[INFO] cloning repository https://github.com/aniruddhha/rust-hands-on
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/aniruddhha/rust-hands-on" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faniruddhha%2Frust-hands-on", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faniruddhha%2Frust-hands-on'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 41287cbda4d46438d8a6b2bca656babc0a22bfcd
[INFO] testing aniruddhha/rust-hands-on against master#0d162b25edd5bf0dba9a22e83b614f1113e90474 for pr-150681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faniruddhha%2Frust-hands-on" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/aniruddhha/rust-hands-on
[INFO] finished tweaking git repo https://github.com/aniruddhha/rust-hands-on
[INFO] tweaked toml for git repo https://github.com/aniruddhha/rust-hands-on written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/aniruddhha/rust-hands-on on toolchain 0d162b25edd5bf0dba9a22e83b614f1113e90474
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/aniruddhha/rust-hands-on already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 134db05ddfd1562f59a8ac3fc194f0b322eaee62a7d5967b9bf7f91bbf8bb6f2
[INFO] running `Command { std: "docker" "start" "-a" "134db05ddfd1562f59a8ac3fc194f0b322eaee62a7d5967b9bf7f91bbf8bb6f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "134db05ddfd1562f59a8ac3fc194f0b322eaee62a7d5967b9bf7f91bbf8bb6f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "134db05ddfd1562f59a8ac3fc194f0b322eaee62a7d5967b9bf7f91bbf8bb6f2", kill_on_drop: false }`
[INFO] [stdout] 134db05ddfd1562f59a8ac3fc194f0b322eaee62a7d5967b9bf7f91bbf8bb6f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 21b04ee008c44ba253466872e908d61000100719f18af0b0144de907273ca0cb
[INFO] running `Command { std: "docker" "start" "-a" "21b04ee008c44ba253466872e908d61000100719f18af0b0144de907273ca0cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-hands-on v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fmt::write`
[INFO] [stdout]  --> src/bin/08_error_01.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{env, fmt::write, fs, io::Error};
[INFO] [stdout]   |                ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_1` is never used
[INFO] [stdout]  --> src/bin/08_error_01.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn basic_1() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_2` is never used
[INFO] [stdout]  --> src/bin/08_error_01.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn basic_2() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_3` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn basic_3() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_4` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn basic_4() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_6` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn basic_6() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_7` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn basic_7() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `box_demo` is never used
[INFO] [stdout]  --> src/bin/06_smart_pointers_01.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn box_demo() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rc_demo_1` is never used
[INFO] [stdout]  --> src/bin/06_smart_pointers_01.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn rc_demo_1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rc_demo_2` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn rc_demo_2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arc_demo_1` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn arc_demo_1() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell_demo_1` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn refcell_demo_1() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell_demo_2` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn refcell_demo_2() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut y1 = &mut a;
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let str1: String = "hello".to_owned();
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let str2: &str = "hello again";
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x1 = &a;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x2`
[INFO] [stdout]   --> src/bin/02_ownership_borrow.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let x2 = &a;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Base` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Base {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Gutter` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait Gutter {
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Margin` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 | trait Margin { 
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Level1` is never used
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | trait Level1: Base + Gutter {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Level2` is never used
