[INFO] cloning repository https://github.com/rylmovuk/sudoku-procrastination-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rylmovuk/sudoku-procrastination-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylmovuk%2Fsudoku-procrastination-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylmovuk%2Fsudoku-procrastination-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3dd850fa04b329f8db037acc692c9193e6a7fb13
[INFO] testing rylmovuk/sudoku-procrastination-solver against beta-2025-10-28 for beta-1.92-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frylmovuk%2Fsudoku-procrastination-solver" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/rylmovuk/sudoku-procrastination-solver
[INFO] finished tweaking git repo https://github.com/rylmovuk/sudoku-procrastination-solver
[INFO] tweaked toml for git repo https://github.com/rylmovuk/sudoku-procrastination-solver written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/rylmovuk/sudoku-procrastination-solver on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/rylmovuk/sudoku-procrastination-solver 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" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2ec8a8bf0abe416be5227d5b1dc861797b5182395f2cac033212f23dd517e8f
[INFO] running `Command { std: "docker" "start" "-a" "a2ec8a8bf0abe416be5227d5b1dc861797b5182395f2cac033212f23dd517e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2ec8a8bf0abe416be5227d5b1dc861797b5182395f2cac033212f23dd517e8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2ec8a8bf0abe416be5227d5b1dc861797b5182395f2cac033212f23dd517e8f", kill_on_drop: false }`
[INFO] [stdout] a2ec8a8bf0abe416be5227d5b1dc861797b5182395f2cac033212f23dd517e8f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 48e405a2f2b7afae43acb8a5c057f800ebf490767989a9cd18576eaf3f433ff2
[INFO] running `Command { std: "docker" "start" "-a" "48e405a2f2b7afae43acb8a5c057f800ebf490767989a9cd18576eaf3f433ff2", kill_on_drop: false }`
[INFO] [stderr]    Compiling sudoku-procrastination-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iter_intersperse)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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-procrastination-solver` (bin "sudoku-procrastination-solver") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "48e405a2f2b7afae43acb8a5c057f800ebf490767989a9cd18576eaf3f433ff2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48e405a2f2b7afae43acb8a5c057f800ebf490767989a9cd18576eaf3f433ff2", kill_on_drop: false }`
[INFO] [stdout] 48e405a2f2b7afae43acb8a5c057f800ebf490767989a9cd18576eaf3f433ff2