[INFO] fetching crate arc-rs 0.0.1...
[INFO] testing arc-rs-0.0.1 against beta-2021-01-01 for beta-1.50-1
[INFO] extracting crate arc-rs 0.0.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate arc-rs 0.0.1 on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arc-rs 0.0.1
[INFO] finished tweaking crates.io crate arc-rs 0.0.1
[INFO] tweaked toml for crates.io crate arc-rs 0.0.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded arc_ast v0.0.1
[INFO] [stderr]   Downloaded arc_number v0.0.1
[INFO] [stderr]   Downloaded arc_parser v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb4ab704c2a65ffddeb98f6e3ecd91743bc4ed65f12e534b9850f7b8a68baaae
[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" "eb4ab704c2a65ffddeb98f6e3ecd91743bc4ed65f12e534b9850f7b8a68baaae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb4ab704c2a65ffddeb98f6e3ecd91743bc4ed65f12e534b9850f7b8a68baaae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb4ab704c2a65ffddeb98f6e3ecd91743bc4ed65f12e534b9850f7b8a68baaae", kill_on_drop: false }`
[INFO] [stdout] eb4ab704c2a65ffddeb98f6e3ecd91743bc4ed65f12e534b9850f7b8a68baaae
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4844ebe19bd992e17c008fd870c06205b2fba9187afb80339a8f1c13c74c9297
[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" "4844ebe19bd992e17c008fd870c06205b2fba9187afb80339a8f1c13c74c9297", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling arc_parser v0.1.0
[INFO] [stderr]    Compiling num v0.2.1
[INFO] [stderr]    Compiling arc_number v0.0.1
[INFO] [stderr]    Compiling arc_ast v0.0.1
[INFO] [stderr]    Compiling arc-rs v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.91s
[INFO] running `Command { std: "docker" "inspect" "4844ebe19bd992e17c008fd870c06205b2fba9187afb80339a8f1c13c74c9297", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4844ebe19bd992e17c008fd870c06205b2fba9187afb80339a8f1c13c74c9297", kill_on_drop: false }`
[INFO] [stdout] 4844ebe19bd992e17c008fd870c06205b2fba9187afb80339a8f1c13c74c9297
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e0f8baede75b4840cfb3b894f766cdc98898351764a0a445fb1d700513aa0cbd
[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" "e0f8baede75b4840cfb3b894f766cdc98898351764a0a445fb1d700513aa0cbd", kill_on_drop: false }`
[INFO] [stderr]    Compiling arc-rs v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error: could not compile `arc-rs`
[INFO] [stdout] error[E0463]: can't find crate for `arc`
[INFO] [stdout]  --> tests/to_html.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | extern crate arc;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "e0f8baede75b4840cfb3b894f766cdc98898351764a0a445fb1d700513aa0cbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0f8baede75b4840cfb3b894f766cdc98898351764a0a445fb1d700513aa0cbd", kill_on_drop: false }`
[INFO] [stdout] e0f8baede75b4840cfb3b894f766cdc98898351764a0a445fb1d700513aa0cbd