uucore: Fix a clippy warning

The following explicit lifetimes could be elided: 'a

src/uu/csplit/src/csplit.rs

@@ -197,7 +197,7 @@ struct SplitWriter<'a> {
     dev_null: bool,
 }
 
-impl<'a> Drop for SplitWriter<'a> {
+impl Drop for SplitWriter<'_> {
     fn drop(&mut self) {
         if self.options.elide_empty_files && self.size == 0 {
             let file_name = self.options.split_name.get(self.counter);
@@ -206,7 +206,7 @@ impl<'a> Drop for SplitWriter<'a> {
     }
 }
 
-impl<'a> SplitWriter<'a> {
+impl SplitWriter<'_> {
     fn new(options: &CsplitOptions) -> SplitWriter {
         SplitWriter {
             options,

src/uu/cut/src/matcher.rs

@@ -23,7 +23,7 @@ impl<'a> ExactMatcher<'a> {
     }
 }
 
-impl<'a> Matcher for ExactMatcher<'a> {
+impl Matcher for ExactMatcher<'_> {
     fn next_match(&self, haystack: &[u8]) -> Option<(usize, usize)> {
         let mut pos = 0usize;
         loop {

src/uu/cut/src/searcher.rs

@@ -27,7 +27,7 @@ impl<'a, 'b, M: Matcher> Searcher<'a, 'b, M> {
 // Iterate over field delimiters
 // Returns (first, last) positions of each sequence, where `haystack[first..last]`
 // corresponds to the delimiter.
-impl<'a, 'b, M: Matcher> Iterator for Searcher<'a, 'b, M> {
+impl<M: Matcher> Iterator for Searcher<'_, '_, M> {
     type Item = (usize, usize);
 
     fn next(&mut self) -> Option<Self::Item> {

src/uu/date/src/date.rs

@@ -103,7 +103,7 @@ enum Iso8601Format {
     Ns,
 }
 
-impl<'a> From<&'a str> for Iso8601Format {
+impl From<&str> for Iso8601Format {
     fn from(s: &str) -> Self {
         match s {
             HOURS => Self::Hours,
@@ -123,7 +123,7 @@ enum Rfc3339Format {
     Ns,
 }
 
-impl<'a> From<&'a str> for Rfc3339Format {
+impl From<&str> for Rfc3339Format {
     fn from(s: &str) -> Self {
         match s {
             DATE => Self::Date,

src/uu/dd/src/dd.rs

@@ -424,7 +424,7 @@ fn make_linux_iflags(iflags: &IFlags) -> Option<libc::c_int> {
     }
 }
 
-impl<'a> Read for Input<'a> {
+impl Read for Input<'_> {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         let mut base_idx = 0;
         let target_len = buf.len();
@@ -447,7 +447,7 @@ impl<'a> Read for Input<'a> {
     }
 }
 
-impl<'a> Input<'a> {
+impl Input<'_> {
     /// Discard the system file cache for the given portion of the input.
     ///
     /// `offset` and `len` specify a contiguous portion of the input.
@@ -928,7 +928,7 @@ enum BlockWriter<'a> {
     Unbuffered(Output<'a>),
 }
 
-impl<'a> BlockWriter<'a> {
+impl BlockWriter<'_> {
     fn discard_cache(&self, offset: libc::off_t, len: libc::off_t) {
         match self {
             Self::Unbuffered(o) => o.discard_cache(offset, len),

src/uu/env/src/variable_parser.rs

@@ -11,7 +11,7 @@ pub struct VariableParser<'a, 'b> {
     pub parser: &'b mut StringParser<'a>,
 }
 
-impl<'a, 'b> VariableParser<'a, 'b> {
+impl<'a> VariableParser<'a, '_> {
     fn get_current_char(&self) -> Option<char> {
         self.parser.peek().ok()
     }

src/uu/fmt/src/linebreak.rs

@@ -20,7 +20,7 @@ struct BreakArgs<'a> {
     ostream: &'a mut BufWriter<Stdout>,
 }
 
-impl<'a> BreakArgs<'a> {
+impl BreakArgs<'_> {
     fn compute_width(&self, winfo: &WordInfo, posn: usize, fresh: bool) -> usize {
         if fresh {
             0

src/uu/fmt/src/parasplit.rs

@@ -73,7 +73,7 @@ pub struct FileLines<'a> {
     lines: Lines<&'a mut FileOrStdReader>,
 }
 
-impl<'a> FileLines<'a> {
+impl FileLines<'_> {
     fn new<'b>(opts: &'b FmtOptions, lines: Lines<&'b mut FileOrStdReader>) -> FileLines<'b> {
         FileLines { opts, lines }
     }
@@ -144,7 +144,7 @@ impl<'a> FileLines<'a> {
     }
 }
 
