[INFO] fetching crate simple-grid 1.0.4...
[INFO] checking simple-grid-1.0.4 against try#b0d0ea232bdae12fa8da8491a91ae1db029990ef for pr-84037
[INFO] extracting crate simple-grid 1.0.4 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate simple-grid 1.0.4 on toolchain b0d0ea232bdae12fa8da8491a91ae1db029990ef
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple-grid 1.0.4
[INFO] finished tweaking crates.io crate simple-grid 1.0.4
[INFO] tweaked toml for crates.io crate simple-grid 1.0.4 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate simple-grid 1.0.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde v1.0.118
[INFO] [stderr]   Downloaded serde_derive v1.0.118
[INFO] [stderr]   Downloaded syn v1.0.56
[INFO] [stderr]   Downloaded serde_json v1.0.60
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cef0ed316fbe79b2ebe9de29e371d80cda85c5a50f99d9b1a38deb0bac98fe7f
[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" "cef0ed316fbe79b2ebe9de29e371d80cda85c5a50f99d9b1a38deb0bac98fe7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cef0ed316fbe79b2ebe9de29e371d80cda85c5a50f99d9b1a38deb0bac98fe7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cef0ed316fbe79b2ebe9de29e371d80cda85c5a50f99d9b1a38deb0bac98fe7f", kill_on_drop: false }`
[INFO] [stdout] cef0ed316fbe79b2ebe9de29e371d80cda85c5a50f99d9b1a38deb0bac98fe7f
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b0d0ea232bdae12fa8da8491a91ae1db029990ef" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c844393a40ccadc113158866729becdee0545f6a15818a51f3b090cc75a8c6d6
[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" "c844393a40ccadc113158866729becdee0545f6a15818a51f3b090cc75a8c6d6", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]     Checking simple-grid v1.0.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `panic_if_empty`
[INFO] [stdout]   --> src/utils.rs:61:15
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub(crate) fn panic_if_empty<T>(grid: &Grid<T>) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic_if_not_square`
[INFO] [stdout]   --> src/utils.rs:68:15
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub(crate) fn panic_if_not_square<T>(grid: &Grid<T>) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.60
[INFO] [stdout] warning: function is never used: `panic_if_empty`
[INFO] [stdout]   --> src/utils.rs:61:15
[INFO] [stdout]    |
[INFO] [stdout] 61 | pub(crate) fn panic_if_empty<T>(grid: &Grid<T>) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `panic_if_not_square`
[INFO] [stdout]   --> src/utils.rs:68:15
[INFO] [stdout]    |
[INFO] [stdout] 68 | pub(crate) fn panic_if_not_square<T>(grid: &Grid<T>) {
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.31s
[INFO] running `Command { std: "docker" "inspect" "c844393a40ccadc113158866729becdee0545f6a15818a51f3b090cc75a8c6d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c844393a40ccadc113158866729becdee0545f6a15818a51f3b090cc75a8c6d6", kill_on_drop: false }`
[INFO] [stdout] c844393a40ccadc113158866729becdee0545f6a15818a51f3b090cc75a8c6d6