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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.
This error is caused by your code, your code doesn't respect the original signature which is
fn find_all(sum_dig: u8, digs: u8) -> Option<(usize, u64, u64)>
. The testing function in attempt tests contains explicit types, so it cannot pass.