Bump to edition 2021

Since our MSRV is 1.61, this won’t change anything because this edition
got made stable in 1.56.

Cargo.toml

@@ -1,8 +1,7 @@
 [package]
 name = "jpeg-decoder"
 version = "0.3.0"
-edition = "2018"
-resolver = "2"
+edition = "2021"
 
 rust-version = "1.61.0"
 

fuzz-afl/src/reproduce_decode.rs

@@ -12,6 +12,6 @@ fn main() {
     let data = utils::read_file_from_args();
     match decode(&data) {
         Ok(bytes) => println!("Decoded {} bytes", bytes.len()),
-        Err(e) => println!("Decoder returned an error: {:?}\nNote: Not a panic, this is fine.", e),
+        Err(e) => println!("Decoder returned an error: {e:?}\nNote: Not a panic, this is fine."),
     };
 }

src/decoder.rs

@@ -16,7 +16,6 @@ use alloc::{format, vec};
 use core::cmp;
 use core::mem;
 use core::ops::Range;
-use std::convert::TryInto;
 use std::io::Read;
 
 pub const MAX_COMPONENTS: usize = 4;

src/idct.rs

@@ -9,7 +9,7 @@
 #![allow(clippy::erasing_op)]
 #![allow(clippy::identity_op)]
 use crate::parser::Dimensions;
-use core::{convert::TryFrom, num::Wrapping};
+use core::num::Wrapping;
 
 pub(crate) fn choose_idct_size(full_size: Dimensions, requested_size: Dimensions) -> usize {
     fn scaled(len: u16, scale: usize) -> u16 {
@@ -234,7 +234,7 @@ pub(crate) fn dequantize_and_idct_block(
             output_linestride,
             output,
         ),
-        _ => panic!("Unsupported IDCT scale {}/8", scale),
+        _ => panic!("Unsupported IDCT scale {scale}/8"),
     }
 }
 

src/worker/immediate.rs

@@ -1,7 +1,6 @@
 use alloc::vec;
 use alloc::vec::Vec;
 use core::mem;
-use core::convert::TryInto;
 use crate::decoder::MAX_COMPONENTS;
 use crate::error::Result;
 use crate::idct::dequantize_and_idct_block;

src/worker/rayon.rs

@@ -1,5 +1,3 @@
-use core::convert::TryInto;
-
 use rayon::iter::{IndexedParallelIterator, ParallelIterator};
 use rayon::slice::ParallelSliceMut;
 

tests/common/mod.rs

@@ -28,7 +28,7 @@ pub fn test_files(test_dir: &Path) -> Vec<PathBuf> {
             let path = test_dir.join(Path::new(&line));
 
             if !test_files.contains(&path) {
-                panic!("The file {:?} specified in {:?} could not be found among the files being tested", line, test_dir.join("disabled.txt"));
+                panic!("The file {line:?} specified in {:?} could not be found among the files being tested", test_dir.join("disabled.txt"));
             }
 
             let position = test_files.iter().position(|p| p == &path).unwrap();

tests/reftest/mod.rs

@@ -116,7 +116,7 @@ fn reftest_decoder<T: std::io::Read>(mut decoder: jpeg::Decoder<T>, path: &Path,
         encoder.set_color(ref_pixel_format);
         encoder.write_header().expect("png failed to write header").write_image_data(&pixels).expect("png failed to write data");
 
-        panic!("decoding difference: {:?}, maximum difference was {}", output_path, max_diff);
+        panic!("decoding difference: {output_path:?}, maximum difference was {max_diff}");
     }
 }