[INFO] fetching crate syn 1.0.29...
[INFO] checking syn-1.0.29 against master#74e80468347471779be6060d8d7d6d04e98e467f for pr-72788
[INFO] extracting crate syn 1.0.29 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate syn 1.0.29 on toolchain 74e80468347471779be6060d8d7d6d04e98e467f
[INFO] running `"/workspace/cargo-home/bin/cargo" "+74e80468347471779be6060d8d7d6d04e98e467f" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate syn 1.0.29
[INFO] finished tweaking crates.io crate syn 1.0.29
[INFO] tweaked toml for crates.io crate syn 1.0.29 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+74e80468347471779be6060d8d7d6d04e98e467f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+74e80468347471779be6060d8d7d6d04e98e467f" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+74e80468347471779be6060d8d7d6d04e98e467f" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 27c5e9bfeae07e6adecca8df09647487ad06720942b68e722b11eadfa6a65ca2
[INFO] running `"docker" "start" "-a" "27c5e9bfeae07e6adecca8df09647487ad06720942b68e722b11eadfa6a65ca2"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling serde v1.0.111
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking dtoa v0.4.5
[INFO] [stderr]    Compiling rayon-core v1.7.0
[INFO] [stderr]     Checking linked-hash-map v0.5.3
[INFO] [stderr]    Compiling encoding_rs v0.8.23
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]    Compiling syn v1.0.29 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking either v1.5.3
[INFO] [stderr]     Checking base64 v0.12.1
[INFO] [stderr]     Checking termcolor v1.1.0
[INFO] [stderr]     Checking syn-test-suite v0.0.0+test
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr] error: expected item, found `@`
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-test-suite-0.0.0+test/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | @
[INFO] [stderr]   | ^ expected item
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `syn-test-suite`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "27c5e9bfeae07e6adecca8df09647487ad06720942b68e722b11eadfa6a65ca2"`
[INFO] running `"docker" "rm" "-f" "27c5e9bfeae07e6adecca8df09647487ad06720942b68e722b11eadfa6a65ca2"`
[INFO] [stdout] 27c5e9bfeae07e6adecca8df09647487ad06720942b68e722b11eadfa6a65ca2