[INFO] cloning repository https://github.com/FrenzyExists/codingbat-rust-solutions
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/FrenzyExists/codingbat-rust-solutions" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrenzyExists%2Fcodingbat-rust-solutions", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrenzyExists%2Fcodingbat-rust-solutions'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0b9165dca7eca939fa49ddcdc21ab93949ab4b55
[INFO] checking FrenzyExists/codingbat-rust-solutions against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FFrenzyExists%2Fcodingbat-rust-solutions" "/workspace/builds/worker-54/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-54/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FrenzyExists/codingbat-rust-solutions on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/FrenzyExists/codingbat-rust-solutions
[INFO] finished tweaking git repo https://github.com/FrenzyExists/codingbat-rust-solutions
[INFO] tweaked toml for git repo https://github.com/FrenzyExists/codingbat-rust-solutions written to /workspace/builds/worker-54/source/Cargo.toml
[INFO] crate git repo https://github.com/FrenzyExists/codingbat-rust-solutions already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 97485dc39e16515f04effc9ecd4496863173593950c7e2979f05ca31bf0a6d46
[INFO] running `Command { std: "docker" "start" "-a" "97485dc39e16515f04effc9ecd4496863173593950c7e2979f05ca31bf0a6d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97485dc39e16515f04effc9ecd4496863173593950c7e2979f05ca31bf0a6d46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97485dc39e16515f04effc9ecd4496863173593950c7e2979f05ca31bf0a6d46", kill_on_drop: false }`
[INFO] [stdout] 97485dc39e16515f04effc9ecd4496863173593950c7e2979f05ca31bf0a6d46
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-54/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5abfc3367ae176739e567c973ce509ae729c3f28e845bc9f174abb3f3f98a954
[INFO] running `Command { std: "docker" "start" "-a" "5abfc3367ae176739e567c973ce509ae729c3f28e845bc9f174abb3f3f98a954", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking codingbat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:20
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:34
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |                                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `temp` is never read
[INFO] [stdout]   --> src/warmup_2_build/last_2.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut temp = String::with_capacity(2);
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let len = nums.len();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `temp` is assigned to, but never used
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut temp = 0;
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_temp` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `temp` is never read
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         temp = *_i;
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/warmup_2_build/string_times.rs:10:21
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_times(string: &str) -> String {
[INFO] [stdout]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `del_del`
[INFO] [stdout]   --> src/warmup_1_build/del_del.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn del_del() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `array_123_2`
[INFO] [stdout]   --> src/warmup_2_build/array_123.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn array_123_2(nums: &mut [i32]) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `array_count_9`
[INFO] [stdout]   --> src/warmup_2_build/array_count_9.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn array_count_9() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `count_xx`
[INFO] [stdout]   --> src/warmup_2_build/count_xx.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn count_xx() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `front_times`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:34
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |                                  ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `no_triples`
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn no_triples(nums: &mut [i32]) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_bits`
[INFO] [stdout]   --> src/warmup_2_build/string_bits.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn string_bits() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_match`
[INFO] [stdout]   --> src/warmup_2_build/string_match.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn string_match() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `temp` is never read
[INFO] [stdout]   --> src/warmup_2_build/last_2.rs:17:13
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let mut temp = String::with_capacity(2);
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_splosion`
[INFO] [stdout]   --> src/warmup_2_build/string_splosion.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_splosion() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_times`
[INFO] [stdout]   --> src/warmup_2_build/string_times.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_times(string: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let len = nums.len();
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_yak`
[INFO] [stdout]   --> src/warmup_2_build/string_yak.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn string_yak(string: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `temp` is assigned to, but never used
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:16:13
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let mut temp = 0;
[INFO] [stdout]    |             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_temp` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `temp` is never read
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         temp = *_i;
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `string`
[INFO] [stdout]   --> src/warmup_2_build/string_times.rs:10:21
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_times(string: &str) -> String {
[INFO] [stdout]    |                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_string`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `del_del`
[INFO] [stdout]   --> src/warmup_1_build/del_del.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn del_del() {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `array_123_2`
[INFO] [stdout]   --> src/warmup_2_build/array_123.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn array_123_2(nums: &mut [i32]) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `array_count_9`
[INFO] [stdout]   --> src/warmup_2_build/array_count_9.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn array_count_9() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `count_xx`
[INFO] [stdout]   --> src/warmup_2_build/count_xx.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn count_xx() {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `front_times`
[INFO] [stdout]   --> src/warmup_2_build/front_times.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub fn front_times(string: &str, n: i32) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `no_triples`
[INFO] [stdout]   --> src/warmup_2_build/no_triples.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn no_triples(nums: &mut [i32]) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_bits`
[INFO] [stdout]   --> src/warmup_2_build/string_bits.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn string_bits() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_match`
[INFO] [stdout]   --> src/warmup_2_build/string_match.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn string_match() {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_splosion`
[INFO] [stdout]   --> src/warmup_2_build/string_splosion.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_splosion() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_times`
[INFO] [stdout]   --> src/warmup_2_build/string_times.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn string_times(string: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `string_yak`
[INFO] [stdout]   --> src/warmup_2_build/string_yak.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn string_yak(string: &str) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 29s
[INFO] running `Command { std: "docker" "inspect" "5abfc3367ae176739e567c973ce509ae729c3f28e845bc9f174abb3f3f98a954", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5abfc3367ae176739e567c973ce509ae729c3f28e845bc9f174abb3f3f98a954", kill_on_drop: false }`
[INFO] [stdout] 5abfc3367ae176739e567c973ce509ae729c3f28e845bc9f174abb3f3f98a954