[INFO] fetching crate lights-out 0.1.0...
[INFO] checking lights-out-0.1.0 against master#893fadd11a52aa26fc19c67ee1b79f03d6a1bed3 for pr-77153
[INFO] extracting crate lights-out 0.1.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate lights-out 0.1.0 on toolchain 893fadd11a52aa26fc19c67ee1b79f03d6a1bed3
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+893fadd11a52aa26fc19c67ee1b79f03d6a1bed3" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lights-out 0.1.0
[INFO] finished tweaking crates.io crate lights-out 0.1.0
[INFO] tweaked toml for crates.io crate lights-out 0.1.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+893fadd11a52aa26fc19c67ee1b79f03d6a1bed3" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+893fadd11a52aa26fc19c67ee1b79f03d6a1bed3" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+893fadd11a52aa26fc19c67ee1b79f03d6a1bed3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63787df09e1b22596d734212ffff5c0b410f62507d8272e0d7c472a667832527
[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" "63787df09e1b22596d734212ffff5c0b410f62507d8272e0d7c472a667832527", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63787df09e1b22596d734212ffff5c0b410f62507d8272e0d7c472a667832527", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63787df09e1b22596d734212ffff5c0b410f62507d8272e0d7c472a667832527", kill_on_drop: false }`
[INFO] [stdout] 63787df09e1b22596d734212ffff5c0b410f62507d8272e0d7c472a667832527
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+893fadd11a52aa26fc19c67ee1b79f03d6a1bed3" "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] 503dbc006cc839aaff96d876537707db244ea23d8b38f05f31dc70eafae535fe
[INFO] running `Command { std: "docker" "start" "-a" "503dbc006cc839aaff96d876537707db244ea23d8b38f05f31dc70eafae535fe", kill_on_drop: false }`
[INFO] [stderr]     Checking lights-out v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/solvers/state2.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn new(sx: usize, sy: usize) -> StructLevel {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `solve`
[INFO] [stdout]   --> src/solvers/state2.rs:89:8
[INFO] [stdout]    |
[INFO] [stdout] 89 | pub fn solve(level: &StructLevel) -> Option<Vec<(usize, usize)>> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gauss_jordan_zf2`
[INFO] [stdout]    --> src/solvers/state2.rs:125:4
[INFO] [stdout]     |
[INFO] [stdout] 125 | fn gauss_jordan_zf2(mat: Vec<Vec<usize>>, expected: Vec<usize>) -> Option<Vec<usize>> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `Command { std: "docker" "inspect" "503dbc006cc839aaff96d876537707db244ea23d8b38f05f31dc70eafae535fe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "503dbc006cc839aaff96d876537707db244ea23d8b38f05f31dc70eafae535fe", kill_on_drop: false }`
[INFO] [stdout] 503dbc006cc839aaff96d876537707db244ea23d8b38f05f31dc70eafae535fe