[INFO] cloning repository https://github.com/jrheard/rustbook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jrheard/rustbook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjrheard%2Frustbook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjrheard%2Frustbook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 751299e1df274231b14a0687fbe79103b6090fcc
[INFO] testing jrheard/rustbook against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjrheard%2Frustbook" "/workspace/builds/worker-51/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jrheard/rustbook on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jrheard/rustbook
[INFO] finished tweaking git repo https://github.com/jrheard/rustbook
[INFO] tweaked toml for git repo https://github.com/jrheard/rustbook written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate git repo https://github.com/jrheard/rustbook already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded assert_approx_eq v1.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 75c1a7f8503eb5436a773f76f78c8e72dd2602351e9e8701a3eb17cd6d1c331b
[INFO] running `Command { std: "docker" "start" "-a" "75c1a7f8503eb5436a773f76f78c8e72dd2602351e9e8701a3eb17cd6d1c331b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "75c1a7f8503eb5436a773f76f78c8e72dd2602351e9e8701a3eb17cd6d1c331b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75c1a7f8503eb5436a773f76f78c8e72dd2602351e9e8701a3eb17cd6d1c331b", kill_on_drop: false }`
[INFO] [stdout] 75c1a7f8503eb5436a773f76f78c8e72dd2602351e9e8701a3eb17cd6d1c331b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a31d2fba63a438b0f2efd430b021ee4fbcf4aeaf44c9b83f48dee15d396efd90
[INFO] running `Command { std: "docker" "start" "-a" "a31d2fba63a438b0f2efd430b021ee4fbcf4aeaf44c9b83f48dee15d396efd90", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling assert_approx_eq v1.1.0
[INFO] [stderr]    Compiling chapter_8_exercises v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `assert_approx_eq::assert_approx_eq`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use assert_approx_eq::assert_approx_eq;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0601]: `main` function not found in crate `chapter_8_exercises`
[INFO] [stdout]    --> src/main.rs:3:1
[INFO] [stdout]     |
[INFO] [stdout] 3   | / use std::collections::HashMap;
[INFO] [stdout] 4   | |
[INFO] [stdout] 5   | | use assert_approx_eq::assert_approx_eq;
[INFO] [stdout] 6   | |
[INFO] [stdout] ...   |
[INFO] [stdout] 176 | |
[INFO] [stdout] 177 | | }
[INFO] [stdout]     | |_^ consider adding a `main` function to `src/main.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chapter_8_exercises` due to 2 previous errors; 1 warning emitted
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a31d2fba63a438b0f2efd430b021ee4fbcf4aeaf44c9b83f48dee15d396efd90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a31d2fba63a438b0f2efd430b021ee4fbcf4aeaf44c9b83f48dee15d396efd90", kill_on_drop: false }`
[INFO] [stdout] a31d2fba63a438b0f2efd430b021ee4fbcf4aeaf44c9b83f48dee15d396efd90