[INFO] crate lars 0.2.4 is already in cache
[INFO] extracting crate lars 0.2.4 into work/ex/clippy-test-run/sources/stable/reg/lars/0.2.4
[INFO] extracting crate lars 0.2.4 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/lars/0.2.4
[INFO] validating manifest of lars-0.2.4 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 lars-0.2.4 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 lars-0.2.4
[INFO] finished frobbing lars-0.2.4
[INFO] frobbed toml for lars-0.2.4 written to work/ex/clippy-test-run/sources/stable/reg/lars/0.2.4/Cargo.toml
[INFO] started frobbing lars-0.2.4
[INFO] finished frobbing lars-0.2.4
[INFO] frobbed toml for lars-0.2.4 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/lars/0.2.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 lars-0.2.4 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/lars/0.2.4:/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] 0b44f03e6f087113cf2779e8f1292ef1c5228c8ce23afc9a183e3794b6ebbdff
[INFO] running `"docker" "start" "-a" "0b44f03e6f087113cf2779e8f1292ef1c5228c8ce23afc9a183e3794b6ebbdff"`
[INFO] [stderr]     Checking lars v0.2.4 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:408:13
[INFO] [stderr]     |
[INFO] [stderr] 408 |             rows: rows,
[INFO] [stderr]     |             ^^^^^^^^^^ help: replace it with: `rows`
[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/matrix.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             cols: cols,
[INFO] [stderr]     |             ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:474:9
[INFO] [stderr]     |
[INFO] [stderr] 474 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:475:9
[INFO] [stderr]     |
[INFO] [stderr] 475 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:498:9
[INFO] [stderr]     |
[INFO] [stderr] 498 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:499:9
[INFO] [stderr]     |
[INFO] [stderr] 499 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:506:9
[INFO] [stderr]     |
[INFO] [stderr] 506 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:507:9
[INFO] [stderr]     |
[INFO] [stderr] 507 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:408:13
[INFO] [stderr]     |
[INFO] [stderr] 408 |             rows: rows,
[INFO] [stderr]     |             ^^^^^^^^^^ help: replace it with: `rows`
[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/matrix.rs:409:13
[INFO] [stderr]     |
[INFO] [stderr] 409 |             cols: cols,
[INFO] [stderr]     |             ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:474:9
[INFO] [stderr]     |
[INFO] [stderr] 474 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:475:9
[INFO] [stderr]     |
[INFO] [stderr] 475 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:498:9
[INFO] [stderr]     |
[INFO] [stderr] 498 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:499:9
[INFO] [stderr]     |
[INFO] [stderr] 499 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:506:9
[INFO] [stderr]     |
[INFO] [stderr] 506 |         rows: rows,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `rows`
[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: redundant field names in struct initialization
[INFO] [stderr]    --> src/matrix.rs:507:9
[INFO] [stderr]     |
[INFO] [stderr] 507 |         cols: cols,
[INFO] [stderr]     |         ^^^^^^^^^^ help: replace it with: `cols`
[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: casting f32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i16 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i8 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u16 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u8 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/vector.rs:98:5
[INFO] [stderr]     |
[INFO] [stderr] 98  | /     fn index<'a>(&'a self, index: usize) -> &'a T {
[INFO] [stderr] 99  | |         &self.content[index]
[INFO] [stderr] 100 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_lifetimes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/vector.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 105 | /     fn index_mut<'a>(&'a mut self, index: usize) -> &'a mut T {
[INFO] [stderr] 106 | |         &mut self.content[index]
[INFO] [stderr] 107 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: casting f32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i16 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:35:9
[INFO] [stderr]    |
[INFO] [stderr] 35 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i8 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u16 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:59:9
[INFO] [stderr]    |
[INFO] [stderr] 59 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u8 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         (*self as f64).powf(pow)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: try: `f64::from(*self)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/vector.rs:98:5
[INFO] [stderr]     |
[INFO] [stderr] 98  | /     fn index<'a>(&'a self, index: usize) -> &'a T {
[INFO] [stderr] 99  | |         &self.content[index]
[INFO] [stderr] 100 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::needless_lifetimes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/vector.rs:105:5
[INFO] [stderr]     |
[INFO] [stderr] 105 | /     fn index_mut<'a>(&'a mut self, index: usize) -> &'a mut T {
[INFO] [stderr] 106 | |         &mut self.content[index]
[INFO] [stderr] 107 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: item `vector::Vector<T>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/vector.rs:341:1
[INFO] [stderr]     |
[INFO] [stderr] 341 | / impl<T: Number> Vector<T> {
[INFO] [stderr] 342 | |     #[inline]
[INFO] [stderr] 343 | |     pub fn len(&self) -> usize {
[INFO] [stderr] 344 | |         self.content.len()
[INFO] [stderr] ...   |
[INFO] [stderr] 358 | |     }
[INFO] [stderr] 359 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/matrix.rs:130:5
[INFO] [stderr]     |
[INFO] [stderr] 130 | /     fn index<'a>(&'a self, index: usize) -> &'a [T] {
[INFO] [stderr] 131 | |         &self.content.content[self.rows * index .. self.rows * index + self.cols]
[INFO] [stderr] 132 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: item `vector::Vector<T>` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/vector.rs:341:1
[INFO] [stderr]     |
[INFO] [stderr] 341 | / impl<T: Number> Vector<T> {
[INFO] [stderr] 342 | |     #[inline]
[INFO] [stderr] 343 | |     pub fn len(&self) -> usize {
[INFO] [stderr] 344 | |         self.content.len()
[INFO] [stderr] ...   |
[INFO] [stderr] 358 | |     }
[INFO] [stderr] 359 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
[INFO] [stderr]    --> src/matrix.rs:130:5
[INFO] [stderr]     |
[INFO] [stderr] 130 | /     fn index<'a>(&'a self, index: usize) -> &'a [T] {
[INFO] [stderr] 131 | |         &self.content.content[self.rows * index .. self.rows * index + self.cols]
[INFO] [stderr] 132 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/matrix.rs:428:9
[INFO] [stderr]     |
[INFO] [stderr] 428 |         self.cols.clone()
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `self.cols`
[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/matrix.rs:432:9
[INFO] [stderr]     |
[INFO] [stderr] 432 |         self.rows.clone()
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `self.rows`
[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/matrix.rs:428:9
[INFO] [stderr]     |
[INFO] [stderr] 428 |         self.cols.clone()
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `self.cols`
[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/matrix.rs:432:9
[INFO] [stderr]     |
[INFO] [stderr] 432 |         self.rows.clone()
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `self.rows`
[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]     Finished dev [unoptimized + debuginfo] target(s) in 2.29s
[INFO] running `"docker" "inspect" "0b44f03e6f087113cf2779e8f1292ef1c5228c8ce23afc9a183e3794b6ebbdff"`
[INFO] running `"docker" "rm" "-f" "0b44f03e6f087113cf2779e8f1292ef1c5228c8ce23afc9a183e3794b6ebbdff"`
[INFO] [stdout] 0b44f03e6f087113cf2779e8f1292ef1c5228c8ce23afc9a183e3794b6ebbdff