[INFO] cloning repository https://github.com/chiniun/exercise
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/chiniun/exercise" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchiniun%2Fexercise", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchiniun%2Fexercise'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0042b32954d46895c5c80a4a1a6deb05bdd35593
[INFO] checking chiniun/exercise against try#0c70cfbec949d241375e31c5a42066be70c720fc for pr-149681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fchiniun%2Fexercise" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/chiniun/exercise
[INFO] finished tweaking git repo https://github.com/chiniun/exercise
[INFO] tweaked toml for git repo https://github.com/chiniun/exercise written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/chiniun/exercise on toolchain 0c70cfbec949d241375e31c5a42066be70c720fc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/chiniun/exercise 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" "+0c70cfbec949d241375e31c5a42066be70c720fc" "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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8cb2ad93ab7e969f614331afcf649abbce1f03b758bc0d964cafa665ec9366ca
[INFO] running `Command { std: "docker" "start" "-a" "8cb2ad93ab7e969f614331afcf649abbce1f03b758bc0d964cafa665ec9366ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8cb2ad93ab7e969f614331afcf649abbce1f03b758bc0d964cafa665ec9366ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cb2ad93ab7e969f614331afcf649abbce1f03b758bc0d964cafa665ec9366ca", kill_on_drop: false }`
[INFO] [stdout] 8cb2ad93ab7e969f614331afcf649abbce1f03b758bc0d964cafa665ec9366ca
[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@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+0c70cfbec949d241375e31c5a42066be70c720fc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9156266f80a255ddd779c07cbd738f32a7d792516b7849ff318c8e381dff9bc5
[INFO] running `Command { std: "docker" "start" "-a" "9156266f80a255ddd779c07cbd738f32a7d792516b7849ff318c8e381dff9bc5", kill_on_drop: false }`
[INFO] [stderr]     Checking tasks v0.1.0 (/opt/rustwide/workdir/tasks)
[INFO] [stderr]     Checking attempt v0.1.0 (/opt/rustwide/workdir/attempt)
[INFO] [stdout] warning: field `name` is never read
[INFO] [stdout]  --> attempt/src/student.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub struct Student {
[INFO] [stdout]   |            ------- field in this struct
[INFO] [stdout] 2 |     name: String,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking exercise v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "9156266f80a255ddd779c07cbd738f32a7d792516b7849ff318c8e381dff9bc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9156266f80a255ddd779c07cbd738f32a7d792516b7849ff318c8e381dff9bc5", kill_on_drop: false }`
[INFO] [stdout] 9156266f80a255ddd779c07cbd738f32a7d792516b7849ff318c8e381dff9bc5