b.Fatalf("FindStringSubmatch(%q)[0] = %q; want %q", s, subs[0], wantSubs)
		}
		if subs[1] != "aab" {
			b.Fatalf("FindStringSubmatch(%q)[1] = %q; want %q", s, subs[1], "aab")
		}
	}
}

func BenchmarkLiteral(b *testing.B) {
	x := strings.Repeat("x", 50) + "y"
	b.StopTimer()
	re := MustCompile("y")
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		if !re.MatchString(x) {
			b.Fatalf("no match!")
		}
	}