[INFO] fetching crate lab_grader 0.11.0...
[INFO] checking lab_grader-0.11.0 against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] extracting crate lab_grader 0.11.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate lab_grader 0.11.0 on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lab_grader 0.11.0
[INFO] finished tweaking crates.io crate lab_grader 0.11.0
[INFO] tweaked toml for crates.io crate lab_grader 0.11.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate crates.io crate lab_grader 0.11.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded universal-hash v0.3.0
[INFO] [stderr]   Downloaded aead v0.2.0
[INFO] [stderr]   Downloaded adler32 v1.1.0
[INFO] [stderr]   Downloaded backtrace v0.3.49
[INFO] [stderr]   Downloaded wasm-bindgen-futures v0.4.14
[INFO] [stderr]   Downloaded aes-gcm v0.5.0
[INFO] [stderr]   Downloaded hkdf v0.8.0
[INFO] [stderr]   Downloaded generator v0.6.21
[INFO] [stderr]   Downloaded loom v0.3.4
[INFO] [stderr]   Downloaded rocket v0.4.5
[INFO] [stderr]   Downloaded pear_codegen v0.1.4
[INFO] [stderr]   Downloaded addr2line v0.12.2
[INFO] [stderr]   Downloaded rocket_contrib v0.4.5
[INFO] [stderr]   Downloaded rocket_http v0.4.5
[INFO] [stderr]   Downloaded cookie v0.11.3
[INFO] [stderr]   Downloaded pear v0.1.4
[INFO] [stderr]   Downloaded bytes v0.5.5
[INFO] [stderr]   Downloaded reqwest v0.10.6
[INFO] [stderr]   Downloaded rocket_codegen v0.4.5
[INFO] [stderr]   Downloaded notify v4.0.15
[INFO] [stderr]   Downloaded polyval v0.3.3
[INFO] [stderr]   Downloaded ghash v0.2.3
[INFO] [stderr]   Downloaded serde_yaml v0.8.13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4305b4b7e54a810b2f863e376598adc7524c131db0a4685c4d5a92dd4b80c36b
[INFO] running `Command { std: "docker" "start" "-a" "4305b4b7e54a810b2f863e376598adc7524c131db0a4685c4d5a92dd4b80c36b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4305b4b7e54a810b2f863e376598adc7524c131db0a4685c4d5a92dd4b80c36b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4305b4b7e54a810b2f863e376598adc7524c131db0a4685c4d5a92dd4b80c36b", kill_on_drop: false }`
[INFO] [stdout] 4305b4b7e54a810b2f863e376598adc7524c131db0a4685c4d5a92dd4b80c36b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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=forbid" "-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" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f279c137b3836addff977f384aa08afd906828b0280bca4cb83fd38f3dd99ef3
[INFO] running `Command { std: "docker" "start" "-a" "f279c137b3836addff977f384aa08afd906828b0280bca4cb83fd38f3dd99ef3", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling yansi v0.5.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking tinyvec v0.3.3
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling pkg-config v0.3.17
[INFO] [stderr]    Compiling cc v1.0.56
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking bytes v0.5.5
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling subtle v1.0.0
[INFO] [stderr]     Checking pin-project-lite v0.1.7
[INFO] [stderr]    Compiling ppv-lite86 v0.2.8
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking foreign-types-shared v0.1.1
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling zeroize v1.1.0
[INFO] [stderr]    Compiling safemem v0.3.3
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]     Checking futures-io v0.3.5
[INFO] [stderr]    Compiling base64 v0.12.3
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]     Checking openssl-probe v0.1.2
[INFO] [stderr]    Compiling smallvec v1.4.0
[INFO] [stderr]     Checking try-lock v0.2.2
[INFO] [stderr]    Compiling state v0.4.1
[INFO] [stderr]    Compiling serde_json v1.0.56
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]     Checking gimli v0.21.0
[INFO] [stderr]     Checking adler32 v1.1.0
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking lazycell v1.2.1
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]     Checking unicode-xid v0.1.0
[INFO] [stderr]    Compiling encoding_rs v0.8.23
[INFO] [stderr]     Checking linked-hash-map v0.5.3
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking object v0.20.0
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking encode_unicode v0.3.6
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking foreign-types v0.3.2
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]     Checking unicode-normalization v0.1.13
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking yaml-rust v0.4.4
[INFO] [stderr]    Compiling pear_codegen v0.1.4
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling rocket_codegen v0.4.5
[INFO] [stderr]    Compiling rocket v0.4.5
[INFO] [stderr]    Compiling indexmap v1.4.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr] error: could not compile `regex-syntax`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name regex_syntax /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.18/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' -C metadata=3dc172dffd82d0da -C extra-filename=-3dc172dffd82d0da --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid` (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" "f279c137b3836addff977f384aa08afd906828b0280bca4cb83fd38f3dd99ef3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f279c137b3836addff977f384aa08afd906828b0280bca4cb83fd38f3dd99ef3", kill_on_drop: false }`
[INFO] [stdout] f279c137b3836addff977f384aa08afd906828b0280bca4cb83fd38f3dd99ef3