"Why have failing examples?", you might ask.

They allow us to see failure messages. RSpec wants to provide meaningful and
helpful failure messages. The failures in this directory not only provide you
a way of seeing the failure messages, but they provide RSpec's own specs a way
of describing what they should look like and ensuring they stay correct.

To see the types of messages you can expect, stand in the root directory and
run:

bin/spec examples/failing/*.rb