[INFO] updating cached repository drojf/SpriteZip
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/drojf/SpriteZip
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/drojf/SpriteZip" "work/ex/clippy-test-run/sources/stable/gh/drojf/SpriteZip"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/drojf/SpriteZip'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/drojf/SpriteZip" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/drojf/SpriteZip"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/drojf/SpriteZip'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 463ee92e5218ebb20bf8e5cb07103863f1912b3e
[INFO] sha for GitHub repo drojf/SpriteZip: 463ee92e5218ebb20bf8e5cb07103863f1912b3e
[INFO] validating manifest of drojf/SpriteZip 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 drojf/SpriteZip 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 drojf/SpriteZip
[INFO] finished frobbing drojf/SpriteZip
[INFO] frobbed toml for drojf/SpriteZip written to work/ex/clippy-test-run/sources/stable/gh/drojf/SpriteZip/Cargo.toml
[INFO] started frobbing drojf/SpriteZip
[INFO] finished frobbing drojf/SpriteZip
[INFO] frobbed toml for drojf/SpriteZip written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/drojf/SpriteZip/Cargo.toml
[INFO] crate drojf/SpriteZip 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 drojf/SpriteZip 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/gh/drojf/SpriteZip:/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] 549854c53ad48f28cf5812829d1b3b6ab3df249866ad364ab4a74c23a42e2fc2
[INFO] running `"docker" "start" "-a" "549854c53ad48f28cf5812829d1b3b6ab3df249866ad364ab4a74c23a42e2fc2"`
[INFO] [stderr]     Checking alloc-no-stdlib v1.3.0
[INFO] [stderr]     Checking typed-arena v1.4.1
[INFO] [stderr]     Checking miniz_oxide v0.1.3
[INFO] [stderr]     Checking number_prefix v0.2.8
[INFO] [stderr]    Compiling syn v0.14.2
[INFO] [stderr]     Checking serde_json v1.0.20
[INFO] [stderr]     Checking bincode v1.0.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.14
[INFO] [stderr]     Checking zopfli v0.3.7
[INFO] [stderr]     Checking brotli-decompressor v1.3.1
[INFO] [stderr]    Compiling num-derive v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.66
[INFO] [stderr]     Checking brotli v2.5.0
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking oxipng v1.0.4
[INFO] [stderr]     Checking spritezip v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/common.rs:90:13
[INFO] [stderr]    |
[INFO] [stderr] 90 |             file_type : file_type,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `file_type`
[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: using `println!("")`
[INFO] [stderr]    --> src/compress.rs:210:13
[INFO] [stderr]     |
[INFO] [stderr] 210 |             println!("");
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/extract.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/common.rs:90:13
[INFO] [stderr]    |
[INFO] [stderr] 90 |             file_type : file_type,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `file_type`
[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: using `println!("")`
[INFO] [stderr]    --> src/compress.rs:210:13
[INFO] [stderr]     |
[INFO] [stderr] 210 |             println!("");
[INFO] [stderr]     |             ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/extract.rs:76:9
[INFO] [stderr]    |
[INFO] [stderr] 76 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/common.rs:188:5
[INFO] [stderr]     |
[INFO] [stderr] 188 |     return VerificationResult::ExactMatch;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `VerificationResult::ExactMatch`
[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/common.rs:193:5
[INFO] [stderr]     |
[INFO] [stderr] 193 |     return (value >> (which_byte * 8)) as u8;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(value >> (which_byte * 8)) as u8`
[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/common.rs:198:5
[INFO] [stderr]     |
[INFO] [stderr] 198 |     return (value as u64) << (which_byte * 8);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(value as u64) << (which_byte * 8)`
[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/common.rs:236:5
[INFO] [stderr]     |
[INFO] [stderr] 236 |     return u8_buf_to_u32_big_endian(&png_width_bytes);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `u8_buf_to_u32_big_endian(&png_width_bytes)`
[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/common.rs:323:5
[INFO] [stderr]     |
[INFO] [stderr] 323 |     return retvec;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `retvec`
[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/common.rs:341:5
[INFO] [stderr]     |
[INFO] [stderr] 341 |     return retvec;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `retvec`
[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/common.rs:467:5
[INFO] [stderr]     |
[INFO] [stderr] 467 |     return Some(*prev_image.get_pixel(prev_x as u32, prev_y as u32));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(*prev_image.get_pixel(prev_x as u32, prev_y as u32))`
