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 1f8d1ff8d93d70fd4676f56191cb7e101446cc8f98083d90dd0e0913887deb94
[INFO] running `Command { std: "docker" "start" "-a" "1f8d1ff8d93d70fd4676f56191cb7e101446cc8f98083d90dd0e0913887deb94", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> lectures/lesson-02-intermediate/section-02-concurrency/src/lib.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::thread;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `lesson02_section02_concurrency` (lib) generated 1 warning (run `cargo fix --lib -p lesson02_section02_concurrency` to apply 1 suggestion)
[INFO] [stderr] warning: fields `curr`, `next`, and `remaining` are never read
[INFO] [stderr]  --> lectures/lesson-02-intermediate/section-03-iterators-advanced/src/lib.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Fibonacci {
[INFO] [stderr]   |            --------- fields in this struct
[INFO] [stderr] 7 |     curr: u64,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 8 |     next: u64,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr] 9 |     remaining: usize,
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `Fibonacci` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:11:21
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub fn weekday_from(n: u8) -> Option<Weekday> {
[INFO] [stderr]    |                     ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `p`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:22:17
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub fn quadrant(p: Point) -> &'static str {
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:17
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stderr]    |                 ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-05-data-types-pattern-matching/src/lib.rs:28:25
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub fn safe_div(a: i32, b: i32) -> Option<i32> {
[INFO] [stderr]    |                         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::slice`
[INFO] [stderr]  --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::slice;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `xs`
[INFO] [stderr]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:23:25
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub fn sum_slice_unsafe(xs: &[i32]) -> i32 {
[INFO] [stderr]    |                         ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `xs`
[INFO] [stderr]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:29
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stderr]    |                             ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `mid`
[INFO] [stderr]   --> lectures/lesson-03-advanced/section-01-unsafe-basics/src/lib.rs:30:45
[INFO] [stderr]    |
[INFO] [stderr] 30 | pub fn split_at_mut_via_ptr(xs: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
[INFO] [stderr]    |                                             ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:18:28
[INFO] [stderr]    |
[INFO] [stderr] 18 |     pub fn can_hold(&self, other: &Rectangle) -> bool {
[INFO] [stderr]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_other`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:30
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stderr]    |                              ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-06-methods-traits-generics/src/lib.rs:39:36
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn max_of<T: Ord + Copy>(a: T, b: T) -> T {
[INFO] [stderr]    |                                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `nums`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:6:19
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn square_all(nums: &[i32]) -> Vec<i32> {
[INFO] [stderr]   |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `nums`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:12:21
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn sum_of_evens(nums: &[i32]) -> i32 {
[INFO] [stderr]    |                     ^^^^ help: if this is intentional, prefix it with an underscore: `_nums`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `text`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-07-collections-iterators/src/lib.rs:20:20
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn word_counts(text: &str) -> HashMap<String, usize> {
[INFO] [stderr]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_text`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:16
[INFO] [stderr]   |
[INFO] [stderr] 7 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stderr]   |                ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] running 0 tests
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stdout] 
[INFO] [stderr]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:24
[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] 7 |     pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout] 
[INFO] [stderr]   |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] running 2 tests
[INFO] [stderr] 
[INFO] [stdout] test doubles_numbers ... FAILED
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout] test returns_ten ... FAILED
[INFO] [stderr]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:16
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] failures:
