[INFO] crate sensehat-screen 0.2.2 is already in cache
[INFO] extracting crate sensehat-screen 0.2.2 into work/ex/clippy-test-run/sources/stable/reg/sensehat-screen/0.2.2
[INFO] extracting crate sensehat-screen 0.2.2 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/sensehat-screen/0.2.2
[INFO] validating manifest of sensehat-screen-0.2.2 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 sensehat-screen-0.2.2 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 sensehat-screen-0.2.2
[INFO] finished frobbing sensehat-screen-0.2.2
[INFO] frobbed toml for sensehat-screen-0.2.2 written to work/ex/clippy-test-run/sources/stable/reg/sensehat-screen/0.2.2/Cargo.toml
[INFO] started frobbing sensehat-screen-0.2.2
[INFO] finished frobbing sensehat-screen-0.2.2
[INFO] frobbed toml for sensehat-screen-0.2.2 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/sensehat-screen/0.2.2/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 sensehat-screen-0.2.2 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/sensehat-screen/0.2.2:/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] df47f411151c61a95fc7f8fe6ddcee003733e18d128d50316dc0160af3e53879
[INFO] running `"docker" "start" "-a" "df47f411151c61a95fc7f8fe6ddcee003733e18d128d50316dc0160af3e53879"`
[INFO] [stderr]     Checking font8x8 v0.2.4
[INFO] [stderr]     Checking memmap v0.5.2
[INFO] [stderr]    Compiling sensehat-screen v0.2.2 (/opt/crater/workdir)
[INFO] [stderr]     Checking framebuffer v0.1.7
[INFO] [stderr] warning: lint name `len_without_is_empty` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
[INFO] [stderr]    --> src/scroll.rs:107:48
[INFO] [stderr]     |
[INFO] [stderr] 107 |     #[cfg_attr(feature = "cargo-clippy", allow(len_without_is_empty))]
[INFO] [stderr]     |                                                ^^^^^^^^^^^^^^^^^^^^ help: change it to: `clippy::len_without_is_empty`
[INFO] [stderr] 
[INFO] [stderr] warning: lint name `len_without_is_empty` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
[INFO] [stderr]    --> src/scroll.rs:107:48
[INFO] [stderr]     |
[INFO] [stderr] 107 |     #[cfg_attr(feature = "cargo-clippy", allow(len_without_is_empty))]
[INFO] [stderr]     |                                                ^^^^^^^^^^^^^^^^^^^^ help: change it to: `clippy::len_without_is_empty`
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/color.rs:101:19
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub fn rgb565(&self) -> [u8; 2] {
[INFO] [stderr]     |                   ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:207:36
[INFO] [stderr]     |
[INFO] [stderr] 207 |         for (row_idx, row) in rows.into_iter().enumerate() {
[INFO] [stderr]     |                                    ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::into_iter_on_array)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:208:39
[INFO] [stderr]     |
[INFO] [stderr] 208 |             for (col_idx, &px) in row.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:218:39
[INFO] [stderr]     |
[INFO] [stderr] 218 |         for (col_idx, col) in columns.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:219:39
[INFO] [stderr]     |
[INFO] [stderr] 219 |             for (row_idx, &px) in col.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:172:46
[INFO] [stderr]     |
[INFO] [stderr] 172 | fn font_to_pixel_color_array_with_bg(symbol: &[u8; 8],
[INFO] [stderr]     |                                              ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:188:38
[INFO] [stderr]     |
[INFO] [stderr] 188 | fn font_to_pixel_color_array(symbol: &[u8; 8], color: PixelColor) -> [PixelColor; 64] {
[INFO] [stderr]     |                                      ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:193:36
[INFO] [stderr]     |
[INFO] [stderr] 193 | pub fn font_to_pixel_frame(symbol: &[u8; 8], color: PixelColor) -> PixelFrame {
[INFO] [stderr]     |                                    ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:199:30
[INFO] [stderr]     |
[INFO] [stderr] 199 | pub fn font_to_frame(symbol: &[u8; 8], color: PixelColor) -> FrameLine {
[INFO] [stderr]     |                              ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: item `scroll::Scroll` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/scroll.rs:74:1
[INFO] [stderr]     |
[INFO] [stderr] 74  | / impl Scroll {
[INFO] [stderr] 75  | |     /// Creates a new scroll from a slice of `PixelFrame`s.
