[INFO] updating cached repository https://github.com/ruduran/game-of-life
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0c7360e0a6cbcea8572bfc5835c30908a367c14b
[INFO] checking ruduran/game-of-life against master#4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb for pr-64672
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruduran%2Fgame-of-life" "work/builds/worker-7/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ruduran/game-of-life on toolchain 4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ruduran/game-of-life
[INFO] finished tweaking git repo https://github.com/ruduran/game-of-life
[INFO] tweaked toml for git repo https://github.com/ruduran/game-of-life written to work/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/ruduran/game-of-life already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 13d9b344bc2ce16b6a4354321ff259deabc242d68866b8fa637c2e53b4d0eca4
[INFO] running `"docker" "start" "-a" "13d9b344bc2ce16b6a4354321ff259deabc242d68866b8fa637c2e53b4d0eca4"`
[INFO] [stderr]    Compiling serde v1.0.59
[INFO] [stderr]     Checking argparse v0.2.1
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]     Checking serde_json v1.0.17
[INFO] [stderr]     Checking game_of_life v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/grid.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         serde_json::to_writer_pretty(file, &g);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]    --> src/grid.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 |         serde_json::to_writer_pretty(file, &g);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.36s
[INFO] running `"docker" "inspect" "13d9b344bc2ce16b6a4354321ff259deabc242d68866b8fa637c2e53b4d0eca4"`
[INFO] running `"docker" "rm" "-f" "13d9b344bc2ce16b6a4354321ff259deabc242d68866b8fa637c2e53b4d0eca4"`
[INFO] [stdout] 13d9b344bc2ce16b6a4354321ff259deabc242d68866b8fa637c2e53b4d0eca4