[INFO] updating cached repository erictzeng/advent2016
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/erictzeng/advent2016
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/erictzeng/advent2016" "work/ex/clippy-test-run/sources/stable/gh/erictzeng/advent2016"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/erictzeng/advent2016'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/erictzeng/advent2016" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/erictzeng/advent2016"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/erictzeng/advent2016'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 519436fb7576d78bdc1389ecd3b78a0b00e6df74
[INFO] sha for GitHub repo erictzeng/advent2016: 519436fb7576d78bdc1389ecd3b78a0b00e6df74
[INFO] validating manifest of erictzeng/advent2016 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 erictzeng/advent2016 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 erictzeng/advent2016
[INFO] finished frobbing erictzeng/advent2016
[INFO] frobbed toml for erictzeng/advent2016 written to work/ex/clippy-test-run/sources/stable/gh/erictzeng/advent2016/Cargo.toml
[INFO] started frobbing erictzeng/advent2016
[INFO] finished frobbing erictzeng/advent2016
[INFO] frobbed toml for erictzeng/advent2016 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/erictzeng/advent2016/Cargo.toml
[INFO] crate erictzeng/advent2016 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 erictzeng/advent2016 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/erictzeng/advent2016:/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] 767a5077ad4391a82cbd8aaaec9030fc12a8a357b408462584b66b8b5ccf72b8
[INFO] running `"docker" "start" "-a" "767a5077ad4391a82cbd8aaaec9030fc12a8a357b408462584b66b8b5ccf72b8"`
[INFO] [stderr]     Checking md5 v0.2.1
[INFO] [stderr]     Checking num-complex v0.1.35
[INFO] [stderr]     Checking num-bigint v0.1.35
[INFO] [stderr]     Checking num-rational v0.1.35
[INFO] [stderr]     Checking num v0.1.36
[INFO] [stderr]     Checking advent v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/bin/day4.rs:42:25
[INFO] [stderr]    |
[INFO] [stderr] 42 |         heap.push(Entry{char: char, count: count});
[INFO] [stderr]    |                         ^^^^^^^^^^ help: replace it with: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/bin/day4.rs:42:37
[INFO] [stderr]    |
[INFO] [stderr] 42 |         heap.push(Entry{char: char, count: count});
[INFO] [stderr]    |                                     ^^^^^^^^^^^^ help: replace it with: `count`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/day7.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     return false;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[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: length comparison to zero
[INFO] [stderr]   --> src/bin/day3.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |         if col_tris.len() == 0 || col_tris[col_tris.len() - 1].len() == 3 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `col_tris.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: using `println!("")`
[INFO] [stderr]   --> src/bin/day8.rs:71:13
[INFO] [stderr]    |
[INFO] [stderr] 71 |             println!("");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/bin/day8.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |                 println!("");
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/day4.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     return checksum == get_checksum(room)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `checksum == get_checksum(room)`
[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: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/bin/day4.rs:58:16
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let base = 'a' as u8;
[INFO] [stderr]    |                ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::char_lit_as_u8)] on by default
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'a'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 |     visited.insert(pos.clone());
[INFO] [stderr]    |                    ^^^^^^^^^^^ help: try removing the `clone` call: `pos`
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:24:23
[INFO] [stderr]    |
[INFO] [stderr] 24 |             let dir = dirs[dir_index].clone();
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `dirs[dir_index]`
[INFO] [stderr]    |
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:37:36
[INFO] [stderr]    |
[INFO] [stderr] 37 |                     visited.insert(pos.clone());
[INFO] [stderr]    |                                    ^^^^^^^^^^^ help: try removing the `clone` call: `pos`
[INFO] [stderr]    |
[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: using `println!("")`
[INFO] [stderr]   --> src/bin/day8.rs:71:13
[INFO] [stderr]    |
[INFO] [stderr] 71 |             println!("");
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/bin/day8.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |                 println!("");
