[INFO] updating cached repository https://github.com/fede1024/2048-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0384714d89e139523f78d1aa6302e45700b681f5
[INFO] testing fede1024/2048-rust against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffede1024%2F2048-rust" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fede1024/2048-rust on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/fede1024/2048-rust
[INFO] finished tweaking git repo https://github.com/fede1024/2048-rust
[INFO] tweaked toml for git repo https://github.com/fede1024/2048-rust written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/fede1024/2048-rust already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-6/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] c2139f5e5066532fd154208d271ce1b7caddf68bdc0d796c8fe29b459e4dc0e7
[INFO] running `"docker" "start" "-a" "c2139f5e5066532fd154208d271ce1b7caddf68bdc0d796c8fe29b459e4dc0e7"`
[INFO] [stderr]    Compiling 2048-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0446]: private type `world::line_world_16::LineWorld16Iter<'a>` in public interface
[INFO] [stderr]    --> src/world/line_world_16.rs:108:5
[INFO] [stderr]     |
[INFO] [stderr] 73  | struct LineWorld16Iter<'a> {
[INFO] [stderr]     | - `world::line_world_16::LineWorld16Iter<'a>` declared as private
[INFO] [stderr] ...
[INFO] [stderr] 108 |     type Iter = LineWorld16Iter<'a>;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] 
[INFO] [stderr] warning: private type `world::line_world_16::LineWorld16Iter<'a>` in public interface (error E0446)
[INFO] [stderr]    --> src/world/line_world_16.rs:132:5
[INFO] [stderr]     |
[INFO] [stderr] 132 | /     fn iterate(&'a self) -> LineWorld16Iter<'a> {
[INFO] [stderr] 133 | |         LineWorld16Iter {
[INFO] [stderr] 134 | |             world: self,
[INFO] [stderr] 135 | |             count: 0,
[INFO] [stderr] 136 | |         }
[INFO] [stderr] 137 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(private_in_public)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0446`.
[INFO] [stderr] error: could not compile `2048-rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c2139f5e5066532fd154208d271ce1b7caddf68bdc0d796c8fe29b459e4dc0e7"`
[INFO] running `"docker" "rm" "-f" "c2139f5e5066532fd154208d271ce1b7caddf68bdc0d796c8fe29b459e4dc0e7"`
[INFO] [stdout] c2139f5e5066532fd154208d271ce1b7caddf68bdc0d796c8fe29b459e4dc0e7