[INFO] updating cached repository ethowitz/life
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ethowitz/life
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ethowitz/life" "work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/life"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/life'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ethowitz/life" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ethowitz/life"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ethowitz/life'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ed6ce81d54be37f00fcdb639475c3cdcd1c1c598
[INFO] sha for GitHub repo ethowitz/life: ed6ce81d54be37f00fcdb639475c3cdcd1c1c598
[INFO] validating manifest of ethowitz/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 ethowitz/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 ethowitz/life
[INFO] finished frobbing ethowitz/life
[INFO] frobbed toml for ethowitz/life written to work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/life/Cargo.toml
[INFO] started frobbing ethowitz/life
[INFO] finished frobbing ethowitz/life
[INFO] frobbed toml for ethowitz/life written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ethowitz/life/Cargo.toml
[INFO] crate ethowitz/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing ethowitz/life against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 936acafe6b7208c6839c308f630c0c96ba7e1207656e0f49d5ec838da736a59a
[INFO] running `"docker" "start" "-a" "936acafe6b7208c6839c308f630c0c96ba7e1207656e0f49d5ec838da736a59a"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling life v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let gen_char = |x| if rand::random::<i64>() % 4 == 1 {ALIVE} else {' '};
[INFO] [stderr]    |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0506]: cannot assign to `*row` because it is borrowed
[INFO] [stderr]   --> src/main.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         *row = row.into_iter().map(&gen_char).collect();
[INFO] [stderr]    |         ^^^^   ---                 --------- borrow later used here
[INFO] [stderr]    |         |      |
[INFO] [stderr]    |         |      borrow of `*row` occurs here
[INFO] [stderr]    |         assignment to borrowed `*row` occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]    = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]    = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.16s
[INFO] running `"docker" "inspect" "936acafe6b7208c6839c308f630c0c96ba7e1207656e0f49d5ec838da736a59a"`
[INFO] running `"docker" "rm" "-f" "936acafe6b7208c6839c308f630c0c96ba7e1207656e0f49d5ec838da736a59a"`
[INFO] [stdout] 936acafe6b7208c6839c308f630c0c96ba7e1207656e0f49d5ec838da736a59a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] fc896916e6fce7c6d415432631a6d9fa09b5f95eb11baa19aa6bf64e61127427
[INFO] running `"docker" "start" "-a" "fc896916e6fce7c6d415432631a6d9fa09b5f95eb11baa19aa6bf64e61127427"`
[INFO] [stderr]    Compiling life v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/main.rs:55:21
[INFO] [stderr]    |
[INFO] [stderr] 55 |     let gen_char = |x| if rand::random::<i64>() % 4 == 1 {ALIVE} else {' '};
[INFO] [stderr]    |                     ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning[E0506]: cannot assign to `*row` because it is borrowed
[INFO] [stderr]   --> src/main.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         *row = row.into_iter().map(&gen_char).collect();
[INFO] [stderr]    |         ^^^^   ---                 --------- borrow later used here
[INFO] [stderr]    |         |      |
[INFO] [stderr]    |         |      borrow of `*row` occurs here
[INFO] [stderr]    |         assignment to borrowed `*row` occurs here
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]    = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]    = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.55s
[INFO] running `"docker" "inspect" "fc896916e6fce7c6d415432631a6d9fa09b5f95eb11baa19aa6bf64e61127427"`
[INFO] running `"docker" "rm" "-f" "fc896916e6fce7c6d415432631a6d9fa09b5f95eb11baa19aa6bf64e61127427"`
[INFO] [stdout] fc896916e6fce7c6d415432631a6d9fa09b5f95eb11baa19aa6bf64e61127427
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ethowitz/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] c3e248d9890270dda579f3b377aa51fa9294a57865ab198f476f2a46e8a8361a
[INFO] running `"docker" "start" "-a" "c3e248d9890270dda579f3b377aa51fa9294a57865ab198f476f2a46e8a8361a"`
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/life-01d76babe82b220b
[INFO] running `"docker" "inspect" "c3e248d9890270dda579f3b377aa51fa9294a57865ab198f476f2a46e8a8361a"`
[INFO] running `"docker" "rm" "-f" "c3e248d9890270dda579f3b377aa51fa9294a57865ab198f476f2a46e8a8361a"`
[INFO] [stdout] c3e248d9890270dda579f3b377aa51fa9294a57865ab198f476f2a46e8a8361a