[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 1.93.0 for beta-1.94-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNemit0%2Flearn-rust" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-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-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Nemit0/learn-rust on toolchain 1.93.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.93.0" "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" "+1.93.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 202df4ad2fd6a3b977ab4eac66a1311f2cbc07acdcbc498f2b01de653ff932dd
[INFO] running `Command { std: "docker" "start" "-a" "202df4ad2fd6a3b977ab4eac66a1311f2cbc07acdcbc498f2b01de653ff932dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "202df4ad2fd6a3b977ab4eac66a1311f2cbc07acdcbc498f2b01de653ff932dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "202df4ad2fd6a3b977ab4eac66a1311f2cbc07acdcbc498f2b01de653ff932dd", kill_on_drop: false }`
[INFO] [stdout] 202df4ad2fd6a3b977ab4eac66a1311f2cbc07acdcbc498f2b01de653ff932dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d31f5846146db8346f24419edbe112175c5440d877ce3b5ea6c44fe390e687d3
[INFO] running `Command { std: "docker" "start" "-a" "d31f5846146db8346f24419edbe112175c5440d877ce3b5ea6c44fe390e687d3", 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_section02_functions v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-02-functions)
[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_section04_ownership_borrowing v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-04-ownership-borrowing)
[INFO] [stderr]    Compiling lesson01_section01_variables v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables)
[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_section08_error_handling v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-08-error-handling)
[INFO] [stderr]    Compiling lesson02_section01_smart_pointers v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-01-smart-pointers)
[INFO] [stderr]    Compiling lesson02_section02_concurrency v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-02-concurrency)
[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 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 lesson02_section03_iterators_advanced v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-03-iterators-advanced)
[INFO] [stderr]    Compiling lesson01_section09_modules_workspaces v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-09-modules-workspaces)
[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-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 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: `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: `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: `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-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 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-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" "d31f5846146db8346f24419edbe112175c5440d877ce3b5ea6c44fe390e687d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d31f5846146db8346f24419edbe112175c5440d877ce3b5ea6c44fe390e687d3", kill_on_drop: false }`
[INFO] [stdout] d31f5846146db8346f24419edbe112175c5440d877ce3b5ea6c44fe390e687d3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84622ae52b43a2f96433e5f1c249300806c32a2f32bf8fee29715f9c41411ee8
[INFO] running `Command { std: "docker" "start" "-a" "84622ae52b43a2f96433e5f1c249300806c32a2f32bf8fee29715f9c41411ee8", kill_on_drop: false }`
[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-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-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-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: 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: `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: `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: `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: `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 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] [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] [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] [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 lesson03_section01_unsafe_basics v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-01-unsafe-basics)
[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_section09_modules_workspaces v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-09-modules-workspaces)
[INFO] [stderr]    Compiling lesson01_section02_functions v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-02-functions)
[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 lesson02_section01_smart_pointers v0.1.0 (/opt/rustwide/workdir/lectures/lesson-02-intermediate/section-01-smart-pointers)
[INFO] [stderr]    Compiling lesson01_section01_variables v0.1.0 (/opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables)
[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_section02_advanced_macros v0.1.0 (/opt/rustwide/workdir/lectures/lesson-03-advanced/section-02-advanced-macros)
