snowballword/snowballword.go
func (w *SnowballWord) FitsInR2(x int) bool {
	return w.R2start <= len(w.RS)-x
}
func (w *SnowballWord) FitsInR2(x int) bool {
	return w.R2start <= len(w.RS)-x
}
// Returns true if `x` runes would fit into R2.
//