[INFO] cloning repository https://github.com/terakilobyte/rustsweeper
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/terakilobyte/rustsweeper" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakilobyte%2Frustsweeper", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakilobyte%2Frustsweeper'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f027967f06e7a4319d6494fbc8311b187619660d
[INFO] testing terakilobyte/rustsweeper against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterakilobyte%2Frustsweeper" "/workspace/builds/worker-50/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-50/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/terakilobyte/rustsweeper 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 git repo https://github.com/terakilobyte/rustsweeper
[INFO] finished tweaking git repo https://github.com/terakilobyte/rustsweeper
[INFO] tweaked toml for git repo https://github.com/terakilobyte/rustsweeper written to /workspace/builds/worker-50/source/Cargo.toml
[INFO] crate git repo https://github.com/terakilobyte/rustsweeper already has a lockfile, it will not be regenerated
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded aho-corasick v0.6.9
[INFO] [stderr]   Downloaded quote v0.4.2
[INFO] [stderr]   Downloaded proc-macro2 v0.2.3
[INFO] [stderr]   Downloaded adler32 v1.0.3
[INFO] [stderr]   Downloaded atty v0.2.11
[INFO] [stderr]   Downloaded cexpr v0.2.3
[INFO] [stderr]   Downloaded clap v2.32.0
[INFO] [stderr]   Downloaded color_quant v1.0.1
[INFO] [stderr]   Downloaded memchr v1.0.2
[INFO] [stderr]   Downloaded nom v3.2.1
[INFO] [stderr]   Downloaded jpeg-decoder v0.1.15
[INFO] [stderr]   Downloaded linked-hash-map v0.5.1
[INFO] [stderr]   Downloaded inflate v0.4.4
[INFO] [stderr]   Downloaded fnv v1.0.6
[INFO] [stderr]   Downloaded rusty-xinput v1.1.0
[INFO] [stderr]   Downloaded coreaudio-sys v0.2.2
[INFO] [stderr]   Downloaded deflate v0.7.19
[INFO] [stderr]   Downloaded rand_xorshift v0.1.0
[INFO] [stderr]   Downloaded which v1.0.5
[INFO] [stderr]   Downloaded textwrap v0.10.0
[INFO] [stderr]   Downloaded clang-sys v0.21.2
[INFO] [stderr]   Downloaded lazy_static v1.2.0
[INFO] [stderr]   Downloaded redox_syscall v0.1.45
[INFO] [stderr]   Downloaded bzip2-sys v0.1.7
[INFO] [stderr]   Downloaded strsim v0.7.0
[INFO] [stderr]   Downloaded pkg-config v0.3.14
[INFO] [stderr]   Downloaded getrandom v0.2.0
[INFO] [stderr]   Downloaded rand_chacha v0.1.0
[INFO] [stderr]   Downloaded rand_core v0.6.0
[INFO] [stderr]   Downloaded memchr v2.1.2
[INFO] [stderr]   Downloaded twox-hash v1.1.2
[INFO] [stderr]   Downloaded gif v0.10.1
[INFO] [stderr]   Downloaded num-derive v0.2.3
[INFO] [stderr]   Downloaded libloading v0.4.3
[INFO] [stderr]   Downloaded env_logger v0.4.3
[INFO] [stderr]   Downloaded rand_pcg v0.1.1
[INFO] [stderr]   Downloaded bindgen v0.32.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] 2a8d4f08a221bd0d36c76f0b935ec24bda0bbed9360de9a614c59497ceea2c2e
[INFO] running `Command { std: "docker" "start" "-a" "2a8d4f08a221bd0d36c76f0b935ec24bda0bbed9360de9a614c59497ceea2c2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a8d4f08a221bd0d36c76f0b935ec24bda0bbed9360de9a614c59497ceea2c2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a8d4f08a221bd0d36c76f0b935ec24bda0bbed9360de9a614c59497ceea2c2e", kill_on_drop: false }`
[INFO] [stdout] 2a8d4f08a221bd0d36c76f0b935ec24bda0bbed9360de9a614c59497ceea2c2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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] 5de1ea2004507677d7c12eef9577683c62f57342d96a23be6d84cc474271ed57
[INFO] running `Command { std: "docker" "start" "-a" "5de1ea2004507677d7c12eef9577683c62f57342d96a23be6d84cc474271ed57", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling libm v0.2.1
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling rand_core v0.3.0
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling autocfg v0.1.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling pulldown-cmark v0.2.0
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]    Compiling num-derive v0.2.3
[INFO] [stderr]    Compiling remove_dir_all v0.5.3
[INFO] [stderr]    Compiling nix v0.15.0
[INFO] [stderr]    Compiling bytecount v0.6.2
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling xi-unicode v0.2.1
[INFO] [stderr]    Compiling mint v0.5.6
[INFO] [stderr]    Compiling uuid v0.8.1
[INFO] [stderr]    Compiling hound v3.4.0
[INFO] [stderr]    Compiling claxon v0.4.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling libloading v0.6.6
[INFO] [stderr]    Compiling walkdir v2.3.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling x11-dl v2.18.5
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stderr]    Compiling alsa-sys v0.1.2
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling draw_state v0.8.0
[INFO] [stderr]    Compiling inflate v0.4.4
[INFO] [stderr]    Compiling gif v0.10.1
[INFO] [stderr]    Compiling smallvec v0.6.13
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr] error: could not compile `syn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name syn /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-0.15.44/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --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="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=de89c6c2d7cae595 -C extra-filename=-de89c6c2d7cae595 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-084553754747af87.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-af621d124a8aa9c8.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-2f6444d33d391550.rmeta --cap-lints allow --cap-lints=warn --cfg syn_can_match_trailing_dollar --cfg syn_can_use_thread_id --cfg syn_can_use_associated_constants --cfg syn_can_call_macro_by_path --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" "5de1ea2004507677d7c12eef9577683c62f57342d96a23be6d84cc474271ed57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5de1ea2004507677d7c12eef9577683c62f57342d96a23be6d84cc474271ed57", kill_on_drop: false }`
[INFO] [stdout] 5de1ea2004507677d7c12eef9577683c62f57342d96a23be6d84cc474271ed57