[INFO] fetching crate simple-menu 0.1.0...
[INFO] documenting simple-menu-0.1.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate simple-menu 0.1.0 into /workspace/builds/worker-29/source
[INFO] validating manifest of crates.io crate simple-menu 0.1.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple-menu 0.1.0
[INFO] finished tweaking crates.io crate simple-menu 0.1.0
[INFO] tweaked toml for crates.io crate simple-menu 0.1.0 written to /workspace/builds/worker-29/source/Cargo.toml
[INFO] crate crates.io crate simple-menu 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f147cc47f5c7732ed67e5b985ccf8709e7bba6124e8deb2dd7897da48f70c8e5
[INFO] running `Command { std: "docker" "start" "-a" "f147cc47f5c7732ed67e5b985ccf8709e7bba6124e8deb2dd7897da48f70c8e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f147cc47f5c7732ed67e5b985ccf8709e7bba6124e8deb2dd7897da48f70c8e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f147cc47f5c7732ed67e5b985ccf8709e7bba6124e8deb2dd7897da48f70c8e5", kill_on_drop: false }`
[INFO] [stdout] f147cc47f5c7732ed67e5b985ccf8709e7bba6124e8deb2dd7897da48f70c8e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-29/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 913169eb1edbb62efa206b9b1d921bc96b697ff3bb805a21aaa4025a6b9a5377
[INFO] running `Command { std: "docker" "start" "-a" "913169eb1edbb62efa206b9b1d921bc96b697ff3bb805a21aaa4025a6b9a5377", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.47
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling serde v1.0.102
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]    Compiling ui-sys v0.1.3
[INFO] [stderr]     Checking backtrace v0.3.40
[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-1.0.8/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="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=e0b9f87452b5b120 -C extra-filename=-e0b9f87452b5b120 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-75b011eb709d6709.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-a4a804bef2b7a2b7.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-e5d6ef4cd3d3c00f.rmeta --cap-lints allow --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" "913169eb1edbb62efa206b9b1d921bc96b697ff3bb805a21aaa4025a6b9a5377", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "913169eb1edbb62efa206b9b1d921bc96b697ff3bb805a21aaa4025a6b9a5377", kill_on_drop: false }`
[INFO] [stdout] 913169eb1edbb62efa206b9b1d921bc96b697ff3bb805a21aaa4025a6b9a5377
