def __init__(self, job, function_handle_string, trace_canonical_url,
               failure_type_name, description, stack):
    assert isinstance(job, job_module.Job)

    self.job = job
    self.function_handle_string = function_handle_string
    self.trace_canonical_url = trace_canonical_url
    self.failure_type_name = failure_type_name
    self.description = description
    self.stack = stack