code: @Deprecated
  	@PublicEvolving
  	public DataSink<T> printToErr(String sinkIdentifier) {
  		return output(new PrintingOutputFormat<T>(sinkIdentifier, true));
  	}
docs: Writes a DataSet to the standard error stream (stderr).
  
  <p>For each element of the DataSet the result of {@link Object#toString()} is written.
  
  @param sinkIdentifier The string to prefix the output with.
  @return The DataSink that writes the DataSet.
  
  @deprecated Use {@link #printOnTaskManager(String)} instead, or the {@link PrintingOutputFormat}.