code: protected final void setLeftMessage(@Nullable final CharSequence message,
                                          @Nullable final Drawable icon) {
          setLeftMessage(message, icon, true);
      }
docs: Shows a specific message, which is marked as an error, at the left edge of the view.
  
  @param message
  The message, which should be shown, as an instance of the type {@link CharSequence}
  or null, if no message should be shown
  @param icon
  The icon, which should be shown, as an instance of the type {@link Drawable} or null,
  if no icon should be shown