[INFO] updating cached repository https://github.com/AntoineSebert/local_hack_day_2018
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d2c5e66d2b273bd11288fa8fcfe99e197e319f64
[INFO] testing AntoineSebert/local_hack_day_2018 against beta-2020-07-24 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAntoineSebert%2Flocal_hack_day_2018" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/AntoineSebert/local_hack_day_2018 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AntoineSebert/local_hack_day_2018
[INFO] finished tweaking git repo https://github.com/AntoineSebert/local_hack_day_2018
[INFO] tweaked toml for git repo https://github.com/AntoineSebert/local_hack_day_2018 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/AntoineSebert/local_hack_day_2018 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9ff523a4fe611bc89ac4e268cd1703c621caf23c75aa055cdaa00069957bf631
[INFO] running `Command { std: "docker" "start" "-a" "9ff523a4fe611bc89ac4e268cd1703c621caf23c75aa055cdaa00069957bf631", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ff523a4fe611bc89ac4e268cd1703c621caf23c75aa055cdaa00069957bf631", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ff523a4fe611bc89ac4e268cd1703c621caf23c75aa055cdaa00069957bf631", kill_on_drop: false }`
[INFO] [stdout] 9ff523a4fe611bc89ac4e268cd1703c621caf23c75aa055cdaa00069957bf631
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 541309c194027a43f18d68e4b6542f46feb582c8462d00b52265b86e4a1c7939
[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" "541309c194027a43f18d68e4b6542f46feb582c8462d00b52265b86e4a1c7939", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]    Compiling toml v0.4.9
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling local_hack_day_2018 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:71:17
[INFO] [stdout]    |
[INFO] [stdout] 71 |             let mut neighbors: u8 = 0;
[INFO] [stdout]    |                 ----^^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/main.rs:126:9
[INFO] [stdout]     |
[INFO] [stdout] 126 |     for mut element in cells_to_update.iter_mut() {
[INFO] [stdout]     |         ----^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `world[_][_]` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> src/main.rs:114:34
[INFO] [stdout]     |
[INFO] [stdout] 114 |             let is_alive: bool = world[n][n_2].clone(); 
[INFO] [stdout]     |                                  ^^^^^^^^^^^^^ immutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 121 |                 cells_to_update.push(&mut world[n][n_2]);
[INFO] [stdout]     |                 ---------------      ------------------ mutable borrow occurs here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 mutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `world[_][_]` as mutable more than once at a time
[INFO] [stdout]    --> src/main.rs:117:42
[INFO] [stdout]     |
[INFO] [stdout] 117 |                     cells_to_update.push(&mut world[n][n_2]);
[INFO] [stdout]     |                                          ^^^^^^^^^^^^^^^^^^ second mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 121 |                 cells_to_update.push(&mut world[n][n_2]);
[INFO] [stdout]     |                                      ------------------ first mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 126 |     for mut element in cells_to_update.iter_mut() {
[INFO] [stdout]     |                        --------------- first borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `world[_][_]` as mutable more than once at a time
[INFO] [stdout]    --> src/main.rs:121:38
[INFO] [stdout]     |
[INFO] [stdout] 121 |                 cells_to_update.push(&mut world[n][n_2]);
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^^ mutable borrow starts here in previous iteration of loop
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0499, E0502.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `local_hack_day_2018`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "541309c194027a43f18d68e4b6542f46feb582c8462d00b52265b86e4a1c7939", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "541309c194027a43f18d68e4b6542f46feb582c8462d00b52265b86e4a1c7939", kill_on_drop: false }`
[INFO] [stdout] 541309c194027a43f18d68e4b6542f46feb582c8462d00b52265b86e4a1c7939