[INFO] crate png2aa 0.1.2 is already in cache
[INFO] extracting crate png2aa 0.1.2 into work/ex/clippy-test-run/sources/stable/reg/png2aa/0.1.2
[INFO] extracting crate png2aa 0.1.2 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/png2aa/0.1.2
[INFO] validating manifest of png2aa-0.1.2 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 png2aa-0.1.2 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 png2aa-0.1.2
[INFO] finished frobbing png2aa-0.1.2
[INFO] frobbed toml for png2aa-0.1.2 written to work/ex/clippy-test-run/sources/stable/reg/png2aa/0.1.2/Cargo.toml
[INFO] started frobbing png2aa-0.1.2
[INFO] finished frobbing png2aa-0.1.2
[INFO] frobbed toml for png2aa-0.1.2 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/png2aa/0.1.2/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 png2aa-0.1.2 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/png2aa/0.1.2:/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] 56ad959767fae54e2b3fca85a9b45d818d7d1cd4644e9bbd1614d43462ed05b4
[INFO] running `"docker" "start" "-a" "56ad959767fae54e2b3fca85a9b45d818d7d1cd4644e9bbd1614d43462ed05b4"`
[INFO] [stderr]    Compiling ndarray v0.10.14
[INFO] [stderr]     Checking string-error v0.1.0
[INFO] [stderr]     Checking png2aa v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/filter/line.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         horizontal_edge_filter: horizontal_edge_filter,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `horizontal_edge_filter`
[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/filter/line.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |         vertical_edge_filter: vertical_edge_filter
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `vertical_edge_filter`
[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/filter/hough.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |         Self { data: data, rho_offset: max_rho_i }
[INFO] [stderr]    |                ^^^^^^^^^^ help: replace it with: `data`
[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/filter/ascii_art.rs:12:17
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Character { rho: rho, theta: theta, string: string.to_string() }
[INFO] [stderr]    |                 ^^^^^^^^ help: replace it with: `rho`
[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/filter/ascii_art.rs:12:27
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Character { rho: rho, theta: theta, string: string.to_string() }
[INFO] [stderr]    |                           ^^^^^^^^^^^^ help: replace it with: `theta`
[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/filter/ascii_art.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         character_list: character_list
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `character_list`
[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/filter/shrink.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         filter: filter,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: replace it with: `filter`
[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/filter/line.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         horizontal_edge_filter: horizontal_edge_filter,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `horizontal_edge_filter`
[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/filter/line.rs:22:9
[INFO] [stderr]    |
[INFO] [stderr] 22 |         vertical_edge_filter: vertical_edge_filter
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `vertical_edge_filter`
[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/filter/hough.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |         Self { data: data, rho_offset: max_rho_i }
[INFO] [stderr]    |                ^^^^^^^^^^ help: replace it with: `data`
[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/filter/ascii_art.rs:12:17
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Character { rho: rho, theta: theta, string: string.to_string() }
[INFO] [stderr]    |                 ^^^^^^^^ help: replace it with: `rho`
[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/filter/ascii_art.rs:12:27
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Character { rho: rho, theta: theta, string: string.to_string() }
[INFO] [stderr]    |                           ^^^^^^^^^^^^ help: replace it with: `theta`
[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/filter/ascii_art.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         character_list: character_list
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `character_list`
[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/filter/shrink.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |         filter: filter,
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: replace it with: `filter`
[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: unused `#[macro_use]` import
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #[macro_use] extern crate ndarray;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/filter/line.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         return self.gradient_abs(img)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.gradient_abs(img)`
[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/filter/line.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |         return result;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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/filter/hough.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |         return maximum_rho_slopes;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `maximum_rho_slopes`
[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/filter/hough.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         return container;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `container`
[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/filter/hough.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         return (slope_i as f32 / self.theta_resolution as f32) * f32::consts::PI;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(slope_i as f32 / self.theta_resolution as f32) * f32::consts::PI`
