code: def __exit__(self, *_exc):
      assert self._output
      self._output.wait_and_close()
      self._output = None
  
imports: import logging
  import os
  import subprocess
  import time
  from guild import config
  from guild import exit_code
  from guild import log
  from guild import op_dep
  from guild import op_util
  from guild import run
  from guild import util
label_desc: Use image node_id 3 for calling the _RunOutput obj's underlying member method code with example usage: obj.__exit__() without return types