class RSpec::Expectations::FailureAggregator

def call(failure, options)

expected by `RSpec::Support.with_failure_notifier`.
This method is defined to satisfy the callable interface
def call(failure, options)
  source_id = options[:source_id]
  return if source_id && @seen_source_ids.key?(source_id)
  @seen_source_ids[source_id] = true
  assign_backtrace(failure) unless failure.backtrace
  failures << failure
  AGGREGATED_FAILURE
end