}

	outfile := filepath.Join(dir, "alias.o")

	if testLang(t, "go9.99", src, outfile) == nil {
		t.Error("compilation with -lang=go9.99 succeeded unexpectedly")
	}

	// This test will have to be adjusted if we ever reach 1.99 or 2.0.
	if testLang(t, "go1.99", src, outfile) == nil {
		t.Error("compilation with -lang=go1.99 succeeded unexpectedly")
	}

	if testLang(t, "go1.8", src, outfile) == nil {

	{"go1.19rc1", "go1.19.0", -1},
	{"go1.19alpha3", "go1.19beta2", -1},
	{"go1.19beta2", "go1.19rc1", -1},
	{"go1.1", "go1.99999999999999998", -1},
	{"go1.99999999999999998", "go1.99999999999999999", -1},
}

func TestLang(t *testing.T) { test1(t, langTests, "Lang", Lang) }

var langTests = []testCase1[string, string]{
	{"bad", ""},
	{"go1.2rc3", "go1.2"},
	{"go1.2.3", "go1.2"},
	{"go1.2", "go1.2"},
	{"go1", "go1"},

	{"1.19rc1", "1.19.0", -1},
	{"1.19alpha3", "1.19beta2", -1},
	{"1.19beta2", "1.19rc1", -1},
	{"1.1", "1.99999999999999998", -1},
	{"1.99999999999999998", "1.99999999999999999", -1},
}

func TestLang(t *testing.T) { test1(t, langTests, "Lang", Lang) }

var langTests = []testCase1[string, string]{
	{"1.2rc3", "1.2"},
	{"1.2.3", "1.2"},
	{"1.2", "1.2"},
	{"1", "1"},
	{"1.999testmod", "1.999"},
}

	{"1.24.0", Version{"1", "24", "0", "", ""}},
	{"1.999testmod", Version{"1", "999", "", "testmod", ""}},
	{"1.99999999999999999", Version{"1", "99999999999999999", "", "", ""}},
}

func TestLang(t *testing.T) { test1(t, langTests, "Lang", Lang) }

var langTests = []testCase1[string, string]{
	{"1.2rc3", "1.2"},
	{"1.2.3", "1.2"},
	{"1.2", "1.2"},
	{"1", "1"},
	{"1.999testmod", "1.999"},
}