[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: `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: `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: `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: `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-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: `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 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: `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: `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: `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: 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] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.49s
[INFO] running `Command { std: "docker" "inspect" "84622ae52b43a2f96433e5f1c249300806c32a2f32bf8fee29715f9c41411ee8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84622ae52b43a2f96433e5f1c249300806c32a2f32bf8fee29715f9c41411ee8", kill_on_drop: false }`
[INFO] [stdout] 84622ae52b43a2f96433e5f1c249300806c32a2f32bf8fee29715f9c41411ee8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+1.93.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9b042c593fb3d4402a5f2b19f7d8b87970cc0529334f0df9c0e5b11589175931
[INFO] running `Command { std: "docker" "start" "-a" "9b042c593fb3d4402a5f2b19f7d8b87970cc0529334f0df9c0e5b11589175931", kill_on_drop: false }`
[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: `lesson03_section01_unsafe_basics` (lib) generated 4 warnings (run `cargo fix --lib -p lesson03_section01_unsafe_basics` to apply 4 suggestions)
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:22
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[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] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:8:31
[INFO] [stderr]   |
[INFO] [stderr] 8 | pub fn parse_and_add(a: &str, b: &str) -> Result<i32, ParseIntError> {
[INFO] [stderr]   |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn to_positive(n: i32) -> Result<u32, String> {
[INFO] [stderr]    |                    ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `xs`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-08-error-handling/src/lib.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn first_or_err(xs: &[i32]) -> Result<i32, String> {
[INFO] [stderr]    |                     ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stderr] 
[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] [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: `lesson01_section06_methods_traits_generics` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section06_methods_traits_generics` to apply 3 suggestions)
[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: `lesson02_section03_iterators_advanced` (lib) generated 1 warning
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:12
[INFO] [stderr]   |
[INFO] [stderr] 6 | 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] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:6:20
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn add(a: i32, b: i32) -> i32 {
[INFO] [stderr]   |                    ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-02-functions/src/lib.rs:12:14
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn greet(name: &str) -> String {
[INFO] [stderr]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stderr] 
[INFO] [stderr] warning: `lesson01_section02_functions` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section02_functions` to apply 3 suggestions)
[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: `lesson01_section07_collections_iterators` (lib) generated 3 warnings (run `cargo fix --lib -p lesson01_section07_collections_iterators` to apply 3 suggestions)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-01-variables/src/lib.rs:15:15
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub fn double(x: i32) -> i32 {
[INFO] [stderr]    |               ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `lesson01_section01_variables` (lib) generated 1 warning (run `cargo fix --lib -p lesson01_section01_variables` to apply 1 suggestion)
[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] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:7:24
[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: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:12:16
[INFO] [stderr]    |
[INFO] [stderr] 12 |     pub fn mul(a: i32, b: i32) -> 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-09-modules-workspaces/src/lib.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 |     pub fn mul(a: i32, b: i32) -> i32 {
[INFO] [stderr]    |                        ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-09-modules-workspaces/src/lib.rs:19:18
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn shout(s: &str) -> String {
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[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] [stderr] warning: unused variable: `s`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:24
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stderr]   |                        ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `suffix`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:6:40
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn append_in_place(s: &mut String, suffix: &str) {
[INFO] [stderr]   |                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_suffix`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:12:19
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub fn first_char(s: &str) -> Option<char> {
[INFO] [stderr]    |                   ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-04-ownership-borrowing/src/lib.rs:20:19
