[INFO] fetching crate ringboard-x11 0.12.2...
[INFO] testing ringboard-x11-0.12.2 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate ringboard-x11 0.12.2 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate ringboard-x11 0.12.2
[INFO] finished tweaking crates.io crate ringboard-x11 0.12.2
[INFO] tweaked toml for crates.io crate ringboard-x11 0.12.2 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ringboard-x11 0.12.2 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 ringboard-x11 0.12.2 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] [stderr]     Blocking waiting for file lock on package cache
[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] 9be38a3cecc8ab735bd9c40044cfaadc93550d61be969fd6f37eaca3ac31496f
[INFO] running `Command { std: "docker" "start" "-a" "9be38a3cecc8ab735bd9c40044cfaadc93550d61be969fd6f37eaca3ac31496f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9be38a3cecc8ab735bd9c40044cfaadc93550d61be969fd6f37eaca3ac31496f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9be38a3cecc8ab735bd9c40044cfaadc93550d61be969fd6f37eaca3ac31496f", kill_on_drop: false }`
[INFO] [stdout] 9be38a3cecc8ab735bd9c40044cfaadc93550d61be969fd6f37eaca3ac31496f
[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] 2d95a01dbcb9eaeb7bd24c2951c0f3b2e4ac01fcb1d4832b93e74526531aba54
[INFO] running `Command { std: "docker" "start" "-a" "2d95a01dbcb9eaeb7bd24c2951c0f3b2e4ac01fcb1d4832b93e74526531aba54", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.26
[INFO] [stderr]    Compiling bitflags v2.9.2
[INFO] [stderr]    Compiling option-ext v0.2.0
[INFO] [stderr]    Compiling rustix v1.0.8
[INFO] [stderr]    Compiling thiserror v2.0.15
[INFO] [stderr]    Compiling log v0.4.27
[INFO] [stderr]    Compiling rustix v0.38.44
[INFO] [stderr]    Compiling linux-raw-sys v0.4.15
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling regex v1.11.1
[INFO] [stderr]    Compiling toml_parser v1.0.2
[INFO] [stderr]    Compiling x11rb-protocol v0.13.1
[INFO] [stderr]    Compiling dirs-sys v0.5.0
[INFO] [stderr]    Compiling dirs v6.0.0
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling env_filter v0.1.3
[INFO] [stderr]    Compiling error-stack v0.5.0
[INFO] [stderr]    Compiling env_logger v0.11.8
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling thiserror-impl v2.0.15
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling x11rb v0.13.1
[INFO] [stderr]    Compiling clipboard-history-core v0.12.2
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/clipboard-history-core-0.12.2/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_io_borrowed_buf)]
[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 `clipboard-history-core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "2d95a01dbcb9eaeb7bd24c2951c0f3b2e4ac01fcb1d4832b93e74526531aba54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d95a01dbcb9eaeb7bd24c2951c0f3b2e4ac01fcb1d4832b93e74526531aba54", kill_on_drop: false }`
[INFO] [stdout] 2d95a01dbcb9eaeb7bd24c2951c0f3b2e4ac01fcb1d4832b93e74526531aba54