class RSpec::Mocks::ErrorGenerator

def diff_message(expected_args, actual_args)

def diff_message(expected_args, actual_args)
  formatted_expected_args = expected_args.map do |x|
    RSpec::Support.rspec_description_for_object(x)
  end
  formatted_expected_args, actual_args = unpack_string_args(formatted_expected_args, actual_args)
  differ.diff(actual_args, formatted_expected_args)
end