[INFO] cloning repository https://github.com/tsingtwo/2023_ZJU_RUST_HW3
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tsingtwo/2023_ZJU_RUST_HW3" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftsingtwo%2F2023_ZJU_RUST_HW3", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftsingtwo%2F2023_ZJU_RUST_HW3'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2a74649acc003ee70cf0a4783d85d9793b63bb94
[INFO] checking tsingtwo/2023_ZJU_RUST_HW3 against try#723ab942d877517caf445dafde0416803ef56501 for pr-143857
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftsingtwo%2F2023_ZJU_RUST_HW3" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3
[INFO] finished tweaking git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3
[INFO] tweaked toml for git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 on toolchain 723ab942d877517caf445dafde0416803ef56501
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+723ab942d877517caf445dafde0416803ef56501" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 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" "+723ab942d877517caf445dafde0416803ef56501" "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 tsingtwo/2023_ZJU_RUST_HW3 against try#723ab942d877517caf445dafde0416803ef56501 for pr-143857
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftsingtwo%2F2023_ZJU_RUST_HW3" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3
[INFO] finished tweaking git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3
[INFO] tweaked toml for git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 on toolchain 723ab942d877517caf445dafde0416803ef56501
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+723ab942d877517caf445dafde0416803ef56501" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/tsingtwo/2023_ZJU_RUST_HW3 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" "+723ab942d877517caf445dafde0416803ef56501" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+723ab942d877517caf445dafde0416803ef56501" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 56808040d2e5fa6ae8a04cc45123e7a31071092f69c1ab7ffa066d21de0d73a3
[INFO] running `Command { std: "docker" "start" "-a" "56808040d2e5fa6ae8a04cc45123e7a31071092f69c1ab7ffa066d21de0d73a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "56808040d2e5fa6ae8a04cc45123e7a31071092f69c1ab7ffa066d21de0d73a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56808040d2e5fa6ae8a04cc45123e7a31071092f69c1ab7ffa066d21de0d73a3", kill_on_drop: false }`
[INFO] [stdout] 56808040d2e5fa6ae8a04cc45123e7a31071092f69c1ab7ffa066d21de0d73a3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+723ab942d877517caf445dafde0416803ef56501" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 435ae51bdcbedc70b7c1d7389a5038aa63c3de6d1a406dcada6df3f9d551d295
[INFO] running `Command { std: "docker" "start" "-a" "435ae51bdcbedc70b7c1d7389a5038aa63c3de6d1a406dcada6df3f9d551d295", kill_on_drop: false }`
[INFO] [stderr]     Checking hw3_test v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `crate::myrc::Myrc`
[INFO] [stdout]  --> src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::myrc::Myrc;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Myrc` is never constructed
[INFO] [stdout]  --> src/myrc.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Myrc<T>{
[INFO] [stdout]   |            ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `strong_count` are never used
[INFO] [stdout]   --> src/myrc.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl<T> Myrc<T> {
[INFO] [stdout]    | --------------- associated items in this implementation
[INFO] [stdout] 9  |     pub fn new(p:T)->Self{
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     pub fn strong_count(&self)->usize{
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MyStack` is never constructed
[INFO] [stdout]  --> src/stack.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct MyStack<T> {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used
[INFO] [stdout]   --> src/stack.rs:9:12
[INFO] [stdout]    |
[INFO] [stdout] 8  | impl<T> MyStack<T> {
[INFO] [stdout]    | ------------------ associated items in this implementation
[INFO] [stdout] 9  |     pub fn new() -> MyStack<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn push(&self, value: T) {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub fn pop(&self) -> Option<T> {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "435ae51bdcbedc70b7c1d7389a5038aa63c3de6d1a406dcada6df3f9d551d295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "435ae51bdcbedc70b7c1d7389a5038aa63c3de6d1a406dcada6df3f9d551d295", kill_on_drop: false }`
[INFO] [stdout] 435ae51bdcbedc70b7c1d7389a5038aa63c3de6d1a406dcada6df3f9d551d295