[INFO] cloning repository https://github.com/highwaybobbery/forest-fire
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/highwaybobbery/forest-fire" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhighwaybobbery%2Fforest-fire", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhighwaybobbery%2Fforest-fire'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 680251920626020f85fdb1e9854fb2b97117853d
[INFO] checking highwaybobbery/forest-fire against master#50e1dc1536264ab71c0850f346b12309477f29f7 for pr-85073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhighwaybobbery%2Fforest-fire" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/highwaybobbery/forest-fire on toolchain 50e1dc1536264ab71c0850f346b12309477f29f7
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/highwaybobbery/forest-fire
[INFO] finished tweaking git repo https://github.com/highwaybobbery/forest-fire
[INFO] tweaked toml for git repo https://github.com/highwaybobbery/forest-fire written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/highwaybobbery/forest-fire already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+50e1dc1536264ab71c0850f346b12309477f29f7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+50e1dc1536264ab71c0850f346b12309477f29f7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e914de4f330e09772e215d03ab0c1a3f031968a008370d94409ce354c9a5014a
[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" "e914de4f330e09772e215d03ab0c1a3f031968a008370d94409ce354c9a5014a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e914de4f330e09772e215d03ab0c1a3f031968a008370d94409ce354c9a5014a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e914de4f330e09772e215d03ab0c1a3f031968a008370d94409ce354c9a5014a", kill_on_drop: false }`
[INFO] [stdout] e914de4f330e09772e215d03ab0c1a3f031968a008370d94409ce354c9a5014a
[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" "+50e1dc1536264ab71c0850f346b12309477f29f7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22fc65a8679536d876c58de756544589339b4460178d597e2a61d597a251d66e
[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" "22fc65a8679536d876c58de756544589339b4460178d597e2a61d597a251d66e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking libc v0.2.11
[INFO] [stderr]     Checking ansi_term v0.7.2
[INFO] [stderr]     Checking rand v0.3.14
[INFO] [stderr]     Checking forest_fire v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0594]: cannot assign to `*tile` which is behind a `&` reference
[INFO] [stdout]   --> src/main.rs:71:17
[INFO] [stdout]    |
[INFO] [stdout] 44 |             for tile in row.iter() {
[INFO] [stdout]    |                         ---------- this iterator yields `&` references
[INFO] [stdout] ...
[INFO] [stdout] 71 |                 *tile = modify_tile(*tile, neighbor_is_burning);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `tile` is a `&` reference, so the data it refers to cannot be written
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0594`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `forest_fire`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0594]: cannot assign to `*tile` which is behind a `&` reference
[INFO] [stdout]   --> src/main.rs:71:17
[INFO] [stdout]    |
[INFO] [stdout] 44 |             for tile in row.iter() {
[INFO] [stdout]    |                         ---------- this iterator yields `&` references
[INFO] [stdout] ...
[INFO] [stdout] 71 |                 *tile = modify_tile(*tile, neighbor_is_burning);
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `tile` is a `&` reference, so the data it refers to cannot be written
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0594`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "22fc65a8679536d876c58de756544589339b4460178d597e2a61d597a251d66e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22fc65a8679536d876c58de756544589339b4460178d597e2a61d597a251d66e", kill_on_drop: false }`
[INFO] [stdout] 22fc65a8679536d876c58de756544589339b4460178d597e2a61d597a251d66e