[INFO] fetching crate generational-indextree 1.1.2...
[INFO] checking generational-indextree-1.1.2 against master#339e19697a39a78f4d669c217b7d21109215de41 for pr-81213
[INFO] extracting crate generational-indextree 1.1.2 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate generational-indextree 1.1.2 on toolchain 339e19697a39a78f4d669c217b7d21109215de41
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+339e19697a39a78f4d669c217b7d21109215de41" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate generational-indextree 1.1.2
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate generational-indextree 1.1.2
[INFO] tweaked toml for crates.io crate generational-indextree 1.1.2 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate generational-indextree 1.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+339e19697a39a78f4d669c217b7d21109215de41" "fetch" "--locked" "--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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+339e19697a39a78f4d669c217b7d21109215de41" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9071387e50451fabbe77b01d6ef493a64d44641e6b823a93ff660fede2c3106
[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" "a9071387e50451fabbe77b01d6ef493a64d44641e6b823a93ff660fede2c3106", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9071387e50451fabbe77b01d6ef493a64d44641e6b823a93ff660fede2c3106", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9071387e50451fabbe77b01d6ef493a64d44641e6b823a93ff660fede2c3106", kill_on_drop: false }`
[INFO] [stdout] a9071387e50451fabbe77b01d6ef493a64d44641e6b823a93ff660fede2c3106
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+339e19697a39a78f4d669c217b7d21109215de41" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9878fcd7b67608cde203c6d5dc4cc24ec0070e1a6d707d00ab8c6b622b6e20f
[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" "d9878fcd7b67608cde203c6d5dc4cc24ec0070e1a6d707d00ab8c6b622b6e20f", 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] [stderr]     Checking generational-arena v0.2.8
[INFO] [stderr]     Checking generational-indextree v1.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `n1_id`
[INFO] [stdout]    --> src/arena.rs:279:9
[INFO] [stdout]     |
[INFO] [stdout] 279 |     let n1_id = arena.new_node("1");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_n1_id`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n2_id`
[INFO] [stdout]    --> src/arena.rs:280:9
[INFO] [stdout]     |
[INFO] [stdout] 280 |     let n2_id = arena.new_node("2");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_n2_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n3_id`
[INFO] [stdout]    --> src/arena.rs:281:9
[INFO] [stdout]     |
[INFO] [stdout] 281 |     let n3_id = arena.new_node("3");
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_n3_id`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> tests/lib.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` 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 1.66s
[INFO] running `Command { std: "docker" "inspect" "d9878fcd7b67608cde203c6d5dc4cc24ec0070e1a6d707d00ab8c6b622b6e20f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9878fcd7b67608cde203c6d5dc4cc24ec0070e1a6d707d00ab8c6b622b6e20f", kill_on_drop: false }`
[INFO] [stdout] d9878fcd7b67608cde203c6d5dc4cc24ec0070e1a6d707d00ab8c6b622b6e20f