[INFO] updating cached repository ruduran/game-of-life
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ruduran/game-of-life
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ruduran/game-of-life" "work/ex/beta-1.38-1/sources/1.37.0/gh/ruduran/game-of-life"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ruduran/game-of-life'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ruduran/game-of-life" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0c7360e0a6cbcea8572bfc5835c30908a367c14b
[INFO] sha for GitHub repo ruduran/game-of-life: 0c7360e0a6cbcea8572bfc5835c30908a367c14b
[INFO] validating manifest of ruduran/game-of-life on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ruduran/game-of-life on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ruduran/game-of-life
[INFO] finished frobbing ruduran/game-of-life
[INFO] frobbed toml for ruduran/game-of-life written to work/ex/beta-1.38-1/sources/1.37.0/gh/ruduran/game-of-life/Cargo.toml
[INFO] started frobbing ruduran/game-of-life
[INFO] finished frobbing ruduran/game-of-life
[INFO] frobbed toml for ruduran/game-of-life written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life/Cargo.toml
[INFO] crate ruduran/game-of-life already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing ruduran/game-of-life against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b1aba45d212fe24ad47f8efee19fc5ff40f9c0a7a9deb705b96e54b7989ca9bf
[INFO] running `"docker" "start" "-a" "b1aba45d212fe24ad47f8efee19fc5ff40f9c0a7a9deb705b96e54b7989ca9bf"`
[INFO] [stderr]    Compiling serde v1.0.59
[INFO] [stderr]    Compiling argparse v0.2.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.3
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]    Compiling quote v0.6.2
[INFO] [stderr]    Compiling syn v0.14.0
[INFO] [stderr]    Compiling serde_derive v1.0.59
[INFO] [stderr]    Compiling serde_json v1.0.17
[INFO] [stderr]    Compiling game_of_life v0.1.0 (/opt/crater/workdir)
[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]     Finished dev [unoptimized + debuginfo] target(s) in 40.22s
[INFO] running `"docker" "inspect" "b1aba45d212fe24ad47f8efee19fc5ff40f9c0a7a9deb705b96e54b7989ca9bf"`
[INFO] running `"docker" "rm" "-f" "b1aba45d212fe24ad47f8efee19fc5ff40f9c0a7a9deb705b96e54b7989ca9bf"`
[INFO] [stdout] b1aba45d212fe24ad47f8efee19fc5ff40f9c0a7a9deb705b96e54b7989ca9bf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] b14697bd74859c18192adb0cd35444976ae0f5d62f8c52aea46850f733868925
[INFO] running `"docker" "start" "-a" "b14697bd74859c18192adb0cd35444976ae0f5d62f8c52aea46850f733868925"`
[INFO] [stderr]    Compiling game_of_life v0.1.0 (/opt/crater/workdir)
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "b14697bd74859c18192adb0cd35444976ae0f5d62f8c52aea46850f733868925"`
[INFO] running `"docker" "rm" "-f" "b14697bd74859c18192adb0cd35444976ae0f5d62f8c52aea46850f733868925"`
[INFO] [stdout] b14697bd74859c18192adb0cd35444976ae0f5d62f8c52aea46850f733868925
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ruduran/game-of-life:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] a5bd78ca5ef580a9f792e4b1a4fe6cc6df33ae08f8e20adeca8721215a81d6e9
[INFO] running `"docker" "start" "-a" "a5bd78ca5ef580a9f792e4b1a4fe6cc6df33ae08f8e20adeca8721215a81d6e9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/game_of_life-fb211f25f05dfa19
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "a5bd78ca5ef580a9f792e4b1a4fe6cc6df33ae08f8e20adeca8721215a81d6e9"`
[INFO] running `"docker" "rm" "-f" "a5bd78ca5ef580a9f792e4b1a4fe6cc6df33ae08f8e20adeca8721215a81d6e9"`
[INFO] [stdout] a5bd78ca5ef580a9f792e4b1a4fe6cc6df33ae08f8e20adeca8721215a81d6e9