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn longer<'a>(a: &'a str, b: &'a str) -> &'a str {
[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-04-ownership-borrowing/src/lib.rs:20:31
[INFO] [stderr]    |
[INFO] [stderr] 20 | pub fn longer<'a>(a: &'a str, b: &'a str) -> &'a str {
[INFO] [stderr]    |                               ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:6:16
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub fn is_even(n: i32) -> bool {
[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: `n`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:16:18
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn fizz_buzz(n: i32) -> String {
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> lectures/lesson-01-basics/section-03-control-flow/src/lib.rs:22:18
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub fn sum_up_to(n: u32) -> u32 {
[INFO] [stderr]    |                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[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::collections::HashMap`
[INFO] [stderr]  --> lectures/lesson-01-basics/section-07-collections-iterators/tests/basic.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `lesson01_section04_ownership_borrowing` (lib) generated 5 warnings (run `cargo fix --lib -p lesson01_section04_ownership_borrowing` to apply 5 suggestions)
[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] [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] [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] [stderr] warning: `lesson01_section09_modules_workspaces` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr] warning: `lesson01_section01_variables` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `lesson02_section02_concurrency` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `lesson01_section06_methods_traits_generics` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr] warning: `lesson01_section08_error_handling` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr] warning: `lesson01_section03_control_flow` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr] warning: `lesson01_section07_collections_iterators` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr] warning: `lesson01_section02_functions` (lib test) generated 3 warnings (3 duplicates)
[INFO] [stderr] warning: `lesson01_section04_ownership_borrowing` (lib test) generated 5 warnings (5 duplicates)
[INFO] [stderr] warning: `lesson01_section05_data_types_pattern_matching` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr] warning: `lesson02_section03_iterators_advanced` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr] warning: `lesson03_section01_unsafe_basics` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/lesson01_section01_variables-ca045cb7a83c430a)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running tests/basic.rs (/opt/rustwide/target/debug/deps/basic-8f30da34b87f3d9e)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test doubles_numbers ... FAILED
[INFO] [stdout] test returns_ten ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- doubles_numbers stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'doubles_numbers' (26) panicked at lectures/lesson-01-basics/section-01-variables/src/lib.rs:17:5:
[INFO] [stdout] not implemented: Return 2 * x
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55f0cb8eade2 - std::backtrace_rs::backtrace::libunwind::trace::h90e89fac33585832
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x55f0cb8eade2 - std::backtrace_rs::backtrace::trace_unsynchronized::heebcf2380a8e7359
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x55f0cb8eade2 - std::sys::backtrace::_print_fmt::hdf3e2a22d2f810db
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:68:9
[INFO] [stdout]    3:     0x55f0cb8eade2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hac1d885928ba8582
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:38:26
[INFO] [stdout]    4:     0x55f0cb8faaf7 - core::fmt::rt::Argument::fmt::h6901eb7c19abebe8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x55f0cb8faaf7 - core::fmt::write::h83ebb4d32483be9e
[INFO] [stdout]    6:     0x55f0cb8b9b96 - std::io::default_write_fmt::h751a79cdae495f10
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x55f0cb8b9b96 - std::io::Write::write_fmt::h9ef514f8700ff7b2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x55f0cb8ca1a9 - std::sys::backtrace::BacktraceLock::print::hcc2e1a3ac996c911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:41:9
[INFO] [stdout]    9:     0x55f0cb8ca1a9 - std::panicking::default_hook::{{closure}}::h8e9c4d1276f0925f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x55f0cb8ca041 - std::panicking::default_hook::h2b2078d38b534dfb
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x55f0cb88e75e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h39d051e7dedac6a7
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x55f0cb88e75e - test::test_main_with_exit_callback::{{closure}}::h4b005fe75814c302
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x55f0cb8ca422 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd426070722c13cbf
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x55f0cb8ca422 - std::panicking::panic_with_hook::h39b739724e701bfd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x55f0cb8ca29a - std::panicking::panic_handler::{{closure}}::he540c4833054e458
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:691:13
