class RSpec::Mocks::ErrorGenerator

def error_message(expectation, args_for_multiple_calls)
  expected_args = format_args(expectation.expected_args)
  actual_args = format_received_args(args_for_multiple_calls)
  if RSpec::Support::RubyFeatures.distincts_kw_args_from_positional_hash?
    expected_hash = expectation.expected_args.last
    actual_hash = args_for_multiple_calls.last.last
    if Hash === expected_hash && Hash === actual_hash &&
      (Hash.ruby2_keywords_hash?(expected_hash) != Hash.ruby2_keywords_hash?(actual_hash))
      actual_description = Hash.ruby2_keywords_hash?(actual_hash) ? " (keyword arguments)" : " (options hash)"
      expected_description = Hash.ruby2_keywords_hash?(expected_hash) ? " (keyword arguments)" : " (options hash)"
      if actual_description != expected_description
        actual_args += actual_description
        expected_args += expected_description
      end
    end
  end
  message = default_error_message(expectation, expected_args, actual_args)
  if args_for_multiple_calls.one?
    diff = diff_message(expectation.expected_args, args_for_multiple_calls.first)
    if RSpec::Mocks.configuration.color?
      message << "\nDiff:#{diff}" unless diff.gsub(/\e\[\d+m/, '').strip.empty?
    else
      message << "\nDiff:#{diff}" unless diff.strip.empty?
    end
  end
  message
end