[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/compress.rs:318:5
[INFO] [stderr]     |
[INFO] [stderr] 318 |     return crop_region
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `crop_region`
[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: unused import: `Write`
[INFO] [stderr]  --> src/extract.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{Read, Write, SeekFrom, Seek};
[INFO] [stderr]   |                     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::default::Default`
[INFO] [stderr]  --> src/extract.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::default::Default;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/common.rs:188:5
[INFO] [stderr]     |
[INFO] [stderr] 188 |     return VerificationResult::ExactMatch;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `VerificationResult::ExactMatch`
[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/common.rs:193:5
[INFO] [stderr]     |
[INFO] [stderr] 193 |     return (value >> (which_byte * 8)) as u8;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(value >> (which_byte * 8)) as u8`
[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/common.rs:198:5
[INFO] [stderr]     |
[INFO] [stderr] 198 |     return (value as u64) << (which_byte * 8);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(value as u64) << (which_byte * 8)`
[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/common.rs:236:5
[INFO] [stderr]     |
[INFO] [stderr] 236 |     return u8_buf_to_u32_big_endian(&png_width_bytes);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `u8_buf_to_u32_big_endian(&png_width_bytes)`
[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/common.rs:323:5
[INFO] [stderr]     |
[INFO] [stderr] 323 |     return retvec;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `retvec`
[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/common.rs:341:5
[INFO] [stderr]     |
[INFO] [stderr] 341 |     return retvec;
[INFO] [stderr]     |     ^^^^^^^^^^^^^^ help: remove `return` as shown: `retvec`
[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/common.rs:467:5
[INFO] [stderr]     |
[INFO] [stderr] 467 |     return Some(*prev_image.get_pixel(prev_x as u32, prev_y as u32));
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(*prev_image.get_pixel(prev_x as u32, prev_y as u32))`
[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/compress.rs:318:5
[INFO] [stderr]     |
[INFO] [stderr] 318 |     return crop_region
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `crop_region`
[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: unused import: `Write`
[INFO] [stderr]  --> src/extract.rs:4:21
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{Read, Write, SeekFrom, Seek};
[INFO] [stderr]   |                     ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::default::Default`
[INFO] [stderr]  --> src/extract.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::default::Default;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `img_count`
[INFO] [stderr]    --> src/common.rs:134:10
[INFO] [stderr]     |
[INFO] [stderr] 134 |     for (img_count, ent) in FileTypeIterator::new(input_folder, "png").enumerate()
[INFO] [stderr]     |          ^^^^^^^^^ help: consider using `_img_count` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `debug_difference_count` is assigned to, but never used
[INFO] [stderr]    --> src/compress.rs:290:13
[INFO] [stderr]     |
[INFO] [stderr] 290 |     let mut debug_difference_count = 0;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_debug_difference_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `u8_buf_to_u32_big_endian`
[INFO] [stderr]    --> src/common.rs:223:1
[INFO] [stderr]     |
[INFO] [stderr] 223 | pub fn u8_buf_to_u32_big_endian(buf : &[u8; 4]) -> u32
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `u8_stream_to_u32_big_endian`
[INFO] [stderr]    --> src/common.rs:232:1
[INFO] [stderr]     |
[INFO] [stderr] 232 | pub fn u8_stream_to_u32_big_endian(reader : &mut Read) -> u32
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_png_dimensions`
[INFO] [stderr]    --> src/common.rs:240:1
[INFO] [stderr]     |
[INFO] [stderr] 240 | pub fn get_png_dimensions(reader : &mut Read) -> Result<(u32, u32), &'static str>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `scan_folder_for_max_png_size`
[INFO] [stderr]    --> src/common.rs:264:1
[INFO] [stderr]     |
[INFO] [stderr] 264 | pub fn scan_folder_for_max_png_size(input_folder : &str) -> (u32, u32)
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save_image_no_alpha`
[INFO] [stderr]    --> src/common.rs:290:1
[INFO] [stderr]     |
[INFO] [stderr] 290 | pub fn save_image_no_alpha(mut image : RgbaImage, save_path : &str)
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compress_image_to_buffer`
[INFO] [stderr]    --> src/common.rs:309:1
[INFO] [stderr]     |
[INFO] [stderr] 309 | pub fn compress_image_to_buffer(img: &image::RgbaImage) -> Vec<u8>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compress_buffer`
[INFO] [stderr]    --> src/common.rs:327:1
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &Vec<u8>) -> Vec<u8>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `CroppedImageBounds`
