class RSpec::Matchers::BuiltIn::All

def failure_message
  unless iterable?
    return "#{improve_hash_formatting(super)}, but was not iterable"
  end
  all_messages = [improve_hash_formatting(super)]
  failed_objects.each do |index, matcher_failure_message|
    all_messages << failure_message_for_item(index, matcher_failure_message)
  end
  all_messages.join("\n\n")
end