[INFO] cloning repository garyemerson/circular_walk
[INFO] running `"git" "clone" "--bare" "git://github.com/garyemerson/circular_walk.git" "work/cache/sources/gh/garyemerson/circular_walk"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/garyemerson/circular_walk'...
[INFO] running `"git" "clone" "work/cache/sources/gh/garyemerson/circular_walk" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/garyemerson/circular_walk"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/garyemerson/circular_walk'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/garyemerson/circular_walk" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/garyemerson/circular_walk"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/garyemerson/circular_walk'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0815ede4471340cf97ed3207bcd4d5b3c09c6e62
[INFO] sha for GitHub repo garyemerson/circular_walk: 0815ede4471340cf97ed3207bcd4d5b3c09c6e62
[INFO] validating manifest of garyemerson/circular_walk on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of garyemerson/circular_walk on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing garyemerson/circular_walk
[INFO] finished frobbing garyemerson/circular_walk
[INFO] frobbed toml for garyemerson/circular_walk written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/garyemerson/circular_walk/Cargo.toml
[INFO] started frobbing garyemerson/circular_walk
[INFO] finished frobbing garyemerson/circular_walk
[INFO] frobbed toml for garyemerson/circular_walk written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/garyemerson/circular_walk/Cargo.toml
[INFO] crate garyemerson/circular_walk already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking garyemerson/circular_walk against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-2/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/garyemerson/circular_walk:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5c813c45bc1222f4b9748349ba6668c0b0fa91932f1d5647ed1964e27c1eee44
[INFO] running `"docker" "start" "-a" "5c813c45bc1222f4b9748349ba6668c0b0fa91932f1d5647ed1964e27c1eee44"`
[INFO] [stderr]     Checking circular_walk v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:65:63
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn get_neighbours(node: usize, n: usize, reach: usize) -> Box<Iterator<Item=usize>> {
[INFO] [stderr]    |                                                               ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=usize>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/main.rs:79:35
[INFO] [stderr]    |
[INFO] [stderr] 79 |         Box::new((start..n).chain((0..(end + 1))))
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/main.rs:81:18
[INFO] [stderr]    |
[INFO] [stderr] 81 |         Box::new((start..(end + 1)))
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:65:63
[INFO] [stderr]    |
[INFO] [stderr] 65 | fn get_neighbours(node: usize, n: usize, reach: usize) -> Box<Iterator<Item=usize>> {
[INFO] [stderr]    |                                                               ^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=usize>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/main.rs:79:35
[INFO] [stderr]    |
[INFO] [stderr] 79 |         Box::new((start..n).chain((0..(end + 1))))
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]   --> src/main.rs:81:18
[INFO] [stderr]    |
[INFO] [stderr] 81 |         Box::new((start..(end + 1)))
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `"docker" "inspect" "5c813c45bc1222f4b9748349ba6668c0b0fa91932f1d5647ed1964e27c1eee44"`
[INFO] running `"docker" "rm" "-f" "5c813c45bc1222f4b9748349ba6668c0b0fa91932f1d5647ed1964e27c1eee44"`
[INFO] [stdout] 5c813c45bc1222f4b9748349ba6668c0b0fa91932f1d5647ed1964e27c1eee44