[INFO] [stderr] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout] 
[INFO] [stderr]    |                ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] ---- doubles_numbers stdout ----
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stdout] thread 'doubles_numbers' (26) panicked at lectures/lesson-01-basics/section-01-variables/src/lib.rs:17:5:
[INFO] [stderr]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:24
[INFO] [stdout] not implemented: Return 2 * x
[INFO] [stderr]    |
[INFO] [stdout] stack backtrace:
[INFO] [stderr] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stdout]    0:     0x5670ba3f7182 - std[3b51380354919863]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr] 
[INFO] [stdout]    1:     0x5670ba3f7182 - std[3b51380354919863]::backtrace_rs::backtrace::trace_unsynchronized::<std[3b51380354919863]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:19:18
[INFO] [stdout]    2:     0x5670ba3f7182 - std[3b51380354919863]::sys::backtrace::_print_fmt
[INFO] [stderr]    |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr] 19 |     pub fn shout(s: &str) -> String {
[INFO] [stdout]    3:     0x5670ba3f7182 - <<std[3b51380354919863]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[27de1724e4349be2]::fmt::Display>::fmt
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr] 
[INFO] [stdout]    4:     0x5670ba40b98a - <core[27de1724e4349be2]::fmt::rt::Argument>::fmt
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:12
[INFO] [stdout]    5:     0x5670ba40b98a - core[27de1724e4349be2]::fmt::write
[INFO] [stderr]   |
[INFO] [stdout]    6:     0x5670ba3fbf86 - std[3b51380354919863]::io::default_write_fmt::<alloc[a57f19327c0ad893]::vec::Vec<u8>>
[INFO] [stderr] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:639:11
[INFO] [stderr]   |            ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    7:     0x5670ba3fbf86 - <alloc[a57f19327c0ad893]::vec::Vec<u8> as std[3b51380354919863]::io::Write>::write_fmt
[INFO] [stderr]   |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:1994:13
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]    8:     0x5670ba3d591f - <std[3b51380354919863]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stdout]    9:     0x5670ba3d591f - std[3b51380354919863]::panicking::default_hook::{closure#0}
[INFO] [stderr]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:20
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:292:27
[INFO] [stderr]   |
[INFO] [stdout]   10:     0x5670ba3ef469 - std[3b51380354919863]::panicking::default_hook
[INFO] [stderr] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:316:9
[INFO] [stderr]   |                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   11:     0x5670ba38ae6e - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stdout]   12:     0x5670ba38ae6e - test[182b2e79ecd7bbd9]::test_main_with_exit_callback::<test[182b2e79ecd7bbd9]::test_main::{closure#0}>::{closure#0}
[INFO] [stderr]   --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:12:14
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:145:21
[INFO] [stderr]    |
[INFO] [stdout]   13:     0x5670ba3ef622 - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stderr] 12 | pub fn greet(name: &str) -> String {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stderr]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]   14:     0x5670ba3ef622 - std[3b51380354919863]::panicking::panic_with_hook
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:833:13
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stdout]   15:     0x5670ba3d5a0a - std[3b51380354919863]::panicking::panic_handler::{closure#0}
[INFO] [stderr]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:24
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:691:13
[INFO] [stderr]   |
[INFO] [stdout]   16:     0x5670ba3cac59 - std[3b51380354919863]::sys::backtrace::__rust_end_short_backtrace::<std[3b51380354919863]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]   |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   17:     0x5670ba3d682d - __rustc[d79c0ace40940972]::rust_begin_unwind
[INFO] [stderr]   |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:689:5
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]   18:     0x5670ba40bffc - core[27de1724e4349be2]::panicking::panic_fmt
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:80:14
[INFO] [stderr] warning: unused variable: `suffix`
[INFO] [stdout]   19:     0x5670ba3bdee9 - lesson01_section01_variables[aad4c10016e145c1]::double
[INFO] [stderr]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:40
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/src/lib.rs:17:5
[INFO] [stderr]   |
[INFO] [stdout]   20:     0x5670ba37e86f - basic[d9dbbf3ce5c8770e]::doubles_numbers
[INFO] [stderr] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:10:16
[INFO] [stderr]   |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_suffix`
[INFO] [stdout]   21:     0x5670ba37e777 - basic[d9dbbf3ce5c8770e]::doubles_numbers::{closure#0}
[INFO] [stderr] 
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:9:21
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stdout]   22:     0x5670ba37f146 - <basic[d9dbbf3ce5c8770e]::doubles_numbers::{closure#0} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:12:19
