type tokenKind int

const (
	_EOF tokenKind = -(iota + 1)
	_EOLCOMMENT
	_IDENT
	_STRING
	_COMMENT

	// newlines and punctuation tokens are allowed as ASCII codes.
)

func (k tokenKind) isComment() bool {
	return k == _COMMENT || k == _EOLCOMMENT
}

// isEOL returns whether a token terminates a line.
func (k tokenKind) isEOL() bool {
	return k == _EOF || k == _EOLCOMMENT || k == '\n'
}

		linebreaks: form == 0,
	}

	defer func() {
		n = p.written
		if e := recover(); e != nil {
			err = e.(writeError).err // re-panics if it's not a writeError
		}
	}()

	p.print(x)
	p.flush(_EOF)

	return
}

// String is a convenience function that prints n in ShortForm
// and returns the printed string.
func String(n Node) string {
	var buf strings.Builder
	_, err := Fprint(&buf, n, ShortForm)