class RSpec::Mocks::MethodDouble

def restore_original_method
  return unless @method_is_proxied
  remove_method_from_definition_target
  @method_stasher.restore if @method_stasher.method_is_stashed?
  restore_original_visibility
  @method_is_proxied = false
rescue RuntimeError, TypeError => e
  # TODO: drop in favor of FrozenError in ruby 2.5+
  #  RuntimeError (and FrozenError) for ruby 2.x
  #  TypeError for ruby 1.x
  if (defined?(FrozenError) && e.is_a?(FrozenError)) || FROZEN_ERROR_MSG === e.message
    return show_frozen_warning
  end
  raise
end