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/bin/day4.rs:42:25
[INFO] [stderr]    |
[INFO] [stderr] 42 |         heap.push(Entry{char: char, count: count});
[INFO] [stderr]    |                         ^^^^^^^^^^ help: replace it with: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/bin/day4.rs:42:37
[INFO] [stderr]    |
[INFO] [stderr] 42 |         heap.push(Entry{char: char, count: count});
[INFO] [stderr]    |                                     ^^^^^^^^^^^^ help: replace it with: `count`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/bin/day2.rs:30:17
[INFO] [stderr]    |
[INFO] [stderr] 30 | /                 if next_pos.1 < keypad.len() {
[INFO] [stderr] 31 | |                     if next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 32 | |                         if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 33 | |                             positions[keypad_ind] = next_pos;
[INFO] [stderr] 34 | |                         }
[INFO] [stderr] 35 | |                     }
[INFO] [stderr] 36 | |                 }
[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] 30 |                 if next_pos.1 < keypad.len() && next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 31 |     if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 32 |         positions[keypad_ind] = next_pos;
[INFO] [stderr] 33 |     }
[INFO] [stderr] 34 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/bin/day2.rs:31:21
[INFO] [stderr]    |
[INFO] [stderr] 31 | /                     if next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 32 | |                         if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 33 | |                             positions[keypad_ind] = next_pos;
[INFO] [stderr] 34 | |                         }
[INFO] [stderr] 35 | |                     }
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[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] 31 |                     if next_pos.0 < keypad[next_pos.1].len() && keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 32 |     positions[keypad_ind] = next_pos;
[INFO] [stderr] 33 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/bin/day2.rs:30:17
[INFO] [stderr]    |
[INFO] [stderr] 30 | /                 if next_pos.1 < keypad.len() {
[INFO] [stderr] 31 | |                     if next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 32 | |                         if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 33 | |                             positions[keypad_ind] = next_pos;
[INFO] [stderr] 34 | |                         }
[INFO] [stderr] 35 | |                     }
[INFO] [stderr] 36 | |                 }
[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] 30 |                 if next_pos.1 < keypad.len() && next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 31 |     if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 32 |         positions[keypad_ind] = next_pos;
[INFO] [stderr] 33 |     }
[INFO] [stderr] 34 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: this if statement can be collapsed
[INFO] [stderr]   --> src/bin/day2.rs:31:21
[INFO] [stderr]    |
[INFO] [stderr] 31 | /                     if next_pos.0 < keypad[next_pos.1].len() {
[INFO] [stderr] 32 | |                         if keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 33 | |                             positions[keypad_ind] = next_pos;
[INFO] [stderr] 34 | |                         }
[INFO] [stderr] 35 | |                     }
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[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] 31 |                     if next_pos.0 < keypad[next_pos.1].len() && keypad[next_pos.1][next_pos.0] != " " {
[INFO] [stderr] 32 |     positions[keypad_ind] = next_pos;
[INFO] [stderr] 33 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/bin/day2.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 |                 let ref keypad = keypads[keypad_ind];
[INFO] [stderr]    |                 ----^^^^^^^^^^----------------------- help: try: `let keypad = &keypads[keypad_ind];`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/bin/day2.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |             let ref keypad = keypads[keypad_ind];
[INFO] [stderr]    |             ----^^^^^^^^^^----------------------- help: try: `let keypad = &keypads[keypad_ind];`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `keypad_ind` is used to index `codes`
[INFO] [stderr]   --> src/bin/day2.rs:45:23
[INFO] [stderr]    |
[INFO] [stderr] 45 |     for keypad_ind in 0..2 {
[INFO] [stderr]    |                       ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 45 |     for (keypad_ind, <item>) in codes.iter().enumerate().take(2) {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/bin/day3.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |         if col_tris.len() == 0 || col_tris[col_tris.len() - 1].len() == 3 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `col_tris.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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:14:20
