t.Fatal(err)
	}
	if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(dst, data, 0666); err != nil {
		t.Fatal(err)
	}
}

func TestGo2C2Go(t *testing.T) {
	switch GOOS {
	case "darwin", "ios", "windows":
		// Non-ELF shared libraries don't support the multiple
		// copies of the runtime package implied by this test.