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | trait Level2: Base + Gutter + Margin {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_4` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn basic_4() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_5` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn basic_5() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_6` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn basic_6() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut a = 10; // mutable variable
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `z` is assigned to, but never used
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut z = y;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_z` instead
[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]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `z` is never read
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     z = &90;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_one` is never used
[INFO] [stdout]  --> src/bin/02_ownership_borrow_02.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn add_one(x: &mut i32) {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `flat_mapped`
[INFO] [stdout]   --> src/bin/01_vec.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let flat_mapped = words.iter().flat_map(|word| word.chars()).collect::<Vec<char>>();
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_flat_mapped`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demo1` is never used
[INFO] [stdout]  --> src/bin/01_vec.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn demo1() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demo2` is never used
[INFO] [stdout]   --> src/bin/01_vec.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn demo2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.85s
[INFO] running `Command { std: "docker" "inspect" "21b04ee008c44ba253466872e908d61000100719f18af0b0144de907273ca0cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21b04ee008c44ba253466872e908d61000100719f18af0b0144de907273ca0cb", kill_on_drop: false }`
[INFO] [stdout] 21b04ee008c44ba253466872e908d61000100719f18af0b0144de907273ca0cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0236c2fdcb27573f1f92470a0d022733614948876e9355dddb596a00212998a
[INFO] running `Command { std: "docker" "start" "-a" "d0236c2fdcb27573f1f92470a0d022733614948876e9355dddb596a00212998a", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-hands-on v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut a = 10; // mutable variable
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `z` is assigned to, but never used
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let mut z = y;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_z` instead
[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]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `z` is never read
[INFO] [stdout]   --> src/bin/02_ownership_borrow_02.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     z = &90;
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_one` is never used
[INFO] [stdout]  --> src/bin/02_ownership_borrow_02.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn add_one(x: &mut i32) {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Base` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Base {
[INFO] [stdout]   |       ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Gutter` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | trait Gutter {
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Margin` is never used
[INFO] [stdout]  --> src/bin/05_trait_inheritance.rs:9:7
[INFO] [stdout]   |
[INFO] [stdout] 9 | trait Margin { 
[INFO] [stdout]   |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Level1` is never used
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:13:7
[INFO] [stdout]    |
[INFO] [stdout] 13 | trait Level1: Base + Gutter {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Level2` is never used
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:17:7
[INFO] [stdout]    |
[INFO] [stdout] 17 | trait Level2: Base + Gutter + Margin {
[INFO] [stdout]    |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Point` is never constructed
[INFO] [stdout]   --> src/bin/05_trait_inheritance.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct Point {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_4` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn basic_4() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_5` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:38:4
[INFO] [stdout]    |
[INFO] [stdout] 38 | fn basic_5() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_6` is never used
[INFO] [stdout]   --> src/bin/07_options_01.rs:45:4
[INFO] [stdout]    |
[INFO] [stdout] 45 | fn basic_6() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `fmt::write`
[INFO] [stdout]  --> src/bin/08_error_01.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::{env, fmt::write, fs, io::Error};
[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: `flat_mapped`
[INFO] [stdout]   --> src/bin/01_vec.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let flat_mapped = words.iter().flat_map(|word| word.chars()).collect::<Vec<char>>();
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_flat_mapped`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demo1` is never used
[INFO] [stdout]  --> src/bin/01_vec.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn demo1() {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `demo2` is never used