[INFO] [stderr]    |
[INFO] [stderr] 14 |     visited.insert(pos.clone());
[INFO] [stderr]    |                    ^^^^^^^^^^^ help: try removing the `clone` call: `pos`
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:24:23
[INFO] [stderr]    |
[INFO] [stderr] 24 |             let dir = dirs[dir_index].clone();
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `dirs[dir_index]`
[INFO] [stderr]    |
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/bin/day1.rs:37:36
[INFO] [stderr]    |
[INFO] [stderr] 37 |                     visited.insert(pos.clone());
[INFO] [stderr]    |                                    ^^^^^^^^^^^ help: try removing the `clone` call: `pos`
[INFO] [stderr]    |
[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: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/bin/day2.rs:21:21
[INFO] [stderr]    |
[INFO] [stderr] 21 |                 let ref keypad = keypads[keypad_ind];
[INFO] [stderr]    |                 ----^^^^^^^^^^----------------------- help: try: `let keypad = &keypads[keypad_ind];`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/bin/day2.rs:41:17
[INFO] [stderr]    |
[INFO] [stderr] 41 |             let ref keypad = keypads[keypad_ind];
[INFO] [stderr]    |             ----^^^^^^^^^^----------------------- help: try: `let keypad = &keypads[keypad_ind];`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `keypad_ind` is used to index `codes`
[INFO] [stderr]   --> src/bin/day2.rs:45:23
[INFO] [stderr]    |
[INFO] [stderr] 45 |     for keypad_ind in 0..2 {
[INFO] [stderr]    |                       ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 45 |     for (keypad_ind, <item>) in codes.iter().enumerate().take(2) {
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/day4.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     return checksum == get_checksum(room)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `checksum == get_checksum(room)`
[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: casting character literal to u8. `char`s are 4 bytes wide in rust, so casting to u8 truncates them
[INFO] [stderr]   --> src/bin/day4.rs:58:16
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let base = 'a' as u8;
[INFO] [stderr]    |                ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::char_lit_as_u8)] on by default
[INFO] [stderr]    = help: Consider using a byte literal instead:
[INFO] [stderr]            b'a'
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/day7.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     return false;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[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 looks like you are swapping `self.pixels[row][next]` and `prev` manually
[INFO] [stderr]   --> src/bin/day8.rs:33:17
[INFO] [stderr]    |
[INFO] [stderr] 33 | /                 let tmp = self.pixels[row][next];
[INFO] [stderr] 34 | |                 self.pixels[row][next] = prev;
[INFO] [stderr] 35 | |                 prev = tmp;
[INFO] [stderr]    | |__________________________^ help: try: `std::mem::swap(&mut self.pixels[row][next], &mut prev)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]    = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `self.pixels[next][col]` and `prev` manually
[INFO] [stderr]   --> src/bin/day8.rs:52:17
[INFO] [stderr]    |
[INFO] [stderr] 52 | /                 let tmp = self.pixels[next][col];
[INFO] [stderr] 53 | |                 self.pixels[next][col] = prev;
[INFO] [stderr] 54 | |                 prev = tmp;
[INFO] [stderr]    | |__________________________^ help: try: `std::mem::swap(&mut self.pixels[next][col], &mut prev)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `self.pixels[row][next]` and `prev` manually
[INFO] [stderr]   --> src/bin/day8.rs:33:17
[INFO] [stderr]    |
[INFO] [stderr] 33 | /                 let tmp = self.pixels[row][next];
[INFO] [stderr] 34 | |                 self.pixels[row][next] = prev;
[INFO] [stderr] 35 | |                 prev = tmp;
[INFO] [stderr]    | |__________________________^ help: try: `std::mem::swap(&mut self.pixels[row][next], &mut prev)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]    = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `self.pixels[next][col]` and `prev` manually
[INFO] [stderr]   --> src/bin/day8.rs:52:17
[INFO] [stderr]    |
[INFO] [stderr] 52 | /                 let tmp = self.pixels[next][col];
[INFO] [stderr] 53 | |                 self.pixels[next][col] = prev;
[INFO] [stderr] 54 | |                 prev = tmp;
[INFO] [stderr]    | |__________________________^ help: try: `std::mem::swap(&mut self.pixels[next][col], &mut prev)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.00s
[INFO] running `"docker" "inspect" "767a5077ad4391a82cbd8aaaec9030fc12a8a357b408462584b66b8b5ccf72b8"`
[INFO] running `"docker" "rm" "-f" "767a5077ad4391a82cbd8aaaec9030fc12a8a357b408462584b66b8b5ccf72b8"`
[INFO] [stdout] 767a5077ad4391a82cbd8aaaec9030fc12a8a357b408462584b66b8b5ccf72b8