// Build tags separated by a comma are AND-ed together.
	assertNot(shouldTest("// +build !windows,!plan9", "windows", "amd64"))
	assertNot(shouldTest("// +build !windows,!plan9", "plan9", "386"))

	// Build tags on multiple lines are AND-ed together.
	assert(shouldTest("// +build !windows\n// +build amd64", "linux", "amd64"))

		}
	}
	var deleted [len(versions)]bool
	checkVerExist := func(t testing.TB) {
		t.Helper()
		for i := range versions {
			shouldExist := !deleted[i]
			fi, err := xl.ReadVersion(ctx, "", volume, object, versions[i], ReadOptions{})
			if shouldExist {
				if err != nil {
					t.Fatalf("Version %s should exist, but got err %v", versions[i], err)
				}
				return
			}