[INFO] fetching crate vgabuf_err 0.1.0...
[INFO] testing vgabuf_err-0.1.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate vgabuf_err 0.1.0 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate vgabuf_err 0.1.0
[INFO] finished tweaking crates.io crate vgabuf_err 0.1.0
[INFO] tweaked toml for crates.io crate vgabuf_err 0.1.0 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate vgabuf_err 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 01b7c111c112b79cddb4ff2afdb922568f52a7eff77bb0cc1c3f0d7b6667a2d2
[INFO] running `Command { std: "docker" "start" "-a" "01b7c111c112b79cddb4ff2afdb922568f52a7eff77bb0cc1c3f0d7b6667a2d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "01b7c111c112b79cddb4ff2afdb922568f52a7eff77bb0cc1c3f0d7b6667a2d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01b7c111c112b79cddb4ff2afdb922568f52a7eff77bb0cc1c3f0d7b6667a2d2", kill_on_drop: false }`
[INFO] [stdout] 01b7c111c112b79cddb4ff2afdb922568f52a7eff77bb0cc1c3f0d7b6667a2d2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 1cbe1c5dbaa8f47492b80fe476f54a8aed4d7f411827c25426756d71be292269
[INFO] running `Command { std: "docker" "start" "-a" "1cbe1c5dbaa8f47492b80fe476f54a8aed4d7f411827c25426756d71be292269", kill_on_drop: false }`
[INFO] [stderr]    Compiling vgabuf_err 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(decl_macro)]
[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 `vgabuf_err` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "1cbe1c5dbaa8f47492b80fe476f54a8aed4d7f411827c25426756d71be292269", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1cbe1c5dbaa8f47492b80fe476f54a8aed4d7f411827c25426756d71be292269", kill_on_drop: false }`
[INFO] [stdout] 1cbe1c5dbaa8f47492b80fe476f54a8aed4d7f411827c25426756d71be292269