fn read_isize(&mut self) -> Result<isize> {
        let mut buffer = String::new();
        self.reader.read_line(&mut buffer)?;
        let trimmed = buffer.trim_end();
        match trimmed.parse::<isize>() {
            Ok(x) => Ok(x),
            Err(_) => Err(Error::Syntax),
        }
    }
// read until LF, trim end, and parse to isize.
read until LF, trim end, and parse to isize.
read until LF trim end and parse to isize .
fn read_isize(&mut self) -> Result<isize> {
        let mut buffer = String::new();
        self.reader.read_line(&mut buffer)?;
        let trimmed = buffer.trim_end();
        match trimmed.parse::<isize>() {
            Ok(x) => Ok(x),
            Err(_) => Err(Error::Syntax),
        }
    }
fn read_isize ( & mut self ) -> Result < isize > { let mut buffer = String :: new ( ) ; self . reader . read_line ( & mut buffer ) ? ; let trimmed = buffer . trim_end ( ) ; match trimmed . parse :: < isize > ( ) { Ok ( x ) => Ok ( x ) , Err ( _ ) => Err ( Error :: Syntax ) , } }
read until LF, trim end, and parse to isize.
read until LF trim end and parse to isize .
&mut self