class RSpec::Matchers::BuiltIn::Eql

def failure_message
  if string_encoding_differs?
    "\nexpected: #{format_encoding(expected)} #{expected_formatted}\n     got: #{format_encoding(actual)} #{actual_formatted}\n\n(compared using eql?)\n"
  else
    "\nexpected: #{expected_formatted}\n     got: #{actual_formatted}\n\n(compared using eql?)\n"
  end
end