[INFO] cloning repository https://github.com/jakobht/sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jakobht/sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakobht%2Fsudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakobht%2Fsudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 269e810eccb130cf9310e0ae9bcbced0717e9816
[INFO] testing jakobht/sudoku against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakobht%2Fsudoku" "/workspace/builds/worker-106/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-106/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jakobht/sudoku on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jakobht/sudoku
[INFO] finished tweaking git repo https://github.com/jakobht/sudoku
[INFO] tweaked toml for git repo https://github.com/jakobht/sudoku written to /workspace/builds/worker-106/source/Cargo.toml
[INFO] crate git repo https://github.com/jakobht/sudoku already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-106/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-106/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e2ccca7abf3523d7be40397644117ed55c1d2c4bdd9173f028c64da2c0add911
[INFO] running `Command { std: "docker" "start" "-a" "e2ccca7abf3523d7be40397644117ed55c1d2c4bdd9173f028c64da2c0add911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e2ccca7abf3523d7be40397644117ed55c1d2c4bdd9173f028c64da2c0add911", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2ccca7abf3523d7be40397644117ed55c1d2c4bdd9173f028c64da2c0add911", kill_on_drop: false }`
[INFO] [stdout] e2ccca7abf3523d7be40397644117ed55c1d2c4bdd9173f028c64da2c0add911
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-106/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-106/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8a807e979f6cd04e15645385c0b5b8fb8b1ed58a7a0e990f3c7959a78a2daec
[INFO] running `Command { std: "docker" "start" "-a" "b8a807e979f6cd04e15645385c0b5b8fb8b1ed58a7a0e990f3c7959a78a2daec", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sudoku` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "b8a807e979f6cd04e15645385c0b5b8fb8b1ed58a7a0e990f3c7959a78a2daec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8a807e979f6cd04e15645385c0b5b8fb8b1ed58a7a0e990f3c7959a78a2daec", kill_on_drop: false }`
[INFO] [stdout] b8a807e979f6cd04e15645385c0b5b8fb8b1ed58a7a0e990f3c7959a78a2daec