[INFO] fetching crate ringboard-x11 0.15.0...
[INFO] testing ringboard-x11-0.15.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate ringboard-x11 0.15.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate ringboard-x11 0.15.0
[INFO] finished tweaking crates.io crate ringboard-x11 0.15.0
[INFO] tweaked toml for crates.io crate ringboard-x11 0.15.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ringboard-x11 0.15.0 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ringboard-x11 0.15.0 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-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39663c40c45450df5b0b634b2eb389f2e16ca272bb0c69123c1dc876cd0a26ee
[INFO] running `Command { std: "docker" "start" "-a" "39663c40c45450df5b0b634b2eb389f2e16ca272bb0c69123c1dc876cd0a26ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39663c40c45450df5b0b634b2eb389f2e16ca272bb0c69123c1dc876cd0a26ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39663c40c45450df5b0b634b2eb389f2e16ca272bb0c69123c1dc876cd0a26ee", kill_on_drop: false }`
[INFO] [stdout] 39663c40c45450df5b0b634b2eb389f2e16ca272bb0c69123c1dc876cd0a26ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe4e1bf5a4f8efaf9e97db27c76b61cbfe109ff57310768aa92af40659bf674c
[INFO] running `Command { std: "docker" "start" "-a" "fe4e1bf5a4f8efaf9e97db27c76b61cbfe109ff57310768aa92af40659bf674c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling unicode-ident v1.0.24
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling libc v0.2.184
[INFO] [stderr]    Compiling semver v1.0.28
[INFO] [stderr]    Compiling rustix v1.1.4
[INFO] [stderr]    Compiling memchr v2.8.0
[INFO] [stderr]    Compiling bitflags v2.11.0
[INFO] [stderr]    Compiling linux-raw-sys v0.12.1
[INFO] [stderr]    Compiling thiserror v2.0.18
[INFO] [stderr]    Compiling option-ext v0.2.0
[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling regex-syntax v0.8.10
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]    Compiling log v0.4.29
[INFO] [stderr]    Compiling utf8parse v0.2.2
[INFO] [stderr]    Compiling is_terminal_polyfill v1.70.2
[INFO] [stderr]    Compiling anstyle-parse v1.0.0
[INFO] [stderr]    Compiling anstyle v1.0.14
[INFO] [stderr]    Compiling winnow v1.0.1
[INFO] [stderr]    Compiling colorchoice v1.0.5
[INFO] [stderr]    Compiling arrayvec v0.7.6
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling anstyle-query v1.1.5
[INFO] [stderr]    Compiling itoa v1.0.18
[INFO] [stderr]    Compiling rustc-hash v2.1.2
[INFO] [stderr]    Compiling anstream v1.0.0
[INFO] [stderr]    Compiling x11rb-protocol v0.13.2
[INFO] [stderr]    Compiling jiff v0.2.23
[INFO] [stderr]    Compiling error-stack v0.7.0
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling toml_parser v1.1.2+spec-1.1.0
[INFO] [stderr]    Compiling aho-corasick v1.1.4
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling regex-automata v0.4.14
[INFO] [stderr]    Compiling dirs-sys v0.5.0
[INFO] [stderr]    Compiling dirs v6.0.0
[INFO] [stderr]    Compiling thiserror-impl v2.0.18
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling serde_spanned v1.1.1
[INFO] [stderr]    Compiling toml_datetime v1.1.1+spec-1.1.0
[INFO] [stderr]    Compiling toml v1.1.2+spec-1.1.0
[INFO] [stderr]    Compiling regex v1.12.3
[INFO] [stderr]    Compiling env_filter v1.0.1
[INFO] [stderr]    Compiling env_logger v0.11.10
[INFO] [stderr]    Compiling stable-type v0.1.1
[INFO] [stderr]    Compiling clipboard-history-core v0.15.0
[INFO] [stderr]    Compiling gethostname v1.1.0
[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-0.15.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_io_borrowed_buf)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling x11rb v0.13.2
[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" "fe4e1bf5a4f8efaf9e97db27c76b61cbfe109ff57310768aa92af40659bf674c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe4e1bf5a4f8efaf9e97db27c76b61cbfe109ff57310768aa92af40659bf674c", kill_on_drop: false }`
[INFO] [stdout] fe4e1bf5a4f8efaf9e97db27c76b61cbfe109ff57310768aa92af40659bf674c