[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/filter/hough.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         return rho
[INFO] [stderr]     |         ^^^^^^^^^^ help: remove `return` as shown: `rho`
[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/filter/ascii_art.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     return aaf;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `aaf`
[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/filter/ascii_art.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         return result;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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/filter/ascii_art.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |         return minimum_character_by_theta.string.clone();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `minimum_character_by_theta.string.clone()`
[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/utils.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     return result;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/filter/hough.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |         self.data.iter().max().unwrap().clone()
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*self.data.iter().max().unwrap()`
[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: casting i8 to f32 may become silently lossy if types change
[INFO] [stderr]   --> src/filter/shrink.rs:27:41
[INFO] [stderr]    |
[INFO] [stderr] 27 |         utils::convolve2d(&img.mapv(|e| e as f32), &self.filter).mapv(|e| if e > self.thresh { 1 } else { 0 })
[INFO] [stderr]    |                                         ^^^^^^^^ help: try: `f32::from(e)`
[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 u8 to f32 may become silently lossy if types change
[INFO] [stderr]   --> src/utils.rs:27:65
[INFO] [stderr]    |
[INFO] [stderr] 27 |             let arr = Array1::<f32>::from(v.into_iter().map(|e| e as f32).collect::<Vec<f32>>());
[INFO] [stderr]    |                                                                 ^^^^^^^^ help: try: `f32::from(e)`
[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: unused `#[macro_use]` import
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #[macro_use] extern crate ndarray;
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/filter/line.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         return self.gradient_abs(img)
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.gradient_abs(img)`
[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/filter/line.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |         return result;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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/filter/hough.rs:72:9
[INFO] [stderr]    |
[INFO] [stderr] 72 |         return maximum_rho_slopes;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `maximum_rho_slopes`
[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/filter/hough.rs:95:9
[INFO] [stderr]    |
[INFO] [stderr] 95 |         return container;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `container`
[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/filter/hough.rs:99:9
[INFO] [stderr]    |
[INFO] [stderr] 99 |         return (slope_i as f32 / self.theta_resolution as f32) * f32::consts::PI;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(slope_i as f32 / self.theta_resolution as f32) * f32::consts::PI`
[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/filter/hough.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         return rho
[INFO] [stderr]     |         ^^^^^^^^^^ help: remove `return` as shown: `rho`
[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/filter/ascii_art.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     return aaf;
[INFO] [stderr]    |     ^^^^^^^^^^^ help: remove `return` as shown: `aaf`
[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/filter/ascii_art.rs:75:9
[INFO] [stderr]    |
[INFO] [stderr] 75 |         return result;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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/filter/ascii_art.rs:88:9
[INFO] [stderr]    |
[INFO] [stderr] 88 |         return minimum_character_by_theta.string.clone();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `minimum_character_by_theta.string.clone()`
[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/utils.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 |     return result;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `result`
[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: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/filter/hough.rs:43:9
[INFO] [stderr]    |
[INFO] [stderr] 43 |         self.data.iter().max().unwrap().clone()
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*self.data.iter().max().unwrap()`
[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: casting i8 to f32 may become silently lossy if types change
[INFO] [stderr]   --> src/filter/shrink.rs:27:41
[INFO] [stderr]    |
[INFO] [stderr] 27 |         utils::convolve2d(&img.mapv(|e| e as f32), &self.filter).mapv(|e| if e > self.thresh { 1 } else { 0 })
[INFO] [stderr]    |                                         ^^^^^^^^ help: try: `f32::from(e)`
[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 u8 to f32 may become silently lossy if types change
[INFO] [stderr]   --> src/utils.rs:27:65
[INFO] [stderr]    |
[INFO] [stderr] 27 |             let arr = Array1::<f32>::from(v.into_iter().map(|e| e as f32).collect::<Vec<f32>>());
[INFO] [stderr]    |                                                                 ^^^^^^^^ help: try: `f32::from(e)`
[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] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/cli.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `png2aa`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/cli.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `png2aa`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "56ad959767fae54e2b3fca85a9b45d818d7d1cd4644e9bbd1614d43462ed05b4"`
[INFO] running `"docker" "rm" "-f" "56ad959767fae54e2b3fca85a9b45d818d7d1cd4644e9bbd1614d43462ed05b4"`
[INFO] [stdout] 56ad959767fae54e2b3fca85a9b45d818d7d1cd4644e9bbd1614d43462ed05b4