38     fn index(&self) -> usize;  in index()  argument
54     fn cached_len(&mut self) -> Option<usize>;  in cached_len()  argument
78     fn remainder_len(&self) -> usize;  in remainder_len()  argument
92     fn next_n(&mut self, n: usize) -> Result<Option<&[u8]>, Self::Error>;  in next_n()
96     fn peek_n(&mut self, n: usize) -> Result<Option<&[u8]>, Self::Error>;  in peek_n()
100     fn discard_n(&mut self, n: usize);  in discard_n()  argument
106     line: usize,
107     column: usize,
113     pub(crate) fn new(line: usize, column: usize) -> Self {  in new()  argument
119     pub(crate) fn line(&self) -> usize {  in line()  argument
125     pub(crate) fn column(&self) -> usize {  in column()  argument