-impl<'a> Iterator for FileLines<'a> {
+impl Iterator for FileLines<'_> {
     type Item = Line;
 
     fn next(&mut self) -> Option<Line> {
@@ -232,7 +232,7 @@ pub struct ParagraphStream<'a> {
     opts: &'a FmtOptions,
 }
 
-impl<'a> ParagraphStream<'a> {
+impl ParagraphStream<'_> {
     pub fn new<'b>(opts: &'b FmtOptions, reader: &'b mut FileOrStdReader) -> ParagraphStream<'b> {
         let lines = FileLines::new(opts, reader.lines()).peekable();
         // at the beginning of the file, we might find mail headers
@@ -273,7 +273,7 @@ impl<'a> ParagraphStream<'a> {
     }
 }
 
-impl<'a> Iterator for ParagraphStream<'a> {
+impl Iterator for ParagraphStream<'_> {
     type Item = Result<Paragraph, String>;
 
     #[allow(clippy::cognitive_complexity)]
@@ -491,7 +491,7 @@ struct WordSplit<'a> {
     prev_punct: bool,
 }
 
-impl<'a> WordSplit<'a> {
+impl WordSplit<'_> {
     fn analyze_tabs(&self, string: &str) -> (Option<usize>, usize, Option<usize>) {
         // given a string, determine (length before tab) and (printed length after first tab)
         // if there are no tabs, beforetab = -1 and aftertab is the printed length
@@ -517,7 +517,7 @@ impl<'a> WordSplit<'a> {
     }
 }
 
-impl<'a> WordSplit<'a> {
+impl WordSplit<'_> {
     fn new<'b>(opts: &'b FmtOptions, string: &'b str) -> WordSplit<'b> {
         // wordsplits *must* start at a non-whitespace character
         let trim_string = string.trim_start();

src/uu/join/src/join.rs

@@ -109,7 +109,7 @@ struct MultiByteSep<'a> {
     finder: Finder<'a>,
 }
 
-impl<'a> Separator for MultiByteSep<'a> {
+impl Separator for MultiByteSep<'_> {
     fn field_ranges(&self, haystack: &[u8], len_guess: usize) -> Vec<(usize, usize)> {
         let mut field_ranges = Vec::with_capacity(len_guess);
         let mut last_end = 0;

src/uu/od/src/inputdecoder.rs

@@ -33,7 +33,7 @@ where
     byte_order: ByteOrder,
 }
 
-impl<'a, I> InputDecoder<'a, I> {
+impl<I> InputDecoder<'_, I> {
     /// Creates a new `InputDecoder` with an allocated buffer of `normal_length` + `peek_length` bytes.
     /// `byte_order` determines how to read multibyte formats from the buffer.
     pub fn new(
@@ -55,7 +55,7 @@ impl<'a, I> InputDecoder<'a, I> {
     }
 }
 
-impl<'a, I> InputDecoder<'a, I>
+impl<I> InputDecoder<'_, I>
 where
     I: PeekRead,
 {
@@ -81,7 +81,7 @@ where
     }
 }
 
-impl<'a, I> HasError for InputDecoder<'a, I>
+impl<I> HasError for InputDecoder<'_, I>
 where
     I: HasError,
 {
@@ -103,7 +103,7 @@ pub struct MemoryDecoder<'a> {
     byte_order: ByteOrder,
 }
 
-impl<'a> MemoryDecoder<'a> {
+impl MemoryDecoder<'_> {
     /// Set a part of the internal buffer to zero.
     /// access to the whole buffer is possible, not just to the valid data.
     pub fn zero_out_buffer(&mut self, start: usize, end: usize) {

src/uu/od/src/multifilereader.rs

@@ -28,7 +28,7 @@ pub trait HasError {
     fn has_error(&self) -> bool;
 }
 
-impl<'b> MultifileReader<'b> {
+impl MultifileReader<'_> {
     pub fn new(fnames: Vec<InputSource>) -> MultifileReader {
         let mut mf = MultifileReader {
             ni: fnames,
@@ -76,7 +76,7 @@ impl<'b> MultifileReader<'b> {
     }
 }
 
-impl<'b> io::Read for MultifileReader<'b> {
+impl io::Read for MultifileReader<'_> {
     // Fill buf with bytes read from the list of files
     // Returns Ok(<number of bytes read>)
     // Handles io errors itself, thus always returns OK
@@ -113,7 +113,7 @@ impl<'b> io::Read for MultifileReader<'b> {
     }
 }
 
