[INFO] fetching crate buttons 0.2.0...
[INFO] checking buttons-0.2.0 against master#c724b67e1b474262917a5154d74e7072267593fe for pr-74315
[INFO] extracting crate buttons 0.2.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate buttons 0.2.0 on toolchain c724b67e1b474262917a5154d74e7072267593fe
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buttons 0.2.0
[INFO] finished tweaking crates.io crate buttons 0.2.0
[INFO] tweaked toml for crates.io crate buttons 0.2.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "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] f798a2dc5135def93f0bdb244b7341223be8f37f2d3c5d1116fc1a494889a486
[INFO] running `Command { std: "docker" "start" "-a" "f798a2dc5135def93f0bdb244b7341223be8f37f2d3c5d1116fc1a494889a486", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f798a2dc5135def93f0bdb244b7341223be8f37f2d3c5d1116fc1a494889a486", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f798a2dc5135def93f0bdb244b7341223be8f37f2d3c5d1116fc1a494889a486", kill_on_drop: false }`
[INFO] [stdout] f798a2dc5135def93f0bdb244b7341223be8f37f2d3c5d1116fc1a494889a486
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6016a207909b9f37f5e18b973f6109e52ae7a77a1ecb9a7880c0fde81d6e872a
[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" "6016a207909b9f37f5e18b973f6109e52ae7a77a1ecb9a7880c0fde81d6e872a", kill_on_drop: false }`
[INFO] [stderr]     Checking buttons v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `Command { std: "docker" "inspect" "6016a207909b9f37f5e18b973f6109e52ae7a77a1ecb9a7880c0fde81d6e872a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6016a207909b9f37f5e18b973f6109e52ae7a77a1ecb9a7880c0fde81d6e872a", kill_on_drop: false }`
[INFO] [stdout] 6016a207909b9f37f5e18b973f6109e52ae7a77a1ecb9a7880c0fde81d6e872a