[INFO] fetching crate rockscrew 0.2.1...
[INFO] testing rockscrew-0.2.1 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate rockscrew 0.2.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate rockscrew 0.2.1
[INFO] finished tweaking crates.io crate rockscrew 0.2.1
[INFO] tweaked toml for crates.io crate rockscrew 0.2.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rockscrew 0.2.1 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 rockscrew 0.2.1 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b456f16135e995636d4293c63ad180df55be580a1c9d46ef25a73ac12ef3ad7c
[INFO] running `Command { std: "docker" "start" "-a" "b456f16135e995636d4293c63ad180df55be580a1c9d46ef25a73ac12ef3ad7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b456f16135e995636d4293c63ad180df55be580a1c9d46ef25a73ac12ef3ad7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b456f16135e995636d4293c63ad180df55be580a1c9d46ef25a73ac12ef3ad7c", kill_on_drop: false }`
[INFO] [stdout] b456f16135e995636d4293c63ad180df55be580a1c9d46ef25a73ac12ef3ad7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b17226ce8cada110acd4f2dc9899f3670b23363cc9a79a7ef6542591eab68ee0
[INFO] running `Command { std: "docker" "start" "-a" "b17226ce8cada110acd4f2dc9899f3670b23363cc9a79a7ef6542591eab68ee0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling unicode-ident v1.0.14
[INFO] [stderr]    Compiling libc v0.2.166
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling pin-project-lite v0.2.15
[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling io-uring v0.7.2
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling arrayvec v0.7.6
[INFO] [stderr]    Compiling tracing-core v0.1.33
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling bitflags v2.6.0
[INFO] [stderr]    Compiling compio-driver v0.6.1
[INFO] [stderr]    Compiling hashbrown v0.15.2
[INFO] [stderr]    Compiling equivalent v1.0.1
[INFO] [stderr]    Compiling winnow v0.6.20
[INFO] [stderr]    Compiling async-task v4.7.1
[INFO] [stderr]    Compiling scoped-tls v1.0.1
[INFO] [stderr]    Compiling toml_datetime v0.6.8
[INFO] [stderr]    Compiling once_cell v1.20.2
[INFO] [stderr]    Compiling compio-fs v0.6.0
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling httparse v1.9.5
[INFO] [stderr]    Compiling base64 v0.22.1
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling compio-log v0.1.0
[INFO] [stderr]    Compiling indexmap v2.6.0
[INFO] [stderr]    Compiling crossbeam-channel v0.5.13
[INFO] [stderr]    Compiling crossbeam-queue v0.3.11
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.89
[INFO] [stderr]    Compiling compio-buf v0.5.1
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling os_pipe v1.2.1
[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/compio-buf-0.5.1/src/lib.rs:8:40
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![cfg_attr(feature = "allocator_api", feature(allocator_api))]
[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 `compio-buf` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b17226ce8cada110acd4f2dc9899f3670b23363cc9a79a7ef6542591eab68ee0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b17226ce8cada110acd4f2dc9899f3670b23363cc9a79a7ef6542591eab68ee0", kill_on_drop: false }`
[INFO] [stdout] b17226ce8cada110acd4f2dc9899f3670b23363cc9a79a7ef6542591eab68ee0
