And that's a very implicit way of handling the error. Implicit behavior is good when you are encapsulating stuff (e.g: I don't need to know about the details of internal combustion engines, just pushing on the accelerator of my car so it moves forward).
But in this case encapsulation is a leaky abstraction that just makes the diagnosing of an error more cumbersome.
You don't have enough information to be outraged at the toy example.