module ActiveSupport::MarshalWithAutoloading

def load(source, proc = nil)
  super(source, proc)
rescue ArgumentError, NameError => exc
  if exc.message.match(%r|undefined class/module (.+?)(?:::)?\z|)
    # try loading the class/module
    loaded = $1.constantize
    raise unless $1 == loaded.name
    # if it is an IO we need to go back to read the object
    source.rewind if source.respond_to?(:rewind)
    retry
  else
    raise exc
  end
end