[INFO] fetching crate io-result-optional 0.1.2...
[INFO] checking io-result-optional-0.1.2 against try#bb9dbf1d07454a99066eabaabd5819851281494b for pr-80920
[INFO] extracting crate io-result-optional 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate io-result-optional 0.1.2 on toolchain bb9dbf1d07454a99066eabaabd5819851281494b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+bb9dbf1d07454a99066eabaabd5819851281494b" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate io-result-optional 0.1.2
[INFO] finished tweaking crates.io crate io-result-optional 0.1.2
[INFO] tweaked toml for crates.io crate io-result-optional 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+bb9dbf1d07454a99066eabaabd5819851281494b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+bb9dbf1d07454a99066eabaabd5819851281494b" "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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+bb9dbf1d07454a99066eabaabd5819851281494b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 55195de92d1c5c2a3813004490a1afad9ecd5d679e8e378ec3226171101cc5f0
[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" "55195de92d1c5c2a3813004490a1afad9ecd5d679e8e378ec3226171101cc5f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "55195de92d1c5c2a3813004490a1afad9ecd5d679e8e378ec3226171101cc5f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "55195de92d1c5c2a3813004490a1afad9ecd5d679e8e378ec3226171101cc5f0", kill_on_drop: false }`
[INFO] [stdout] 55195de92d1c5c2a3813004490a1afad9ecd5d679e8e378ec3226171101cc5f0
[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@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+bb9dbf1d07454a99066eabaabd5819851281494b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d71d2e54b9f7d4580b38e8e26b5d0abbaf3f5b9dd2b13f136b8cb3bfe07867a
[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" "0d71d2e54b9f7d4580b38e8e26b5d0abbaf3f5b9dd2b13f136b8cb3bfe07867a", kill_on_drop: false }`
[INFO] [stderr]     Checking io-result-optional v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "0d71d2e54b9f7d4580b38e8e26b5d0abbaf3f5b9dd2b13f136b8cb3bfe07867a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d71d2e54b9f7d4580b38e8e26b5d0abbaf3f5b9dd2b13f136b8cb3bfe07867a", kill_on_drop: false }`
[INFO] [stdout] 0d71d2e54b9f7d4580b38e8e26b5d0abbaf3f5b9dd2b13f136b8cb3bfe07867a