for _, ts := range testStrings {
		for _, m := range utf8map {
			for _, s := range []string{ts + m.str, m.str + ts, ts + m.str + ts} {
				testSequence(t, s)
			}
		}
	}
}

func runtimeRuneCount(s string) int {
	return len([]rune(s)) // Replaced by gc with call to runtime.countrunes(s).
}

// Check that a range loop, len([]rune(string)) optimization and
// []rune conversions visit the same runes.