[INFO] [stderr]   --> src/compress.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | struct CroppedImageBounds {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `crop_function`
[INFO] [stderr]   --> src/compress.rs:43:1
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn crop_function(img: &image::RgbaImage, offset : (u32, u32), max_width : u32, max_height : u32) -> (CroppedImageBounds, u64)
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:20:26
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let prev_x_offset = (prev_image.width() as i64 - original_image.width()  as i64)/2;
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.width())`
[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 u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:20:54
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let prev_x_offset = (prev_image.width() as i64 - original_image.width()  as i64)/2;
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image.width())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:21:25
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let prev_y_offset = prev_image.height() as i64 - original_image.height() as i64;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.height())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:21:54
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let prev_y_offset = prev_image.height() as i64 - original_image.height() as i64;
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image.height())`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:198:12
[INFO] [stderr]     |
[INFO] [stderr] 198 |     return (value as u64) << (which_byte * 8);
[INFO] [stderr]     |            ^^^^^^^^^^^^^^ help: try: `u64::from(value)`
[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: the loop variable `i` is used to index `buf`
[INFO] [stderr]    --> src/common.rs:204:14
[INFO] [stderr]     |
[INFO] [stderr] 204 |     for i in 0..8
[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] 204 |     for (i, <item>) in buf.iter_mut().enumerate()
[INFO] [stderr]     |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/common.rs:212:42
[INFO] [stderr]     |
[INFO] [stderr] 212 | pub fn u8_buf_to_u64_little_endian(buf : &[u8; 8]) -> u64
[INFO] [stderr]     |                                          ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[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] warning: the loop variable `i` is used to index `buf`
[INFO] [stderr]    --> src/common.rs:215:14
[INFO] [stderr]     |
[INFO] [stderr] 215 |     for i in 0..8
[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] 215 |     for (i, <item>) in buf.iter().enumerate().take(8)
[INFO] [stderr]     |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/common.rs:223:39
[INFO] [stderr]     |
[INFO] [stderr] 223 | pub fn u8_buf_to_u32_big_endian(buf : &[u8; 4]) -> u32
[INFO] [stderr]     |                                       ^^^^^^^^ help: consider passing by value instead: `[u8; 4]`
[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: casting u8 to u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:225:5
[INFO] [stderr]     |
[INFO] [stderr] 225 |     (buf[0] as u32) << 24 |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[0])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:226:5
[INFO] [stderr]     |
[INFO] [stderr] 226 |     (buf[1] as u32) << 16 |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[1])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     (buf[2] as u32) << 8  |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[2])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:228:5
[INFO] [stderr]     |
[INFO] [stderr] 228 |     (buf[3] as u32)
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[3])`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/common.rs:320:9
[INFO] [stderr]     |
[INFO] [stderr] 320 |         compressor.write(&imgclone.into_vec()).unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[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/common.rs:327:29
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &Vec<u8>) -> Vec<u8>
[INFO] [stderr]     |                             ^^^^^^^^
[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] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &[u8]) -> Vec<u8>
[INFO] [stderr]     |                             ^^^^^
[INFO] [stderr] help: change `img.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 330 |     let imgclone = img.to_owned();
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/common.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |         compressor.write(&imgclone).unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/common.rs:357:9
[INFO] [stderr]     |
[INFO] [stderr] 357 | /         let mut safe_i = 0;
[INFO] [stderr] 358 | |
[INFO] [stderr] 359 | |         // if dimensions given are 0,0, force dimensions to 1,1, then set i so that iterator
[INFO] [stderr] 360 | |         // will terminate immediately. This avoids a modulo (%) by zero error and does 0 iterations.
