[INFO] cloning repository https://github.com/rinatz/ninety-nine-rust-problems
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rinatz/ninety-nine-rust-problems" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frinatz%2Fninety-nine-rust-problems", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frinatz%2Fninety-nine-rust-problems'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd78a35a6b216c4d0ae7ec18807869ecc358c23f
[INFO] checking rinatz/ninety-nine-rust-problems against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frinatz%2Fninety-nine-rust-problems" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[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 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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 `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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" "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" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab66a0fa2fbf60370a46be1ae7e947ba2aac87a3f63109936e480572b6ea17d9
[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" "ab66a0fa2fbf60370a46be1ae7e947ba2aac87a3f63109936e480572b6ea17d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab66a0fa2fbf60370a46be1ae7e947ba2aac87a3f63109936e480572b6ea17d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab66a0fa2fbf60370a46be1ae7e947ba2aac87a3f63109936e480572b6ea17d9", kill_on_drop: false }`
[INFO] [stdout] ab66a0fa2fbf60370a46be1ae7e947ba2aac87a3f63109936e480572b6ea17d9
[INFO] running `Command { std: "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" "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" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbf1708376b6566e739968e8ab5273d9991b107ab3cb3c51c3354dd880f796f2
[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" "bbf1708376b6566e739968e8ab5273d9991b107ab3cb3c51c3354dd880f796f2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking ninety-nine-rust-problems v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0601]: `main` function not found in crate `ninety_nine_rust_problems`
[INFO] [stdout]    --> src/main.rs:2:1
[INFO] [stdout]     |
[INFO] [stdout] 2   | / mod p01 {
[INFO] [stdout] 3   | |     fn last<T>(vec: &Vec<T>) -> Option<&T> {
[INFO] [stdout] 4   | |         vec.last()
[INFO] [stdout] 5   | |     }
[INFO] [stdout] ...   |
[INFO] [stdout] 233 | |     }
[INFO] [stdout] 234 | | }
[INFO] [stdout]     | |_^ consider adding a `main` function to `src/main.rs`
[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 E0601`.
[INFO] [stdout] 
[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 `Command { std: "docker" "inspect" "bbf1708376b6566e739968e8ab5273d9991b107ab3cb3c51c3354dd880f796f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbf1708376b6566e739968e8ab5273d9991b107ab3cb3c51c3354dd880f796f2", kill_on_drop: false }`
[INFO] [stdout] bbf1708376b6566e739968e8ab5273d9991b107ab3cb3c51c3354dd880f796f2