[INFO] fetching crate option_set 0.1.3...
[INFO] checking option_set-0.1.3 against beta for pr-78714
[INFO] extracting crate option_set 0.1.3 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate option_set 0.1.3 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate option_set 0.1.3
[INFO] finished tweaking crates.io crate option_set 0.1.3
[INFO] tweaked toml for crates.io crate option_set 0.1.3 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "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] d251000484ebdc0d089b7ecd5b1a0e39c362766f84108f1e7ccc8a08302cfad0
[INFO] running `Command { std: "docker" "start" "-a" "d251000484ebdc0d089b7ecd5b1a0e39c362766f84108f1e7ccc8a08302cfad0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d251000484ebdc0d089b7ecd5b1a0e39c362766f84108f1e7ccc8a08302cfad0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d251000484ebdc0d089b7ecd5b1a0e39c362766f84108f1e7ccc8a08302cfad0", kill_on_drop: false }`
[INFO] [stdout] d251000484ebdc0d089b7ecd5b1a0e39c362766f84108f1e7ccc8a08302cfad0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 75d65a2a23e41ebae8ca4b0f89331ad9eae48492ed7cb04c53787594614a18d8
[INFO] running `Command { std: "docker" "start" "-a" "75d65a2a23e41ebae8ca4b0f89331ad9eae48492ed7cb04c53787594614a18d8", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking yaml-rust v0.4.4
[INFO] [stderr]     Checking serde v1.0.117
[INFO] [stderr]     Checking heck v0.3.1
[INFO] [stderr]     Checking serde_yaml v0.8.14
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking option_set v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.14s
[INFO] running `Command { std: "docker" "inspect" "75d65a2a23e41ebae8ca4b0f89331ad9eae48492ed7cb04c53787594614a18d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75d65a2a23e41ebae8ca4b0f89331ad9eae48492ed7cb04c53787594614a18d8", kill_on_drop: false }`
[INFO] [stdout] 75d65a2a23e41ebae8ca4b0f89331ad9eae48492ed7cb04c53787594614a18d8