[INFO] fetching crate alter 0.1.0...
[INFO] checking alter-0.1.0 against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] extracting crate alter 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate alter 0.1.0 on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate alter 0.1.0
[INFO] finished tweaking crates.io crate alter 0.1.0
[INFO] tweaked toml for crates.io crate alter 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate alter 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "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] 4b0b0107071a3ddb480e81f7350027f0fdca4e85531b9993d41015d2f1f5bf6a
[INFO] running `Command { std: "docker" "start" "-a" "4b0b0107071a3ddb480e81f7350027f0fdca4e85531b9993d41015d2f1f5bf6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b0b0107071a3ddb480e81f7350027f0fdca4e85531b9993d41015d2f1f5bf6a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b0b0107071a3ddb480e81f7350027f0fdca4e85531b9993d41015d2f1f5bf6a", kill_on_drop: false }`
[INFO] [stdout] 4b0b0107071a3ddb480e81f7350027f0fdca4e85531b9993d41015d2f1f5bf6a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 633998a707462d48a90407d844e4b6b71b5d2037331fbe5d1a5af42f2c80a91d
[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" "633998a707462d48a90407d844e4b6b71b5d2037331fbe5d1a5af42f2c80a91d", kill_on_drop: false }`
[INFO] [stderr]     Checking alter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "633998a707462d48a90407d844e4b6b71b5d2037331fbe5d1a5af42f2c80a91d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "633998a707462d48a90407d844e4b6b71b5d2037331fbe5d1a5af42f2c80a91d", kill_on_drop: false }`
[INFO] [stdout] 633998a707462d48a90407d844e4b6b71b5d2037331fbe5d1a5af42f2c80a91d