[INFO] [stderr] ...   |
[INFO] [stderr] 363 | |             safe_i = 2;
[INFO] [stderr] 364 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> safe_i = if dimensions.0 == 0 || dimensions.1 == 0 { ..; 2 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_let_if_seq)] on by default
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:463:46
[INFO] [stderr]     |
[INFO] [stderr] 463 |     if prev_x < 0 || prev_y < 0 || prev_x >= prev_image.width() as i64 || prev_y >= prev_image.height() as i64 {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.width())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:463:85
[INFO] [stderr]     |
[INFO] [stderr] 463 |     if prev_x < 0 || prev_y < 0 || prev_x >= prev_image.width() as i64 || prev_y >= prev_image.height() as i64 {
[INFO] [stderr]     |                                                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.height())`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     archive_file.write(&[0; FILE_FORMAT_HEADER_LENGTH]).expect("Unable to allocate header space in file");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:236:5
[INFO] [stderr]     |
[INFO] [stderr] 236 |     archive_file.write(&u64_to_u8_buf_little_endian(metadata_start)).expect("Unable to write header offset to file");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:265:22
[INFO] [stderr]     |
[INFO] [stderr] 265 |         let prev_x = x as i64 + x_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^ help: try: `i64::from(x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:266:22
[INFO] [stderr]     |
[INFO] [stderr] 266 |         let prev_y = y as i64 + y_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^ help: try: `i64::from(y)`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:281:70
[INFO] [stderr]     |
[INFO] [stderr] 281 |     print!("Diff: {} ", pretty_print_percent(debug_difference_count, original_image.width() as u64 * original_image.height() as u64));
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u64::from(original_image.width())`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:281:102
[INFO] [stderr]     |
[INFO] [stderr] 281 |     print!("Diff: {} ", pretty_print_percent(debug_difference_count, original_image.width() as u64 * original_image.height() as u64));
[INFO] [stderr]     |                                                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u64::from(original_image.height())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:297:22
[INFO] [stderr]     |
[INFO] [stderr] 297 |         let prev_x = original_image_x as i64 + x_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image_x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:298:22
[INFO] [stderr]     |
[INFO] [stderr] 298 |         let prev_y = original_image_y as i64 + y_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image_y)`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:311:13
[INFO] [stderr]     |
[INFO] [stderr] 311 |             image_compressor.write(&cropped_pixel.data).unwrap();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:315:5
[INFO] [stderr]     |
[INFO] [stderr] 315 |     bitmap_compressor.write(&difference).unwrap();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle read amount returned or use `Read::read_exact` instead
[INFO] [stderr]   --> src/extract.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     brotli_file.read(&mut header).expect("Unable to read brotli file header");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/extract.rs:95:38
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 match try_get_pixel((x as i64 + x_offset_to_prev_image, y as i64 + y_offset_to_prev_image), &prev_image) {
[INFO] [stderr]    |                                      ^^^^^^^^ help: try: `i64::from(x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/extract.rs:95:73
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 match try_get_pixel((x as i64 + x_offset_to_prev_image, y as i64 + y_offset_to_prev_image), &prev_image) {
[INFO] [stderr]    |                                                                         ^^^^^^^^ help: try: `i64::from(y)`