[INFO] [stdout]   16:     0x55f0cb8c5839 - std::sys::backtrace::__rust_end_short_backtrace::hfa179d89deec8aed
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:176:18
[INFO] [stdout]   17:     0x55f0cb8ae95d - __rustc[d131491b17107b07]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x55f0cb901edc - core::panicking::panic_fmt::ha564519d657d9c46
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x55f0cb8ae649 - lesson01_section01_variables::double::hcc772c0c962b7f4e
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/src/lib.rs:17:5
[INFO] [stdout]   20:     0x55f0cb86f5df - basic::doubles_numbers::hf318548f32b88cd0
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:10:16
[INFO] [stdout]   21:     0x55f0cb86f6f7 - basic::doubles_numbers::{{closure}}::h89abe55033fa6571
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:9:21
[INFO] [stdout]   22:     0x55f0cb86eb76 - core::ops::function::FnOnce::call_once::h420c0d59a33f2e31
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x55f0cb88e58b - core::ops::function::FnOnce::call_once::h0217b30cfdee2e67
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x55f0cb88e58b - test::__rust_begin_short_backtrace::h6d98714a1e28f556
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:663:18
[INFO] [stdout]   25:     0x55f0cb8a1f1a - test::run_test_in_process::{{closure}}::he2c70d2634d3a3cc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:74
[INFO] [stdout]   26:     0x55f0cb8a1f1a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h40a0a825bcf17fdd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   27:     0x55f0cb8a1f1a - std::panicking::catch_unwind::do_call::h6c8eb5dd6e7b5975
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   28:     0x55f0cb8a1f1a - std::panicking::catch_unwind::h55455eac2972ad1e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   29:     0x55f0cb8a1f1a - std::panic::catch_unwind::h0025465150a5e558
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   30:     0x55f0cb8a1f1a - test::run_test_in_process::hb61e682f9b630fbc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:27
[INFO] [stdout]   31:     0x55f0cb8a1f1a - test::run_test::{{closure}}::hc2c2a7a38ab176e2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:607:43
[INFO] [stdout]   32:     0x55f0cb87c1b4 - test::run_test::{{closure}}::ha91867b85cd2a911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:637:41
[INFO] [stdout]   33:     0x55f0cb87c1b4 - std::sys::backtrace::__rust_begin_short_backtrace::ha00a9fe02049c339
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:160:18
[INFO] [stdout]   34:     0x55f0cb87fae2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd629fba9153dfb55
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:92:13
[INFO] [stdout]   35:     0x55f0cb87fae2 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4189018816a5c5d9
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   36:     0x55f0cb87fae2 - std::panicking::catch_unwind::do_call::hf9fcdbca3c2e9877
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   37:     0x55f0cb87fae2 - std::panicking::catch_unwind::h97b92d88631c7c64
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   38:     0x55f0cb87fae2 - std::panic::catch_unwind::ha77cdbb68e725e5e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   39:     0x55f0cb87fae2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h511f05bc1a132253
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:90:26
[INFO] [stdout]   40:     0x55f0cb87fae2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h6b68b31e9b685cb8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x55f0cb8c0ecf - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h22a27d165e4e871d
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   42:     0x55f0cb8c0ecf - std::sys::thread::unix::Thread::new::thread_start::h45cc87bb053add0f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   43:     0x7bff7ac91aa4 - <unknown>
[INFO] [stdout]   44:     0x7bff7ad1ea64 - clone
[INFO] [stdout]   45:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] ---- returns_ten stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'returns_ten' (27) panicked at lectures/lesson-01-basics/section-01-variables/tests/basic.rs:5:5:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: 5
[INFO] [stdout]  right: 10
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x55f0cb8eade2 - std::backtrace_rs::backtrace::libunwind::trace::h90e89fac33585832
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x55f0cb8eade2 - std::backtrace_rs::backtrace::trace_unsynchronized::heebcf2380a8e7359
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x55f0cb8eade2 - std::sys::backtrace::_print_fmt::hdf3e2a22d2f810db
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:68:9
[INFO] [stdout]    3:     0x55f0cb8eade2 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::hac1d885928ba8582
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:38:26
[INFO] [stdout]    4:     0x55f0cb8faaf7 - core::fmt::rt::Argument::fmt::h6901eb7c19abebe8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x55f0cb8faaf7 - core::fmt::write::h83ebb4d32483be9e
[INFO] [stdout]    6:     0x55f0cb8b9b96 - std::io::default_write_fmt::h751a79cdae495f10
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x55f0cb8b9b96 - std::io::Write::write_fmt::h9ef514f8700ff7b2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x55f0cb8ca1a9 - std::sys::backtrace::BacktraceLock::print::hcc2e1a3ac996c911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:41:9
