[INFO] updating cached repository https://github.com/lshlyapnikov/grokking-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/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] 32a6326f7d1443ec01c0a022a8bf14d260729d80
[INFO] checking lshlyapnikov/grokking-rust against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Flshlyapnikov%2Fgrokking-rust" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lshlyapnikov/grokking-rust on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking 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 work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/lshlyapnikov/grokking-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/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=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" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 60e811e76b8fde11c9fbac79d218243a52e79a87d2e2b4cb9d72bd652eb411ad
[INFO] running `"docker" "start" "-a" "60e811e76b8fde11c9fbac79d218243a52e79a87d2e2b4cb9d72bd652eb411ad"`
[INFO] [stderr]     Checking libc v0.2.6
[INFO] [stderr]     Checking winapi v0.2.5
[INFO] [stderr]     Checking regex-syntax v0.2.2
[INFO] [stderr]    Compiling advapi32-sys v0.1.2
[INFO] [stderr]     Checking memchr v0.1.7
[INFO] [stderr]     Checking log v0.3.5
[INFO] [stderr]     Checking aho-corasick v0.4.1
[INFO] [stderr]     Checking rand v0.3.13
[INFO] [stderr]     Checking regex v0.1.48
[INFO] [stderr]     Checking env_logger v0.3.2
[INFO] [stderr]     Checking quickcheck v0.2.25
[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:39:1
[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:39:1
[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 14.97s
[INFO] running `"docker" "inspect" "60e811e76b8fde11c9fbac79d218243a52e79a87d2e2b4cb9d72bd652eb411ad"`
[INFO] running `"docker" "rm" "-f" "60e811e76b8fde11c9fbac79d218243a52e79a87d2e2b4cb9d72bd652eb411ad"`
[INFO] [stdout] 60e811e76b8fde11c9fbac79d218243a52e79a87d2e2b4cb9d72bd652eb411ad