Function tchar

pub fn tchar<I, E>(input: I) -> IResult<I, char, E>
where
    I: Input,
    <I as Input>::Item: AsChar,
    E: ParseError<I>,

TCHAR = "!" / "#" / "$" / "%" / "&" / "'" / "*"
      / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
      / DIGIT / ALPHA