[INFO] fetching crate assertor 0.0.4...
[INFO] testing assertor-0.0.4 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate assertor 0.0.4 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate assertor 0.0.4
[INFO] finished tweaking crates.io crate assertor 0.0.4
[INFO] tweaked toml for crates.io crate assertor 0.0.4 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate assertor 0.0.4 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 assertor 0.0.4 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] 1420c8b18cfffd01554a043ce198ee491d9bc70bd70827aa7fb9246a1c7b78e2
[INFO] running `Command { std: "docker" "start" "-a" "1420c8b18cfffd01554a043ce198ee491d9bc70bd70827aa7fb9246a1c7b78e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1420c8b18cfffd01554a043ce198ee491d9bc70bd70827aa7fb9246a1c7b78e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1420c8b18cfffd01554a043ce198ee491d9bc70bd70827aa7fb9246a1c7b78e2", kill_on_drop: false }`
[INFO] [stdout] 1420c8b18cfffd01554a043ce198ee491d9bc70bd70827aa7fb9246a1c7b78e2
[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] 054bba9b2f4ea23d5d280c4b17034620fb81f788170ee12f10005601e1437480
[INFO] running `Command { std: "docker" "start" "-a" "054bba9b2f4ea23d5d280c4b17034620fb81f788170ee12f10005601e1437480", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling assertor v0.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: the method `as_ref` exists for reference `&Cow<'_, T>`, but its trait bounds were not satisfied
[INFO] [stdout]   --> src/assertions/cow.rs:79:35
[INFO] [stdout]    |
[INFO] [stdout] 79 |         let value = self.actual().as_ref().to_owned();
[INFO] [stdout]    |                                   ^^^^^^ method cannot be called on `&Cow<'_, T>` due to unsatisfied trait bounds
[INFO] [stdout]    |
[INFO] [stdout]    = note: the following trait bounds were not satisfied:
[INFO] [stdout]            `Y: Borrow<T>`
[INFO] [stdout]            which is required by `Cow<'_, T>: AsRef<T>`
[INFO] [stdout]            `Cow<'_, T>: AsRef<_>`
[INFO] [stdout]            which is required by `&Cow<'_, T>: AsRef<_>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `assertor` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "054bba9b2f4ea23d5d280c4b17034620fb81f788170ee12f10005601e1437480", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "054bba9b2f4ea23d5d280c4b17034620fb81f788170ee12f10005601e1437480", kill_on_drop: false }`
[INFO] [stdout] 054bba9b2f4ea23d5d280c4b17034620fb81f788170ee12f10005601e1437480