[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: the variable `pixel_count` is used as a loop counter. Consider using `for (pixel_count, item) in BlockXYIterator::new(50, (metadata.diff_width as usize, metadata.diff_height as usize)).enumerate()` or similar iterators
[INFO] [stderr]    --> src/extract.rs:104:22
[INFO] [stderr]     |
[INFO] [stderr] 104 |         for (x,y) in BlockXYIterator::new(50, (metadata.diff_width as usize, metadata.diff_height as usize)) {
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::explicit_counter_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]    --> src/extract.rs:130:25
[INFO] [stderr]     |
[INFO] [stderr] 130 |                     let ref mut w = std::io::BufWriter::new(&mut unoptimized_png_in_memory);
[INFO] [stderr]     |                     ----^^^^^^^^^----------------------------------------------------------- help: try: `let w = &mut std::io::BufWriter::new(&mut unoptimized_png_in_memory);`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 7 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `spritezip`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `img_count`
[INFO] [stderr]    --> src/common.rs:134:10
[INFO] [stderr]     |
[INFO] [stderr] 134 |     for (img_count, ent) in FileTypeIterator::new(input_folder, "png").enumerate()
[INFO] [stderr]     |          ^^^^^^^^^ help: consider using `_img_count` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `debug_difference_count` is assigned to, but never used
[INFO] [stderr]    --> src/compress.rs:290:13
[INFO] [stderr]     |
[INFO] [stderr] 290 |     let mut debug_difference_count = 0;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: consider using `_debug_difference_count` instead
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `u8_buf_to_u32_big_endian`
[INFO] [stderr]    --> src/common.rs:223:1
[INFO] [stderr]     |
[INFO] [stderr] 223 | pub fn u8_buf_to_u32_big_endian(buf : &[u8; 4]) -> u32
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `u8_stream_to_u32_big_endian`
[INFO] [stderr]    --> src/common.rs:232:1
[INFO] [stderr]     |
[INFO] [stderr] 232 | pub fn u8_stream_to_u32_big_endian(reader : &mut Read) -> u32
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_png_dimensions`
[INFO] [stderr]    --> src/common.rs:240:1
[INFO] [stderr]     |
[INFO] [stderr] 240 | pub fn get_png_dimensions(reader : &mut Read) -> Result<(u32, u32), &'static str>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `scan_folder_for_max_png_size`
[INFO] [stderr]    --> src/common.rs:264:1
[INFO] [stderr]     |
[INFO] [stderr] 264 | pub fn scan_folder_for_max_png_size(input_folder : &str) -> (u32, u32)
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `save_image_no_alpha`
[INFO] [stderr]    --> src/common.rs:290:1
[INFO] [stderr]     |
[INFO] [stderr] 290 | pub fn save_image_no_alpha(mut image : RgbaImage, save_path : &str)
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compress_image_to_buffer`
[INFO] [stderr]    --> src/common.rs:309:1
[INFO] [stderr]     |
[INFO] [stderr] 309 | pub fn compress_image_to_buffer(img: &image::RgbaImage) -> Vec<u8>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `compress_buffer`
[INFO] [stderr]    --> src/common.rs:327:1
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &Vec<u8>) -> Vec<u8>
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `CroppedImageBounds`
[INFO] [stderr]   --> src/compress.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | struct CroppedImageBounds {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `crop_function`
[INFO] [stderr]   --> src/compress.rs:43:1
[INFO] [stderr]    |
[INFO] [stderr] 43 | fn crop_function(img: &image::RgbaImage, offset : (u32, u32), max_width : u32, max_height : u32) -> (CroppedImageBounds, u64)
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:20:26
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let prev_x_offset = (prev_image.width() as i64 - original_image.width()  as i64)/2;
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.width())`
[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 u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:20:54
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let prev_x_offset = (prev_image.width() as i64 - original_image.width()  as i64)/2;
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image.width())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:21:25
