[INFO] cloning repository https://github.com/untilyou58/rust-exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/untilyou58/rust-exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funtilyou58%2Frust-exercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funtilyou58%2Frust-exercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 73a3a92c67aa519feb5f990c737b864f953fff3f
[INFO] testing untilyou58/rust-exercise against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funtilyou58%2Frust-exercise" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/untilyou58/rust-exercise
[INFO] finished tweaking git repo https://github.com/untilyou58/rust-exercise
[INFO] tweaked toml for git repo https://github.com/untilyou58/rust-exercise written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/untilyou58/rust-exercise on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/untilyou58/rust-exercise 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" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1edc4774613e82521158fb853574911a1f26fadb2b95cec753bf12b58ecc487e
[INFO] running `Command { std: "docker" "start" "-a" "1edc4774613e82521158fb853574911a1f26fadb2b95cec753bf12b58ecc487e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1edc4774613e82521158fb853574911a1f26fadb2b95cec753bf12b58ecc487e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1edc4774613e82521158fb853574911a1f26fadb2b95cec753bf12b58ecc487e", kill_on_drop: false }`
[INFO] [stdout] 1edc4774613e82521158fb853574911a1f26fadb2b95cec753bf12b58ecc487e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6ffa402585853f6f0a2944ecbd771ea59b0689193ab3c79bc1185fdaa33d3378
[INFO] running `Command { std: "docker" "start" "-a" "6ffa402585853f6f0a2944ecbd771ea59b0689193ab3c79bc1185fdaa33d3378", kill_on_drop: false }`
[INFO] [stderr]    Compiling exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[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 `change_value` is never used
[INFO] [stdout]  --> src/ownership/ex1.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn change_value(input: u32, output: &mut u32) -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_is_prime` is never used
[INFO] [stdout]   --> src/ownership/ex2.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn vector_is_prime(num: u64, p: &Vec<u64>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex3.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex4.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/ownership/ex4.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn test(a: &mut Vec<u8>) -> (Vec<u8>, i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `School` is never constructed
[INFO] [stdout]   --> src/complex/ex1.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct School {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `grades`, and `grade` are never used
[INFO] [stdout]    --> src/complex/ex1.rs:87:12
[INFO] [stdout]     |
[INFO] [stdout]  86 | impl School {
[INFO] [stdout]     | ----------- associated items in this implementation
[INFO] [stdout]  87 |     pub fn new() -> School {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |     pub fn add(&mut self, grade: u32, student: &str) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  97 |     pub fn grades(&self) -> Vec<u32> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 106 |     pub fn grade(&self, grade: u32) -> Vec<String> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/complex/ex1.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrDisplayable` is never constructed
[INFO] [stdout]  --> src/trait_life/ex2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct StrDisplayable<'a>(Vec<&'a str>);
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_life/ex2.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "6ffa402585853f6f0a2944ecbd771ea59b0689193ab3c79bc1185fdaa33d3378", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ffa402585853f6f0a2944ecbd771ea59b0689193ab3c79bc1185fdaa33d3378", kill_on_drop: false }`
[INFO] [stdout] 6ffa402585853f6f0a2944ecbd771ea59b0689193ab3c79bc1185fdaa33d3378
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2fb23748013670299ec183669c1bc548ede6456b4189c913e89f8d1cf2fabacc
[INFO] running `Command { std: "docker" "start" "-a" "2fb23748013670299ec183669c1bc548ede6456b4189c913e89f8d1cf2fabacc", kill_on_drop: false }`
[INFO] [stderr]    Compiling exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex1.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn main() {
[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 `change_value` is never used
[INFO] [stdout]  --> src/ownership/ex1.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn change_value(input: u32, output: &mut u32) -> u32 {
[INFO] [stdout]   |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex2.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_is_prime` is never used
[INFO] [stdout]   --> src/ownership/ex2.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn vector_is_prime(num: u64, p: &Vec<u64>) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex3.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/ownership/ex4.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn main() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test` is never used