[INFO] [stdout]    9:     0x55f0cb8ca1a9 - std::panicking::default_hook::{{closure}}::h8e9c4d1276f0925f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x55f0cb8ca041 - std::panicking::default_hook::h2b2078d38b534dfb
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x55f0cb88e75e - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h39d051e7dedac6a7
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x55f0cb88e75e - test::test_main_with_exit_callback::{{closure}}::h4b005fe75814c302
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x55f0cb8ca422 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hd426070722c13cbf
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x55f0cb8ca422 - std::panicking::panic_with_hook::h39b739724e701bfd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x55f0cb8ca268 - std::panicking::panic_handler::{{closure}}::he540c4833054e458
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x55f0cb8c5839 - std::sys::backtrace::__rust_end_short_backtrace::hfa179d89deec8aed
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:176:18
[INFO] [stdout]   17:     0x55f0cb8ae95d - __rustc[d131491b17107b07]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x55f0cb901edc - core::panicking::panic_fmt::ha564519d657d9c46
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x55f0cb901df3 - core::panicking::assert_failed_inner::h6fc38e43be639d33
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x55f0cb8d9070 - core::panicking::assert_failed::h1a8fc744e5856b18
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x55f0cb86f594 - basic::returns_ten::hc6d62a43e5ebd7c9
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:5:5
[INFO] [stdout]   22:     0x55f0cb86f5b7 - basic::returns_ten::{{closure}}::h62f7b7492cbb48e1
[INFO] [stdout]                                at /opt/rustwide/workdir/lectures/lesson-01-basics/section-01-variables/tests/basic.rs:4:17
[INFO] [stdout]   23:     0x55f0cb86eb36 - core::ops::function::FnOnce::call_once::h19b00103a9c02569
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x55f0cb88e58b - core::ops::function::FnOnce::call_once::h0217b30cfdee2e67
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x55f0cb88e58b - test::__rust_begin_short_backtrace::h6d98714a1e28f556
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x55f0cb8a1f1a - test::run_test_in_process::{{closure}}::he2c70d2634d3a3cc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x55f0cb8a1f1a - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h40a0a825bcf17fdd
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x55f0cb8a1f1a - std::panicking::catch_unwind::do_call::h6c8eb5dd6e7b5975
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x55f0cb8a1f1a - std::panicking::catch_unwind::h55455eac2972ad1e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x55f0cb8a1f1a - std::panic::catch_unwind::h0025465150a5e558
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x55f0cb8a1f1a - test::run_test_in_process::hb61e682f9b630fbc
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x55f0cb8a1f1a - test::run_test::{{closure}}::hc2c2a7a38ab176e2
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x55f0cb87c1b4 - test::run_test::{{closure}}::ha91867b85cd2a911
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x55f0cb87c1b4 - std::sys::backtrace::__rust_begin_short_backtrace::ha00a9fe02049c339
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/backtrace.rs:160:18
[INFO] [stdout]   35:     0x55f0cb87fae2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::{{closure}}::hd629fba9153dfb55
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:92:13
[INFO] [stdout]   36:     0x55f0cb87fae2 - <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4189018816a5c5d9
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x55f0cb87fae2 - std::panicking::catch_unwind::do_call::hf9fcdbca3c2e9877
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x55f0cb87fae2 - std::panicking::catch_unwind::h97b92d88631c7c64
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x55f0cb87fae2 - std::panic::catch_unwind::ha77cdbb68e725e5e
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x55f0cb87fae2 - std::thread::lifecycle::spawn_unchecked::{{closure}}::h511f05bc1a132253
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/thread/lifecycle.rs:90:26
[INFO] [stdout]   41:     0x55f0cb87fae2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h6b68b31e9b685cb8
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x55f0cb8c0ecf - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h22a27d165e4e871d
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x55f0cb8c0ecf - std::sys::thread::unix::Thread::new::thread_start::h45cc87bb053add0f
[INFO] [stdout]                                at /rustc/254b59607d4417e9dffbc307138ae5c86280fe4c/library/std/src/sys/thread/unix.rs:118:17
[INFO] [stdout]   44:     0x7bff7ac91aa4 - <unknown>
[INFO] [stdout]   45:     0x7bff7ad1ea64 - 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] [stderr] error: test failed, to rerun pass `-p lesson01_section01_variables --test basic`
[INFO] running `Command { std: "docker" "inspect" "9b042c593fb3d4402a5f2b19f7d8b87970cc0529334f0df9c0e5b11589175931", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b042c593fb3d4402a5f2b19f7d8b87970cc0529334f0df9c0e5b11589175931", kill_on_drop: false }`
[INFO] [stdout] 9b042c593fb3d4402a5f2b19f7d8b87970cc0529334f0df9c0e5b11589175931
