module Marshal

def dump_with_mocks(object, *rest)

serialization will fail because methods exist on the singleton class.
Duplicates any mock objects before serialization. Otherwise, 
def dump_with_mocks(object, *rest)
  if ::RSpec::Mocks.space.nil? || !::RSpec::Mocks.space.registered?(object) || NilClass === object
    dump_without_mocks(object, *rest)
  else
    unless ::RSpec::Mocks.configuration.marshal_patched?
      RSpec.warn_deprecation(<<-EOS.gsub(/^\s+\|/, ''))
        |Using Marshal.dump on stubbed objects relies on a monkey-patch
        |that is being made opt-in in RSpec 3. To silence this warning
        |please explicitly enable it:
        |
        |RSpec.configure do |rspec|
        |  rspec.mock_with :rspec do |mocks|
        |    mocks.patch_marshal_to_support_partial_doubles = true
        |  end
        |end
        |
        |Called from #{RSpec::CallerFilter.first_non_rspec_line}."
      EOS
    end
    dump_without_mocks(object.dup, *rest)
  end
end