[INFO] fetching crate rustc_plugin 0.14.3-nightly-2025-08-20...
[INFO] testing rustc_plugin-0.14.3-nightly-2025-08-20 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate rustc_plugin 0.14.3-nightly-2025-08-20 into /workspace/builds/worker-0-tc2/source
[INFO] removed /workspace/builds/worker-0-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate rustc_plugin 0.14.3-nightly-2025-08-20
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate rustc_plugin 0.14.3-nightly-2025-08-20
[INFO] tweaked toml for crates.io crate rustc_plugin 0.14.3-nightly-2025-08-20 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rustc_plugin 0.14.3-nightly-2025-08-20 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 rustc_plugin 0.14.3-nightly-2025-08-20 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] 8158c0c37d0dbdf0cde0513b23a142ff3f8e43fbdb609c4828c7caea2876f8fb
[INFO] running `Command { std: "docker" "start" "-a" "8158c0c37d0dbdf0cde0513b23a142ff3f8e43fbdb609c4828c7caea2876f8fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8158c0c37d0dbdf0cde0513b23a142ff3f8e43fbdb609c4828c7caea2876f8fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8158c0c37d0dbdf0cde0513b23a142ff3f8e43fbdb609c4828c7caea2876f8fb", kill_on_drop: false }`
[INFO] [stdout] 8158c0c37d0dbdf0cde0513b23a142ff3f8e43fbdb609c4828c7caea2876f8fb
[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] c706b46f2847b8d711e843a0d94135fdf44d4f09bbe02bdd561cd6f740123fcc
[INFO] running `Command { std: "docker" "start" "-a" "c706b46f2847b8d711e843a0d94135fdf44d4f09bbe02bdd561cd6f740123fcc", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.227
[INFO] [stderr]    Compiling serde v1.0.227
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling equivalent v1.0.2
[INFO] [stderr]    Compiling hashbrown v0.16.0
[INFO] [stderr]    Compiling winnow v0.5.40
[INFO] [stderr]    Compiling camino v1.2.0
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling rustc_tools_util v0.1.1
[INFO] [stderr]    Compiling indexmap v2.11.4
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling semver v1.0.27
[INFO] [stderr]    Compiling serde_derive v1.0.227
[INFO] [stderr]    Compiling serde_spanned v0.6.9
[INFO] [stderr]    Compiling toml_datetime v0.6.11
[INFO] [stderr]    Compiling toml_edit v0.19.15
[INFO] [stderr]    Compiling toml v0.7.8
[INFO] [stderr]    Compiling rustc_plugin v0.14.3-nightly-2025-08-20 (/opt/rustwide/workdir)
[INFO] [stdout] error: couldn't read `rust-toolchain.toml`: No such file or directory (os error 2)
[INFO] [stdout]  --> build.rs:2:24
[INFO] [stdout]   |
[INFO] [stdout] 2 |   let toolchain_toml = include_str!("rust-toolchain.toml");
[INFO] [stdout]   |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc_plugin` (build script) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "c706b46f2847b8d711e843a0d94135fdf44d4f09bbe02bdd561cd6f740123fcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c706b46f2847b8d711e843a0d94135fdf44d4f09bbe02bdd561cd6f740123fcc", kill_on_drop: false }`
[INFO] [stdout] c706b46f2847b8d711e843a0d94135fdf44d4f09bbe02bdd561cd6f740123fcc