[INFO] fetching crate mdbook-regex-replacer 0.1.0...
[INFO] checking mdbook-regex-replacer-0.1.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate mdbook-regex-replacer 0.1.0 into /workspace/builds/worker-44/source
[INFO] validating manifest of crates.io crate mdbook-regex-replacer 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdbook-regex-replacer 0.1.0
[INFO] finished tweaking crates.io crate mdbook-regex-replacer 0.1.0
[INFO] tweaked toml for crates.io crate mdbook-regex-replacer 0.1.0 written to /workspace/builds/worker-44/source/Cargo.toml
[INFO] crate crates.io crate mdbook-regex-replacer 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6713e534aaa36ea3ceeb9939b16236a422782940136c7013486f2945e12cdb7b
[INFO] running `Command { std: "docker" "start" "-a" "6713e534aaa36ea3ceeb9939b16236a422782940136c7013486f2945e12cdb7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6713e534aaa36ea3ceeb9939b16236a422782940136c7013486f2945e12cdb7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6713e534aaa36ea3ceeb9939b16236a422782940136c7013486f2945e12cdb7b", kill_on_drop: false }`
[INFO] [stdout] 6713e534aaa36ea3ceeb9939b16236a422782940136c7013486f2945e12cdb7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-44/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" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 332ace5637df92ee6af20753ed8834184500b5b110e890fb96518c511268ec0e
[INFO] running `Command { std: "docker" "start" "-a" "332ace5637df92ee6af20753ed8834184500b5b110e890fb96518c511268ec0e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.88
[INFO] [stderr]    Compiling syn v1.0.62
[INFO] [stderr]    Compiling serde v1.0.124
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.124
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking futures-core v0.3.13
[INFO] [stderr]     Checking utf-8 v0.7.5
[INFO] [stderr]     Checking futures-sink v0.3.13
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]     Checking new_debug_unreachable v1.0.4
[INFO] [stderr]     Checking mac v0.1.1
[INFO] [stderr]     Checking futures-task v0.3.13
[INFO] [stderr]    Compiling getrandom v0.2.2
[INFO] [stderr]     Checking precomputed-hash v0.1.1
[INFO] [stderr]    Compiling httparse v1.3.5
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]     Checking byteorder v1.4.2
[INFO] [stderr]     Checking cpuid-bool v0.1.2
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking once_cell v1.7.2
[INFO] [stderr]     Checking regex-syntax v0.6.22
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling pulldown-cmark v0.7.2
[INFO] [stderr]    Compiling anyhow v1.0.38
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking futures-io v0.3.13
[INFO] [stderr]     Checking dtoa v0.4.7
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking strum v0.18.0
[INFO] [stderr]     Checking ascii v0.9.3
[INFO] [stderr]     Checking quick-error v2.0.0
[INFO] [stderr]     Checking urlencoding v1.1.1
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking shlex v1.0.0
[INFO] [stderr]     Checking tinyvec v1.1.1
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]    Compiling indexmap v1.6.2
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking gitignore v1.0.7
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]     Checking unicode-normalization v0.1.17
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]     Checking aho-corasick v0.7.15
[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-1.0.62/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --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="fold"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit-mut"' -C metadata=e15aae478db831cf -C extra-filename=-e15aae478db831cf --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-17858077ac902bf7.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-d4f08be725787417.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-4f4df54432f3a5d3.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" "332ace5637df92ee6af20753ed8834184500b5b110e890fb96518c511268ec0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "332ace5637df92ee6af20753ed8834184500b5b110e890fb96518c511268ec0e", kill_on_drop: false }`
[INFO] [stdout] 332ace5637df92ee6af20753ed8834184500b5b110e890fb96518c511268ec0e
