[INFO] cloning repository https://github.com/kwannoel/algorithms
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kwannoel/algorithms" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkwannoel%2Falgorithms", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkwannoel%2Falgorithms'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fb2884575239529b0da700522461e460036cc012
[INFO] checking kwannoel/algorithms against master#b3bd7058c139e71bae0862ef8f8ac936208873e9 for pr-123752
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkwannoel%2Falgorithms" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kwannoel/algorithms on toolchain b3bd7058c139e71bae0862ef8f8ac936208873e9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b3bd7058c139e71bae0862ef8f8ac936208873e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kwannoel/algorithms
[INFO] finished tweaking git repo https://github.com/kwannoel/algorithms
[INFO] tweaked toml for git repo https://github.com/kwannoel/algorithms written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kwannoel/algorithms 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" "+b3bd7058c139e71bae0862ef8f8ac936208873e9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking kwannoel/algorithms against try#57fe1b734d9ff1c8a92bda60b85506b9648158d3 for pr-123752
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkwannoel%2Falgorithms" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kwannoel/algorithms on toolchain 57fe1b734d9ff1c8a92bda60b85506b9648158d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kwannoel/algorithms
[INFO] finished tweaking git repo https://github.com/kwannoel/algorithms
[INFO] tweaked toml for git repo https://github.com/kwannoel/algorithms written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kwannoel/algorithms 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" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking kwannoel/algorithms against try#57fe1b734d9ff1c8a92bda60b85506b9648158d3 for pr-123752
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkwannoel%2Falgorithms" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kwannoel/algorithms on toolchain 57fe1b734d9ff1c8a92bda60b85506b9648158d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kwannoel/algorithms
[INFO] finished tweaking git repo https://github.com/kwannoel/algorithms
[INFO] tweaked toml for git repo https://github.com/kwannoel/algorithms written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kwannoel/algorithms 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" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbcdbce7c828767ff777a7e5704b3410129d07cf6b7a8bfb9534e8e8a4835157
[INFO] running `Command { std: "docker" "start" "-a" "bbcdbce7c828767ff777a7e5704b3410129d07cf6b7a8bfb9534e8e8a4835157", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbcdbce7c828767ff777a7e5704b3410129d07cf6b7a8bfb9534e8e8a4835157", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbcdbce7c828767ff777a7e5704b3410129d07cf6b7a8bfb9534e8e8a4835157", kill_on_drop: false }`
[INFO] [stdout] bbcdbce7c828767ff777a7e5704b3410129d07cf6b7a8bfb9534e8e8a4835157
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+57fe1b734d9ff1c8a92bda60b85506b9648158d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb682d61ad18c4bac7ca905a24217d55f7c14885719b41558b7f05c605e49e72
[INFO] running `Command { std: "docker" "start" "-a" "fb682d61ad18c4bac7ca905a24217d55f7c14885719b41558b7f05c605e49e72", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking algorithms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `mid`
[INFO] [stdout]   --> src/sort/merge_sort.rs:50:63
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn iterative_merge_sort(mut arr: &mut Vec<i32>, l: usize, mid: usize, r: usize) {
[INFO] [stdout]    |                                                               ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `bubble_sort` is never used
[INFO] [stdout]  --> src/sort/bubble_sort.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn bubble_sort(arr: &mut [i32]) {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge_sort` is never used
[INFO] [stdout]   --> src/sort/merge_sort.rs:11:8
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub fn merge_sort(arr: Vec<i32>) -> Vec<i32>{
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge` is never used
[INFO] [stdout]   --> src/sort/merge_sort.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn merge(arr1: Vec<i32>, arr2: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iterative_merge_sort` is never used
[INFO] [stdout]   --> src/sort/merge_sort.rs:50:8
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn iterative_merge_sort(mut arr: &mut Vec<i32>, l: usize, mid: usize, r: usize) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `insertion_sort` is never used
[INFO] [stdout]  --> src/sort/insertion_sort.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn insertion_sort(arr: &mut [i32]) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `selection_sort` is never used
[INFO] [stdout]  --> src/sort/selection_sort.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | pub fn selection_sort(arr: &mut [i32]) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `quick_sort` is never used
[INFO] [stdout]  --> src/sort/quick_sort.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn quick_sort(arr: &mut [i32]) {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `knuth_shuffle` is never used
[INFO] [stdout]  --> src/shuffle.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn knuth_shuffle(arr: &mut [i32]) {
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `newPos` should have a snake case name
[INFO] [stdout]  --> src/shuffle.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let newPos = rng.gen_range(0, i);
[INFO] [stdout]   |             ^^^^^^ help: convert the identifier to snake case: `new_pos`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mid`
[INFO] [stdout]   --> src/sort/merge_sort.rs:50:63
[INFO] [stdout]    |
[INFO] [stdout] 50 | pub fn iterative_merge_sort(mut arr: &mut Vec<i32>, l: usize, mid: usize, r: usize) {
[INFO] [stdout]    |                                                               ^^^ help: if this is intentional, prefix it with an underscore: `_mid`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `iterative_merge_sort_wrap` is never used
[INFO] [stdout]    --> src/sort/merge_sort.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 |     fn iterative_merge_sort_wrap(arr: &mut [i32]) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `newPos` should have a snake case name
[INFO] [stdout]  --> src/shuffle.rs:9:13
[INFO] [stdout]   |
[INFO] [stdout] 9 |         let newPos = rng.gen_range(0, i);
[INFO] [stdout]   |             ^^^^^^ help: convert the identifier to snake case: `new_pos`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.86s
[INFO] running `Command { std: "docker" "inspect" "fb682d61ad18c4bac7ca905a24217d55f7c14885719b41558b7f05c605e49e72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb682d61ad18c4bac7ca905a24217d55f7c14885719b41558b7f05c605e49e72", kill_on_drop: false }`
[INFO] [stdout] fb682d61ad18c4bac7ca905a24217d55f7c14885719b41558b7f05c605e49e72