Use Parser.problem instead of Debug.todo

[ceddlyburge]

As per https://forum.exercism.org/t/debug-todo-in-paolas-prestigious-pizza/10596

I ran the existing code locally and it did reproduce the problem reported by Glenn.

I then used Parser.problem instead as suggested, and the test failure messages respond with something useful:

Tests
↓ PaolasPrestigiousPizza
↓ 7
✗ parse a pizza with no ingredients

    Err [{ col = 1, problem = Problem "Please implement this parser", row = 1 }]
    ╷
    │ Expect.equal
    ╵
    Ok { ingredients = [], name = "triste", price = 1, vegetarian = True }

[mpizenberg]

Sounds like a nice improvement indeed. Circumventing the usage of Debug.todo with function that do not have arguments and making the program crash. Good find!

[jiegillet]

Beautiful!