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stderr]    |
[INFO] [stdout]   23:     0x5670ba37f21b - <fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr] 12 | pub fn first_char(s: &str) -> Option<char> {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stderr]    |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]   24:     0x5670ba37f21b - test[182b2e79ecd7bbd9]::__rust_begin_short_backtrace::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:663:18
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout]   25:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}
[INFO] [stderr]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:19
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:74
[INFO] [stderr]    |
[INFO] [stdout]   26:     0x5670ba38ba7a - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr] 20 | pub fn longer<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stderr]    |                   ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   27:     0x5670ba38ba7a - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stdout]   28:     0x5670ba38ba7a - std[3b51380354919863]::panicking::catch_unwind::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>>
[INFO] [stderr]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:31
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stderr]    |
[INFO] [stdout]   29:     0x5670ba38ba7a - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stderr] 20 | pub fn longer<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stderr]    |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   30:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test_in_process
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:27
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stdout]   31:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test::{closure#0}
[INFO] [stderr]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:22
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:607:43
[INFO] [stderr]   |
[INFO] [stdout]   32:     0x5670ba387024 - test[182b2e79ecd7bbd9]::run_test::{closure#1}
[INFO] [stderr] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:637:41
[INFO] [stderr]   |                      ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]   33:     0x5670ba387024 - std[3b51380354919863]::sys::backtrace::__rust_begin_short_backtrace::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>
[INFO] [stderr]   |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:166:18
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]   34:     0x5670ba38e572 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stdout]   35:     0x5670ba38e572 - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:31
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stderr]   |
[INFO] [stdout]   36:     0x5670ba38e572 - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stderr] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stderr]   |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   37:     0x5670ba38e572 - std[3b51380354919863]::panicking::catch_unwind::<(), core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stdout]   38:     0x5670ba38e572 - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stderr]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:14:20
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stderr]    |
[INFO] [stdout]   39:     0x5670ba38e572 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stderr] 14 | pub fn to_positive(n: i32) -> Result<u32, String> {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stderr]    |                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]   40:     0x5670ba38e572 - <std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stderr] warning: unused variable: `xs`
[INFO] [stdout]   41:     0x5670ba3f6a2f - <alloc[a57f19327c0ad893]::boxed::Box<dyn core[27de1724e4349be2]::ops::function::FnOnce<(), Output = ()> + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:21:21
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2206:9
[INFO] [stderr]    |
[INFO] [stdout]   42:     0x5670ba3f6a2f - <std[3b51380354919863]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stderr] 21 | pub fn first_or_err(xs: &[i32]) -> Result<i32, String> {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/thread/unix.rs:119:17
[INFO] [stderr]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout]   43:     0x7ec156258aa4 - <unknown>
[INFO] [stderr] 
[INFO] [stdout]   44:     0x7ec1562e5a64 - clone
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stdout]   45:                0x0 - <unknown>
[INFO] [stderr]   --> lectures/lesson-01-basics/section-01-variables/src/lib.rs:15:15
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] ---- returns_ten stdout ----
[INFO] [stderr] 15 | pub fn double(x: i32) -> i32 {
[INFO] [stdout] 
[INFO] [stderr]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] thread 'returns_ten' (27) panicked at lectures/lesson-01-basics/section-01-variables/tests/basic.rs:5:5:
[INFO] [stderr]    |
[INFO] [stdout] assertion `left == right` failed
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]   left: 5
[INFO] [stderr] 
[INFO] [stdout]  right: 10
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stdout] stack backtrace:
[INFO] [stderr]  --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:6:16
