[INFO] updating cached repository aleozlx/la-tutorial
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aleozlx/la-tutorial
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aleozlx/la-tutorial" "work/ex/clippy-test-run/sources/stable/gh/aleozlx/la-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/aleozlx/la-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aleozlx/la-tutorial" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleozlx/la-tutorial"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleozlx/la-tutorial'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 24e0dd0f732059a65725fd85e9d5522291750bd8
[INFO] sha for GitHub repo aleozlx/la-tutorial: 24e0dd0f732059a65725fd85e9d5522291750bd8
[INFO] validating manifest of aleozlx/la-tutorial 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 aleozlx/la-tutorial 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 aleozlx/la-tutorial
[INFO] finished frobbing aleozlx/la-tutorial
[INFO] frobbed toml for aleozlx/la-tutorial written to work/ex/clippy-test-run/sources/stable/gh/aleozlx/la-tutorial/Cargo.toml
[INFO] started frobbing aleozlx/la-tutorial
[INFO] finished frobbing aleozlx/la-tutorial
[INFO] frobbed toml for aleozlx/la-tutorial written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleozlx/la-tutorial/Cargo.toml
[INFO] crate aleozlx/la-tutorial 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 aleozlx/la-tutorial against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-2/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/aleozlx/la-tutorial:/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] 09635d667891662a00189ed08412f947e3515540c497de48eaf0ae024a0dedc8
[INFO] running `"docker" "start" "-a" "09635d667891662a00189ed08412f947e3515540c497de48eaf0ae024a0dedc8"`
[INFO] [stderr]     Checking la-tutorial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |         return ret;
[INFO] [stderr]    |         ^^^^^^^^^^^ help: remove `return` as shown: `ret`
[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: unneeded return statement
[INFO] [stderr]    --> src/main.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         return s;
[INFO] [stderr]     |         ^^^^^^^^^ help: remove `return` as shown: `s`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:139:9
[INFO] [stderr]     |
[INFO] [stderr] 139 |         return transpose;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `transpose`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:47:9
[INFO] [stderr]    |
[INFO] [stderr] 47 |         return ret;
[INFO] [stderr]    |         ^^^^^^^^^^^ help: remove `return` as shown: `ret`
[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: unneeded return statement
[INFO] [stderr]    --> src/main.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         return s;
[INFO] [stderr]     |         ^^^^^^^^^ help: remove `return` as shown: `s`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:139:9
[INFO] [stderr]     |
[INFO] [stderr] 139 |         return transpose;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `transpose`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `transpose`
[INFO] [stderr]    --> src/main.rs:130:5
[INFO] [stderr]     |
[INFO] [stderr] 130 |     fn transpose(&self) -> Matrix {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `linear_regression`
[INFO] [stderr]    --> src/main.rs:142:5
[INFO] [stderr]     |
[INFO] [stderr] 142 |     fn linear_regression(&self, y: &Vec<f32>, theta: &mut Vec<f32>){
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `p` is only used to index `out_view`.
[INFO] [stderr]   --> src/main.rs:59:18
[INFO] [stderr]    |
[INFO] [stderr] 59 |         for p in 0..n {
[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] 59 |         for <item> in out_view.iter_mut().take(n) {
[INFO] [stderr]    |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `k` is used to index `s_view`
[INFO] [stderr]   --> src/main.rs:63:18
[INFO] [stderr]    |
[INFO] [stderr] 63 |         for k in 0..a.cols {
[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] 63 |         for (k, <item>) in s_view.iter().enumerate().take(a.cols) {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `transpose`
[INFO] [stderr]    --> src/main.rs:130:5
[INFO] [stderr]     |
[INFO] [stderr] 130 |     fn transpose(&self) -> Matrix {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `linear_regression`
[INFO] [stderr]    --> src/main.rs:142:5
[INFO] [stderr]     |
[INFO] [stderr] 142 |     fn linear_regression(&self, y: &Vec<f32>, theta: &mut Vec<f32>){
[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:107:24
[INFO] [stderr]     |
[INFO] [stderr] 107 |     fn solve(&self, b: &Vec<f32>, x: &mut Vec<f32>){
[INFO] [stderr]     |                        ^^^^^^^^^ help: change this to: `&[f32]`
[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: the loop variable `i` is used to index `b`
[INFO] [stderr]    --> src/main.rs:110:18
[INFO] [stderr]     |
[INFO] [stderr] 110 |         for i in 0..aug.rows {
[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] 110 |         for (i, <item>) in b.iter().enumerate().take(aug.rows) {
[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:142:36
[INFO] [stderr]     |
[INFO] [stderr] 142 |     fn linear_regression(&self, y: &Vec<f32>, theta: &mut Vec<f32>){
[INFO] [stderr]     |                                    ^^^^^^^^^ help: change this to: `&[f32]`
[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 `p` is only used to index `out_view`.
[INFO] [stderr]   --> src/main.rs:59:18
[INFO] [stderr]    |
[INFO] [stderr] 59 |         for p in 0..n {
[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] 59 |         for <item> in out_view.iter_mut().take(n) {
[INFO] [stderr]    |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `k` is used to index `s_view`
[INFO] [stderr]   --> src/main.rs:63:18
[INFO] [stderr]    |
[INFO] [stderr] 63 |         for k in 0..a.cols {
[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] 63 |         for (k, <item>) in s_view.iter().enumerate().take(a.cols) {
[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:107:24
[INFO] [stderr]     |
[INFO] [stderr] 107 |     fn solve(&self, b: &Vec<f32>, x: &mut Vec<f32>){
[INFO] [stderr]     |                        ^^^^^^^^^ help: change this to: `&[f32]`
[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: the loop variable `i` is used to index `b`
[INFO] [stderr]    --> src/main.rs:110:18
[INFO] [stderr]     |
[INFO] [stderr] 110 |         for i in 0..aug.rows {
[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] 110 |         for (i, <item>) in b.iter().enumerate().take(aug.rows) {
[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:142:36
[INFO] [stderr]     |
[INFO] [stderr] 142 |     fn linear_regression(&self, y: &Vec<f32>, theta: &mut Vec<f32>){
[INFO] [stderr]     |                                    ^^^^^^^^^ help: change this to: `&[f32]`
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `"docker" "inspect" "09635d667891662a00189ed08412f947e3515540c497de48eaf0ae024a0dedc8"`
[INFO] running `"docker" "rm" "-f" "09635d667891662a00189ed08412f947e3515540c497de48eaf0ae024a0dedc8"`
[INFO] [stdout] 09635d667891662a00189ed08412f947e3515540c497de48eaf0ae024a0dedc8