def handle_output(self, workunit, label, s):
    pass
Postorder traversal, applying a function to each operator.  The
dataset/ETHPy150Open pantsbuild/pants/src/python/pants/reporting/quiet_reporter.py/QuietReporter.handle_output--crossover with--dataset/ETHPy150Open uwescience/raco/raco/algebra.py/Operator.postorder