[INFO] cloning repository https://github.com/alex-bezverkhniy/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/alex-bezverkhniy/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-bezverkhniy%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-bezverkhniy%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 21ca27bac7ab2b36d8001dabccc88b7b2b4ecec1
[INFO] checking alex-bezverkhniy/rust-playground against try#8de4b308b608cded0ebccf658a0fc719bce87d4e for pr-89056
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Falex-bezverkhniy%2Frust-playground" "/workspace/builds/worker-77/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-77/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alex-bezverkhniy/rust-playground on toolchain 8de4b308b608cded0ebccf658a0fc719bce87d4e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/alex-bezverkhniy/rust-playground
[INFO] finished tweaking git repo https://github.com/alex-bezverkhniy/rust-playground
[INFO] tweaked toml for git repo https://github.com/alex-bezverkhniy/rust-playground written to /workspace/builds/worker-77/source/Cargo.toml
[INFO] crate git repo https://github.com/alex-bezverkhniy/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f38987b96258f17687c9bdf1f2aff2912746bb24a16b1e3cf54c773c3308d5af
[INFO] running `Command { std: "docker" "start" "-a" "f38987b96258f17687c9bdf1f2aff2912746bb24a16b1e3cf54c773c3308d5af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f38987b96258f17687c9bdf1f2aff2912746bb24a16b1e3cf54c773c3308d5af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f38987b96258f17687c9bdf1f2aff2912746bb24a16b1e3cf54c773c3308d5af", kill_on_drop: false }`
[INFO] [stdout] f38987b96258f17687c9bdf1f2aff2912746bb24a16b1e3cf54c773c3308d5af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-77/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+8de4b308b608cded0ebccf658a0fc719bce87d4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 804949b4908cb6f99a616cddb1112554d32ed5fbc185980db9f29f466ffdc997
[INFO] running `Command { std: "docker" "start" "-a" "804949b4908cb6f99a616cddb1112554d32ed5fbc185980db9f29f466ffdc997", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `safe_division`
[INFO] [stdout]  --> src/option_demo.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn safe_division(dividen: u32, division: u32) -> Option<u32> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `Command { std: "docker" "inspect" "804949b4908cb6f99a616cddb1112554d32ed5fbc185980db9f29f466ffdc997", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "804949b4908cb6f99a616cddb1112554d32ed5fbc185980db9f29f466ffdc997", kill_on_drop: false }`
[INFO] [stdout] 804949b4908cb6f99a616cddb1112554d32ed5fbc185980db9f29f466ffdc997