for i := range b {
			idx := Index(b[i:], q[j:])
			if idx != -1 {
				t.Fatalf("Index(b[%d:], q[%d:])=%d, want -1\n", i, j, idx)
			}
		}
	}
	q[len(q)-1] = 0
}

func TestCountNearPageBoundary(t *testing.T) {
	t.Parallel()
	b := dangerousSlice(t)
	for i := range b {
		c := Count(b[i:], []byte{1})
		if c != 0 {
			t.Fatalf("Count(b[%d:], {1})=%d, want 0\n", i, c)
		}