[INFO] updating cached repository arizuk/rust-competitive-programming-snippets
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/arizuk/rust-competitive-programming-snippets
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/arizuk/rust-competitive-programming-snippets" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/arizuk/rust-competitive-programming-snippets"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/arizuk/rust-competitive-programming-snippets'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arizuk/rust-competitive-programming-snippets" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/arizuk/rust-competitive-programming-snippets"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/arizuk/rust-competitive-programming-snippets'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 62b91191853509afe7bf8f79af38383e7ff0dde2
[INFO] sha for GitHub repo arizuk/rust-competitive-programming-snippets: 62b91191853509afe7bf8f79af38383e7ff0dde2
[INFO] validating manifest of arizuk/rust-competitive-programming-snippets on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of arizuk/rust-competitive-programming-snippets on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing arizuk/rust-competitive-programming-snippets
[INFO] finished frobbing arizuk/rust-competitive-programming-snippets
[INFO] frobbed toml for arizuk/rust-competitive-programming-snippets written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/arizuk/rust-competitive-programming-snippets/Cargo.toml
[INFO] started frobbing arizuk/rust-competitive-programming-snippets
[INFO] finished frobbing arizuk/rust-competitive-programming-snippets
[INFO] frobbed toml for arizuk/rust-competitive-programming-snippets written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/arizuk/rust-competitive-programming-snippets/Cargo.toml
[INFO] crate arizuk/rust-competitive-programming-snippets already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking arizuk/rust-competitive-programming-snippets against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-5/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/arizuk/rust-competitive-programming-snippets:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/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" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 199223d8708db74998e6045c61553c305f80ac9b8df63f2309827e5fd8a53568
[INFO] running `"docker" "start" "-a" "199223d8708db74998e6045c61553c305f80ac9b8df63f2309827e5fd8a53568"`
[INFO] [stderr]    Compiling cargo-snippet v0.2.5
[INFO] [stderr]     Checking snippets v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `UnionFind`
[INFO] [stderr]  --> src/union_find.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct UnionFind {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]  --> src/union_find.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn new(n: usize) -> UnionFind {
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `find`
[INFO] [stderr]   --> src/union_find.rs:17:5
[INFO] [stderr]    |
[INFO] [stderr] 17 |     fn find(&mut self, x: usize) -> usize {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `same`
[INFO] [stderr]   --> src/union_find.rs:28:5
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn same(&mut self, a: usize, b: usize) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `unite`
[INFO] [stderr]   --> src/union_find.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn unite(&mut self, a: usize, b: usize) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.94s
[INFO] running `"docker" "inspect" "199223d8708db74998e6045c61553c305f80ac9b8df63f2309827e5fd8a53568"`
[INFO] running `"docker" "rm" "-f" "199223d8708db74998e6045c61553c305f80ac9b8df63f2309827e5fd8a53568"`
[INFO] [stdout] 199223d8708db74998e6045c61553c305f80ac9b8df63f2309827e5fd8a53568