[INFO] cloning repository https://github.com/servo/servo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/servo/servo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fservo%2Fservo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fservo%2Fservo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 50f8e664ef8626c0e139967711dcb70fef189af6
[INFO] checking servo/servo against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fservo%2Fservo" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/servo/servo on toolchain 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config
[INFO] removed /workspace/builds/worker-0/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/servo/servo
[INFO] finished tweaking git repo https://github.com/servo/servo
[INFO] tweaked toml for git repo https://github.com/servo/servo written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/servo/servo already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f82fb14f1c1fde94210a770fbb5f12121a3bcd74768ba1497bd9132f9b364d1f
[INFO] running `Command { std: "docker" "start" "-a" "f82fb14f1c1fde94210a770fbb5f12121a3bcd74768ba1497bd9132f9b364d1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f82fb14f1c1fde94210a770fbb5f12121a3bcd74768ba1497bd9132f9b364d1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f82fb14f1c1fde94210a770fbb5f12121a3bcd74768ba1497bd9132f9b364d1f", kill_on_drop: false }`
[INFO] [stdout] f82fb14f1c1fde94210a770fbb5f12121a3bcd74768ba1497bd9132f9b364d1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93fc55717a7da13136e23cf59bc5024771df4d8b308f20fe930c833eb9406586
[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" "93fc55717a7da13136e23cf59bc5024771df4d8b308f20fe930c833eb9406586", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.87
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]    Compiling strsim v0.9.3
[INFO] [stderr]    Compiling ident_case v1.0.0
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]     Checking nodrop v0.1.12
[INFO] [stderr]    Compiling httparse v1.3.6
[INFO] [stderr]     Checking opaque-debug v0.2.1
[INFO] [stderr]     Checking base64 v0.12.0
[INFO] [stderr]     Checking adler v0.2.3
[INFO] [stderr]     Checking smallbitvec v2.5.0
[INFO] [stderr]     Checking object v0.22.0
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]     Checking getopts v0.2.17
[INFO] [stderr]    Compiling const_fn v0.4.3
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking color_quant v1.0.1
[INFO] [stderr]    Compiling libloading v0.6.1
[INFO] [stderr]     Checking bytemuck v1.4.1
[INFO] [stderr]    Compiling cfg_aliases v0.1.0
[INFO] [stderr]     Checking atomic_refcell v0.1.7
[INFO] [stderr]    Compiling fs_extra v1.1.0
[INFO] [stderr]     Checking signpost v0.1.0 (https://github.com/pcwalton/signpost.git#7ed71250)
[INFO] [stderr]     Checking servo-media-traits v0.1.0 (https://github.com/servo/media#b23e7228)
[INFO] [stderr]     Checking byte-slice-cast v0.2.0
[INFO] [stderr]     Checking speexdsp-resampler v0.1.0
[INFO] [stderr]     Checking inplace_it v0.3.2
[INFO] [stderr]     Checking copyless v0.1.4
[INFO] [stderr]     Checking urlencoding v1.1.1
[INFO] [stderr]    Compiling glob v0.3.0
[INFO] [stderr]     Checking once_cell v1.6.0
[INFO] [stderr]    Compiling humantime v2.0.1
[INFO] [stderr]    Compiling termcolor v1.1.0
[INFO] [stderr]    Compiling bindgen v0.58.1
[INFO] [stderr]    Compiling shlex v1.0.0
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]     Checking xi-unicode v0.1.0
[INFO] [stderr]     Checking ucd v0.1.1
[INFO] [stderr]     Checking unicode-script v0.5.2
[INFO] [stderr]    Compiling peeking_take_while v0.1.2
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling winit v0.24.0 (https://github.com/rust-windowing/winit.git?rev=4192d04a53202c199f94d1b7d883a34c9ad09272#4192d04a)
[INFO] [stderr]     Checking futures-sink v0.3.13
[INFO] [stderr]     Checking futures-task v0.3.13
[INFO] [stderr]     Checking futures-io v0.3.13
[INFO] [stderr]    Compiling encoding_c v0.9.7
[INFO] [stderr]    Compiling encoding_c_mem v0.2.6
[INFO] [stderr]    Compiling gimli v0.23.0
[INFO] [stderr]    Compiling openssl v0.10.33
[INFO] [stderr]     Checking surfman-chains-api v0.2.0
[INFO] [stderr]     Checking mitochondria v1.1.2
[INFO] [stderr]     Checking unicode-xid v0.2.1
[INFO] [stderr]    Compiling procedural-masquerade v0.1.7
[INFO] [stderr]     Checking binary-space-partition v0.1.2
[INFO] [stderr]    Compiling script_plugins v0.0.1 (/opt/rustwide/workdir/components/script_plugins)
[INFO] [stderr]     Checking svg_fmt v0.4.0
[INFO] [stderr]     Checking sw-composite v0.7.14
[INFO] [stderr]     Checking tracy-rs v0.1.2
[INFO] [stdout] error[E0463]: can't find crate for `rustc_ast`
[INFO] [stdout]   --> components/script_plugins/lib.rs:22:1
[INFO] [stdout]    |
[INFO] [stdout] 22 | extern crate rustc_ast;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `script_plugins`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "93fc55717a7da13136e23cf59bc5024771df4d8b308f20fe930c833eb9406586", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93fc55717a7da13136e23cf59bc5024771df4d8b308f20fe930c833eb9406586", kill_on_drop: false }`
[INFO] [stdout] 93fc55717a7da13136e23cf59bc5024771df4d8b308f20fe930c833eb9406586