code: func Render(c context.Context, name string, args Args) ([]byte, error) {
  	if b, _ := c.Value(&contextKey).(*boundBundle); b != nil {
  		return b.Render(c, b.Extra, name, args)
  	}
  	return nil, errNoBundle
  }
docs: // Render finds top level template with given name and calls its Execute or
  // ExecuteTemplate method (depending on the value of Bundle.DefaultTemplate).
  //
  // It always renders output into a byte buffer, to avoid partial results in case
  // of errors.