writeCollection(value.children)
        }
    }

    override suspend fun ReadContext.decode(): DefaultCopySpec {
        return decodePreservingIdentity { id ->
            val destPath = readNullableString()
            val sourceFiles = read() as FileCollection
            val patterns = read() as PatternSet
            val duplicatesStrategy = readEnum<DuplicatesStrategy>()

	}
	for _, testPath := range matches {
		testPath := testPath
		testName, err := filepath.Rel("./testdata", testPath)
		if err != nil {
			t.Fatalf("failed to relativize testdata path: %v", err)
		}
		t.Run(testName, func(t *testing.T) {
			tr, exp, err := testtrace.ParseFile(testPath)
			if err != nil {
				t.Fatalf("failed to parse test file at %s: %v", testPath, err)
			}
			testReader(t, tr, exp)
		})

// ParseFile parses a test file generated by the testgen package.
func ParseFile(testPath string) (io.Reader, *Expectation, error) {
	ar, err := txtar.ParseFile(testPath)
	if err != nil {
		return nil, nil, fmt.Errorf("failed to read test file for %s: %v", testPath, err)
	}
	if len(ar.Files) != 2 {
		return nil, nil, fmt.Errorf("malformed test %s: wrong number of files", testPath)
	}
	if ar.Files[0].Name != "expect" {

}

func TestRelatedGoroutinesV2Trace(t *testing.T) {
	testPath := "testdata/tests/go122-gc-stress.test"
	trc, _, err := testtrace.ParseFile(testPath)
	if err != nil {
		t.Fatalf("malformed test %s: bad trace file: %v", testPath, err)
	}

	// Create a reader.
	r, err := trace.NewReader(trc)
	if err != nil {
		t.Fatalf("failed to create trace reader for %s: %v", testPath, err)
	}

	// Collect all the events.

	}
	return
}

func getTestTrace(t *testing.T, testPath string) *parsedTrace {
	t.Helper()

	// First read in the text trace and write it out as bytes.
	f, err := os.Open(testPath)
	if err != nil {
		t.Fatalf("failed to open test %s: %v", testPath, err)
	}
	r, err := raw.NewTextReader(f)
	if err != nil {
		t.Fatalf("failed to read test %s: %v", testPath, err)
	}
	var trace bytes.Buffer

			}
		}
	}
	t.Run("V2", func(t *testing.T) {
		testPath := "testdata/tests/go122-gc-stress.test"
		r, _, err := testtrace.ParseFile(testPath)
		if err != nil {
			t.Fatalf("malformed test %s: bad trace file: %v", testPath, err)
		}
		var events []trace.Event
		tr, err := trace.NewReader(r)
		if err != nil {
			t.Fatalf("malformed test %s: bad trace file: %v", testPath, err)
		}
		for {
			ev, err := tr.ReadEvent()

			return err
		}
		if skip {
			continue
		}

		fmt.Fprintf(os.Stderr, "generating %s... ", name)

		// Get the test path.
		testPath := filepath.Join(genroot, fmt.Sprintf("%s.test", name))

		// Run generator.
		cmd := exec.Command("go", "run", path, testPath)
		if out, err := cmd.CombinedOutput(); err != nil {
			return fmt.Errorf("running generator %s: %v:\n%s", name, err, out)
		}
		fmt.Fprintln(os.Stderr)

	if err := d.calcError(); err != nil {
		return RenameDataResp{}, err
	}
	return d.disk.RenameData(ctx, srcVolume, srcPath, fi, dstVolume, dstPath, opts)
}

func (d *naughtyDisk) RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) error {
	if err := d.calcError(); err != nil {

	ReadXL(ctx context.Context, volume, path string, readData bool) (RawFileInfo, error)
	RenameData(ctx context.Context, srcVolume, srcPath string, fi FileInfo, dstVolume, dstPath string, opts RenameOptions) (RenameDataResp, error)

	// File operations.
	ListDir(ctx context.Context, origvolume, volume, dirPath string, count int) ([]string, error)

	}
	return outname
}

func testPath(t *testing.T, path, srcDir string) *types.Package {
	t0 := time.Now()
	fset := token.NewFileSet()
	pkg, err := Import(fset, make(map[string]*types.Package), path, srcDir, nil)
	if err != nil {
		t.Errorf("testPath(%s): %s", path, err)
		return nil
	}
	t.Logf("testPath(%s): %v", path, time.Since(t0))
	return pkg
}