code: func (l *lexer) runCComment() {
  	for {
  		r := l.next()
  		switch r {
  		case eof:
  			return
  		case '*':
  			if l.peek() == '/' {
  				l.advance()
  				return
  			}
  		}
  	}
  }
docs: // https://dev.mysql.com/doc/refman/5.6/en/comments.html