class RSpec::Mocks::Matchers::Receive::DefaultDescribable

into full descriptions for `any_instance` expectations at this point :(.
user may want, but I'm not up for putting a bunch of effort
This is much simpler for the `any_instance` case than what the

def description_for(verb)
  "#{verb} #{@message}"
end

def initialize(message)
  @message = message
end