[INFO] updating cached repository connorkuehl/rust-merge-sort
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/connorkuehl/rust-merge-sort
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/connorkuehl/rust-merge-sort" "work/ex/clippy-test-run/sources/stable/gh/connorkuehl/rust-merge-sort"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/connorkuehl/rust-merge-sort'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/connorkuehl/rust-merge-sort" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/connorkuehl/rust-merge-sort"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/connorkuehl/rust-merge-sort'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fc86b59c4390886d9a3c460c6e98cc56d0c5d0b0
[INFO] sha for GitHub repo connorkuehl/rust-merge-sort: fc86b59c4390886d9a3c460c6e98cc56d0c5d0b0
[INFO] validating manifest of connorkuehl/rust-merge-sort on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of connorkuehl/rust-merge-sort on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing connorkuehl/rust-merge-sort
[INFO] finished frobbing connorkuehl/rust-merge-sort
[INFO] frobbed toml for connorkuehl/rust-merge-sort written to work/ex/clippy-test-run/sources/stable/gh/connorkuehl/rust-merge-sort/Cargo.toml
[INFO] started frobbing connorkuehl/rust-merge-sort
[INFO] finished frobbing connorkuehl/rust-merge-sort
[INFO] frobbed toml for connorkuehl/rust-merge-sort written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/connorkuehl/rust-merge-sort/Cargo.toml
[INFO] crate connorkuehl/rust-merge-sort has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting connorkuehl/rust-merge-sort against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/connorkuehl/rust-merge-sort:/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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] fbae3c7469160056be3000c1eeb0b4371a8f382317834ab99e4d77f26ecd206f
[INFO] running `"docker" "start" "-a" "fbae3c7469160056be3000c1eeb0b4371a8f382317834ab99e4d77f26ecd206f"`
[INFO] [stderr]     Checking merge_sort v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/lib.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 |     if arr.len() == 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `arr.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/lib.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 |     if arr.len() == 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `arr.is_empty()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `"docker" "inspect" "fbae3c7469160056be3000c1eeb0b4371a8f382317834ab99e4d77f26ecd206f"`
[INFO] running `"docker" "rm" "-f" "fbae3c7469160056be3000c1eeb0b4371a8f382317834ab99e4d77f26ecd206f"`
[INFO] [stdout] fbae3c7469160056be3000c1eeb0b4371a8f382317834ab99e4d77f26ecd206f