[INFO] [stdout]   --> src/bin/01_vec.rs:30:4
[INFO] [stdout]    |
[INFO] [stdout] 30 | fn demo2() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/02_ownership_borrow.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut y1 = &mut a;
[INFO] [stdout]    |         ----^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str1`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let str1: String = "hello".to_owned();
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str2`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let str2: &str = "hello again";
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x1`
[INFO] [stdout]  --> src/bin/02_ownership_borrow.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let x1 = &a;
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x2`
[INFO] [stdout]   --> src/bin/02_ownership_borrow.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let x2 = &a;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `box_demo` is never used
[INFO] [stdout]  --> src/bin/06_smart_pointers_01.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn box_demo() {
[INFO] [stdout]   |    ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rc_demo_1` is never used
[INFO] [stdout]  --> src/bin/06_smart_pointers_01.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn rc_demo_1() {
[INFO] [stdout]   |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `rc_demo_2` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:25:4
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn rc_demo_2() {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `arc_demo_1` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn arc_demo_1() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell_demo_1` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn refcell_demo_1() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `refcell_demo_2` is never used
[INFO] [stdout]   --> src/bin/06_smart_pointers_01.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn refcell_demo_2() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_1` is never used
[INFO] [stdout]  --> src/bin/08_error_01.rs:4:4
[INFO] [stdout]   |
[INFO] [stdout] 4 | fn basic_1() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_2` is never used
[INFO] [stdout]  --> src/bin/08_error_01.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn basic_2() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_3` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:18:4
[INFO] [stdout]    |
[INFO] [stdout] 18 | fn basic_3() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_4` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn basic_4() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_6` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:50:4
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn basic_6() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `basic_7` is never used
[INFO] [stdout]   --> src/bin/08_error_01.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn basic_7() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `Command { std: "docker" "inspect" "d0236c2fdcb27573f1f92470a0d022733614948876e9355dddb596a00212998a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0236c2fdcb27573f1f92470a0d022733614948876e9355dddb596a00212998a", kill_on_drop: false }`
[INFO] [stdout] d0236c2fdcb27573f1f92470a0d022733614948876e9355dddb596a00212998a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0d162b25edd5bf0dba9a22e83b614f1113e90474" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7ce5510370a5d29fa9bcf1d33fa7c51286834274a5effec2254e192615ef59bb
[INFO] running `Command { std: "docker" "start" "-a" "7ce5510370a5d29fa9bcf1d33fa7c51286834274a5effec2254e192615ef59bb", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `fmt::write`
[INFO] [stderr]  --> src/bin/08_error_01.rs:2:16
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::{env, fmt::write, fs, io::Error};
[INFO] [stderr]   |                ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_1` is never used
[INFO] [stderr]  --> src/bin/08_error_01.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn basic_1() {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_2` is never used
[INFO] [stderr]  --> src/bin/08_error_01.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn basic_2() {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_3` is never used
[INFO] [stderr]   --> src/bin/08_error_01.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn basic_3() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_4` is never used
[INFO] [stderr]   --> src/bin/08_error_01.rs:27:4
[INFO] [stderr]    |
[INFO] [stderr] 27 | fn basic_4() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_6` is never used
[INFO] [stderr]   --> src/bin/08_error_01.rs:50:4
[INFO] [stderr]    |
[INFO] [stderr] 50 | fn basic_6() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_7` is never used
[INFO] [stderr]   --> src/bin/08_error_01.rs:86:4
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn basic_7() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-hands-on` (bin "08_error_01" test) generated 7 warnings (run `cargo fix --bin "08_error_01" -p rust-hands-on --tests` to apply 1 suggestion)
