[INFO] updating cached repository https://github.com/rinatz/ninety-nine-rust-problems
[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] dd78a35a6b216c4d0ae7ec18807869ecc358c23f
[INFO] checking rinatz/ninety-nine-rust-problems against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frinatz%2Fninety-nine-rust-problems" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rinatz/ninety-nine-rust-problems on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rinatz/ninety-nine-rust-problems
[INFO] finished tweaking git repo https://github.com/rinatz/ninety-nine-rust-problems
[INFO] tweaked toml for git repo https://github.com/rinatz/ninety-nine-rust-problems written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/rinatz/ninety-nine-rust-problems already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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=forbid" "-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" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] e4f786fb73866a38fb6fd18857507003ca36646d3fea329e43473248661d352d
[INFO] running `"docker" "start" "-a" "e4f786fb73866a38fb6fd18857507003ca36646d3fea329e43473248661d352d"`
[INFO] [stderr]     Checking ninety-nine-rust-problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0601]: `main` function not found in crate `ninety_nine_rust_problems`
[INFO] [stderr]    --> src/main.rs:2:1
[INFO] [stderr]     |
[INFO] [stderr] 2   | / mod p01 {
[INFO] [stderr] 3   | |     fn last<T>(vec: &Vec<T>) -> Option<&T> {
[INFO] [stderr] 4   | |         vec.last()
[INFO] [stderr] 5   | |     }
[INFO] [stderr] ...   |
[INFO] [stderr] 233 | |     }
[INFO] [stderr] 234 | | }
[INFO] [stderr]     | |_^ consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `ninety-nine-rust-problems`.
[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] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e4f786fb73866a38fb6fd18857507003ca36646d3fea329e43473248661d352d"`
[INFO] running `"docker" "rm" "-f" "e4f786fb73866a38fb6fd18857507003ca36646d3fea329e43473248661d352d"`
[INFO] [stdout] e4f786fb73866a38fb6fd18857507003ca36646d3fea329e43473248661d352d