[INFO] cloning repository https://github.com/colbyn/subscript
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/colbyn/subscript" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Fsubscript", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Fsubscript'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 37960742b48bd31278fa5307412f18c5635db63a
[INFO] testing colbyn/subscript/37960742b48bd31278fa5307412f18c5635db63a against master#159ba8a92c9e2fa4121f106176309521f4af87e9+rustflags=-Copt-level=3 for pr-107051
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Fsubscript" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/colbyn/subscript on toolchain 159ba8a92c9e2fa4121f106176309521f4af87e9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+159ba8a92c9e2fa4121f106176309521f4af87e9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/colbyn/subscript
[INFO] finished tweaking git repo https://github.com/colbyn/subscript
[INFO] tweaked toml for git repo https://github.com/colbyn/subscript written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/colbyn/subscript already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+159ba8a92c9e2fa4121f106176309521f4af87e9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded hotwatch v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:7c93e6f9a94679f34221d1005849d4c83862f85b14a264fa0883942f4d043a66" "/opt/rustwide/cargo-home/bin/cargo" "+159ba8a92c9e2fa4121f106176309521f4af87e9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ede6abaeb11d7f4e7478f23764417a55a83fb2c03bda57441a8a9ab6fc7f827
[INFO] running `Command { std: "docker" "start" "-a" "8ede6abaeb11d7f4e7478f23764417a55a83fb2c03bda57441a8a9ab6fc7f827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ede6abaeb11d7f4e7478f23764417a55a83fb2c03bda57441a8a9ab6fc7f827", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ede6abaeb11d7f4e7478f23764417a55a83fb2c03bda57441a8a9ab6fc7f827", kill_on_drop: false }`
[INFO] [stdout] 8ede6abaeb11d7f4e7478f23764417a55a83fb2c03bda57441a8a9ab6fc7f827
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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 -Copt-level=3" "-e" "RUSTDOCFLAGS=--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@sha256:7c93e6f9a94679f34221d1005849d4c83862f85b14a264fa0883942f4d043a66" "/opt/rustwide/cargo-home/bin/cargo" "+159ba8a92c9e2fa4121f106176309521f4af87e9" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f523eef0c1f65df54afe9459860523cb9ef101f2a8190244dcb90c15eb24e231
[INFO] running `Command { std: "docker" "start" "-a" "f523eef0c1f65df54afe9459860523cb9ef101f2a8190244dcb90c15eb24e231", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling siphasher v0.3.3
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling const_fn v0.4.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.0
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling thread_local v1.0.1
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling phf_shared v0.8.0
[INFO] [stderr]    Compiling regex-syntax v0.6.21
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling futures-core v0.3.8
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]    Compiling same-file v1.0.6
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling walkdir v2.3.1
[INFO] [stderr]    Compiling futf v0.1.4
[INFO] [stderr]    Compiling http v0.2.1
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling utf-8 v0.7.5
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling net2 v0.2.35
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling tendril v0.4.1
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]    Compiling phf_generator v0.8.0
[INFO] [stderr]    Compiling bstr v0.2.14
[INFO] [stderr]    Compiling string_cache_codegen v0.5.1
[INFO] [stderr]    Compiling phf_codegen v0.8.0
[INFO] [stderr]    Compiling phf v0.8.0
[INFO] [stderr]    Compiling tracing-core v0.1.17
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling unic-char-range v0.9.0
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling unic-common v0.9.0
[INFO] [stderr]    Compiling once_cell v1.5.2
[INFO] [stderr]    Compiling pin-project-lite v0.1.11
[INFO] [stderr]    Compiling pin-project-lite v0.2.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling tracing v0.1.22
[INFO] [stderr]    Compiling unic-ucd-version v0.9.0
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.1
[INFO] [stderr]    Compiling parse-zoneinfo v0.3.0
[INFO] [stderr]    Compiling globset v0.4.6
[INFO] [stderr]    Compiling block-padding v0.1.5
[INFO] [stderr]    Compiling unic-char-property v0.9.0
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling inotify-sys v0.1.4
[INFO] [stderr]    Compiling alloc-no-stdlib v2.0.1
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling unicode-segmentation v1.7.0
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling unicode-width v0.1.8
[INFO] [stderr]    Compiling adler32 v1.2.0
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]    Compiling futures-sink v0.3.8
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling miniz_oxide v0.3.7
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling mio-extras v2.0.6
[INFO] [stderr]    Compiling alloc-stdlib v0.2.1
[INFO] [stderr]    Compiling inotify v0.7.1
[INFO] [stderr]    Compiling ignore v0.4.17
[INFO] [stderr]    Compiling unic-ucd-segment v0.9.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling block-buffer v0.7.3
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling filetime v0.2.13
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling deunicode v0.4.3
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling ucd-util v0.1.8
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling sha-1 v0.8.2
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling slug v0.1.4
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling notify v4.0.15
[INFO] [stderr]    Compiling globwalk v0.8.0
[INFO] [stderr]    Compiling flate2 v1.0.14
[INFO] [stderr]    Compiling unic-segment v0.9.0
[INFO] [stderr]    Compiling brotli-decompressor v2.3.1
[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-1.0.48/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --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"' --cfg 'feature="visit-mut"' -C metadata=f6ba0c40006e2bbe -C extra-filename=-f6ba0c40006e2bbe --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-89254f8a188bc205.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-0bb1ea6a23b530f1.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-ca70f4dd0d5d1ebc.rmeta --cap-lints allow --cap-lints=forbid -Copt-level=3` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "f523eef0c1f65df54afe9459860523cb9ef101f2a8190244dcb90c15eb24e231", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f523eef0c1f65df54afe9459860523cb9ef101f2a8190244dcb90c15eb24e231", kill_on_drop: false }`
[INFO] [stdout] f523eef0c1f65df54afe9459860523cb9ef101f2a8190244dcb90c15eb24e231