continue
		}
		for c := lo; c <= hi; c += stride {
			r = appendRange(r, c, c)
		}
	}
	return r
}

// appendNegatedTable returns the result of appending the negation of x to the class r.
func appendNegatedTable(r []rune, x *unicode.RangeTable) []rune {
	nextLo := '\u0000' // lo end of next class to add
	for _, xr := range x.R16 {