[INFO] updating cached repository jotingen/rust-sudokusolver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jotingen/rust-sudokusolver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jotingen/rust-sudokusolver" "work/ex/clippy-test-run/sources/stable/gh/jotingen/rust-sudokusolver"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/jotingen/rust-sudokusolver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jotingen/rust-sudokusolver" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jotingen/rust-sudokusolver"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jotingen/rust-sudokusolver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5655b077a8c3cc64745ed0aa130370f5dfcf9c9e
[INFO] sha for GitHub repo jotingen/rust-sudokusolver: 5655b077a8c3cc64745ed0aa130370f5dfcf9c9e
[INFO] validating manifest of jotingen/rust-sudokusolver 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 jotingen/rust-sudokusolver 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 jotingen/rust-sudokusolver
[INFO] finished frobbing jotingen/rust-sudokusolver
[INFO] frobbed toml for jotingen/rust-sudokusolver written to work/ex/clippy-test-run/sources/stable/gh/jotingen/rust-sudokusolver/Cargo.toml
[INFO] started frobbing jotingen/rust-sudokusolver
[INFO] finished frobbing jotingen/rust-sudokusolver
[INFO] frobbed toml for jotingen/rust-sudokusolver written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jotingen/rust-sudokusolver/Cargo.toml
[INFO] crate jotingen/rust-sudokusolver 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 jotingen/rust-sudokusolver against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jotingen/rust-sudokusolver:/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 -Dclippy::into_iter_on_array" "-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] bc6418a68ff44aeab347687317f2615b2151d9365f89abb2239e78bd83cfcfe6
[INFO] running `"docker" "start" "-a" "bc6418a68ff44aeab347687317f2615b2151d9365f89abb2239e78bd83cfcfe6"`
[INFO] [stderr]     Checking rust-sudokusolver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]   --> src/main.rs:72:17
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let mut b = 0;
[INFO] [stderr]    |                 ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]   --> src/main.rs:72:17
[INFO] [stderr]    |
[INFO] [stderr] 72 |         let mut b = 0;
[INFO] [stderr]    |                 ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     return a;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/main.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 | /             if i / 27 * 3 + (i / 3) % 3 == b / 27 * 3 + (b / 3) % 3 {
[INFO] [stderr] 75 | |                 if b != i && a[b] == a[i] {
[INFO] [stderr] 76 | |                     fail = true;
[INFO] [stderr] 77 | |                 }
[INFO] [stderr] 78 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 74 |             if i / 27 * 3 + (i / 3) % 3 == b / 27 * 3 + (b / 3) % 3 && b != i && a[b] == a[i] {
[INFO] [stderr] 75 |     fail = true;
[INFO] [stderr] 76 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:86:5
[INFO] [stderr]    |
[INFO] [stderr] 86 |     return a;
[INFO] [stderr]    |     ^^^^^^^^^ help: remove `return` as shown: `a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/main.rs:74:13
[INFO] [stderr]    |
[INFO] [stderr] 74 | /             if i / 27 * 3 + (i / 3) % 3 == b / 27 * 3 + (b / 3) % 3 {
[INFO] [stderr] 75 | |                 if b != i && a[b] == a[i] {
[INFO] [stderr] 76 | |                     fail = true;
[INFO] [stderr] 77 | |                 }
[INFO] [stderr] 78 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]    |
[INFO] [stderr] 74 |             if i / 27 * 3 + (i / 3) % 3 == b / 27 * 3 + (b / 3) % 3 && b != i && a[b] == a[i] {
[INFO] [stderr] 75 |     fail = true;
[INFO] [stderr] 76 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: the variable `i` is used as a loop counter. Consider using `for (i, item) in args[1].chars().enumerate()` or similar iterators
[INFO] [stderr]   --> src/main.rs:16:14
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for c in args[1].chars() {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::explicit_counter_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/main.rs:27:29
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut a: [u8; SIZE] = hint.clone();
[INFO] [stderr]    |                             ^^^^^^^^^^^^ help: try dereferencing it: `*hint`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: the variable `counter` is used as a loop counter. Consider using `for (counter, item) in array.iter().enumerate()` or similar iterators
[INFO] [stderr]   --> src/main.rs:91:14
[INFO] [stderr]    |
[INFO] [stderr] 91 |     for x in array.iter() {
[INFO] [stderr]    |              ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr] warning: the variable `i` is used as a loop counter. Consider using `for (i, item) in args[1].chars().enumerate()` or similar iterators
[INFO] [stderr]   --> src/main.rs:16:14
[INFO] [stderr]    |
[INFO] [stderr] 16 |     for c in args[1].chars() {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::explicit_counter_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/main.rs:27:29
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let mut a: [u8; SIZE] = hint.clone();
[INFO] [stderr]    |                             ^^^^^^^^^^^^ help: try dereferencing it: `*hint`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: the variable `counter` is used as a loop counter. Consider using `for (counter, item) in array.iter().enumerate()` or similar iterators
[INFO] [stderr]   --> src/main.rs:91:14
[INFO] [stderr]    |
[INFO] [stderr] 91 |     for x in array.iter() {
[INFO] [stderr]    |              ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `"docker" "inspect" "bc6418a68ff44aeab347687317f2615b2151d9365f89abb2239e78bd83cfcfe6"`
[INFO] running `"docker" "rm" "-f" "bc6418a68ff44aeab347687317f2615b2151d9365f89abb2239e78bd83cfcfe6"`
[INFO] [stdout] bc6418a68ff44aeab347687317f2615b2151d9365f89abb2239e78bd83cfcfe6