[INFO] cloning repository https://github.com/xudifsd/rust_leet
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xudifsd/rust_leet" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxudifsd%2Frust_leet", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxudifsd%2Frust_leet'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e00a584e28efb1d38fcd92ba490e402f8e1b6b2f
[INFO] checking xudifsd/rust_leet against master#4d1bd0db7f489b22c6d8aa2385937a95412c015b for pr-114682-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxudifsd%2Frust_leet" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xudifsd/rust_leet on toolchain 4d1bd0db7f489b22c6d8aa2385937a95412c015b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/xudifsd/rust_leet
[INFO] finished tweaking git repo https://github.com/xudifsd/rust_leet
[INFO] tweaked toml for git repo https://github.com/xudifsd/rust_leet written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/xudifsd/rust_leet 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" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded leetcode_prelude v0.2.2
[INFO] [stderr]   Downloaded serde_json v1.0.39
[INFO] [stderr]   Downloaded ryu v0.2.7
[INFO] [stderr]   Downloaded serde v1.0.89
[INFO] [stderr]   Downloaded itoa v0.4.3
[INFO] [stderr]   Downloaded leetcode_test v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f3fa8852ab50cd232fc7cd8752f0291da8dcae0aa14923e1fe65298c86d91df0
[INFO] running `Command { std: "docker" "start" "-a" "f3fa8852ab50cd232fc7cd8752f0291da8dcae0aa14923e1fe65298c86d91df0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f3fa8852ab50cd232fc7cd8752f0291da8dcae0aa14923e1fe65298c86d91df0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3fa8852ab50cd232fc7cd8752f0291da8dcae0aa14923e1fe65298c86d91df0", kill_on_drop: false }`
[INFO] [stdout] f3fa8852ab50cd232fc7cd8752f0291da8dcae0aa14923e1fe65298c86d91df0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+4d1bd0db7f489b22c6d8aa2385937a95412c015b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f92ee436eaa021cc14c0ccd6a89ba819b6c4940b15e93eb7d34b9ddb097cffd
[INFO] running `Command { std: "docker" "start" "-a" "8f92ee436eaa021cc14c0ccd6a89ba819b6c4940b15e93eb7d34b9ddb097cffd", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.89
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling leetcode_test v0.1.1
[INFO] [stderr]     Checking leetcode_prelude v0.2.2
[INFO] [stderr]     Checking rust_leet v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `tail` is never read
[INFO] [stdout]   --> src/design_linked_list.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub struct MyLinkedList {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 46 |     head: Rc<RefCell<MyListNode>>,
[INFO] [stdout] 47 |     tail: Rc<RefCell<MyListNode>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MyLinkedList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `tail` is never read
[INFO] [stdout]   --> src/design_linked_list.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 45 | pub struct MyLinkedList {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] 46 |     head: Rc<RefCell<MyListNode>>,
[INFO] [stdout] 47 |     tail: Rc<RefCell<MyListNode>>,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MyLinkedList` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.59s
[INFO] running `Command { std: "docker" "inspect" "8f92ee436eaa021cc14c0ccd6a89ba819b6c4940b15e93eb7d34b9ddb097cffd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f92ee436eaa021cc14c0ccd6a89ba819b6c4940b15e93eb7d34b9ddb097cffd", kill_on_drop: false }`
[INFO] [stdout] 8f92ee436eaa021cc14c0ccd6a89ba819b6c4940b15e93eb7d34b9ddb097cffd