[INFO] [stderr] warning: unused variable: `flat_mapped`
[INFO] [stderr]   --> src/bin/01_vec.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let flat_mapped = words.iter().flat_map(|word| word.chars()).collect::<Vec<char>>();
[INFO] [stderr]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_flat_mapped`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `demo1` is never used
[INFO] [stderr]  --> src/bin/01_vec.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn demo1() {
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `demo2` is never used
[INFO] [stderr]   --> src/bin/01_vec.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn demo2() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Base` is never used
[INFO] [stderr]  --> src/bin/05_trait_inheritance.rs:1:7
[INFO] [stderr]   |
[INFO] [stderr] 1 | trait Base {
[INFO] [stderr]   |       ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Gutter` is never used
[INFO] [stderr]  --> src/bin/05_trait_inheritance.rs:5:7
[INFO] [stderr]   |
[INFO] [stderr] 5 | trait Gutter {
[INFO] [stderr]   |       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Margin` is never used
[INFO] [stderr]  --> src/bin/05_trait_inheritance.rs:9:7
[INFO] [stderr]   |
[INFO] [stderr] 9 | trait Margin { 
[INFO] [stderr]   |       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Level1` is never used
[INFO] [stderr]   --> src/bin/05_trait_inheritance.rs:13:7
[INFO] [stderr]    |
[INFO] [stderr] 13 | trait Level1: Base + Gutter {
[INFO] [stderr]    |       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Level2` is never used
[INFO] [stderr]   --> src/bin/05_trait_inheritance.rs:17:7
[INFO] [stderr]    |
[INFO] [stderr] 17 | trait Level2: Base + Gutter + Margin {
[INFO] [stderr]    |       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Point` is never constructed
[INFO] [stderr]   --> src/bin/05_trait_inheritance.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | struct Point {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `box_demo` is never used
[INFO] [stderr]  --> src/bin/06_smart_pointers_01.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | fn box_demo() {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `rc_demo_1` is never used
[INFO] [stderr]  --> src/bin/06_smart_pointers_01.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn rc_demo_1() {
[INFO] [stderr]   |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `rc_demo_2` is never used
[INFO] [stderr]   --> src/bin/06_smart_pointers_01.rs:25:4
[INFO] [stderr]    |
[INFO] [stderr] 25 | fn rc_demo_2() {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `arc_demo_1` is never used
[INFO] [stderr]   --> src/bin/06_smart_pointers_01.rs:34:4
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn arc_demo_1() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `refcell_demo_1` is never used
[INFO] [stderr]   --> src/bin/06_smart_pointers_01.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn refcell_demo_1() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `refcell_demo_2` is never used
[INFO] [stderr]   --> src/bin/06_smart_pointers_01.rs:62:4
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn refcell_demo_2() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/02_ownership_borrow_02.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut a = 10; // mutable variable
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stderr]    |         ----^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `z` is assigned to, but never used
[INFO] [stderr]   --> src/bin/02_ownership_borrow_02.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let mut z = y;
[INFO] [stderr]    |         ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: consider using `_z` instead
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/bin/02_ownership_borrow_02.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let mut b: &i32 = &a; // immutable reference to a
[INFO] [stderr]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `z` is never read
[INFO] [stderr]   --> src/bin/02_ownership_borrow_02.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     z = &90;
[INFO] [stderr]    |     ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `add_one` is never used
[INFO] [stderr]  --> src/bin/02_ownership_borrow_02.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn add_one(x: &mut i32) {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-hands-on` (bin "01_vec" test) generated 3 warnings (run `cargo fix --bin "01_vec" -p rust-hands-on --tests` to apply 1 suggestion)
[INFO] [stderr] warning: `rust-hands-on` (bin "05_trait_inheritance" test) generated 6 warnings
[INFO] [stderr] warning: `rust-hands-on` (bin "06_smart_pointers_01" test) generated 6 warnings
[INFO] [stderr] warning: `rust-hands-on` (bin "02_ownership_borrow_02" test) generated 6 warnings (run `cargo fix --bin "02_ownership_borrow_02" -p rust-hands-on --tests` to apply 3 suggestions)
[INFO] [stderr] warning: function `basic_4` is never used
[INFO] [stderr]   --> src/bin/07_options_01.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn basic_4() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_5` is never used
