MXParser.setInput(InputStream) contains unaccessible code

MXParser.setInput(InputStream) contains the following code snippet:

...
Reader r = XmlReader.createReader(in);
/* 07-Mar-2006, TSa: Let's figure out encoding we detected

• (whether based on xml declaration, BOM, or recognized
• signature)...
  */
  String enc = null;
  if (r instanceof XmlReader.BaseReader) { enc = ((XmlReader.BaseReader) r).getEncoding(); }

  ...

However, XmlReader.createReader(InputStream) currently just returns a new XmlReader object. Unless I am being silly, I can't see that r will ever be instanceof XmlReader.BaseReader. Stepping through the code seems to verify this.