[INFO] cloning repository https://github.com/goodwillcoding/rust-exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/goodwillcoding/rust-exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoodwillcoding%2Frust-exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoodwillcoding%2Frust-exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 202233db71f749b11d215b21682268c414167758
[INFO] checking goodwillcoding/rust-exercises against master#9fa580b1175018b0a276b0bc68f9827a106f7260 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgoodwillcoding%2Frust-exercises" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/goodwillcoding/rust-exercises on toolchain 9fa580b1175018b0a276b0bc68f9827a106f7260
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/goodwillcoding/rust-exercises
[INFO] finished tweaking git repo https://github.com/goodwillcoding/rust-exercises
[INFO] tweaked toml for git repo https://github.com/goodwillcoding/rust-exercises written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/goodwillcoding/rust-exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c69f51ffad6a6e9f1ecd742afa8ffce026d4b6873d488f1568074153bc284aee
[INFO] running `Command { std: "docker" "start" "-a" "c69f51ffad6a6e9f1ecd742afa8ffce026d4b6873d488f1568074153bc284aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c69f51ffad6a6e9f1ecd742afa8ffce026d4b6873d488f1568074153bc284aee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c69f51ffad6a6e9f1ecd742afa8ffce026d4b6873d488f1568074153bc284aee", kill_on_drop: false }`
[INFO] [stdout] c69f51ffad6a6e9f1ecd742afa8ffce026d4b6873d488f1568074153bc284aee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 87563623e08dc3bec5ffd417e661c71c099a822753b3bafb85a6bf659e49eff6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "87563623e08dc3bec5ffd417e661c71c099a822753b3bafb85a6bf659e49eff6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling getrandom v0.1.10
[INFO] [stderr]     Checking simple-error v0.2.0
[INFO] [stderr]     Checking test_bin v0.2.0
[INFO] [stderr]     Checking problem5 v0.1.0 (/opt/rustwide/workdir/problems/problem5)
[INFO] [stderr]     Checking problem2 v0.1.0 (/opt/rustwide/workdir/problems/problem2)
[INFO] [stderr]     Checking problem4 v0.1.0 (/opt/rustwide/workdir/problems/problem4)
[INFO] [stderr]     Checking problem1 v0.1.0 (/opt/rustwide/workdir/problems/problem1)
[INFO] [stderr]     Checking problem7 v0.1.0 (/opt/rustwide/workdir/problems/problem7)
[INFO] [stderr]     Checking exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> problems/problem7/src/lib.rs:6:18
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn singleton(x: i64) -> Set {
[INFO] [stdout]   |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn contains(s: &Set, x: i64) -> bool {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn union(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |              ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:16:23
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn union(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:21:18
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn intersect(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:21:27
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn intersect(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                           ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn diff(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp`
[INFO] [stdout]  --> problems/problem4/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:26:22
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn diff(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                      ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:31:15
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn filter(s: Set, p: fn(i64) -> bool) -> Set {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:31:23
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn filter(s: Set, p: fn(i64) -> bool) -> Set {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:37:15
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn forall(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:37:23
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn forall(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:43:15
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn exists(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:43:23
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn exists(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn map(s: Set, f: fn(i64) -> i64) -> Set {
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:49:20
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn map(s: Set, f: fn(i64) -> i64) -> Set {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elems`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:15:24
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn make_flower_box(elems: Vec<&str>) -> String {
[INFO] [stdout]    |                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_elems`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:32:20
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn format_line(s: &str, max_length: usize) -> String {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_length`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:32:29
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn format_line(s: &str, max_length: usize) -> String {
[INFO] [stdout]    |                             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:46:22
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn format_border(s: &str, length: usize) -> String {
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn format_border(s: &str, length: usize) -> String {
[INFO] [stdout]    |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elems`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:58:28
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn get_max_line_length(elems: &Vec<&str>) -> usize {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_elems`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> problems/problem4/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut flower_box = String::new();
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> problems/problem7/src/lib.rs:6:18
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn singleton(x: i64) -> Set {
[INFO] [stdout]   |                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:11:17
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn contains(s: &Set, x: i64) -> bool {
[INFO] [stdout]    |                 ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:16:14
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn union(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |              ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:16:23
[INFO] [stdout]    |
[INFO] [stdout] 16 | pub fn union(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                       ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:21:18
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn intersect(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:21:27
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn intersect(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                           ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:26:13
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn diff(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:26:22
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn diff(s1: Set, s2: Set) -> Set {
[INFO] [stdout]    |                      ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:31:15
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn filter(s: Set, p: fn(i64) -> bool) -> Set {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:31:23
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn filter(s: Set, p: fn(i64) -> bool) -> Set {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:37:15
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn forall(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:37:23
[INFO] [stdout]    |
[INFO] [stdout] 37 | pub fn forall(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:43:15
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn exists(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |               ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:43:23
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub fn exists(s: Set, p: Box<dyn Fn(i64) -> bool>) -> bool {
[INFO] [stdout]    |                       ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:49:12
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn map(s: Set, f: fn(i64) -> i64) -> Set {
[INFO] [stdout]    |            ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> problems/problem7/src/lib.rs:49:20
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn map(s: Set, f: fn(i64) -> i64) -> Set {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp`
[INFO] [stdout]  --> problems/problem4/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> problems/problem5/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> problems/problem5/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::Ordering;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elems`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:15:24
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub fn make_flower_box(elems: Vec<&str>) -> String {
[INFO] [stdout]    |                        ^^^^^ help: if this is intentional, prefix it with an underscore: `_elems`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:32:20
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn format_line(s: &str, max_length: usize) -> String {
[INFO] [stdout]    |                    ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `max_length`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:32:29
[INFO] [stdout]    |
[INFO] [stdout] 32 | pub fn format_line(s: &str, max_length: usize) -> String {
[INFO] [stdout]    |                             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_max_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:46:22
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn format_border(s: &str, length: usize) -> String {
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `length`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:46:31
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn format_border(s: &str, length: usize) -> String {
[INFO] [stdout]    |                               ^^^^^^ help: if this is intentional, prefix it with an underscore: `_length`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `elems`
[INFO] [stdout]   --> problems/problem4/src/lib.rs:58:28
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub fn get_max_line_length(elems: &Vec<&str>) -> usize {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_elems`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> problems/problem4/src/lib.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut flower_box = String::new();
[INFO] [stdout]    |         ----^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 16 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> problems/problem5/src/lib.rs:29:22
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn new () -> Self {}
[INFO] [stdout]    |            ---       ^^^^ expected struct `Mortgage`, found `()`
[INFO] [stdout]    |            |
[INFO] [stdout]    |            implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> problems/problem5/src/lib.rs:29:22
[INFO] [stdout]    |
[INFO] [stdout] 29 |     pub fn new () -> Self {}
[INFO] [stdout]    |            ---       ^^^^ expected struct `Mortgage`, found `()`
[INFO] [stdout]    |            |
[INFO] [stdout]    |            implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `problem5`
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "87563623e08dc3bec5ffd417e661c71c099a822753b3bafb85a6bf659e49eff6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87563623e08dc3bec5ffd417e661c71c099a822753b3bafb85a6bf659e49eff6", kill_on_drop: false }`
[INFO] [stdout] 87563623e08dc3bec5ffd417e661c71c099a822753b3bafb85a6bf659e49eff6