[INFO] fetching crate purple 0.0.1-placeholder...
[INFO] checking purple-0.0.1-placeholder against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] extracting crate purple 0.0.1-placeholder into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate purple 0.0.1-placeholder on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate purple 0.0.1-placeholder
[INFO] finished tweaking crates.io crate purple 0.0.1-placeholder
[INFO] tweaked toml for crates.io crate purple 0.0.1-placeholder written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate purple 0.0.1-placeholder already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "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] ae447406e570b4243b2a0f905480bc750f48473091c5e68ea05dd745d57ba429
[INFO] running `Command { std: "docker" "start" "-a" "ae447406e570b4243b2a0f905480bc750f48473091c5e68ea05dd745d57ba429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ae447406e570b4243b2a0f905480bc750f48473091c5e68ea05dd745d57ba429", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ae447406e570b4243b2a0f905480bc750f48473091c5e68ea05dd745d57ba429", kill_on_drop: false }`
[INFO] [stdout] ae447406e570b4243b2a0f905480bc750f48473091c5e68ea05dd745d57ba429
[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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe23b57ecc62db40bdf6be9679dca398901c984ffa0f6d7626913c735bd1c92c
[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" "fe23b57ecc62db40bdf6be9679dca398901c984ffa0f6d7626913c735bd1c92c", kill_on_drop: false }`
[INFO] [stderr]     Checking purple v0.0.1-placeholder (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.50s
[INFO] running `Command { std: "docker" "inspect" "fe23b57ecc62db40bdf6be9679dca398901c984ffa0f6d7626913c735bd1c92c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe23b57ecc62db40bdf6be9679dca398901c984ffa0f6d7626913c735bd1c92c", kill_on_drop: false }`
[INFO] [stdout] fe23b57ecc62db40bdf6be9679dca398901c984ffa0f6d7626913c735bd1c92c