[INFO] updating cached repository https://github.com/lshlyapnikov/grokking-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] 5cce67cceb595b89af1df13426ddd9d453c86a06
[INFO] checking lshlyapnikov/grokking-rust against master#30ca215b4e38b32aa7abdd635c5e2d56f5724494 for pr-66037
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flshlyapnikov%2Fgrokking-rust" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lshlyapnikov/grokking-rust on toolchain 30ca215b4e38b32aa7abdd635c5e2d56f5724494
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/lshlyapnikov/grokking-rust
[INFO] removed workspace from git repo https://github.com/lshlyapnikov/grokking-rust
[INFO] finished tweaking git repo https://github.com/lshlyapnikov/grokking-rust
[INFO] tweaked toml for git repo https://github.com/lshlyapnikov/grokking-rust written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/lshlyapnikov/grokking-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-0/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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=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" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "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] 5c70d99586d31f9b72dc219ad540f3c2fc8283d85138d46c1c09d277b9baaa6e
[INFO] running `"docker" "start" "-a" "5c70d99586d31f9b72dc219ad540f3c2fc8283d85138d46c1c09d277b9baaa6e"`
[INFO] [stderr]     Checking grokking-rust v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `volumes`
[INFO] [stderr]   --> src/grok/waterpouring.rs:40:7
[INFO] [stderr]    |
[INFO] [stderr] 40 |   let volumes: Vec<usize> = vec![0, max_volumes.len()];
[INFO] [stderr]    |       ^^^^^^^ help: consider prefixing with an underscore: `_volumes`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `required_volume`
[INFO] [stderr]   --> src/grok/waterpouring.rs:39:40
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn solve(max_volumes: &Vec<usize>, required_volume: usize) -> State {
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_required_volume`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Fill`
[INFO] [stderr]  --> src/grok/waterpouring.rs:5:3
[INFO] [stderr]   |
[INFO] [stderr] 5 |   Fill { glass: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/grok/waterpouring.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   Empty { glass: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Transfer`
[INFO] [stderr]  --> src/grok/waterpouring.rs:7:3
[INFO] [stderr]   |
[INFO] [stderr] 7 |   Transfer { from: usize, to: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve`
[INFO] [stderr]   --> src/grok/waterpouring.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn solve(max_volumes: &Vec<usize>, required_volume: usize) -> State {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `volumes`
[INFO] [stderr]   --> src/grok/waterpouring.rs:40:7
[INFO] [stderr]    |
[INFO] [stderr] 40 |   let volumes: Vec<usize> = vec![0, max_volumes.len()];
[INFO] [stderr]    |       ^^^^^^^ help: consider prefixing with an underscore: `_volumes`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `required_volume`
[INFO] [stderr]   --> src/grok/waterpouring.rs:39:40
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn solve(max_volumes: &Vec<usize>, required_volume: usize) -> State {
[INFO] [stderr]    |                                        ^^^^^^^^^^^^^^^ help: consider prefixing with an underscore: `_required_volume`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Fill`
[INFO] [stderr]  --> src/grok/waterpouring.rs:5:3
[INFO] [stderr]   |
[INFO] [stderr] 5 |   Fill { glass: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Empty`
[INFO] [stderr]  --> src/grok/waterpouring.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   Empty { glass: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Transfer`
[INFO] [stderr]  --> src/grok/waterpouring.rs:7:3
[INFO] [stderr]   |
[INFO] [stderr] 7 |   Transfer { from: usize, to: usize },
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `solve`
[INFO] [stderr]   --> src/grok/waterpouring.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn solve(max_volumes: &Vec<usize>, required_volume: usize) -> State {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.79s
[INFO] running `"docker" "inspect" "5c70d99586d31f9b72dc219ad540f3c2fc8283d85138d46c1c09d277b9baaa6e"`
[INFO] running `"docker" "rm" "-f" "5c70d99586d31f9b72dc219ad540f3c2fc8283d85138d46c1c09d277b9baaa6e"`
[INFO] [stdout] 5c70d99586d31f9b72dc219ad540f3c2fc8283d85138d46c1c09d277b9baaa6e