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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.
Get started now by creating a new collection.
it's already reported as an issue: https://www.codewars.com/kata/5518a860a73e708c0a000027/discuss#5f06d49e39e006000fe14474
Agreed, although the laziness test definitely makes the kata more interesting and should be kept, it was a bit much for a 3 kyu
The Haskell (or some lazy languages) translation should be a separate 2 kyu problem. It is not fair as the same algorithm in other languages would have passed will get time out in Haskell, and to pass the test we need to dig deeper in the patterns than the other languages.
For a kyu 3 kata, I think it deserves a hint in the description. Or make it a kyu 2 and add the same kind of "advanced" tests to the other languages.