[INFO] [stdout]    0:     0x5670ba3f7182 - std[3b51380354919863]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]   |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr] 6 | pub fn is_even(n: i32) -> bool {
[INFO] [stdout]    1:     0x5670ba3f7182 - std[3b51380354919863]::backtrace_rs::backtrace::trace_unsynchronized::<std[3b51380354919863]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr]   |                ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]   |
[INFO] [stdout]    2:     0x5670ba3f7182 - std[3b51380354919863]::sys::backtrace::_print_fmt
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr] 
[INFO] [stdout]    3:     0x5670ba3f7182 - <<std[3b51380354919863]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[27de1724e4349be2]::fmt::Display>::fmt
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:16:18
[INFO] [stdout]    4:     0x5670ba40b98a - <core[27de1724e4349be2]::fmt::rt::Argument>::fmt
[INFO] [stderr]    |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr] 16 | pub fn fizz_buzz(n: i32) -> String {
[INFO] [stdout]    5:     0x5670ba40b98a - core[27de1724e4349be2]::fmt::write
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    6:     0x5670ba3fbf86 - std[3b51380354919863]::io::default_write_fmt::<alloc[a57f19327c0ad893]::vec::Vec<u8>>
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:639:11
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stdout]    7:     0x5670ba3fbf86 - <alloc[a57f19327c0ad893]::vec::Vec<u8> as std[3b51380354919863]::io::Write>::write_fmt
[INFO] [stderr]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:22:18
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:1994:13
[INFO] [stderr]    |
[INFO] [stdout]    8:     0x5670ba3d591f - <std[3b51380354919863]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr] 22 | pub fn sum_up_to(n: u32) -> u32 {
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout]    9:     0x5670ba3d591f - std[3b51380354919863]::panicking::default_hook::{closure#0}
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:292:27
[INFO] [stderr] warning: `lesson02_section03_iterators_advanced` (lib) generated 1 warning
[INFO] [stdout]   10:     0x5670ba3ef469 - std[3b51380354919863]::panicking::default_hook
[INFO] [stderr] warning: `lesson01_section05_data_types_pattern_matching` (lib) generated 4 warnings (run `cargo fix --lib -p lesson01_section05_data_types_pattern_matching` to apply 4 suggestions)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:316:9
[INFO] [stderr] warning: `lesson03_section01_unsafe_basics` (lib) generated 4 warnings (run `cargo fix --lib -p lesson03_section01_unsafe_basics` to apply 4 suggestions)
[INFO] [stdout]   11:     0x5670ba38ae6e - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stderr] warning: `lesson01_section06_methods_traits_generics` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section06_methods_traits_generics` to apply 3 suggestions)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stderr] warning: `lesson01_section07_collections_iterators` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section07_collections_iterators` to apply 3 suggestions)
[INFO] [stdout]   12:     0x5670ba38ae6e - test[182b2e79ecd7bbd9]::test_main_with_exit_callback::<test[182b2e79ecd7bbd9]::test_main::{closure#0}>::{closure#0}
[INFO] [stderr] warning: `lesson01_section09_modules_workspaces` (lib) generated 5 warnings (run `cargo fix --lib -p lesson01_section09_modules_workspaces` to apply 5 suggestions)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:145:21
[INFO] [stderr] warning: `lesson01_section02_functions` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section02_functions` to apply 3 suggestions)
[INFO] [stdout]   13:     0x5670ba3ef622 - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stderr] warning: `lesson01_section04_ownership_borrowing` (lib) generated 5 warnings (run `cargo fix --lib -p lesson01_section04_ownership_borrowing` to apply 5 suggestions)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stderr] warning: `lesson01_section08_error_handling` (lib) generated 4 warnings (run `cargo fix --lib -p lesson01_section08_error_handling` to apply 4 suggestions)
[INFO] [stdout]   14:     0x5670ba3ef622 - std[3b51380354919863]::panicking::panic_with_hook
[INFO] [stderr] warning: `lesson01_section01_variables` (lib) generated 1 warning (run `cargo fix --lib -p lesson01_section01_variables` to apply 1 suggestion)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:833:13
[INFO] [stderr] warning: `lesson01_section03_control_flow` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section03_control_flow` to apply 3 suggestions)
[INFO] [stdout]   15:     0x5670ba3d59d8 - std[3b51380354919863]::panicking::panic_handler::{closure#0}
[INFO] [stderr] warning: `lesson01_section02_functions` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:698:13
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]   16:     0x5670ba3cac59 - std[3b51380354919863]::sys::backtrace::__rust_end_short_backtrace::<std[3b51380354919863]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr]  --> lectures/lesson-01-basics/section-07-collections-iterators/tests/basic.rs:2:5
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]   |
[INFO] [stdout]   17:     0x5670ba3d682d - __rustc[d79c0ace40940972]::rust_begin_unwind
