return r.pendBuf[0], err
}

// ReadRune returns the next UTF-8 encoded code point from the
// io.Reader inside r.
func (r *readRune) ReadRune() (rr rune, size int, err error) {
	if r.peekRune >= 0 {
		rr = r.peekRune
		r.peekRune = ^r.peekRune
		size = utf8.RuneLen(rr)
		return
	}
	r.buf[0], err = r.readByte()
	if err != nil {
		return
	}
	if r.buf[0] < utf8.RuneSelf { // fast check for common ASCII case

	})
	panic(&in.parseErrors)
}

// eof reports whether the input has reached end of file.
func (in *input) eof() bool {
	return len(in.remaining) == 0
}

// peekRune returns the next rune in the input without consuming it.
func (in *input) peekRune() int {
	if len(in.remaining) == 0 {
		return 0
	}
	r, _ := utf8.DecodeRune(in.remaining)
	return int(r)
}