[INFO] updating cached repository MattsPoche/Matrix-transformation
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MattsPoche/Matrix-transformation
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MattsPoche/Matrix-transformation" "work/ex/clippy-test-run/sources/stable/gh/MattsPoche/Matrix-transformation"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/MattsPoche/Matrix-transformation'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MattsPoche/Matrix-transformation" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/MattsPoche/Matrix-transformation"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/MattsPoche/Matrix-transformation'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3643ab1e3986ac405588e77203f451f9bf186b11
[INFO] sha for GitHub repo MattsPoche/Matrix-transformation: 3643ab1e3986ac405588e77203f451f9bf186b11
[INFO] validating manifest of MattsPoche/Matrix-transformation 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 MattsPoche/Matrix-transformation 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 MattsPoche/Matrix-transformation
[INFO] finished frobbing MattsPoche/Matrix-transformation
[INFO] frobbed toml for MattsPoche/Matrix-transformation written to work/ex/clippy-test-run/sources/stable/gh/MattsPoche/Matrix-transformation/Cargo.toml
[INFO] started frobbing MattsPoche/Matrix-transformation
[INFO] finished frobbing MattsPoche/Matrix-transformation
[INFO] frobbed toml for MattsPoche/Matrix-transformation written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/MattsPoche/Matrix-transformation/Cargo.toml
[INFO] crate MattsPoche/Matrix-transformation 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 MattsPoche/Matrix-transformation 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-2/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/MattsPoche/Matrix-transformation:/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] 95877374ea6bebd3d93ac178cf1c84e54678df6129522cef5828d19995f6ab3c
[INFO] running `"docker" "start" "-a" "95877374ea6bebd3d93ac178cf1c84e54678df6129522cef5828d19995f6ab3c"`
[INFO] [stderr]     Checking matrix_transformation v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         print!("\n");
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::print_with_newline)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |         print!("\n");
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:99:5
[INFO] [stderr]    |
[INFO] [stderr] 99 |     print!("\n");
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/main.rs:101:5
[INFO] [stderr]     |
[INFO] [stderr] 101 |     print!("\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/main.rs:103:5
[INFO] [stderr]     |
[INFO] [stderr] 103 |     print!("\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         print!("\n");
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::print_with_newline)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:74:9
[INFO] [stderr]    |
[INFO] [stderr] 74 |         print!("\n");
[INFO] [stderr]    |         ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]   --> src/main.rs:99:5
[INFO] [stderr]    |
[INFO] [stderr] 99 |     print!("\n");
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/main.rs:101:5
[INFO] [stderr]     |
[INFO] [stderr] 101 |     print!("\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: using `print!()` with a format string that ends in a single newline, consider using `println!()` instead
[INFO] [stderr]    --> src/main.rs:103:5
[INFO] [stderr]     |
[INFO] [stderr] 103 |     print!("\n");
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y_ubound`
[INFO] [stderr]  --> src/main.rs:3:20
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let (x_ubound, y_ubound) = get_bounds(v);
[INFO] [stderr]   |                    ^^^^^^^^ help: consider using `_y_ubound` instead
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `matricize`
[INFO] [stderr]   --> src/main.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn matricize(v: &Vec<(usize, usize)>) -> Vec<Vec<u16>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_matrix`
[INFO] [stderr]   --> src/main.rs:69:1
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn print_matrix(m: &Vec<Vec<u16>>) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]  --> src/main.rs:1:18
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn rot_matrix(v: &Vec<(usize, usize)>) -> Vec<(usize, usize)> {
[INFO] [stderr]   |                  ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:15:18
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn get_bounds(v: &Vec<(usize, usize)>) -> (usize, usize) {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:32:15
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn tuplize(m: &Vec<Vec<u16>>) -> Vec<(usize, usize)> {
[INFO] [stderr]    |               ^^^^^^^^^^^^^^ help: change this to: `&[Vec<u16>]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `y` is used to index `m`
[INFO] [stderr]   --> src/main.rs:34:14
[INFO] [stderr]    |
[INFO] [stderr] 34 |     for y in 0..m.len() {
[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] 34 |     for (y, <item>) in m.iter().enumerate() {
[INFO] [stderr]    |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:44:17
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn matricize(v: &Vec<(usize, usize)>) -> Vec<Vec<u16>> {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:54:17
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn print_vec(v: &Vec<(usize, usize)>) {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]   --> src/main.rs:57:14
[INFO] [stderr]    |
[INFO] [stderr] 57 |     for y in 0..y_ubound+1 {
[INFO] [stderr]    |              ^^^^^^^^^^^^^ help: use: `0..=y_ubound`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]   --> src/main.rs:58:18
[INFO] [stderr]    |
[INFO] [stderr] 58 |         for x in 0..x_ubound+1 {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^ help: use: `0..=x_ubound`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:69:20
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn print_matrix(m: &Vec<Vec<u16>>) {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^ help: change this to: `&[Vec<u16>]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `y` is only used to index `m`.