-impl<'b> HasError for MultifileReader<'b> {
+impl HasError for MultifileReader<'_> {
     fn has_error(&self) -> bool {
         self.any_err
     }

src/uu/shuf/src/shuf.rs

@@ -380,7 +380,7 @@ impl<'a> NonrepeatingIterator<'a> {
     }
 }
 
-impl<'a> Iterator for NonrepeatingIterator<'a> {
+impl Iterator for NonrepeatingIterator<'_> {
     type Item = usize;
 
     fn next(&mut self) -> Option<usize> {
@@ -407,7 +407,7 @@ trait Writable {
     fn write_all_to(&self, output: &mut impl Write) -> Result<(), Error>;
 }
 
-impl<'a> Writable for &'a [u8] {
+impl Writable for &[u8] {
     fn write_all_to(&self, output: &mut impl Write) -> Result<(), Error> {
         output.write_all(self)
     }

src/uu/sort/src/merge.rs

@@ -267,7 +267,7 @@ pub struct FileMerger<'a> {
     reader_join_handle: JoinHandle<UResult<()>>,
 }
 
-impl<'a> FileMerger<'a> {
+impl FileMerger<'_> {
     /// Write the merged contents to the output file.
     pub fn write_all(self, settings: &GlobalSettings, output: Output) -> UResult<()> {
         let mut out = output.into_write();
@@ -341,7 +341,7 @@ struct FileComparator<'a> {
     settings: &'a GlobalSettings,
 }
 
-impl<'a> Compare<MergeableFile> for FileComparator<'a> {
+impl Compare<MergeableFile> for FileComparator<'_> {
     fn compare(&self, a: &MergeableFile, b: &MergeableFile) -> Ordering {
         let mut cmp = compare_by(
             &a.current_chunk.lines()[a.line_idx],

src/uu/split/src/filenames.rs

@@ -341,7 +341,7 @@ impl<'a> FilenameIterator<'a> {
     }
 }
 
-impl<'a> Iterator for FilenameIterator<'a> {
+impl Iterator for FilenameIterator<'_> {
     type Item = String;
 
     fn next(&mut self) -> Option<Self::Item> {

src/uu/split/src/split.rs

@@ -748,7 +748,7 @@ impl<'a> ByteChunkWriter<'a> {
     }
 }
 
-impl<'a> Write for ByteChunkWriter<'a> {
+impl Write for ByteChunkWriter<'_> {
     /// Implements `--bytes=SIZE`
     fn write(&mut self, mut buf: &[u8]) -> std::io::Result<usize> {
         // If the length of `buf` exceeds the number of bytes remaining
@@ -872,7 +872,7 @@ impl<'a> LineChunkWriter<'a> {
     }
 }
 
-impl<'a> Write for LineChunkWriter<'a> {
+impl Write for LineChunkWriter<'_> {
     /// Implements `--lines=NUMBER`
     fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
         // If the number of lines in `buf` exceeds the number of lines
@@ -978,7 +978,7 @@ impl<'a> LineBytesChunkWriter<'a> {
     }
 }
 
-impl<'a> Write for LineBytesChunkWriter<'a> {
+impl Write for LineBytesChunkWriter<'_> {
     /// Write as many lines to a chunk as possible without
     /// exceeding the byte limit. If a single line has more bytes
     /// than the limit, then fill an entire single chunk with those

src/uu/tail/src/chunks.rs

@@ -64,7 +64,7 @@ impl<'a> ReverseChunks<'a> {
     }
 }
 
-impl<'a> Iterator for ReverseChunks<'a> {
+impl Iterator for ReverseChunks<'_> {
     type Item = Vec<u8>;
 
     fn next(&mut self) -> Option<Self::Item> {

src/uu/wc/src/utf8/read.rs

@@ -27,7 +27,7 @@ pub enum BufReadDecoderError<'a> {
     Io(io::Error),
 }
 
-impl<'a> fmt::Display for BufReadDecoderError<'a> {
+impl fmt::Display for BufReadDecoderError<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             BufReadDecoderError::InvalidByteSequence(bytes) => {
@@ -38,7 +38,7 @@ impl<'a> fmt::Display for BufReadDecoderError<'a> {
     }
 }
 
-impl<'a> Error for BufReadDecoderError<'a> {
+impl Error for BufReadDecoderError<'_> {
     fn source(&self) -> Option<&(dyn Error + 'static)> {
         match *self {
             BufReadDecoderError::InvalidByteSequence(_) => None,

src/uucore/src/lib/features/sum.rs

@@ -403,7 +403,7 @@ impl<'a> DigestWriter<'a> {
     }
 }
 
-impl<'a> Write for DigestWriter<'a> {
+impl Write for DigestWriter<'_> {
     #[cfg(not(windows))]
     fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
         self.digest.hash_update(buf);