What would Go code look like with Swift 2.0-style error handling?

tryerror.go

// before
func CreateZipWithWriter(writer io.Writer, sourceRoot string) error {
  zf := zip.NewWriter(writer)
  defer zf.Close()
  return filepath.Walk(sourceRoot, func(p string, info os.FileInfo, err error) error {
    if err != nil || info.IsDir() {
      return err
    }
    relPath, err := filepath.Rel(sourceRoot, p)
    if err != nil {
      return err
    }
    zh, err := zip.FileInfoHeader(info)
    if err != nil {
      return err
    }
    zh.Name = relPath
    wf, err := zf.CreateHeader(zh)
    if err != nil {
      return err
    }
    rf, err := os.Open(p)
    if err != nil {
      return err
    }
    defer rf.Close()
    _, err = io.Copy(wf, rf)
    if err != nil {
      return err
    }
    return nil
  })
}

// after
func CreateZipWithWriter(writer io.Writer, sourceRoot string) error {
  zf := zip.NewWriter(writer)
  defer zf.Close()
  return filepath.Walk(sourceRoot, func(p string, info os.FileInfo, err error) error {
    if err != nil || info.IsDir() {
      return err
    }
    relPath := try filepath.Rel(sourceRoot, p)
    zh := try zip.FileInfoHeader(info)
    zh.Name = relPath
    wf := try zf.CreateHeader(zh)
    rf := try os.Open(p)
    defer rf.Close()
    try io.Copy(wf, rf)
    return nil
  })
}