[INFO] [stderr]   --> src/bin/07_options_01.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn basic_5() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `basic_6` is never used
[INFO] [stderr]   --> src/bin/07_options_01.rs:45:4
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn basic_6() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/bin/02_ownership_borrow.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut y1 = &mut a;
[INFO] [stderr]    |         ----^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str1`
[INFO] [stderr]  --> src/bin/02_ownership_borrow.rs:3:9
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let str1: String = "hello".to_owned();
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str1`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str2`
[INFO] [stderr]  --> src/bin/02_ownership_borrow.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let str2: &str = "hello again";
[INFO] [stderr]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_str2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x1`
[INFO] [stderr]  --> src/bin/02_ownership_borrow.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let x1 = &a;
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_x1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x2`
[INFO] [stderr]   --> src/bin/02_ownership_borrow.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |     let x2 = &a;
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_x2`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-hands-on` (bin "07_options_01" test) generated 3 warnings
[INFO] [stderr] warning: `rust-hands-on` (bin "02_ownership_borrow" test) generated 5 warnings (run `cargo fix --bin "02_ownership_borrow" -p rust-hands-on --tests` to apply 5 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running unittests src/bin/01_vec.rs (/opt/rustwide/target/debug/deps/01_vec-9a741667a1348968)
[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 unittests src/bin/02_ownership_borrow.rs (/opt/rustwide/target/debug/deps/02_ownership_borrow-896f7a6d10d16b2f)
[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 unittests src/bin/02_ownership_borrow_02.rs (/opt/rustwide/target/debug/deps/02_ownership_borrow_02-b3771531ad531174)
[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 unittests src/bin/02_ownership_borrow_03.rs (/opt/rustwide/target/debug/deps/02_ownership_borrow_03-d4e2edcded9cf57b)
[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 unittests src/bin/03_01_linked_list.rs (/opt/rustwide/target/debug/deps/03_01_linked_list-16fafee5f2107e0f)
[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 unittests src/bin/03_02_linked_list.rs (/opt/rustwide/target/debug/deps/03_02_linked_list-91e44d59d3d90ea5)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests src/bin/03_03_linked_list.rs (/opt/rustwide/target/debug/deps/03_03_linked_list-359d4f7593524985)
[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] [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 unittests src/bin/04_max_num.rs (/opt/rustwide/target/debug/deps/04_max_num-4e83f3c6ea06dbab)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::test_max_num ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tests::test_max_num stdout ----
[INFO] [stdout] 
[INFO] [stdout] thread 'tests::test_max_num' (23) panicked at src/bin/04_max_num.rs:27:9:
[INFO] [stdout] assertion `left == right` failed
[INFO] [stdout]   left: 70
[INFO] [stdout]  right: 89
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5ed8314ef322 - std[3b51380354919863]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5ed8314ef322 - std[3b51380354919863]::backtrace_rs::backtrace::trace_unsynchronized::<std[3b51380354919863]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5ed8314ef322 - std[3b51380354919863]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5ed8314ef322 - <<std[3b51380354919863]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[27de1724e4349be2]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5ed831503b5a - <core[27de1724e4349be2]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5ed831503b5a - core[27de1724e4349be2]::fmt::write
[INFO] [stdout]    6:     0x5ed8314f4126 - std[3b51380354919863]::io::default_write_fmt::<alloc[a57f19327c0ad893]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x5ed8314f4126 - <alloc[a57f19327c0ad893]::vec::Vec<u8> as std[3b51380354919863]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x5ed8314cdabf - <std[3b51380354919863]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5ed8314cdabf - std[3b51380354919863]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5ed8314e7609 - std[3b51380354919863]::panicking::default_hook
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x5ed83148308e - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x5ed83148308e - test[182b2e79ecd7bbd9]::test_main_with_exit_callback::<test[182b2e79ecd7bbd9]::test_main::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x5ed8314e77c2 - <alloc[a57f19327c0ad893]::boxed::Box<dyn for<'a, 'b> core[27de1724e4349be2]::ops::function::Fn<(&'a std[3b51380354919863]::panic::PanicHookInfo<'b>,), Output = ()> + core[27de1724e4349be2]::marker::Sync + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::Fn<(&std[3b51380354919863]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x5ed8314e77c2 - std[3b51380354919863]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x5ed8314cdb78 - std[3b51380354919863]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:698:13
