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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.
Haskell random test queries are way more liberal on whitespace than the grammar (whitespace at beggining/end of query, arbitrary whitespace instead of a single space after "SELECT", "FROM" etc.).
I would consider these bugs in the description rather than the test cases.
Description updated: both approaches are mentioned now.
In Test Cases random types are generated, and I don't know how to do it without
Proxy-s and existentials, so I cannot completely avoid usingProxy.This comment is hidden because it contains spoiler information about the solution