[INFO] fetching crate syntaxdot 0.4.1...
[INFO] testing syntaxdot-0.4.1 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate syntaxdot 0.4.1 into /workspace/builds/worker-111/source
[INFO] validating manifest of crates.io crate syntaxdot 0.4.1 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syntaxdot 0.4.1
[INFO] finished tweaking crates.io crate syntaxdot 0.4.1
[INFO] tweaked toml for crates.io crate syntaxdot 0.4.1 written to /workspace/builds/worker-111/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 571ad6a29b1142d68cd642491b8ece12247190cd21f46afda4f7f347bfb2026a
[INFO] running `Command { std: "docker" "start" "-a" "571ad6a29b1142d68cd642491b8ece12247190cd21f46afda4f7f347bfb2026a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "571ad6a29b1142d68cd642491b8ece12247190cd21f46afda4f7f347bfb2026a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "571ad6a29b1142d68cd642491b8ece12247190cd21f46afda4f7f347bfb2026a", kill_on_drop: false }`
[INFO] [stdout] 571ad6a29b1142d68cd642491b8ece12247190cd21f46afda4f7f347bfb2026a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-111/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 49feab60940dd9df6062a1f2ab925f2d74cec2b9b016ec421ce1f8a9a777ea2d
[INFO] running `Command { std: "docker" "start" "-a" "49feab60940dd9df6062a1f2ab925f2d74cec2b9b016ec421ce1f8a9a777ea2d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling anyhow v1.0.43
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling curl v0.4.38
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling fst v0.4.7
[INFO] [stderr]    Compiling fixedbitset v0.4.0
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling seqalign v0.2.2
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling libz-sys v1.1.3
[INFO] [stderr]    Compiling curl-sys v0.4.45+curl-7.78.0
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]    Compiling socket2 v0.4.1
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling matrixmultiply v0.3.1
[INFO] [stderr]    Compiling itertools v0.10.1
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling petgraph v0.6.0
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand_xorshift v0.3.0
[INFO] [stderr]    Compiling sentencepiece-sys v0.7.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling ordered-float v2.8.0
[INFO] [stderr]    Compiling ndarray v0.15.3
[INFO] [stderr]    Compiling bzip2 v0.4.3
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling udgraph v0.7.0
[INFO] [stderr] error: could not compile `syn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name syn --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-1.0.76/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="extra-traits"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' -C metadata=c6242829b6fd3909 -C extra-filename=-c6242829b6fd3909 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-699bbece778063bb.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-0758f46bd75f90b0.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-11d097b41f2e60a4.rmeta --cap-lints allow --cap-lints=warn --cfg syn_disable_nightly_tests` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "49feab60940dd9df6062a1f2ab925f2d74cec2b9b016ec421ce1f8a9a777ea2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49feab60940dd9df6062a1f2ab925f2d74cec2b9b016ec421ce1f8a9a777ea2d", kill_on_drop: false }`
[INFO] [stdout] 49feab60940dd9df6062a1f2ab925f2d74cec2b9b016ec421ce1f8a9a777ea2d