[INFO] fetching crate mkbook 0.3.0...
[INFO] testing mkbook-0.3.0 against beta-2020-10-09 for beta-1.48-1
[INFO] extracting crate mkbook 0.3.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate mkbook 0.3.0 on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mkbook 0.3.0
[INFO] finished tweaking crates.io crate mkbook 0.3.0
[INFO] tweaked toml for crates.io crate mkbook 0.3.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate mkbook 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded typed-arena v1.7.0
[INFO] [stderr]   Downloaded sass-rs v0.2.2
[INFO] [stderr]   Downloaded entities v1.0.1
[INFO] [stderr]   Downloaded askama v0.8.0
[INFO] [stderr]   Downloaded askama_escape v0.2.0
[INFO] [stderr]   Downloaded askama_derive v0.8.0
[INFO] [stderr]   Downloaded askama_shared v0.8.0
[INFO] [stderr]   Downloaded mio-extras v2.0.5
[INFO] [stderr]   Downloaded onig_sys v69.2.0
[INFO] [stderr]   Downloaded comrak v0.6.2
[INFO] [stderr]   Downloaded colored v1.9.0
[INFO] [stderr]   Downloaded ws v0.9.1
[INFO] [stderr]   Downloaded serde_json v1.0.42
[INFO] [stderr]   Downloaded xml-rs v0.8.0
[INFO] [stderr]   Downloaded sass-sys v0.4.15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b00535235cab210b24f56ed1fbeb5e50ca97781fd1d835e741a4abfe23669727
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b00535235cab210b24f56ed1fbeb5e50ca97781fd1d835e741a4abfe23669727", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b00535235cab210b24f56ed1fbeb5e50ca97781fd1d835e741a4abfe23669727", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b00535235cab210b24f56ed1fbeb5e50ca97781fd1d835e741a4abfe23669727", kill_on_drop: false }`
[INFO] [stdout] b00535235cab210b24f56ed1fbeb5e50ca97781fd1d835e741a4abfe23669727
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6b51b8411970a0c05754798ca4563e41a0899e23487502442a3e5f10b3272112
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "6b51b8411970a0c05754798ca4563e41a0899e23487502442a3e5f10b3272112", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.8
[INFO] [stderr]    Compiling serde v1.0.103
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling bindgen v0.50.1
[INFO] [stderr]    Compiling smallvec v1.0.0
[INFO] [stderr]    Compiling askama_escape v0.2.0
[INFO] [stderr]    Compiling unchecked-index v0.2.2
[INFO] [stderr]    Compiling entities v1.0.1
[INFO] [stderr]    Compiling unicode_categories v0.1.1
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling num_cpus v1.11.1
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling inotify-sys v0.1.3
[INFO] [stderr]    Compiling bstr v0.2.8
[INFO] [stderr]    Compiling filetime v0.2.8
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling colored v1.9.0
[INFO] [stderr]    Compiling flate2 v1.0.13
[INFO] [stderr]    Compiling twoway v0.2.1
[INFO] [stderr]    Compiling inotify v0.6.1
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling unicode-normalization v0.1.11
[INFO] [stderr]    Compiling failure v0.1.6
[INFO] [stderr]    Compiling sha-1 v0.8.1
[INFO] [stderr]    Compiling sass-sys v0.4.15
[INFO] [stderr]    Compiling clang-sys v0.28.1
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling chrono v0.4.10
[INFO] [stderr]    Compiling cexpr v0.3.6
[INFO] [stderr]    Compiling idna v0.2.0
[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-1.0.8/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="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=34d312d34291b319 -C extra-filename=-34d312d34291b319 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-13aba85dfbd1ee1b.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-ab302b952e99478e.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-00e718d0d0f7c0e6.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" "6b51b8411970a0c05754798ca4563e41a0899e23487502442a3e5f10b3272112", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b51b8411970a0c05754798ca4563e41a0899e23487502442a3e5f10b3272112", kill_on_drop: false }`
[INFO] [stdout] 6b51b8411970a0c05754798ca4563e41a0899e23487502442a3e5f10b3272112
