[INFO] fetching crate grappler 0.1.10...
[INFO] testing grappler-0.1.10 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate grappler 0.1.10 into /workspace/builds/worker-5-tc2/source
[INFO] removed /workspace/builds/worker-5-tc2/source/.cargo/config.toml
[INFO] started tweaking crates.io crate grappler 0.1.10
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate grappler 0.1.10
[INFO] tweaked toml for crates.io crate grappler 0.1.10 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate grappler 0.1.10 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 109 packages to latest compatible versions
[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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 9edd14ce47740b06605db21800dee356c472c7889d6d613872ce5916f16e26f5
[INFO] running `Command { std: "docker" "start" "-a" "9edd14ce47740b06605db21800dee356c472c7889d6d613872ce5916f16e26f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9edd14ce47740b06605db21800dee356c472c7889d6d613872ce5916f16e26f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9edd14ce47740b06605db21800dee356c472c7889d6d613872ce5916f16e26f5", kill_on_drop: false }`
[INFO] [stdout] 9edd14ce47740b06605db21800dee356c472c7889d6d613872ce5916f16e26f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 3db5b1e90b6275e0cec1043dc9bb44b7c2496f00d19c31a1dc18504f0bc0d17f
[INFO] running `Command { std: "docker" "start" "-a" "3db5b1e90b6275e0cec1043dc9bb44b7c2496f00d19c31a1dc18504f0bc0d17f", kill_on_drop: false }`
[INFO] [stderr]    Compiling hashbrown v0.16.0
[INFO] [stderr]    Compiling winnow v0.5.40
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling regex-syntax v0.8.6
[INFO] [stderr]    Compiling iced-x86 v1.21.0
[INFO] [stderr]    Compiling slice-pool2 v0.4.3
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling mmap-fixed-fixed v0.1.3
[INFO] [stderr]    Compiling region v3.0.2
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling indexmap v2.11.4
[INFO] [stderr]    Compiling regex-automata v0.4.11
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]    Compiling darling_core v0.20.11
[INFO] [stderr]    Compiling proc-macro-crate v1.3.1
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling ctor v0.2.9
[INFO] [stderr]    Compiling bitfield-struct v0.6.2
[INFO] [stderr]    Compiling skidscan-macros v0.1.2
[INFO] [stderr]    Compiling retour v0.4.0-alpha.4
[INFO] [stderr]    Compiling regex v1.11.3
[INFO] [stderr]    Compiling skidscan v2.0.1
[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/retour-0.4.0-alpha.4/src/lib.rs:5:3
[INFO] [stdout]   |
[INFO] [stdout] 5 |   feature(unboxed_closures, tuple_trait)
[INFO] [stdout]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling darling_macro v0.20.11
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling poggers v1.2.1
[INFO] [stderr]    Compiling darling v0.20.11
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `retour` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3db5b1e90b6275e0cec1043dc9bb44b7c2496f00d19c31a1dc18504f0bc0d17f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3db5b1e90b6275e0cec1043dc9bb44b7c2496f00d19c31a1dc18504f0bc0d17f", kill_on_drop: false }`
[INFO] [stdout] 3db5b1e90b6275e0cec1043dc9bb44b7c2496f00d19c31a1dc18504f0bc0d17f