[INFO] updating cached repository https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] running `"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"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c3bc0fb9d67e83dd44696add162c475e73dd0214
[INFO] checking sliechti/lets-build-a-compiler-rust against beta-2019-10-27 for pr-65897
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsliechti%2Flets-build-a-compiler-rust" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sliechti/lets-build-a-compiler-rust on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] finished tweaking git repo https://github.com/sliechti/lets-build-a-compiler-rust
[INFO] tweaked toml for git repo https://github.com/sliechti/lets-build-a-compiler-rust written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/sliechti/lets-build-a-compiler-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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=allow" "-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-2019-10-27" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] bf8fbe40ff214a68e1493d9070ff736e0fd1f71518c49e38859d419cbca16e75
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "bf8fbe40ff214a68e1493d9070ff736e0fd1f71518c49e38859d419cbca16e75"`
[INFO] [stderr]     Checking rustcompiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:5:30
[INFO] [stderr]   |
[INFO] [stderr] 5 |     assert_eq!(true, cradle::is_alpha('a'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:6:30
[INFO] [stderr]   |
[INFO] [stderr] 6 |     assert_eq!(true, cradle::is_alpha('A'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:7:30
[INFO] [stderr]   |
[INFO] [stderr] 7 |     assert_eq!(true, cradle::is_alpha('X'));
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:8:31
[INFO] [stderr]   |
[INFO] [stderr] 8 |     assert_eq!(false, cradle::is_alpha('5'));
[INFO] [stderr]   |                               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: function `is_alpha` is private
[INFO] [stderr]  --> src/unittest.rs:9:31
[INFO] [stderr]   |
[INFO] [stderr] 9 |     assert_eq!(false, cradle::is_alpha('0'));
[INFO] [stderr]   |                               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0603`.
[INFO] [stderr] error: could not compile `rustcompiler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bf8fbe40ff214a68e1493d9070ff736e0fd1f71518c49e38859d419cbca16e75"`
[INFO] running `"docker" "rm" "-f" "bf8fbe40ff214a68e1493d9070ff736e0fd1f71518c49e38859d419cbca16e75"`
[INFO] [stdout] bf8fbe40ff214a68e1493d9070ff736e0fd1f71518c49e38859d419cbca16e75