code: protected synchronized void writeStreamOutput(SystemLogHolder holder, String txt, boolean rawStream) {
          if (holder == systemErr && rawStream) {
              txt = "[err] " + txt;
          }
          holder.originalStream.println(txt);
      }
docs: Write the text to the associated original stream.
  This is preserved as a subroutine for extension by other delegates (test, JSR47 logging)
  
  @param tc StreamTraceComponent associated with original stream
  @param txt pre-formatted or raw message
  @param rawStream if true, this is from direct invocation of System.out or System.err