[INFO] fetching crate syndicate-tools 0.21.0-rc.0...
[INFO] testing syndicate-tools-0.21.0-rc.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate syndicate-tools 0.21.0-rc.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate syndicate-tools 0.21.0-rc.0
[INFO] finished tweaking crates.io crate syndicate-tools 0.21.0-rc.0
[INFO] tweaked toml for crates.io crate syndicate-tools 0.21.0-rc.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate syndicate-tools 0.21.0-rc.0 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 syndicate-tools 0.21.0-rc.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-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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 8c0051704803bb9b611fee8ff3b82576298dd406758f0c9e54a16e3f95c22b1b
[INFO] running `Command { std: "docker" "start" "-a" "8c0051704803bb9b611fee8ff3b82576298dd406758f0c9e54a16e3f95c22b1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c0051704803bb9b611fee8ff3b82576298dd406758f0c9e54a16e3f95c22b1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c0051704803bb9b611fee8ff3b82576298dd406758f0c9e54a16e3f95c22b1b", kill_on_drop: false }`
[INFO] [stdout] 8c0051704803bb9b611fee8ff3b82576298dd406758f0c9e54a16e3f95c22b1b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 76a36d5eb8a6b0c0ce4bdf60c77367a2ec04cb14f9750820447783de03c37ddf
[INFO] running `Command { std: "docker" "start" "-a" "76a36d5eb8a6b0c0ce4bdf60c77367a2ec04cb14f9750820447783de03c37ddf", kill_on_drop: false }`
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling unicode-segmentation v1.12.0
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling memchr v2.7.4
[INFO] [stderr]    Compiling dtoa v0.4.8
[INFO] [stderr]    Compiling bytemuck v1.22.0
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling once_cell v1.21.1
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling glob v0.3.2
[INFO] [stderr]    Compiling cipher v0.3.0
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling universal-hash v0.4.1
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling regex v1.11.1
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling tracing-core v0.1.33
[INFO] [stderr]    Compiling log v0.4.26
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling smallvec v1.14.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling polyval v0.5.3
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling aead v0.4.3
[INFO] [stderr]    Compiling iana-time-zone v0.1.61
[INFO] [stderr]    Compiling clap_builder v4.5.32
[INFO] [stderr]    Compiling ghash v0.4.4
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling matchers v0.0.1
[INFO] [stderr]    Compiling blake2 v0.10.6
[INFO] [stderr]    Compiling thread_local v1.1.8
[INFO] [stderr]    Compiling poly1305 v0.7.2
[INFO] [stderr]    Compiling aes v0.7.5
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling ctr v0.8.0
[INFO] [stderr]    Compiling tracing-log v0.1.4
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling noise-protocol v0.1.4
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling hmac v0.12.1
[INFO] [stderr]    Compiling sha2 v0.10.8
[INFO] [stderr]    Compiling aes-gcm v0.9.4
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling chrono v0.4.40
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling regex-automata v0.4.9
[INFO] [stderr]    Compiling preserves v5.0.0-rc.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling serde_json v1.0.140
[INFO] [stderr]    Compiling tracing-serde v0.1.3
[INFO] [stderr]    Compiling structopt v0.3.26
[INFO] [stderr]    Compiling preserves-schema v6.0.0-rc.4
[INFO] [stderr]    Compiling zeroize_derive v1.4.2
[INFO] [stderr]    Compiling tracing-attributes v0.1.28
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling tokio-macros v2.5.0
[INFO] [stderr]    Compiling pin-project-internal v1.1.10
[INFO] [stderr]    Compiling clap_derive v4.5.32
[INFO] [stderr]    Compiling zeroize v1.3.0
[INFO] [stderr]    Compiling curve25519-dalek v3.2.1
[INFO] [stderr]    Compiling chacha20 v0.8.2
[INFO] [stderr]    Compiling tokio v1.44.1
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling chacha20poly1305 v0.9.1
[INFO] [stderr]    Compiling pin-project v1.1.10
[INFO] [stderr]    Compiling x25519-dalek v1.2.0
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling noise-rust-crypto v0.5.0
[INFO] [stderr]    Compiling tracing-futures v0.2.5
[INFO] [stderr]    Compiling tracing-subscriber v0.2.25
[INFO] [stderr]    Compiling clap v4.5.32
[INFO] [stderr]    Compiling clap_complete v4.5.47
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling tokio-util v0.6.10
[INFO] [stderr]    Compiling syndicate-schema-plugin v0.12.0-rc.0
[INFO] [stderr]    Compiling syndicate v0.44.0-rc.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/syndicate-0.44.0-rc.0/src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(min_specialization)]
[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 `syndicate` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "76a36d5eb8a6b0c0ce4bdf60c77367a2ec04cb14f9750820447783de03c37ddf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76a36d5eb8a6b0c0ce4bdf60c77367a2ec04cb14f9750820447783de03c37ddf", kill_on_drop: false }`
[INFO] [stdout] 76a36d5eb8a6b0c0ce4bdf60c77367a2ec04cb14f9750820447783de03c37ddf