code: func (as *Step) SetSTDERRStream(st *milo.LogdogStream) (updated bool) {
  	as.StderrStream, updated = as.maybeSetLogDogStream(as.StderrStream, st)
  	return
  }
docs: // SetSTDERRStream sets the LogDog STDERR stream value, returning true if the
  // Step was updated.