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let prev_y_offset = prev_image.height() as i64 - original_image.height() as i64;
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.height())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/common.rs:21:54
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let prev_y_offset = prev_image.height() as i64 - original_image.height() as i64;
[INFO] [stderr]    |                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image.height())`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:198:12
[INFO] [stderr]     |
[INFO] [stderr] 198 |     return (value as u64) << (which_byte * 8);
[INFO] [stderr]     |            ^^^^^^^^^^^^^^ help: try: `u64::from(value)`
[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: the loop variable `i` is used to index `buf`
[INFO] [stderr]    --> src/common.rs:204:14
[INFO] [stderr]     |
[INFO] [stderr] 204 |     for i in 0..8
[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] 204 |     for (i, <item>) in buf.iter_mut().enumerate()
[INFO] [stderr]     |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/common.rs:212:42
[INFO] [stderr]     |
[INFO] [stderr] 212 | pub fn u8_buf_to_u64_little_endian(buf : &[u8; 8]) -> u64
[INFO] [stderr]     |                                          ^^^^^^^^ help: consider passing by value instead: `[u8; 8]`
[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] warning: the loop variable `i` is used to index `buf`
[INFO] [stderr]    --> src/common.rs:215:14
[INFO] [stderr]     |
[INFO] [stderr] 215 |     for i in 0..8
[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] 215 |     for (i, <item>) in buf.iter().enumerate().take(8)
[INFO] [stderr]     |         ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]    --> src/common.rs:223:39
[INFO] [stderr]     |
[INFO] [stderr] 223 | pub fn u8_buf_to_u32_big_endian(buf : &[u8; 4]) -> u32
[INFO] [stderr]     |                                       ^^^^^^^^ help: consider passing by value instead: `[u8; 4]`
[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: casting u8 to u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:225:5
[INFO] [stderr]     |
[INFO] [stderr] 225 |     (buf[0] as u32) << 24 |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[0])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:226:5
[INFO] [stderr]     |
[INFO] [stderr] 226 |     (buf[1] as u32) << 16 |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[1])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:227:5
[INFO] [stderr]     |
[INFO] [stderr] 227 |     (buf[2] as u32) << 8  |
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[2])`
[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 u32 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:228:5
[INFO] [stderr]     |
[INFO] [stderr] 228 |     (buf[3] as u32)
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^ help: try: `u32::from(buf[3])`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/common.rs:320:9
[INFO] [stderr]     |
[INFO] [stderr] 320 |         compressor.write(&imgclone.into_vec()).unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[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/common.rs:327:29
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &Vec<u8>) -> Vec<u8>
[INFO] [stderr]     |                             ^^^^^^^^
[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] help: change this to
[INFO] [stderr]     |
[INFO] [stderr] 327 | pub fn compress_buffer(img: &[u8]) -> Vec<u8>
[INFO] [stderr]     |                             ^^^^^
[INFO] [stderr] help: change `img.clone()` to
[INFO] [stderr]     |
[INFO] [stderr] 330 |     let imgclone = img.to_owned();
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/common.rs:338:9
[INFO] [stderr]     |
[INFO] [stderr] 338 |         compressor.write(&imgclone).unwrap();
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/common.rs:357:9
[INFO] [stderr]     |
[INFO] [stderr] 357 | /         let mut safe_i = 0;
[INFO] [stderr] 358 | |
[INFO] [stderr] 359 | |         // if dimensions given are 0,0, force dimensions to 1,1, then set i so that iterator
[INFO] [stderr] 360 | |         // will terminate immediately. This avoids a modulo (%) by zero error and does 0 iterations.