[INFO] [stderr] 2 | use std::collections::HashMap;
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:689:5
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   18:     0x5670ba40bffc - core[27de1724e4349be2]::panicking::panic_fmt
[INFO] [stderr]   |
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:80:14
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]   19:     0x5670ba40bf13 - core[27de1724e4349be2]::panicking::assert_failed_inner
[INFO] [stderr] 
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:439:17
[INFO] [stderr] warning: `lesson01_section07_collections_iterators` (test "basic") generated 1 warning (run `cargo fix --test "basic" -p lesson01_section07_collections_iterators` to apply 1 suggestion)
[INFO] [stdout]   20:     0x5670ba3c9e75 - core[27de1724e4349be2]::panicking::assert_failed::<i32, i32>
[INFO] [stderr] warning: `lesson02_section03_iterators_advanced` (lib test) generated 1 warning (1 duplicate)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:394:5
[INFO] [stderr] warning: `lesson01_section07_collections_iterators` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stdout]   21:     0x5670ba37e854 - basic[d9dbbf3ce5c8770e]::returns_ten
[INFO] [stderr] warning: `lesson02_section02_concurrency` (lib test) generated 1 warning (1 duplicate)
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:5:5
[INFO] [stderr] warning: `lesson03_section01_unsafe_basics` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stdout]   22:     0x5670ba37e747 - basic[d9dbbf3ce5c8770e]::returns_ten::{closure#0}
[INFO] [stderr] warning: `lesson01_section01_variables` (lib test) generated 1 warning (1 duplicate)
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:4:17
[INFO] [stderr] warning: `lesson01_section08_error_handling` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stdout]   23:     0x5670ba37f106 - <basic[d9dbbf3ce5c8770e]::returns_ten::{closure#0} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr] warning: `lesson01_section09_modules_workspaces` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stderr] warning: `lesson01_section03_control_flow` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stdout]   24:     0x5670ba37f21b - <fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr] warning: `lesson01_section04_ownership_borrowing` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stderr] warning: `lesson01_section06_methods_traits_generics` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stdout]   25:     0x5670ba37f21b - test[182b2e79ecd7bbd9]::__rust_begin_short_backtrace::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stderr] warning: `lesson01_section05_data_types_pattern_matching` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:663:18
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stdout]   26:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/lesson01_section01_variables-302d88e0c7643d43)
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:74
[INFO] [stderr]      Running tests/basic.rs (/opt/rustwide/target/debug/deps/basic-85f4af37b19f1bbd)
[INFO] [stdout]   27:     0x5670ba38ba7a - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr] error: test failed, to rerun pass `-p lesson01_section01_variables --test basic`
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x5670ba38ba7a - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x5670ba38ba7a - std[3b51380354919863]::panicking::catch_unwind::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x5670ba38ba7a - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test_in_process
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x5670ba38ba7a - test[182b2e79ecd7bbd9]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x5670ba387024 - test[182b2e79ecd7bbd9]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x5670ba387024 - std[3b51380354919863]::sys::backtrace::__rust_begin_short_backtrace::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x5670ba38e572 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x5670ba38e572 - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x5670ba38e572 - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x5670ba38e572 - std[3b51380354919863]::panicking::catch_unwind::<(), core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x5670ba38e572 - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5670ba38e572 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x5670ba38e572 - <std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5670ba3f6a2f - <alloc[a57f19327c0ad893]::boxed::Box<dyn core[27de1724e4349be2]::ops::function::FnOnce<(), Output = ()> + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x5670ba3f6a2f - <std[3b51380354919863]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/thread/unix.rs:119:17
[INFO] [stdout]   44:     0x7ec156258aa4 - <unknown>
[INFO] [stdout]   45:     0x7ec1562e5a64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     doubles_numbers
[INFO] [stdout]     returns_ten
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1f8d1ff8d93d70fd4676f56191cb7e101446cc8f98083d90dd0e0913887deb94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f8d1ff8d93d70fd4676f56191cb7e101446cc8f98083d90dd0e0913887deb94", kill_on_drop: false }`
[INFO] [stdout] 1f8d1ff8d93d70fd4676f56191cb7e101446cc8f98083d90dd0e0913887deb94
