[INFO] fetching crate struckdown 0.1.0...
[INFO] testing struckdown-0.1.0 against 1.55.0 for beta-1.56-2
[INFO] extracting crate struckdown 0.1.0 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate struckdown 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 struckdown 0.1.0
[INFO] finished tweaking crates.io crate struckdown 0.1.0
[INFO] tweaked toml for crates.io crate struckdown 0.1.0 written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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" "+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-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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] 13cda083bd8303536441a196744058d5f410043c6b802fb0839f7c35c0902b5b
[INFO] running `Command { std: "docker" "start" "-a" "13cda083bd8303536441a196744058d5f410043c6b802fb0839f7c35c0902b5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13cda083bd8303536441a196744058d5f410043c6b802fb0839f7c35c0902b5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13cda083bd8303536441a196744058d5f410043c6b802fb0839f7c35c0902b5b", kill_on_drop: false }`
[INFO] [stdout] 13cda083bd8303536441a196744058d5f410043c6b802fb0839f7c35c0902b5b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 222ed239b13ac31d27ec4642192c3e7e04a7d1a7b4c47eac86e7d6ca554bf3dd
[INFO] running `Command { std: "docker" "start" "-a" "222ed239b13ac31d27ec4642192c3e7e04a7d1a7b4c47eac86e7d6ca554bf3dd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling siphasher v0.3.7
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling new_debug_unreachable v1.0.4
[INFO] [stderr]    Compiling mac v0.1.1
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling utf-8 v0.7.6
[INFO] [stderr]    Compiling precomputed-hash v0.1.1
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling cc v1.0.70
[INFO] [stderr]    Compiling bytes v0.6.0
[INFO] [stderr]    Compiling matches v0.1.9
[INFO] [stderr]    Compiling v_escape v0.14.1
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling safemem v0.3.3
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling unicode-bidi v0.3.6
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling xml-rs v0.8.4
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling pulldown-cmark v0.8.0
[INFO] [stderr]    Compiling v_htmlescape v0.11.0
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling deunicode v0.4.3
[INFO] [stderr]    Compiling slab v0.4.4
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling dtoa v0.4.8
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling tinyvec v1.4.0
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling tokio v0.3.7
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling slug v0.1.4
[INFO] [stderr]    Compiling form_urlencoded v1.0.1
[INFO] [stderr]    Compiling line-wrap v0.1.1
[INFO] [stderr]    Compiling getopts v0.2.21
[INFO] [stderr]    Compiling buf-min v0.2.0
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling futf v0.1.4
[INFO] [stderr] error: could not compile `itertools`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name itertools --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/itertools-0.9.0/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="default"' --cfg 'feature="use_std"' -C metadata=90d213abf8934f91 -C extra-filename=-90d213abf8934f91 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern either=/opt/rustwide/target/debug/deps/libeither-86164c251fc3f461.rmeta --cap-lints allow --cap-lints=warn` (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" "222ed239b13ac31d27ec4642192c3e7e04a7d1a7b4c47eac86e7d6ca554bf3dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "222ed239b13ac31d27ec4642192c3e7e04a7d1a7b4c47eac86e7d6ca554bf3dd", kill_on_drop: false }`
[INFO] [stdout] 222ed239b13ac31d27ec4642192c3e7e04a7d1a7b4c47eac86e7d6ca554bf3dd