[INFO] [stderr] ...   |
[INFO] [stderr] 363 | |             safe_i = 2;
[INFO] [stderr] 364 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> safe_i = if dimensions.0 == 0 || dimensions.1 == 0 { ..; 2 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_let_if_seq)] on by default
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:463:46
[INFO] [stderr]     |
[INFO] [stderr] 463 |     if prev_x < 0 || prev_y < 0 || prev_x >= prev_image.width() as i64 || prev_y >= prev_image.height() as i64 {
[INFO] [stderr]     |                                              ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.width())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/common.rs:463:85
[INFO] [stderr]     |
[INFO] [stderr] 463 |     if prev_x < 0 || prev_y < 0 || prev_x >= prev_image.width() as i64 || prev_y >= prev_image.height() as i64 {
[INFO] [stderr]     |                                                                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(prev_image.height())`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:178:5
[INFO] [stderr]     |
[INFO] [stderr] 178 |     archive_file.write(&[0; FILE_FORMAT_HEADER_LENGTH]).expect("Unable to allocate header space in file");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:236:5
[INFO] [stderr]     |
[INFO] [stderr] 236 |     archive_file.write(&u64_to_u8_buf_little_endian(metadata_start)).expect("Unable to write header offset to file");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:265:22
[INFO] [stderr]     |
[INFO] [stderr] 265 |         let prev_x = x as i64 + x_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^ help: try: `i64::from(x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:266:22
[INFO] [stderr]     |
[INFO] [stderr] 266 |         let prev_y = y as i64 + y_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^ help: try: `i64::from(y)`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:281:70
[INFO] [stderr]     |
[INFO] [stderr] 281 |     print!("Diff: {} ", pretty_print_percent(debug_difference_count, original_image.width() as u64 * original_image.height() as u64));
[INFO] [stderr]     |                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u64::from(original_image.width())`
[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 u64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:281:102
[INFO] [stderr]     |
[INFO] [stderr] 281 |     print!("Diff: {} ", pretty_print_percent(debug_difference_count, original_image.width() as u64 * original_image.height() as u64));
[INFO] [stderr]     |                                                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u64::from(original_image.height())`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:297:22
[INFO] [stderr]     |
[INFO] [stderr] 297 |         let prev_x = original_image_x as i64 + x_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image_x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]    --> src/compress.rs:298:22
[INFO] [stderr]     |
[INFO] [stderr] 298 |         let prev_y = original_image_y as i64 + y_offset_to_other_image;
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i64::from(original_image_y)`
[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: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:311:13
[INFO] [stderr]     |
[INFO] [stderr] 311 |             image_compressor.write(&cropped_pixel.data).unwrap();
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/compress.rs:315:5
[INFO] [stderr]     |
[INFO] [stderr] 315 |     bitmap_compressor.write(&difference).unwrap();
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] error: handle read amount returned or use `Read::read_exact` instead
[INFO] [stderr]   --> src/extract.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     brotli_file.read(&mut header).expect("Unable to read brotli file header");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to i64 may become silently lossy if types change
[INFO] [stderr]   --> src/extract.rs:95:38
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 match try_get_pixel((x as i64 + x_offset_to_prev_image, y as i64 + y_offset_to_prev_image), &prev_image) {
[INFO] [stderr]    |                                      ^^^^^^^^ help: try: `i64::from(x)`
[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 i64 may become silently lossy if types change
[INFO] [stderr]   --> src/extract.rs:95:73
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 match try_get_pixel((x as i64 + x_offset_to_prev_image, y as i64 + y_offset_to_prev_image), &prev_image) {
[INFO] [stderr]    |                                                                         ^^^^^^^^ help: try: `i64::from(y)`
[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: the variable `pixel_count` is used as a loop counter. Consider using `for (pixel_count, item) in BlockXYIterator::new(50, (metadata.diff_width as usize, metadata.diff_height as usize)).enumerate()` or similar iterators
[INFO] [stderr]    --> src/extract.rs:104:22
[INFO] [stderr]     |
[INFO] [stderr] 104 |         for (x,y) in BlockXYIterator::new(50, (metadata.diff_width as usize, metadata.diff_height as usize)) {
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::explicit_counter_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_counter_loop
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]    --> src/extract.rs:130:25
[INFO] [stderr]     |
[INFO] [stderr] 130 |                     let ref mut w = std::io::BufWriter::new(&mut unoptimized_png_in_memory);
[INFO] [stderr]     |                     ----^^^^^^^^^----------------------------------------------------------- help: try: `let w = &mut std::io::BufWriter::new(&mut unoptimized_png_in_memory);`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 7 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `spritezip`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "549854c53ad48f28cf5812829d1b3b6ab3df249866ad364ab4a74c23a42e2fc2"`
[INFO] running `"docker" "rm" "-f" "549854c53ad48f28cf5812829d1b3b6ab3df249866ad364ab4a74c23a42e2fc2"`
[INFO] [stdout] 549854c53ad48f28cf5812829d1b3b6ab3df249866ad364ab4a74c23a42e2fc2