[INFO] fetching crate nibblecode 0.1.0...
[INFO] testing nibblecode-0.1.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate nibblecode 0.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate nibblecode 0.1.0
[INFO] finished tweaking crates.io crate nibblecode 0.1.0
[INFO] tweaked toml for crates.io crate nibblecode 0.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate nibblecode 0.1.0 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 crates.io crate nibblecode 0.1.0 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 2c66b2db65e7e0a3d6bdaf9c75654ccb5ea6e0090c6fb5ac237bee22eb5c5fa8
[INFO] running `Command { std: "docker" "start" "-a" "2c66b2db65e7e0a3d6bdaf9c75654ccb5ea6e0090c6fb5ac237bee22eb5c5fa8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c66b2db65e7e0a3d6bdaf9c75654ccb5ea6e0090c6fb5ac237bee22eb5c5fa8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c66b2db65e7e0a3d6bdaf9c75654ccb5ea6e0090c6fb5ac237bee22eb5c5fa8", kill_on_drop: false }`
[INFO] [stdout] 2c66b2db65e7e0a3d6bdaf9c75654ccb5ea6e0090c6fb5ac237bee22eb5c5fa8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 804e0166cf3dafd4b9f93095868843f1c7c106ab835bcdc9966c1e1e30681093
[INFO] running `Command { std: "docker" "start" "-a" "804e0166cf3dafd4b9f93095868843f1c7c106ab835bcdc9966c1e1e30681093", kill_on_drop: false }`
[INFO] [stderr]    Compiling rend v0.5.2
[INFO] [stderr]    Compiling syn v2.0.102
[INFO] [stderr]    Compiling nibblecode_derive v0.1.0
[INFO] [stderr]    Compiling nibblecode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     allocator_api,
[INFO] [stdout] 3 | |     maybe_uninit_slice,
[INFO] [stdout] 4 | |     offset_of_enum,
[INFO] [stdout] 5 | |     ptr_alignment_type,
[INFO] [stdout] 6 | |     ptr_metadata
[INFO] [stdout] 7 | | )]
[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 `nibblecode` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "804e0166cf3dafd4b9f93095868843f1c7c106ab835bcdc9966c1e1e30681093", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "804e0166cf3dafd4b9f93095868843f1c7c106ab835bcdc9966c1e1e30681093", kill_on_drop: false }`
[INFO] [stdout] 804e0166cf3dafd4b9f93095868843f1c7c106ab835bcdc9966c1e1e30681093