[INFO] fetching crate signtensors 0.2.1...
[INFO] testing signtensors-0.2.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate signtensors 0.2.1 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate signtensors 0.2.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate signtensors 0.2.1
[INFO] tweaked toml for crates.io crate signtensors 0.2.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate signtensors 0.2.1 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate signtensors 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-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b682bf2168efaf43dd2ec657bfcfdfb79a9f5b932f31cffd612b5fb0cc493ae0
[INFO] running `Command { std: "docker" "start" "-a" "b682bf2168efaf43dd2ec657bfcfdfb79a9f5b932f31cffd612b5fb0cc493ae0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b682bf2168efaf43dd2ec657bfcfdfb79a9f5b932f31cffd612b5fb0cc493ae0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b682bf2168efaf43dd2ec657bfcfdfb79a9f5b932f31cffd612b5fb0cc493ae0", kill_on_drop: false }`
[INFO] [stdout] b682bf2168efaf43dd2ec657bfcfdfb79a9f5b932f31cffd612b5fb0cc493ae0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15c38866f05ad86cda0a18be7599692a82a789c4d3abb3e4c19cddeeb4b17ca2
[INFO] running `Command { std: "docker" "start" "-a" "15c38866f05ad86cda0a18be7599692a82a789c4d3abb3e4c19cddeeb4b17ca2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]    Compiling libc v0.2.169
[INFO] [stderr]    Compiling bytemuck v1.21.0
[INFO] [stderr]    Compiling nano-gemm-codegen v0.1.0
[INFO] [stderr]    Compiling reborrow v0.5.5
[INFO] [stderr]    Compiling thiserror v2.0.8
[INFO] [stderr]    Compiling paste v1.0.15
[INFO] [stderr]    Compiling either v1.13.0
[INFO] [stderr]    Compiling ucd-trie v0.1.7
[INFO] [stderr]    Compiling once_cell v1.20.2
[INFO] [stderr]    Compiling seq-macro v0.3.5
[INFO] [stderr]    Compiling raw-cpuid v10.7.0
[INFO] [stderr]    Compiling nano-gemm-core v0.1.0
[INFO] [stderr]    Compiling serde v1.0.216
[INFO] [stderr]    Compiling num-bigint v0.4.6
[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/bytemuck-1.21.0/src/lib.rs:16:3
[INFO] [stdout]    |
[INFO] [stdout] 16 |   feature(stdarch_x86_avx512)
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_json v1.0.133
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr]    Compiling matrixcompare-core v0.1.0
[INFO] [stderr] error: could not compile `bytemuck` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "15c38866f05ad86cda0a18be7599692a82a789c4d3abb3e4c19cddeeb4b17ca2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15c38866f05ad86cda0a18be7599692a82a789c4d3abb3e4c19cddeeb4b17ca2", kill_on_drop: false }`
[INFO] [stdout] 15c38866f05ad86cda0a18be7599692a82a789c4d3abb3e4c19cddeeb4b17ca2