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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Same problem here.
You may wanna learn the term "dependent pattern matching".
Because the case
a = zero,b = suc b'impliespf : zero ≡ suc (b + suc b)and this is automatically rejected.Why does the checker accepts an incomplete pattern matching (only the cases a = zero, b = zero and a = suc a', b = suc b') ?