code: func ReleaseWriter(qw *Writer) {
  	hw := qw.e.w.(*htmlEscapeWriter)
  	hw.w = nil
  	qw.e.Reset()
  	qw.e.w = hw
  
  	qw.n.Reset()
  
  	writerPool.Put(qw)
  }
docs: // ReleaseWriter returns the writer to the pool.
  //
  // Do not access released writer, otherwise data races may occur.