func (ss *streamSafe) first(p Properties) {
	*ss = streamSafe(p.nTrailingNonStarters())
}

// insert returns a ssState value to indicate whether a rune represented by p
// can be inserted.
func (ss *streamSafe) next(p Properties) ssState {
	if *ss > maxNonStarters {
		panic("streamSafe was not reset")
	}
	n := p.nLeadingNonStarters()
	if *ss += streamSafe(n); *ss > maxNonStarters {
		*ss = 0

func (ss *streamSafe) first(p Properties) {
	*ss = streamSafe(p.nTrailingNonStarters())
}

// insert returns a ssState value to indicate whether a rune represented by p
// can be inserted.
func (ss *streamSafe) next(p Properties) ssState {
	if *ss > maxNonStarters {
		panic("streamSafe was not reset")
	}
	n := p.nLeadingNonStarters()
	if *ss += streamSafe(n); *ss > maxNonStarters {
		*ss = 0

	if info.size == 0 {
		if atEOF {
			return 1
		}
		return -1
	}
	ss := streamSafe(0)
	ss.first(info)

	for i := int(info.size); i < nsrc; i += int(info.size) {
		info = fd.info(src, i)
		if info.size == 0 {
			if atEOF {
				return i
			}
			return -1
		}
		// TODO: Using streamSafe to determine the boundary isn't the same as
		// using BoundaryBefore. Determine which should be used.

	if info.size == 0 {
		if atEOF {
			return 1
		}
		return -1
	}
	ss := streamSafe(0)
	ss.first(info)

	for i := int(info.size); i < nsrc; i += int(info.size) {
		info = fd.info(src, i)
		if info.size == 0 {
			if atEOF {
				return i
			}
			return -1
		}
		// TODO: Using streamSafe to determine the boundary isn't the same as
		// using BoundaryBefore. Determine which should be used.