[INFO] [stdout]   --> src/ownership/ex4.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn test(a: &mut Vec<u8>) -> (Vec<u8>, i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `School` is never constructed
[INFO] [stdout]   --> src/complex/ex1.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 | pub struct School {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `grades`, and `grade` are never used
[INFO] [stdout]    --> src/complex/ex1.rs:87:12
[INFO] [stdout]     |
[INFO] [stdout]  86 | impl School {
[INFO] [stdout]     | ----------- associated items in this implementation
[INFO] [stdout]  87 |     pub fn new() -> School {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  93 |     pub fn add(&mut self, grade: u32, student: &str) {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  97 |     pub fn grades(&self) -> Vec<u32> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 106 |     pub fn grade(&self, grade: u32) -> Vec<String> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]    --> src/complex/ex1.rs:119:8
[INFO] [stdout]     |
[INFO] [stdout] 119 | pub fn main() {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `StrDisplayable` is never constructed
[INFO] [stdout]  --> src/trait_life/ex2.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct StrDisplayable<'a>(Vec<&'a str>);
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/trait_life/ex2.rs:16:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn main() {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "2fb23748013670299ec183669c1bc548ede6456b4189c913e89f8d1cf2fabacc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fb23748013670299ec183669c1bc548ede6456b4189c913e89f8d1cf2fabacc", kill_on_drop: false }`
[INFO] [stdout] 2fb23748013670299ec183669c1bc548ede6456b4189c913e89f8d1cf2fabacc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 20e1a263d82f8a5756ad218d4b7a30234884b433b5233d0c54fb2089e04754c1
[INFO] running `Command { std: "docker" "start" "-a" "20e1a263d82f8a5756ad218d4b7a30234884b433b5233d0c54fb2089e04754c1", kill_on_drop: false }`
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/ownership/ex1.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `change_value` is never used
[INFO] [stderr]  --> src/ownership/ex1.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn change_value(input: u32, output: &mut u32) -> u32 {
[INFO] [stderr]   |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/ownership/ex2.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `vector_is_prime` is never used
[INFO] [stderr]   --> src/ownership/ex2.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn vector_is_prime(num: u64, p: &Vec<u64>) -> bool {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/ownership/ex3.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]  --> src/ownership/ex4.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub fn main() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test` is never used
[INFO] [stderr]   --> src/ownership/ex4.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | pub fn test(a: &mut Vec<u8>) -> (Vec<u8>, i32) {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `School` is never constructed
[INFO] [stderr]   --> src/complex/ex1.rs:82:12
[INFO] [stderr]    |
[INFO] [stderr] 82 | pub struct School {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new`, `add`, `grades`, and `grade` are never used
[INFO] [stderr]    --> src/complex/ex1.rs:87:12
[INFO] [stderr]     |
[INFO] [stderr]  86 | impl School {
[INFO] [stderr]     | ----------- associated items in this implementation
[INFO] [stderr]  87 |     pub fn new() -> School {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] ...
[INFO] [stderr]  93 |     pub fn add(&mut self, grade: u32, student: &str) {
[INFO] [stderr]     |            ^^^
[INFO] [stderr] ...
[INFO] [stderr]  97 |     pub fn grades(&self) -> Vec<u32> {
[INFO] [stderr]     |            ^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 106 |     pub fn grade(&self, grade: u32) -> Vec<String> {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]    --> src/complex/ex1.rs:119:8
[INFO] [stderr]     |
[INFO] [stderr] 119 | pub fn main() {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `StrDisplayable` is never constructed
[INFO] [stderr]  --> src/trait_life/ex2.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | struct StrDisplayable<'a>(Vec<&'a str>);
[INFO] [stderr]   |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/trait_life/ex2.rs:16:8
[INFO] [stderr]    |
[INFO] [stderr] 16 | pub fn main() {
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `exercise` (bin "exercise" test) generated 12 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/exercise-e54a6c4b98878455)
[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] running `Command { std: "docker" "inspect" "20e1a263d82f8a5756ad218d4b7a30234884b433b5233d0c54fb2089e04754c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20e1a263d82f8a5756ad218d4b7a30234884b433b5233d0c54fb2089e04754c1", kill_on_drop: false }`
[INFO] [stdout] 20e1a263d82f8a5756ad218d4b7a30234884b433b5233d0c54fb2089e04754c1