class RSpec::Mocks::VerifyingExistingMethodDouble

def initialize(object, method_name, proxy)
  super(object, method_name, proxy, self)
  @valid_method = object.respond_to?(method_name, true)
  # Trigger an eager find of the original method since if we find it any
  # later we end up getting a stubbed method with incorrect arity.
  save_original_method!
end