[INFO] fetching crate signaldock-protocol 2026.5.0...
[INFO] fixing signaldock-protocol-2026.5.0 against try#622891a4e29178280638a6b63a8908bde2c0c854+cargoflags=-Zfix-edition=start=2015 for pr-157817-2
[INFO] extracting crate signaldock-protocol 2026.5.0 into /workspace/builds/worker-7-tc1/source
[INFO] started tweaking crates.io crate signaldock-protocol 2026.5.0
[INFO] finished tweaking crates.io crate signaldock-protocol 2026.5.0
[INFO] tweaked toml for crates.io crate signaldock-protocol 2026.5.0 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate signaldock-protocol 2026.5.0 on toolchain 622891a4e29178280638a6b63a8908bde2c0c854
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate signaldock-protocol 2026.5.0 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" "+622891a4e29178280638a6b63a8908bde2c0c854" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded signaldock-core v2026.5.0
[INFO] [stderr]   Downloaded lafs-core v2026.5.105
[INFO] [stderr]   Downloaded referencing v0.28.3
[INFO] [stderr]   Downloaded cleo-conduit-core v2026.5.105
[INFO] [stderr]   Downloaded fraction v0.15.4
[INFO] [stderr]   Downloaded jsonschema v0.28.3
[INFO] [stderr]   Downloaded cant-core v2026.5.105
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687
[INFO] running `Command { std: "docker" "start" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=" "-e" "RUSTDOCFLAGS=" "-w" "/opt/rustwide/workdir" "--user" "0:0" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687" "/opt/rustwide/cargo-home/bin/cargo" "+622891a4e29178280638a6b63a8908bde2c0c854" "fix" "--allow-no-vcs" "--allow-dirty" "--frozen" "--all" "--all-targets" "--message-format=json" "-Zfix-edition=start=2015", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-sink v0.3.32
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]     Checking serde_json v1.0.150
[INFO] [stderr]    Compiling ref-cast v1.0.25
[INFO] [stderr]     Checking tokio v1.52.3
[INFO] [stderr]     Checking uuid v1.23.1
[INFO] [stderr]     Checking borrow-or-share v0.2.4
[INFO] [stderr]     Checking num v0.4.3
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking fraction v0.15.4
[INFO] [stderr]     Checking futures-util v0.3.32
[INFO] [stderr]     Checking futures-channel v0.3.32
[INFO] [stderr]     Checking uuid-simd v0.8.0
[INFO] [stderr]    Compiling cant-core v2026.5.105
[INFO] [stderr] warning: cant-core@2026.5.105: cant-core build.rs: rustfmt exited exit status: 1 (error: 'rustfmt' is not installed for the custom toolchain '622891a4e29178280638a6b63a8908bde2c0c854'.
[INFO] [stderr] error: failed to run custom build command for `cant-core v2026.5.105`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/cant-core-dcd092728ba18370/build-script-build` (exit status: 1)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:rerun-if-changed=/opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/cant-core-2026.5.105/vendor/caamp/hook-mappings.json
[INFO] [stderr]   cargo:rerun-if-changed=build.rs
[INFO] [stderr]   cargo:warning=cant-core build.rs: rustfmt exited exit status: 1 (error: 'rustfmt' is not installed for the custom toolchain '622891a4e29178280638a6b63a8908bde2c0c854'.
[INFO] [stderr]   note: this is a custom toolchain, which cannot use `rustup component add`
[INFO] [stderr]   help: if you built this toolchain from source, and used `rustup toolchain link`, then you may be able to build the component with `x.py`); emitting unformatted events.rs
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr]   cargo:error=cant-core build.rs: failed to write /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/cant-core-2026.5.105/src/generated/events.rs: Read-only file system (os error 30)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687", kill_on_drop: false }`
[INFO] [stdout] 944c35bba20e7d133a1467802159e1862178be45a1c439148529de97b106a687
