[INFO] updating cached repository highwaybobbery/forest-fire
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/highwaybobbery/forest-fire
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/highwaybobbery/forest-fire" "work/ex/beta-1.38-1/sources/1.37.0/gh/highwaybobbery/forest-fire"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/highwaybobbery/forest-fire'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/highwaybobbery/forest-fire" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/highwaybobbery/forest-fire"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/highwaybobbery/forest-fire'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 680251920626020f85fdb1e9854fb2b97117853d
[INFO] sha for GitHub repo highwaybobbery/forest-fire: 680251920626020f85fdb1e9854fb2b97117853d
[INFO] validating manifest of highwaybobbery/forest-fire 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 highwaybobbery/forest-fire 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 highwaybobbery/forest-fire
[INFO] finished frobbing highwaybobbery/forest-fire
[INFO] frobbed toml for highwaybobbery/forest-fire written to work/ex/beta-1.38-1/sources/1.37.0/gh/highwaybobbery/forest-fire/Cargo.toml
[INFO] started frobbing highwaybobbery/forest-fire
[INFO] finished frobbing highwaybobbery/forest-fire
[INFO] frobbed toml for highwaybobbery/forest-fire written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/highwaybobbery/forest-fire/Cargo.toml
[INFO] crate highwaybobbery/forest-fire 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/highwaybobbery/forest-fire/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 highwaybobbery/forest-fire 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/highwaybobbery/forest-fire:/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] 134c64010422eba06a8cbbc4d53389a89b70f2207365105e7a0d433edbc0138e
[INFO] running `"docker" "start" "-a" "134c64010422eba06a8cbbc4d53389a89b70f2207365105e7a0d433edbc0138e"`
[INFO] [stderr]    Compiling ansi_term v0.7.5
[INFO] [stderr]    Compiling forest_fire v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0594]: cannot assign to `*tile` which is behind a `&` reference
[INFO] [stderr]   --> src/main.rs:71:17
[INFO] [stderr]    |
[INFO] [stderr] 44 |             for tile in row.iter() {
[INFO] [stderr]    |                 ---- help: consider changing this to be a mutable reference: `&mut Tile`
[INFO] [stderr] ...
[INFO] [stderr] 71 |                 *tile = modify_tile(*tile, neighbor_is_burning);
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `tile` is a `&` reference, so the data it refers to cannot be written
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `forest_fire`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "134c64010422eba06a8cbbc4d53389a89b70f2207365105e7a0d433edbc0138e"`
[INFO] running `"docker" "rm" "-f" "134c64010422eba06a8cbbc4d53389a89b70f2207365105e7a0d433edbc0138e"`
[INFO] [stdout] 134c64010422eba06a8cbbc4d53389a89b70f2207365105e7a0d433edbc0138e