[INFO] [stdout]   16:     0x5ed8314c2df9 - std[3b51380354919863]::sys::backtrace::__rust_end_short_backtrace::<std[3b51380354919863]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x5ed8314ce9cd - __rustc[d79c0ace40940972]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x5ed83150422c - core[27de1724e4349be2]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x5ed8315040e3 - core[27de1724e4349be2]::panicking::assert_failed_inner
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:439:17
[INFO] [stdout]   20:     0x5ed8314c2015 - core[27de1724e4349be2]::panicking::assert_failed::<i32, i32>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panicking.rs:394:5
[INFO] [stdout]   21:     0x5ed83147677e - 04_max_num[52d9a844f234358b]::tests::test_max_num
[INFO] [stdout]                                at /opt/rustwide/workdir/src/bin/04_max_num.rs:27:9
[INFO] [stdout]   22:     0x5ed831476067 - 04_max_num[52d9a844f234358b]::tests::test_max_num::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/src/bin/04_max_num.rs:23:22
[INFO] [stdout]   23:     0x5ed831477366 - <04_max_num[52d9a844f234358b]::tests::test_max_num::{closure#0} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x5ed83147743b - <fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   25:     0x5ed83147743b - test[182b2e79ecd7bbd9]::__rust_begin_short_backtrace::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, fn() -> core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:663:18
[INFO] [stdout]   26:     0x5ed831483c9a - test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:74
[INFO] [stdout]   27:     0x5ed831483c9a - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   28:     0x5ed831483c9a - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stdout]   29:     0x5ed831483c9a - std[3b51380354919863]::panicking::catch_unwind::<core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>, core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stdout]   30:     0x5ed831483c9a - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<test[182b2e79ecd7bbd9]::run_test_in_process::{closure#0}>, core[27de1724e4349be2]::result::Result<(), alloc[a57f19327c0ad893]::string::String>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stdout]   31:     0x5ed831483c9a - test[182b2e79ecd7bbd9]::run_test_in_process
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:686:27
[INFO] [stdout]   32:     0x5ed831483c9a - test[182b2e79ecd7bbd9]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:607:43
[INFO] [stdout]   33:     0x5ed83147f244 - test[182b2e79ecd7bbd9]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/test/src/lib.rs:637:41
[INFO] [stdout]   34:     0x5ed83147f244 - std[3b51380354919863]::sys::backtrace::__rust_begin_short_backtrace::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   35:     0x5ed831486792 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   36:     0x5ed831486792 - <core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   37:     0x5ed831486792 - std[3b51380354919863]::panicking::catch_unwind::do_call::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:581:40
[INFO] [stdout]   38:     0x5ed831486792 - std[3b51380354919863]::panicking::catch_unwind::<(), core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panicking.rs:544:19
[INFO] [stdout]   39:     0x5ed831486792 - std[3b51380354919863]::panic::catch_unwind::<core[27de1724e4349be2]::panic::unwind_safe::AssertUnwindSafe<std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/panic.rs:359:14
[INFO] [stdout]   40:     0x5ed831486792 - std[3b51380354919863]::thread::lifecycle::spawn_unchecked::<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   41:     0x5ed831486792 - <std[3b51380354919863]::thread::lifecycle::spawn_unchecked<test[182b2e79ecd7bbd9]::run_test::{closure#1}, ()>::{closure#1} as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   42:     0x5ed8314eebcf - <alloc[a57f19327c0ad893]::boxed::Box<dyn core[27de1724e4349be2]::ops::function::FnOnce<(), Output = ()> + core[27de1724e4349be2]::marker::Send> as core[27de1724e4349be2]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   43:     0x5ed8314eebcf - <std[3b51380354919863]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/0d162b25edd5bf0dba9a22e83b614f1113e90474/library/std/src/sys/thread/unix.rs:119:17
[INFO] [stdout]   44:     0x7925a7a42aa4 - <unknown>
[INFO] [stdout]   45:     0x7925a7acfa64 - clone
[INFO] [stdout]   46:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tests::test_max_num
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.04s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--bin 04_max_num`
[INFO] running `Command { std: "docker" "inspect" "7ce5510370a5d29fa9bcf1d33fa7c51286834274a5effec2254e192615ef59bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ce5510370a5d29fa9bcf1d33fa7c51286834274a5effec2254e192615ef59bb", kill_on_drop: false }`
[INFO] [stdout] 7ce5510370a5d29fa9bcf1d33fa7c51286834274a5effec2254e192615ef59bb