[INFO] [stderr] 76  | |     ///
[INFO] [stderr] 77  | |     /// # Panics
[INFO] [stderr] ...   |
[INFO] [stderr] 130 | |     }
[INFO] [stderr] 131 | | }
[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] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `sensehat-screen`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/color.rs:101:19
[INFO] [stderr]     |
[INFO] [stderr] 101 |     pub fn rgb565(&self) -> [u8; 2] {
[INFO] [stderr]     |                   ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:207:36
[INFO] [stderr]     |
[INFO] [stderr] 207 |         for (row_idx, row) in rows.into_iter().enumerate() {
[INFO] [stderr]     |                                    ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::into_iter_on_array)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:208:39
[INFO] [stderr]     |
[INFO] [stderr] 208 |             for (col_idx, &px) in row.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:218:39
[INFO] [stderr]     |
[INFO] [stderr] 218 |         for (col_idx, col) in columns.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] error: this .into_iter() call is equivalent to .iter() and will not move the array
[INFO] [stderr]    --> src/frame.rs:219:39
[INFO] [stderr]     |
[INFO] [stderr] 219 |             for (row_idx, &px) in col.into_iter().enumerate() {
[INFO] [stderr]     |                                       ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_array
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/frame.rs:413:20
[INFO] [stderr]     |
[INFO] [stderr] 413 |                   .into_iter()
[INFO] [stderr]     |                    ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/frame.rs:414:30
[INFO] [stderr]     |
[INFO] [stderr] 414 |                   .zip(color.into_iter())
[INFO] [stderr]     |                              ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/frame.rs:445:21
[INFO] [stderr]     |
[INFO] [stderr] 445 |                    .into_iter()
[INFO] [stderr]     |                     ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/frame.rs:446:37
[INFO] [stderr]     |
[INFO] [stderr] 446 |                    .zip(color_frame.into_iter())
[INFO] [stderr]     |                                     ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:172:46
[INFO] [stderr]     |
[INFO] [stderr] 172 | fn font_to_pixel_color_array_with_bg(symbol: &[u8; 8],
[INFO] [stderr]     |                                              ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:188:38
[INFO] [stderr]     |
[INFO] [stderr] 188 | fn font_to_pixel_color_array(symbol: &[u8; 8], color: PixelColor) -> [PixelColor; 64] {
[INFO] [stderr]     |                                      ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:193:36
[INFO] [stderr]     |
[INFO] [stderr] 193 | pub fn font_to_pixel_frame(symbol: &[u8; 8], color: PixelColor) -> PixelFrame {
[INFO] [stderr]     |                                    ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/fonts.rs:199:30
[INFO] [stderr]     |
[INFO] [stderr] 199 | pub fn font_to_frame(symbol: &[u8; 8], color: PixelColor) -> FrameLine {
[INFO] [stderr]     |                              ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/fonts.rs:338:35
[INFO] [stderr]     |
[INFO] [stderr] 338 |         for (idx, px) in px_array.into_iter().enumerate() {
[INFO] [stderr]     |                                   ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the slice
[INFO] [stderr]    --> src/fonts.rs:348:35
[INFO] [stderr]     |
[INFO] [stderr] 348 |         for (idx, px) in px_array.into_iter().enumerate() {
[INFO] [stderr]     |                                   ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/fonts.rs:373:41
[INFO] [stderr]     |
[INFO] [stderr] 373 |         let font_frame = FontFrame::new(letter_a.clone(), PixelColor::WHITE, PixelColor::BLACK);
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^ help: try dereferencing it: `*letter_a`
[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/fonts.rs:384:41
[INFO] [stderr]     |
[INFO] [stderr] 384 |         let font_frame = FontFrame::new(hiragana_font.clone(), PixelColor::RED, PixelColor::BLACK);
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*hiragana_font`
[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/fonts.rs:393:41
[INFO] [stderr]     |
[INFO] [stderr] 393 |         let font_frame = FontFrame::new(hiragana_font.clone(), PixelColor::RED, PixelColor::BLACK);
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*hiragana_font`
[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/fonts.rs:402:45
[INFO] [stderr]     |
[INFO] [stderr] 402 |         let mut font_frame = FontFrame::new(letter_a.clone(), PixelColor::WHITE, PixelColor::BLACK);
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^ help: try dereferencing it: `*letter_a`
[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/fonts.rs:414:41
[INFO] [stderr]     |
[INFO] [stderr] 414 |         let font_frame = FontFrame::new(letter_a.clone(), PixelColor::WHITE, PixelColor::GREEN);
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^ help: try dereferencing it: `*letter_a`
[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/fonts.rs:422:45
[INFO] [stderr]     |
[INFO] [stderr] 422 |         let mut font_frame = FontFrame::new(letter_a.clone(), PixelColor::WHITE, PixelColor::BLACK);
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^ help: try dereferencing it: `*letter_a`
[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/fonts.rs:434:41
[INFO] [stderr]     |
[INFO] [stderr] 434 |         let font_frame = FontFrame::new(letter_a.clone(), PixelColor::BLUE, PixelColor::WHITE);
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^^^ help: try dereferencing it: `*letter_a`
[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: item `scroll::Scroll` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]    --> src/scroll.rs:74:1
[INFO] [stderr]     |
[INFO] [stderr] 74  | / impl Scroll {
[INFO] [stderr] 75  | |     /// Creates a new scroll from a slice of `PixelFrame`s.
[INFO] [stderr] 76  | |     ///
[INFO] [stderr] 77  | |     /// # Panics
[INFO] [stderr] ...   |
[INFO] [stderr] 130 | |     }
[INFO] [stderr] 131 | | }
[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] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `sensehat-screen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "df47f411151c61a95fc7f8fe6ddcee003733e18d128d50316dc0160af3e53879"`
[INFO] running `"docker" "rm" "-f" "df47f411151c61a95fc7f8fe6ddcee003733e18d128d50316dc0160af3e53879"`
[INFO] [stdout] df47f411151c61a95fc7f8fe6ddcee003733e18d128d50316dc0160af3e53879