[INFO] [stderr]   --> src/main.rs:70:14
[INFO] [stderr]    |
[INFO] [stderr] 70 |     for y in 0..m.len() {
[INFO] [stderr]    |              ^^^^^^^^^^
[INFO] [stderr]    |
[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] 70 |     for <item> in &m {
[INFO] [stderr]    |         ^^^^^^    ^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y_ubound`
[INFO] [stderr]  --> src/main.rs:3:20
[INFO] [stderr]   |
[INFO] [stderr] 3 |     let (x_ubound, y_ubound) = get_bounds(v);
[INFO] [stderr]   |                    ^^^^^^^^ help: consider using `_y_ubound` instead
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]  --> src/main.rs:1:18
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn rot_matrix(v: &Vec<(usize, usize)>) -> Vec<(usize, usize)> {
[INFO] [stderr]   |                  ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:15:18
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn get_bounds(v: &Vec<(usize, usize)>) -> (usize, usize) {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:32:15
[INFO] [stderr]    |
[INFO] [stderr] 32 | fn tuplize(m: &Vec<Vec<u16>>) -> Vec<(usize, usize)> {
[INFO] [stderr]    |               ^^^^^^^^^^^^^^ help: change this to: `&[Vec<u16>]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `y` is used to index `m`
[INFO] [stderr]   --> src/main.rs:34:14
[INFO] [stderr]    |
[INFO] [stderr] 34 |     for y in 0..m.len() {
[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] 34 |     for (y, <item>) in m.iter().enumerate() {
[INFO] [stderr]    |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:44:17
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn matricize(v: &Vec<(usize, usize)>) -> Vec<Vec<u16>> {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:54:17
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn print_vec(v: &Vec<(usize, usize)>) {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^ help: change this to: `&[(usize, usize)]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]   --> src/main.rs:57:14
[INFO] [stderr]    |
[INFO] [stderr] 57 |     for y in 0..y_ubound+1 {
[INFO] [stderr]    |              ^^^^^^^^^^^^^ help: use: `0..=y_ubound`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]   --> src/main.rs:58:18
[INFO] [stderr]    |
[INFO] [stderr] 58 |         for x in 0..x_ubound+1 {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^ help: use: `0..=x_ubound`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/main.rs:69:20
[INFO] [stderr]    |
[INFO] [stderr] 69 | fn print_matrix(m: &Vec<Vec<u16>>) {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^ help: change this to: `&[Vec<u16>]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `y` is only used to index `m`.
[INFO] [stderr]   --> src/main.rs:70:14
[INFO] [stderr]    |
[INFO] [stderr] 70 |     for y in 0..m.len() {
[INFO] [stderr]    |              ^^^^^^^^^^
[INFO] [stderr]    |
[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] 70 |     for <item> in &m {
[INFO] [stderr]    |         ^^^^^^    ^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
[INFO] running `"docker" "inspect" "95877374ea6bebd3d93ac178cf1c84e54678df6129522cef5828d19995f6ab3c"`
[INFO] running `"docker" "rm" "-f" "95877374ea6bebd3d93ac178cf1c84e54678df6129522cef5828d19995f6ab3c"`
[INFO] [stdout] 95877374ea6bebd3d93ac178cf1c84e54678df6129522cef5828d19995f6ab3c