[INFO] cloning repository https://github.com/zyansheep/Dither
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zyansheep/Dither" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzyansheep%2FDither", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzyansheep%2FDither'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d7410ef064197612d416f55492d5d56dca808404
[INFO] checking zyansheep/Dither against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzyansheep%2FDither" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zyansheep/Dither on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zyansheep/Dither
[INFO] finished tweaking git repo https://github.com/zyansheep/Dither
[INFO] tweaked toml for git repo https://github.com/zyansheep/Dither written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/zyansheep/Dither already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c7eca630dfee849fc10520eed5a5141e19baae44a5e8d90e529adacb7e3b7619
[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" "c7eca630dfee849fc10520eed5a5141e19baae44a5e8d90e529adacb7e3b7619", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c7eca630dfee849fc10520eed5a5141e19baae44a5e8d90e529adacb7e3b7619", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c7eca630dfee849fc10520eed5a5141e19baae44a5e8d90e529adacb7e3b7619", kill_on_drop: false }`
[INFO] [stdout] c7eca630dfee849fc10520eed5a5141e19baae44a5e8d90e529adacb7e3b7619
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 609408e3747e08ecca3d14284e20b4aa55fbbd3620177138b801d4ffe40f231e
[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" "609408e3747e08ecca3d14284e20b4aa55fbbd3620177138b801d4ffe40f231e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling syn v1.0.45
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]     Checking futures-core v0.3.6
[INFO] [stderr]     Checking futures-sink v0.3.6
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking futures-io v0.3.6
[INFO] [stderr]     Checking subtle v2.3.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling bytes v0.5.6
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]     Checking block-padding v0.2.1
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking cpuid-bool v0.1.2
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking arrayref v0.3.6
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]    Compiling xml-rs v0.8.3
[INFO] [stderr]     Checking constant_time_eq v0.1.5
[INFO] [stderr]     Checking subtle v1.0.0
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking unsigned-varint v0.5.1
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking futures-timer v3.0.2
[INFO] [stderr]     Checking pin-project-lite v0.1.11
[INFO] [stderr]    Compiling crc32fast v1.2.0
[INFO] [stderr]     Checking rustc-hash v1.1.0
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]     Checking xi-unicode v0.2.1
[INFO] [stderr]     Checking base64 v0.11.0
[INFO] [stderr]    Compiling nix v0.18.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]     Checking atom v0.3.6
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking iced_core v0.2.1
[INFO] [stderr]     Checking xdg v2.2.0
[INFO] [stderr]     Checking copyless v0.1.5
[INFO] [stderr]    Compiling glam v0.8.7
[INFO] [stderr]     Checking svg_fmt v0.2.1
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking maplit v1.0.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking futures-task v0.3.6
[INFO] [stderr]    Compiling ring v0.16.15
[INFO] [stderr]    Compiling cmake v0.1.44
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking instant v0.1.7
[INFO] [stderr]     Checking libloading v0.6.4
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking lock_api v0.4.1
[INFO] [stderr]     Checking futures-channel v0.3.6
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]     Checking blake2b_simd v0.5.10
[INFO] [stderr]     Checking blake2s_simd v0.5.10
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]     Checking quicksink v0.1.2
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling wayland-sys v0.27.0
[INFO] [stderr]    Compiling libz-sys v1.1.2
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]    Compiling servo-fontconfig-sys v4.0.9
[INFO] [stderr]    Compiling x11-dl v2.18.5
[INFO] [stderr]    Compiling ncurses v5.99.0
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking hibitset v0.6.3
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]    Compiling anyhow v1.0.33
[INFO] [stderr]     Checking iced_style v0.1.0
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking dlib v0.4.2
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling servo-freetype-sys v4.0.5
[INFO] [stderr]    Compiling expat-sys v2.1.6
[INFO] [stderr]     Checking stb_truetype v0.3.1
[INFO] [stderr]     Checking dns-parser v0.8.0
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking aho-corasick v0.7.14
[INFO] [stderr]     Checking relevant v0.4.2
[INFO] [stderr]     Checking wayland-sys v0.23.6
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]    Compiling wayland-scanner v0.27.0
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling snow v0.7.2
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking regex v1.4.1
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling wayland-scanner v0.23.6
[INFO] [stderr]    Compiling petgraph v0.5.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking parking_lot_core v0.8.0
[INFO] [stderr]     Checking raw-window-handle v0.3.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking nix v0.17.0
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking flate2 v1.0.18
[INFO] [stderr]     Checking get_if_addrs v0.5.3
[INFO] [stderr]     Checking socket2 v0.3.15
[INFO] [stderr]     Checking shared_library v0.1.9
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking freetype v0.4.1
[INFO] [stderr]     Checking term_size v0.3.2
[INFO] [stderr]     Checking ordered-float v1.1.0
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking euclid v0.20.14
[INFO] [stderr]     Checking line_drawing v0.7.0
[INFO] [stderr]     Checking num-complex v0.3.0
[INFO] [stderr]     Checking servo-fontconfig v0.4.0
[INFO] [stderr]    Compiling which v3.1.1
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking block-cipher v0.8.0
[INFO] [stderr]     Checking universal-hash v0.4.0
[INFO] [stderr]     Checking aead v0.3.2
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking gfx-hal v0.4.1
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]    Compiling xcb v0.9.0
[INFO] [stderr]     Checking parking_lot v0.11.0
[INFO] [stderr]     Checking xcursor v0.3.2
[INFO] [stderr]     Checking ash v0.29.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling wayland-client v0.27.0
[INFO] [stderr]    Compiling wayland-protocols v0.27.0
[INFO] [stderr]     Checking webpki v0.21.3
[INFO] [stderr]     Checking sct v0.6.0
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking hmac v0.7.1
[INFO] [stderr]    Compiling const-random-macro v0.1.11
[INFO] [stderr]     Checking rusttype v0.8.3
[INFO] [stderr]    Compiling prost-build v0.6.1
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking rand_chacha v0.2.2
[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,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="extra-traits"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' --cfg 'feature="visit"' -C metadata=dfb13c9dc7134ff6 -C extra-filename=-dfb13c9dc7134ff6 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-ab33b97f38e6e831.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-476d26c939207289.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-e62bdf8dd5704851.rmeta --cap-lints allow --cap-lints=forbid --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` (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" "609408e3747e08ecca3d14284e20b4aa55fbbd3620177138b801d4ffe40f231e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "609408e3747e08ecca3d14284e20b4aa55fbbd3620177138b801d4ffe40f231e", kill_on_drop: false }`
[INFO] [stdout] 609408e3747e08ecca3d14284e20b4aa55fbbd3620177138b801d4ffe40f231e