[INFO] fetching crate ra2m_cpn 0.1.0...
[INFO] testing ra2m_cpn-0.1.0 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate ra2m_cpn 0.1.0 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate ra2m_cpn 0.1.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate ra2m_cpn 0.1.0
[INFO] tweaked toml for crates.io crate ra2m_cpn 0.1.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ra2m_cpn 0.1.0 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 ra2m_cpn 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-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] 4444362f4f1c7f4883c59b951cb6f3577dd399e18185e53ecf359ea6b6aa6ebb
[INFO] running `Command { std: "docker" "start" "-a" "4444362f4f1c7f4883c59b951cb6f3577dd399e18185e53ecf359ea6b6aa6ebb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4444362f4f1c7f4883c59b951cb6f3577dd399e18185e53ecf359ea6b6aa6ebb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4444362f4f1c7f4883c59b951cb6f3577dd399e18185e53ecf359ea6b6aa6ebb", kill_on_drop: false }`
[INFO] [stdout] 4444362f4f1c7f4883c59b951cb6f3577dd399e18185e53ecf359ea6b6aa6ebb
[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] 3fb7357c6768f235a644df010852ceead9091b7b06ed6e28ce156b8863526013
[INFO] running `Command { std: "docker" "start" "-a" "3fb7357c6768f235a644df010852ceead9091b7b06ed6e28ce156b8863526013", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.114
[INFO] [stderr]    Compiling libc v0.2.180
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling crossbeam-channel v0.5.15
[INFO] [stderr]    Compiling zmij v1.0.13
[INFO] [stderr]    Compiling rustix v1.1.3
[INFO] [stderr]    Compiling nix v0.30.1
[INFO] [stderr]    Compiling proc-macro-error-attr2 v2.0.0
[INFO] [stderr]    Compiling linux-raw-sys v0.11.0
[INFO] [stderr]    Compiling regex-automata v0.4.13
[INFO] [stderr]    Compiling thiserror v2.0.17
[INFO] [stderr]    Compiling chrono v0.4.42
[INFO] [stderr]    Compiling strum v0.24.1
[INFO] [stderr]    Compiling crossbeam v0.8.4
[INFO] [stderr]    Compiling getrandom v0.2.17
[INFO] [stderr]    Compiling mio v1.1.1
[INFO] [stderr]    Compiling parking_lot_core v0.9.12
[INFO] [stderr]    Compiling getrandom v0.3.4
[INFO] [stderr]    Compiling errno v0.3.14
[INFO] [stderr]    Compiling socket2 v0.6.1
[INFO] [stderr]    Compiling tempfile v3.24.0
[INFO] [stderr]    Compiling uuid v1.19.0
[INFO] [stderr]    Compiling parking_lot v0.12.5
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling signal-hook-registry v1.4.8
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling regex v1.12.2
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling ctrlc v3.5.1
[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/regex-1.12.2/src/lib.rs:1321:34
[INFO] [stdout]      |
[INFO] [stdout] 1321 | #![cfg_attr(feature = "pattern", feature(pattern))]
[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 `regex` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3fb7357c6768f235a644df010852ceead9091b7b06ed6e28ce156b8863526013", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fb7357c6768f235a644df010852ceead9091b7b06ed6e28ce156b8863526013", kill_on_drop: false }`
[INFO] [stdout] 3fb7357c6768f235a644df010852ceead9091b7b06ed6e28ce156b8863526013
