[INFO] fetching crate polonius-engine 0.12.1...
[INFO] checking polonius-engine-0.12.1 against master#f82664191d0e8764b7435b9d72eb0e366b8b1464 for pr-83354
[INFO] extracting crate polonius-engine 0.12.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate polonius-engine 0.12.1 on toolchain f82664191d0e8764b7435b9d72eb0e366b8b1464
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate polonius-engine 0.12.1
[INFO] finished tweaking crates.io crate polonius-engine 0.12.1
[INFO] tweaked toml for crates.io crate polonius-engine 0.12.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 61cfe6292ea1e7b41156cc803cfe7d643e2ba8e9ecfba20b092438614e686195
[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" "61cfe6292ea1e7b41156cc803cfe7d643e2ba8e9ecfba20b092438614e686195", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61cfe6292ea1e7b41156cc803cfe7d643e2ba8e9ecfba20b092438614e686195", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61cfe6292ea1e7b41156cc803cfe7d643e2ba8e9ecfba20b092438614e686195", kill_on_drop: false }`
[INFO] [stdout] 61cfe6292ea1e7b41156cc803cfe7d643e2ba8e9ecfba20b092438614e686195
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+f82664191d0e8764b7435b9d72eb0e366b8b1464" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eca9a68774713a049c23b74d6a1a5eefb425ceed2232f041a400eb0b6c57e1d6
[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" "eca9a68774713a049c23b74d6a1a5eefb425ceed2232f041a400eb0b6c57e1d6", kill_on_drop: false }`
[INFO] [stderr]     Checking datafrog v2.0.1
[INFO] [stderr]     Checking polonius-engine v0.12.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `potential_errors`
[INFO] [stdout]    --> src/output/mod.rs:139:5
[INFO] [stdout]     |
[INFO] [stdout] 139 |     potential_errors: Option<FxHashSet<T::Loan>>,
[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] [stdout] warning: field is never read: `potential_errors`
[INFO] [stdout]    --> src/output/mod.rs:139:5
[INFO] [stdout]     |
[INFO] [stdout] 139 |     potential_errors: Option<FxHashSet<T::Loan>>,
[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 2.07s
[INFO] running `Command { std: "docker" "inspect" "eca9a68774713a049c23b74d6a1a5eefb425ceed2232f041a400eb0b6c57e1d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eca9a68774713a049c23b74d6a1a5eefb425ceed2232f041a400eb0b6c57e1d6", kill_on_drop: false }`
[INFO] [stdout] eca9a68774713a049c23b74d6a1a5eefb425ceed2232f041a400eb0b6c57e1d6