func(r rune) bool {
		return r != utf8.RuneError
	},
	"IsValidRune",
}

type TrimFuncTest struct {
	f        predicate
	in       string
	trimOut  []byte
	leftOut  []byte
	rightOut []byte
}

func not(p predicate) predicate {
	return predicate{
		func(r rune) bool {
			return !p.f(r)
		},
		"not " + p.name,
	}
}

        right = right << 31 | right >>> 1;
        work = (leftt ^ right) & 0xaaaaaaaa;
        leftt ^= work;
        right ^= work;
        leftt = leftt << 31 | leftt >>> 1;
        work = (leftt >>> 8 ^ right) & 0x00ff00ff;
        right ^= work;
        leftt ^= work << 8;
        work = (leftt >>> 2 ^ right) & 0x33333333;
        right ^= work;
        leftt ^= work << 2;
        work = (right >>> 16 ^ leftt) & 0x0000ffff;