Method bump

std/re/src/main/parser.rs:34–38

(&mut self)

    fn peek(&self) -> Option<char> { self.p.get(self.pos).copied() }
    fn at(&self, i: usize) -> Option<char> { self.p.get(self.pos + i).copied() }
    fn bump(&mut self) -> Option<char> {
        let c = self.peek();
        if c.is_some() { self.pos += 1; }
        c
    }
    fn err(&self, msg: &'static str) -> ParseError { ParseError { msg, pos: self.pos } }

    fn expect(&mut self, c: char) -> Result<(), ParseError> {