[INFO] cloning repository https://github.com/JungStar/leetcode
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JungStar/leetcode" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJungStar%2Fleetcode", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJungStar%2Fleetcode'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 804e8d3d066c855bf307cc33c50b5f46c4ecfb4f
[INFO] checking JungStar/leetcode against master#8387315ab3c26a57a1f53a90f188f0bc88514bca for pr-124605
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJungStar%2Fleetcode" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JungStar/leetcode on toolchain 8387315ab3c26a57a1f53a90f188f0bc88514bca
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8387315ab3c26a57a1f53a90f188f0bc88514bca" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JungStar/leetcode
[INFO] finished tweaking git repo https://github.com/JungStar/leetcode
[INFO] tweaked toml for git repo https://github.com/JungStar/leetcode written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/JungStar/leetcode 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" "+8387315ab3c26a57a1f53a90f188f0bc88514bca" "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 JungStar/leetcode against try#fcc50f77e1a14e407d895972348a0ff09eafc210 for pr-124605
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJungStar%2Fleetcode" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JungStar/leetcode on toolchain fcc50f77e1a14e407d895972348a0ff09eafc210
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fcc50f77e1a14e407d895972348a0ff09eafc210" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JungStar/leetcode
[INFO] finished tweaking git repo https://github.com/JungStar/leetcode
[INFO] tweaked toml for git repo https://github.com/JungStar/leetcode written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/JungStar/leetcode 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" "+fcc50f77e1a14e407d895972348a0ff09eafc210" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+fcc50f77e1a14e407d895972348a0ff09eafc210" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e988048184e9446aa3fa2573eaa0ee45131e2a4f0591b3353e30e445f2a310e9
[INFO] running `Command { std: "docker" "start" "-a" "e988048184e9446aa3fa2573eaa0ee45131e2a4f0591b3353e30e445f2a310e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e988048184e9446aa3fa2573eaa0ee45131e2a4f0591b3353e30e445f2a310e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e988048184e9446aa3fa2573eaa0ee45131e2a4f0591b3353e30e445f2a310e9", kill_on_drop: false }`
[INFO] [stdout] e988048184e9446aa3fa2573eaa0ee45131e2a4f0591b3353e30e445f2a310e9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+fcc50f77e1a14e407d895972348a0ff09eafc210" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 878916e48ab7f30a1aaac6f1b6a4d1e0f63de7c1559e074d4612470e4563656e
[INFO] running `Command { std: "docker" "start" "-a" "878916e48ab7f30a1aaac6f1b6a4d1e0f63de7c1559e074d4612470e4563656e", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.9.0
[INFO] [stderr]     Checking itertools v0.12.0
[INFO] [stderr]     Checking leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/prob_1_two_sums/mod.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Solution {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_simple` is never used
[INFO] [stdout]  --> src/prob_1_two_sums/mod.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn two_sum_simple(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_hash` is never used
[INFO] [stdout]   --> src/prob_1_two_sums/mod.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn two_sum_hash(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `two_sum` is never used
[INFO] [stdout]   --> src/prob_1_two_sums/mod.rs:33:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | impl Solution {
[INFO] [stdout]    | ------------- associated function in this implementation
[INFO] [stdout] 33 |     pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Solution` is never constructed
[INFO] [stdout]  --> src/prob_14_longest_common_prefix/mod.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Solution {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `longest_common_prefix` is never used
[INFO] [stdout]  --> src/prob_14_longest_common_prefix/mod.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | impl Solution {
[INFO] [stdout]   | ------------- associated function in this implementation
[INFO] [stdout] 5 |     pub fn longest_common_prefix(strings: Vec<String>) -> String {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `remove_element` is never used
[INFO] [stdout]  --> src/prob_27_remove_element/mod.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn remove_element(numbers: &mut [i32], val: i32) -> i32 {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `two_sum_simple` is never used
[INFO] [stdout]  --> src/prob_1_two_sums/mod.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn two_sum_simple(nums: Vec<i32>, target: i32) -> Vec<i32> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.44s
[INFO] running `Command { std: "docker" "inspect" "878916e48ab7f30a1aaac6f1b6a4d1e0f63de7c1559e074d4612470e4563656e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "878916e48ab7f30a1aaac6f1b6a4d1e0f63de7c1559e074d4612470e4563656e", kill_on_drop: false }`
[INFO] [stdout] 878916e48ab7f30a1aaac6f1b6a4d1e0f63de7c1559e074d4612470e4563656e