[INFO] fetching crate ffgen 0.3.5...
[INFO] testing ffgen-0.3.5 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate ffgen 0.3.5 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate ffgen 0.3.5
[INFO] finished tweaking crates.io crate ffgen 0.3.5
[INFO] tweaked toml for crates.io crate ffgen 0.3.5 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ffgen 0.3.5 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 ffgen 0.3.5 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-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c6be44f416e950c564f9569f0eabc8a5ea8357a68bc04b3e700d265fc768ece2
[INFO] running `Command { std: "docker" "start" "-a" "c6be44f416e950c564f9569f0eabc8a5ea8357a68bc04b3e700d265fc768ece2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c6be44f416e950c564f9569f0eabc8a5ea8357a68bc04b3e700d265fc768ece2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6be44f416e950c564f9569f0eabc8a5ea8357a68bc04b3e700d265fc768ece2", kill_on_drop: false }`
[INFO] [stdout] c6be44f416e950c564f9569f0eabc8a5ea8357a68bc04b3e700d265fc768ece2
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57e6dbd70b38926dcccea3fdb64a82232679377b6e40c478051b5a3313fb94a7
[INFO] running `Command { std: "docker" "start" "-a" "57e6dbd70b38926dcccea3fdb64a82232679377b6e40c478051b5a3313fb94a7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.84
[INFO] [stderr]    Compiling libc v0.2.112
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.133
[INFO] [stderr]    Compiling serde v1.0.133
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling anyhow v1.0.52
[INFO] [stderr]    Compiling termcolor v1.1.2
[INFO] [stderr]    Compiling ryu v1.0.9
[INFO] [stderr]    Compiling ppv-lite86 v0.2.16
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]    Compiling serde_json v1.0.74
[INFO] [stderr]    Compiling linked-hash-map v0.5.4
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling erased-serde v0.3.17
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling itoa v1.0.1
[INFO] [stderr]    Compiling quote v1.0.14
[INFO] [stderr]    Compiling terminal_size v0.1.17
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling textwrap v0.14.2
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling os_str_bytes v6.0.0
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling crypto-common v0.1.1
[INFO] [stderr]    Compiling block-buffer v0.10.0
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling digest v0.10.1
[INFO] [stderr]    Compiling md-5 v0.10.0
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling clap_derive v3.0.0
[INFO] [stderr]    Compiling strum_macros v0.23.1
[INFO] [stderr]    Compiling strum v0.23.0
[INFO] [stderr]    Compiling clap v3.0.1
[INFO] [stderr]    Compiling clap_complete v3.0.1
[INFO] [stderr]    Compiling ffgen v0.3.5 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling bstr v0.2.17
[INFO] [stderr]    Compiling serde_yaml v0.8.23
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling fake v2.4.3
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(trait_alias)]
[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 `ffgen` (bin "ffgen") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "57e6dbd70b38926dcccea3fdb64a82232679377b6e40c478051b5a3313fb94a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57e6dbd70b38926dcccea3fdb64a82232679377b6e40c478051b5a3313fb94a7", kill_on_drop: false }`
[INFO] [stdout] 57e6dbd70b38926dcccea3fdb64a82232679377b6e40c478051b5a3313fb94a7