} else {
						var resultErrno, expectErrno uintptr
						if pathErr, ok := err.(*os.PathError); ok {
							if errno, pok := pathErr.Err.(syscall.Errno); pok {
								resultErrno = uintptr(errno)
							}
						}
						if pathErr, ok := testCase.expectedErr.(*os.PathError); ok {
							if errno, pok := pathErr.Err.(syscall.Errno); pok {
								expectErrno = uintptr(errno)
							}
						}

		2: {"-", 10, ""},
		3: {"gopher", 0, ""},
		4: {"-", -1, "negative"},
		5: {"--", -102, "negative"},
		6: {string(make([]byte, 255)), int((^uint(0))/255 + 1), "overflow"},
	})

	const is64Bit = 1<<(^uintptr(0)>>63)/2 != 0
	if !is64Bit {
		return
	}

	runTestCases("64-bit", []testCase{
		0: {"-", maxInt, "out of range"},
	})
}

type RunesTest struct {
	in    string
	out   []rune